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#1
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Kahn Symmetra-Peak
For whatever reason, I have been trying unsuccessfully to buy a Kahn
Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic change. |
#2
Posted to rec.audio.pro
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Kahn Symmetra-Peak
mcp6453 wrote:
For whatever reason, I have been trying unsuccessfully to buy a Kahn Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? What values do you need? Up to about a henry, you can get stuff just from Digi-Key. If you start needing really large stuff, places like MCE in California will sell onsie-twosie. Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic change. I don't. You know, there might actually be a market for a standalone phase rotator box these days. Maybe in a 500-series module. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#3
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On Feb 13, 11:05*pm, mcp6453 wrote:
For whatever reason, I have been trying unsuccessfully to buy a Kahn Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic change. you may want to consider a design that uses op-amps instead of inductors... http://www.w3am.com/8poleapf.html I'm curious, are you using this for an AM or FM radio application or for recording? Mark |
#4
Posted to rec.audio.pro
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Kahn Symmetra-Peak
mcp6453 put forth the notion
in...news:btGdnZzJM82NN8XQnZ2dnUVZ_sWdnZ2d@giganew s.com: For whatever reason, I have been trying unsuccessfully to buy a Kahn Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? Cinemag ? That's where I'd go. Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic change. Bump. david |
#5
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On 2/14/2011 9:39 AM, Scott Dorsey wrote:
mcp6453 wrote: For whatever reason, I have been trying unsuccessfully to buy a Kahn Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? What values do you need? Up to about a henry, you can get stuff just from Digi-Key. If you start needing really large stuff, places like MCE in California will sell onsie-twosie. Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic chain. I don't. You know, there might actually be a market for a standalone phase rotator box these days. Maybe in a 500-series module. Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? http://www.w3am.com/SymmetraPeakPatent.pdf To answer Mark, one of my hobbies is podcasting. Many voices are predominantly positive or predominantly negative in content. I have no idea how or why that is, but running through a phase rotator makes things nice and symmetrical. |
#6
Posted to rec.audio.pro
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Kahn Symmetra-Peak
mcp6453 wrote:
Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? Magnetic Circuit Elements in Monterey has 6 henry and 9.5 henry inductors off the shelf, as OC18CL43 and OC18CL44, probably under ten bucks. I'd go with the 6 henry and bump the cap value up a touch. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#7
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On 2/14/2011 2:30 PM, Scott Dorsey wrote:
mcp6453 wrote: Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? Magnetic Circuit Elements in Monterey has 6 henry and 9.5 henry inductors off the shelf, as OC18CL43 and OC18CL44, probably under ten bucks. I'd go with the 6 henry and bump the cap value up a touch. --scott Awesome. Thanks. |
#8
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On Mon, 14 Feb 2011 10:04:41 -0500, Mark wrote
(in article ): On Feb 13, 11:05*pm, mcp6453 wrote: For whatever reason, I have been trying unsuccessfully to buy a Kahn Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic change. you may want to consider a design that uses op-amps instead of inductors... http://www.w3am.com/8poleapf.html I'm curious, are you using this for an AM or FM radio application or for recording? Mark Get an Orban Optimod. It has a phase rotator that undoes what naturally occurs (asymmetrical peaks) and makes positive and negative peaks symmetrical. As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. Originally this was created to allow US radio stations to be louder, not better. Regards, Ty Ford --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
#9
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On Mon, 14 Feb 2011 14:05:30 -0500, mcp6453 wrote
(in article ) : To answer Mark, one of my hobbies is podcasting. Many voices are predominantly positive or predominantly negative in content. I have no idea how or why that is, but running through a phase rotator makes things nice and symmetrical. and unnatural. Regards, Ty Ford --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
#10
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Scott Dorsey wrote:
mcp6453 wrote: Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? Magnetic Circuit Elements in Monterey has 6 henry and 9.5 henry inductors off the shelf, as OC18CL43 and OC18CL44, probably under ten bucks. I'd go with the 6 henry and bump the cap value up a touch. --scott Dont know what the inductor value(s) are , but in my Quad ESL63s, the delay line involves 14 miles of wire, so they say ...! geoff |
