Home |
Search |
Today's Posts |
#1
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
I understand that I can get white noise by amplifying the noise of a Zenor diode at it's "knee" point... Is this a good quality white noise? How can I filter it into pink noise? Thanks! |
#2
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
wrote:
I understand that I can get white noise by amplifying the noise of a Zenor diode at it's "knee" point... Is this a good quality white noise? It's OK, you'll want to buffer the Zener with an amp stage or two, http://www.maxim-ic.com/app-notes/index.mvp/id/3469 How can I filter it into pink noise? -3dB/octave, http://sound.westhost.com/project11.htm I have a Heathkit AD-1309 noise generator, both white and pink with a level control. |
#3
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
Audio1 wrote:
wrote: I understand that I can get white noise by amplifying the noise of a Zenor diode at it's "knee" point... Is this a good quality white noise? It's OK, you'll want to buffer the Zener with an amp stage or two, http://www.maxim-ic.com/app-notes/index.mvp/id/3469 How can I filter it into pink noise? -3dB/octave, http://sound.westhost.com/project11.htm I have a Heathkit AD-1309 noise generator, both white and pink with a level control. Easiest to downlaoid a WAV and make a CD of it. geoff |
#4
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
On Thu, 18 Feb 2010 15:33:37 +1300, "geoff"
wrote: Audio1 wrote: wrote: I understand that I can get white noise by amplifying the noise of a Zenor diode at it's "knee" point... Is this a good quality white noise? It's OK, you'll want to buffer the Zener with an amp stage or two, http://www.maxim-ic.com/app-notes/index.mvp/id/3469 How can I filter it into pink noise? -3dB/octave, http://sound.westhost.com/project11.htm I have a Heathkit AD-1309 noise generator, both white and pink with a level control. Easiest to downlaoid a WAV and make a CD of it. Or play it right out of the computer sound card as a signal generator. -- John |
#5
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
wrote in message
I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. For the past 40 years, anybody who was serious about generating a noise signal for audio did it digitally. The basic technology involves a clocked shift register, if memory serves. Dedicated chips with this purpose were once hot items for serious auido experimenters. Is this a good quality white noise? Back in the day I experimented with analog noise generators, and long story short, I quickly shifted to digital approaches. Today, you either generate the noise with software you already have (DAW) or download a .wav file of the noise of your choice from the web. I think Goldwave (shareware/freeware) generates pink, white, and red or brown noise. How can I filter it into pink noise? In the day, we used analog pinking filters schematics of which are probably still rattling around the web. |
#6
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
wrote:
I understand that I can get white noise by amplifying the noise of a Zenor diode at it's "knee" point... Is this a good quality white noise? Depends what you mean by good quality. It's very random. The distribution is pretty white. It goes pretty far into the RF range. How can I filter it into pink noise? 1/f integrator stage. Here's an example: http://sound.westhost.com/project11.htm --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#7
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
Here's mine:
http://www.ethanwiner.com/spectrum.html The digital circuit in Figure 2 creates a very pure white noise, which is then filtered to pink. Here's a 14-second Wave file that can be looped seamlessly to any length: http://www.ethanwiner.com/misc-conten/pinknoise.wav --Ethan |
#8
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
|
#9
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
In article , Ethan Winer wrote:
Oops, this link works: http://www.ethanwiner.com/misc-content/pinknoise.wav A circuit probably similar to the one Old Colony sold. One neat trick was it could be set to stereo or mono. greg |
#10
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
On Thu, 18 Feb 2010 08:08:45 -0500, "Arny Krueger" wrote:
wrote in message I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... For the past 40 years, anybody who was serious about generating a noise signal for audio did it digitally. The basic technology involves a clocked shift register, if memory serves. Dedicated chips with this purpose were once hot items for serious auido experimenters. You are implying that I am not serious? I know about digital noise generators, (pseudo random sequencers), they are a lot more complicated than a zenor, resistor, and cap... Is this a good quality white noise? Back in the day I experimented with analog noise generators, and long story short, I quickly shifted to digital approaches. Today, you either generate the noise with software you already have (DAW) or download a .wav file of the noise of your choice from the web. I think Goldwave (shareware/freeware) generates pink, white, and red or brown noise. Actually that's probably the best way, I'll make a CDR. How can I filter it into pink noise? In the day, we used analog pinking filters schematics of which are probably still rattling around the web. Pinking filter eh? Sounds distinctly communist! |
#11
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
|
#12
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
"Don Pearce" wrote in message
On Thu, 18 Feb 2010 15:58:40 -0500, wrote: If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... Dunno about a vacuum tube noise generator, but a neon tube does the job very well. http://mysite.du.edu/~etuttle/electr...ct27.htm#Noise " The Noise Diode A special kind of diode should be mentioned here, because experiments with it are quite interesting. It is the noise diode, intended for the specific purpose of producing wide-band RF noise through the shot effect. Shot effect noise is fluctuations in the anode current due to the random collection of electrons. We have already mentioned that the anode current is controlled by the space charge around the filament. It was discovered, to some surprise, that this correlated successive electrons so that they were emitted regularly to maintain a constant current, and therefore the shot effect was nearly completely eliminated. That is, a normal diode has no shot effect noise in its plate current. The noise diode is designed so that at reasonable plate voltages, all electrons emitted by the filament are immediately drawn to the plate without forming much of a space charge. Since the electrons are emitted randomly, the anode current will show the full shot effect noise. This is done by purposely making the filament to have low emission. To do this, a tungsten filament is used. Noise diodes give us the opportunity to observe a tungsten filament, as well as temperature saturation. An available noise diode is the 5722, whose basing is shown at the right. The 7-pin miniature tube was made as late as 1977, and now costs about $14, which is probably not much more than when it was new. The maximum plate voltage is given as 200 V, and the maximum plate current as 35 mA, so apparently the plate can dissipate 7 W. The plate has wings that make a good dissipation probable. " My recollection is that while the primary purpose of this device was the production of RF noise, its output in the audio band was sometimes used, back in the days of tubes. |