#11
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On Feb 14, 2:05*pm, mcp6453 wrote:
On 2/14/2011 9:39 AM, Scott Dorsey wrote: mcp6453 wrote: For whatever reason, I have been trying unsuccessfully to buy a Kahn Symmetra-Peak for the last five years. Several have come and gone for about $150 each. It looks like I may have to build one. Since it's all passive components, it should be easy to build using point-to-point wiring. The problem is getting the inductors. A long time ago, there was a shop that would wind a low quantity of inductors for a reasonable price. I don't have a name. Does anyone have a suggestion? What values do you need? *Up to about a henry, you can get stuff just from Digi-Key. *If you start needing really large stuff, places like MCE in California will sell onsie-twosie. Alternatively, does anyone know of an outboard phase rotator? The Stardust VST plug-in does a good job even if I don't have all of the parameters set correctly, but I would love to have on in the mic chain. I don't. *You know, there might actually be a market for a standalone phase rotator box these days. *Maybe in a 500-series module. Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? http://www.w3am.com/SymmetraPeakPatent.pdf To answer Mark, one of my hobbies is podcasting. Many voices are predominantly positive or predominantly negative in content. I have no idea how or why that is, but running through a phase rotator makes things nice and symmetrical..- Hide quoted text - - Show quoted text - well there is no particular reason to use this for a pod casting appllication, you are not trying to overcome noise and static like AM radio... but if you really really want to do this anyway, an op-amp equivilant circuit can do the same thing Mark |
#12
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Ty Ford wrote:
As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... |
#13
Posted to rec.audio.pro
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Kahn Symmetra-Peak
In article ,
Bill Graham wrote: Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Sure it is, because the deflection of the vocal cords is NOT directly proportional to the air pressure. There can be compression peaks that are greater than rarification peaks, and the other way around. This is pretty much normal for everyone's voice. Since AM broadcast modulation is also asymmetric (you have a little more range on positive going peaks than negative one), phase rotation is critical there. Used to be the engineer would just give the announcer a figure-8 ribbon and tell him to use the front or the back depending on how his voice measured. These days we have fancy electronics to deal with it. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#14
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Kahn Symmetra-Peak
On Feb 15, 5:10*pm, "Bill Graham" wrote:
Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Bill, it is well known that most voices and many musical instruments have an assymetrical waveform...note that this means that the PEAKs are assymetrical. the area under the upper curve and the lower curve averaged over time are equal (by definition if the system is AC coupled) and that is probably what you are thinking about. This is/was a big deal for AM radio transmitters that are limted to 100% downward modulation but can go to 125% or more upward. But for pod casting the assymetry should make no difference, but it is there. Mark |
#15
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Scott Dorsey wrote:
In article , Bill Graham wrote: Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Sure it is, because the deflection of the vocal cords is NOT directly proportional to the air pressure. There can be compression peaks that are greater than rarification peaks, and the other way around. This is pretty much normal for everyone's voice. Since AM broadcast modulation is also asymmetric (you have a little more range on positive going peaks than negative one), phase rotation is critical there. Used to be the engineer would just give the announcer a figure-8 ribbon and tell him to use the front or the back depending on how his voice measured. These days we have fancy electronics to deal with it. --scott Oh. I always thought that vocal cords were kind of like guitar strings, so they would vibrate "up" just as far as "down". - That's why I like newsgroups....You learn something new almost every day.... |
#16
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Mark wrote:
On Feb 15, 5:10 pm, "Bill Graham" wrote: Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Bill, it is well known that most voices and many musical instruments have an assymetrical waveform...note that this means that the PEAKs are assymetrical. the area under the upper curve and the lower curve averaged over time are equal (by definition if the system is AC coupled) and that is probably what you are thinking about. This is/was a big deal for AM radio transmitters that are limted to 100% downward modulation but can go to 125% or more upward. But for pod casting the assymetry should make no difference, but it is there. Mark Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... |
#17
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Kahn Symmetra-Peak
geoff wrote:
Scott Dorsey wrote: mcp6453 wrote: Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? Magnetic Circuit Elements in Monterey has 6 henry and 9.5 henry inductors off the shelf, as OC18CL43 and OC18CL44, probably under ten bucks. I'd go with the 6 henry and bump the cap value up a touch. --scott Dont know what the inductor value(s) are , but in my Quad ESL63s, the delay line involves 14 miles of wire, so they say ...! geoff Curly cables forever! -- shut up and play your guitar * http://hankalrich.com/ http://armadillomusicproductions.com/who'slistening.html http://www.sonicbids.com/HankandShai...withDougHarman |
#18
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Scott Dorsey wrote:
In article , Bill Graham wrote: Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Sure it is, because the deflection of the vocal cords is NOT directly proportional to the air pressure. There can be compression peaks that are greater than rarification peaks, and the other way around. This is pretty much normal for everyone's voice. Since AM broadcast modulation is also asymmetric (you have a little more range on positive going peaks than negative one), phase rotation is critical there. Used to be the engineer would just give the announcer a figure-8 ribbon and tell him to use the front or the back depending on how his voice measured. These days we have fancy electronics to deal with it. --scott Tell ol' Bil he can't imagine... -- shut up and play your guitar * http://hankalrich.com/ http://armadillomusicproductions.com/who'slistening.html http://www.sonicbids.com/HankandShai...withDougHarman |
#19
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Mark wrote:
On Feb 15, 5:10 pm, "Bill Graham" wrote: Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Bill, it is well known that most voices and many musical instruments have an assymetrical waveform...note that this means that the PEAKs are assymetrical. the area under the upper curve and the lower curve averaged over time are equal (by definition if the system is AC coupled) and that is probably what you are thinking about. This is/was a big deal for AM radio transmitters that are limted to 100% downward modulation but can go to 125% or more upward. But for pod casting the assymetry should make no difference, but it is there. Mark The imagination of the of the engineer... One look at a couple dozen voices tracked into a DAW and bingo, data. -- shut up and play your guitar * http://hankalrich.com/ http://armadillomusicproductions.com/who'slistening.html http://www.sonicbids.com/HankandShai...withDougHarman |
#20
Posted to rec.audio.pro
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Kahn Symmetra-Peak
On 2/14/2011 2:30 PM, Scott Dorsey wrote:
mcp6453 wrote: Here's all I know about the innards of a Kahn Symmetra-Peak. Unfortunately the inductors are 7H. The caps are 0.03uF, according to the patent. It would be a trivial circuit to build, but I'd rather just buy one. My bet is that a 7H inductor is quite pricey these days. Plus, I don't know the specs on the ones Leonard used. That information should be available, though. Did the Symmetra Peak ship with a technical manual? Magnetic Circuit Elements in Monterey has 6 henry and 9.5 henry inductors off the shelf, as OC18CL43 and OC18CL44, probably under ten bucks. I'd go with the 6 henry and bump the cap value up a touch. --scott The inductors are just under $5 each. Not bad. I asked them if they could wind the OC18CL43 to 7H instead of 6H, and they said, "The OC18CL43 has laminations with an air gap to handle a DC. The inductance decreases due to the lamination core; however, the impedance continues to increase. I am not sure that increasing the inductance to 7000 mH will make much difference because of the large distributive capacitance of the winding." I sort of understand what he's saying. However, couldn't they leave some windings off the 9.5H version? |
#21
Posted to rec.audio.pro
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Kahn Symmetra-Peak
Bill Graham wrote:
Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#22
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Kahn Symmetra-Peak
Scott Dorsey wrote:
Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. --scott I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. I think this area represents the energy created by the device, whether voice or instrument. And, I don't know what this means in terms of the sound as it reaches the ear. |
#23
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Kahn Symmetra-Peak
"Mark" wrote in message
On Feb 15, 5:10 pm, "Bill Graham" wrote: Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Bill, it is well known that most voices and many musical instruments have an assymetrical waveform...note that this means that the PEAKs are assymetrical. the area under the upper curve and the lower curve averaged over time are equal (by definition if the system is AC coupled) and that is probably what you are thinking about. This is/was a big deal for AM radio transmitters that are limted to 100% downward modulation but can go to 125% or more upward. But for pod casting the assymetry should make no difference, but it is there. I'm not so sure about that. Many users of digital players report difficulties getting adequate loudness for listening in noisy locations, even with IEMs. The maximum output of portable digital players appears to be tightly regulated in the EU, for example. When I make voice recordings for download, I normalize them to 90%. If I had requests for louder recordings I would consider dynamics processing and probably use an all-pass fiilter to make the recordings more symmetrical. But, the all-pass filter I would use would be electronic (IOW ICs not big inductors) or implemented in the digital domain because it can be done there very effectively inexpensively and with minimal other artifacts. |
#24
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Kahn Symmetra-Peak
On 2/16/2011 8:21 AM, Arny Krueger wrote:
I'm not so sure about that. Many users of digital players report difficulties getting adequate loudness for listening in noisy locations, even with IEMs. The maximum output of portable digital players appears to be tightly regulated in the EU, for example. When I make voice recordings for download, I normalize them to 90%. If I had requests for louder recordings I would consider dynamics processing and probably use an all-pass fiilter to make the recordings more symmetrical. But, the all-pass filter I would use would be electronic (IOW ICs not big inductors) or implemented in the digital domain because it can be done there very effectively inexpensively and with minimal other artifacts. How would you do it in the digital domain? I use a VST plug-in in Adobe Audition called Stardust, but I guessed at the settings. If it works, it works, but it would be good to have a clue what I'm really doing. |
#25
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Kahn Symmetra-Peak
Bill Graham wrote:
Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. --scott I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. -- shut up and play your guitar * http://hankalrich.com/ http://armadillomusicproductions.com/who'slistening.html http://www.sonicbids.com/HankandShai...withDougHarman |
#26
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Kahn Symmetra-Peak
In article ,
hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#27
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Kahn Symmetra-Peak
Scott Dorsey wrote:
In article , hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. --scott We engineers usually start everything with a, "suspicion", which is always subject to verification for what is important. This is the stuff of invention. Without it, the world would be a very dull and uninteresting place, in spite of vast technical knowledge. |
#28
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Kahn Symmetra-Peak
On Tue, 15 Feb 2011 17:10:10 -0500, Bill Graham wrote
(in article ) : Ty Ford wrote: As a side note, I know my voice has larger negative peaks than positive peaks. If I'm looking at a wave form, I can tell if there's a polarity flip somewhere. My guess is that you have drawn the "average" line too high. I can't imagine why your voice, or any other instrument would have greater negative peaks than positive ones. That's not physically possible, IMO..... Bill, Regardless of your imagination, that's the way it is. Regards, Ty Ford --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
#29
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Kahn Symmetra-Peak
On Wed, 16 Feb 2011 13:13:48 -0500, hank alrich wrote
(in article ): Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. --scott I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. +1 Ty Ford --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
#30
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Kahn Symmetra-Peak
On Wed, 16 Feb 2011 15:45:58 -0500, Bill Graham wrote
(in article ): Scott Dorsey wrote: In article , hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. --scott We engineers usually start everything with a, "suspicion", which is always subject to verification for what is important. This is the stuff of invention. Without it, the world would be a very dull and uninteresting place, in spite of vast technical knowledge. WE? --Audio Equipment Reviews Audio Production Services Acting and Voiceover Demos http://www.tyford.com Guitar player?:http://www.youtube.com/watch?v=yWaPRHMGhGA |
#31
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Kahn Symmetra-Peak
Ty Ford wrote:
On Wed, 16 Feb 2011 15:45:58 -0500, Bill Graham wrote (in article ): Scott Dorsey wrote: In article , hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. --scott We engineers usually start everything with a, "suspicion", which is always subject to verification for what is important. This is the stuff of invention. Without it, the world would be a very dull and uninteresting place, in spite of vast technical knowledge. WE? Some of us aren't talking about inventing stuff, we're talking about the reality of vocal and other waverforms. He doesn't get that he is not an audio engineer, obviously. -- shut up and play your guitar * http://hankalrich.com/ http://armadillomusicproductions.com/who'slistening.html http://www.sonicbids.com/HankandShai...withDougHarman |
#32
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Kahn Symmetra-Peak
Bill Graham wrote:
Scott Dorsey wrote: Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. --scott I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. I think this area represents the energy created by the device, whether voice or instrument. And, I don't know what this means in terms of the sound as it reaches the ear. Read up on what equal harmonics, especially second, do to the curve-shape. As for vox humana it appears that most people tend to be positive, but even those do have some wovels that are negative. Interestingly positive sounds slightly sharp while negative sounds slightly flat. Listening for the audibility of acoustic polarity can be great fun, especially if it is a multitrack mix with mixed polarity, but do be aware that second harmonic distortion from the playback system tends to act as a detection bias. Recordings made with DPA4006 seem to me to be less asymmetric than many other recordings, so do not jump to the conclusion that an observed asymmetry correlates with an actual one. Also multiband processing can change the observed/audible asymmetry. Audio tends to be unsimple once you scratch the black paint off with a key, mostly however it may be the gear pushers that end up with the stuff dreams are made of. Kind regards Peter Larsen |
#33
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Kahn Symmetra-Peak
Ty Ford wrote:
On Wed, 16 Feb 2011 15:45:58 -0500, Bill Graham wrote (in article ): Scott Dorsey wrote: In article , hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. --scott We engineers usually start everything with a, "suspicion", which is always subject to verification for what is important. This is the stuff of invention. Without it, the world would be a very dull and uninteresting place, in spite of vast technical knowledge. WE? We good ones. |
#34
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Kahn Symmetra-Peak
Peter Larsen wrote:
Bill Graham wrote: Scott Dorsey wrote: Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. --scott I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. I think this area represents the energy created by the device, whether voice or instrument. And, I don't know what this means in terms of the sound as it reaches the ear. Read up on what equal harmonics, especially second, do to the curve-shape. As for vox humana it appears that most people tend to be positive, but even those do have some wovels that are negative. Interestingly positive sounds slightly sharp while negative sounds slightly flat. Listening for the audibility of acoustic polarity can be great fun, especially if it is a multitrack mix with mixed polarity, but do be aware that second harmonic distortion from the playback system tends to act as a detection bias. Recordings made with DPA4006 seem to me to be less asymmetric than many other recordings, so do not jump to the conclusion that an observed asymmetry correlates with an actual one. Also multiband processing can change the observed/audible asymmetry. Audio tends to be unsimple once you scratch the black paint off with a key, mostly however it may be the gear pushers that end up with the stuff dreams are made of. Kind regards Peter Larsen It should be possible to electronically "clip" or remove either the positive or negative part of the waveform before it readches the speaker. As a matter of fact, you could probably copy the previous positive half of the wave and reverse it and patch it into the imediately following half cycle, so the complete wave was rebuilt with perfect symmetry......I wonder if anyone has done this? |
#35
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Kahn Symmetra-Peak
Bill Graham wrote:
It should be possible to electronically "clip" or remove either the positive or negative part of the waveform before it readches the speaker. As a matter of fact, you could probably copy the previous positive half of the wave and reverse it and patch it into the imediately following half cycle, so the complete wave was rebuilt with perfect symmetry......I wonder if anyone has done this? Yes, that's why I mentioned three messages ago in this thread that you can limit the hell out of a trumpet waveform without changing the tonality much. However, if you were to make it symmetric, it wouldn't sound like a trumpet any more. --Scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#36
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Kahn Symmetra-Peak
Scott Dorsey wrote:
Bill Graham wrote: It should be possible to electronically "clip" or remove either the positive or negative part of the waveform before it readches the speaker. As a matter of fact, you could probably copy the previous positive half of the wave and reverse it and patch it into the imediately following half cycle, so the complete wave was rebuilt with perfect symmetry......I wonder if anyone has done this? Yes, that's why I mentioned three messages ago in this thread that you can limit the hell out of a trumpet waveform without changing the tonality much. However, if you were to make it symmetric, it wouldn't sound like a trumpet any more. --Scott Maybe that's why electronically created trumpet sounds are so poor at replicating a real trumpet. It may be that they are symmetrical......Of all the sounds that eminate from synthesizers, the trumpet ones are the least like a real trumpet. |
#37
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Kahn Symmetra-Peak
"Scott Dorsey" wrote in message
In article , hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. Thing is that a velocity microphone like a cardioid is by definition a high pass filter with zero gain at DC. But, forget about the mic, the mic preamp is AC coupled. So, the following must always be true no matter what the microphone: Without DC coupling and with reasonable linearity, the integral of the voltage in the recording above zero *must* be equal to the integral of the voltage below zero. Or as Bill correctly said: "...while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same." A tragic example of an attempt by a mob to mis-define technical truth by political means. Bill is unpopular with some people, so an apparent error is created out of a true thing that he said. Sad. :-( |
#38
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Kahn Symmetra-Peak
"mcp6453" wrote in message
On 2/16/2011 8:21 AM, Arny Krueger wrote: I'm not so sure about that. Many users of digital players report difficulties getting adequate loudness for listening in noisy locations, even with IEMs. The maximum output of portable digital players appears to be tightly regulated in the EU, for example. When I make voice recordings for download, I normalize them to 90%. If I had requests for louder recordings I would consider dynamics processing and probably use an all-pass fiilter to make the recordings more symmetrical. But, the all-pass filter I would use would be electronic (IOW ICs not big inductors) or implemented in the digital domain because it can be done there very effectively inexpensively and with minimal other artifacts. How would you do it in the digital domain? I use a VST plug-in in Adobe Audition called Stardust, but I guessed at the settings. If it works, it works, but it would be good to have a clue what I'm really doing. My first experiment would involve the "Graphic Phase Shifter". It is in CEP 2.1, so I presume that its in Audition since Auditon is so heavily based on CEP. My first test curve would be 360 degrees of positive phase shift up to say 400 Hz, and then -360 degrees after that. Tune for minimum phase shift consistent with the desired effect. I looked at a number my own recordings wondering why I had never investigated this option, and I found that for whatever reason, the recordings that I post on the web are *always* very symmetrical from the get-go. I'm guessing that the highly reverberent space might be the reason why. |
#39
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Kahn Symmetra-Peak
Arny Krueger wrote:
Thing is that a velocity microphone like a cardioid is by definition a high pass filter with zero gain at DC. A cardioid, though, isn't a velocity microphone. It's also not a pressure microphone. It's something different. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#40
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Kahn Symmetra-Peak
Arny Krueger wrote:
"Scott Dorsey" wrote in message In article , hank alrich wrote: Bill Graham wrote: Scott Dorsey wrote: Bill Graham wrote: Yes. - I wonder if my horn can do something like this....There are many different sounds that some people can get out of it. I will have to think about it for a while..... Yup. Trumpet is one of the most asymmetric waveforms there is, with positive-going peaks that are enormous compared with the negative-going ones. Correspondingly you can use aggressive limiting on trumpet without changing the tone all that much. I have a suspicion that while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same. For an "engineer" you are remarkably prone to guessing, and guessing wrong. Again, put the music into a DAW and take a look. If the wave were directly measuring air pressure, it would have to be that way because the total pressure has to be the same before and after the note. The thing is... what a cardioid microphone measures isn't direct air pressure or anything much like it. Thing is that a velocity microphone like a cardioid is by definition a high pass filter with zero gain at DC. But, forget about the mic, the mic preamp is AC coupled. So, the following must always be true no matter what the microphone: Without DC coupling and with reasonable linearity, the integral of the voltage in the recording above zero *must* be equal to the integral of the voltage below zero. Or as Bill correctly said: "...while the positive part of the wave might not look like the negative part, the area between the two curves and the base line should be the same." A tragic example of an attempt by a mob to mis-define technical truth by political means. Bill is unpopular with some people, so an apparent error is created out of a true thing that he said. Sad. :-( Well, another way to look at it, is where would you draw the baseline given any random audio waveform? You could put it halfway between the peaks, or at the average voltage point, or where the areas below it and above it are equal. I believe a scope puts it, defacto, at the average voltage point, since you set it yourself based on no voltage input at all, and the scope deflects it up or down based on voltage input. |
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