#13
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
wrote in message
On Thu, 18 Feb 2010 08:08:45 -0500, "Arny Krueger" wrote: wrote in message I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... For the past 40 years, anybody who was serious about generating a noise signal for audio did it digitally. The basic technology involves a clocked shift register, if memory serves. Dedicated chips with this purpose were once hot items for serious auido experimenters. You are implying that I am not serious? You are the best judge of that. I know about digital noise generators, (pseudo random sequencers), they are a lot more complicated than a zenor, resistor, and cap... The above 3 parts were replaced by 1 chip with 4 terminal connections: http://www.datasheetcatalog.org/data.../455558_DS.pdf Is this a good quality white noise? Back in the day I experimented with analog noise generators, and long story short, I quickly shifted to digital approaches. What I'm saying is that I tried the zener noise source approach, and quickly moved on. Today, you either generate the noise with software you already have (DAW) or download a .wav file of the noise of your choice from the web. I think Goldwave (shareware/freeware) generates pink, white, and red or brown noise. Actually that's probably the best way, I'll make a CDR. There you go! Good move. How can I filter it into pink noise? In the day, we used analog pinking filters schematics of which are probably still rattling around the web. Pinking filter eh? Sounds distinctly communist! During the Cold War we used the phrase with nary a tinge: http://www.firstpr.com.au/dsp/pink-noise/ |
#14
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
In article ,
On Thu, 18 Feb 2010 08:08:45 -0500, "Arny Krueger" wrote: wrote in message m I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... No, he's talking about a noise tube. It's some sort of goofy diode that is placed in an external magnetic field. The GenRad noise sources and noise bridges used them. I don't think they have any actual advantage over a zener other than looking cool. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#15
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
"Scott Dorsey" wrote in message
In article , On Thu, 18 Feb 2010 08:08:45 -0500, "Arny Krueger" wrote: wrote in message I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... No, he's talking about a noise tube. It's some sort of goofy diode that is placed in an external magnetic field. The GenRad noise sources and noise bridges used them. I don't think they have any actual advantage over a zener other than looking cool. --scott AFAIK the major advantage of noise diode tubes over zeners is that the tubes rather significantly pre-existed the zeners. ;-) |
#16
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
On Thu, 18 Feb 2010 17:03:27 -0500, "Arny Krueger" wrote:
wrote in message On Thu, 18 Feb 2010 08:08:45 -0500, "Arny Krueger" wrote: wrote in message I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... For the past 40 years, anybody who was serious about generating a noise signal for audio did it digitally. The basic technology involves a clocked shift register, if memory serves. Dedicated chips with this purpose were once hot items for serious auido experimenters. You are implying that I am not serious? You are the best judge of that. I know about digital noise generators, (pseudo random sequencers), they are a lot more complicated than a zenor, resistor, and cap... The above 3 parts were replaced by 1 chip with 4 terminal connections: http://www.datasheetcatalog.org/data.../455558_DS.pdf Actually, thats a white noise gen, and would require a pinking filter... Is this a good quality white noise? Back in the day I experimented with analog noise generators, and long story short, I quickly shifted to digital approaches. What I'm saying is that I tried the zener noise source approach, and quickly moved on. Today, you either generate the noise with software you already have (DAW) or download a .wav file of the noise of your choice from the web. I think Goldwave (shareware/freeware) generates pink, white, and red or brown noise. Actually that's probably the best way, I'll make a CDR. I never looked before, but my sound editor has a pink noise sim... I should open my eyes, eh? There you go! Good move. How can I filter it into pink noise? In the day, we used analog pinking filters schematics of which are probably still rattling around the web. Pinking filter eh? Sounds distinctly communist! During the Cold War we used the phrase with nary a tinge: http://www.firstpr.com.au/dsp/pink-noise/ |
#17
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
On Thu, 18 Feb 2010 18:41:08 -0500, "Arny Krueger" wrote:
"Scott Dorsey" wrote in message In article , On Thu, 18 Feb 2010 08:08:45 -0500, "Arny Krueger" wrote: wrote in message I understand that I can get white noise by amplifying the noise of a Zener diode at it's "knee" point... If you really want to go for retro technology, why not use a vacuum tube noise generator. I think it was some kind of a diode. Really? You must be channeling Edison... A vacuum tube is not a solid state zenor, which is known as a reliable noise generator. Perhaps you could Google it and read up on that... No, he's talking about a noise tube. It's some sort of goofy diode that is placed in an external magnetic field. The GenRad noise sources and noise bridges used them. I don't think they have any actual advantage over a zener other than looking cool. --scott AFAIK the major advantage of noise diode tubes over zeners is that the tubes rather significantly pre-existed the zeners. ;-) Pre-dating is not an advantage... especially with a wasteful tube! Small and cold is why technology marches forward! In practical terms, I have a box of various zeners and weirdo diodes... some exhibiting reverse resistance and such anomalies... but the only tubes I have are guitar amp types, and probably a box of old TV tubes in the basement... no noise diode tubes... Imagine the hassle of setting one of those up! But computer sims seem to be the best bet! |
#18
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
How can I filter it into pink noise? See http://en.wikipedia.org/wiki/Colors_of_noise for details of how to filter white to pink noise. Chris- http://multitrackmixers.com/ http://djsetup.net/ |
#19
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
wrote:
In practical terms, I have a box of various zeners and weirdo diodes... some exhibiting reverse resistance and such anomalies... but the only tubes I have are guitar amp types, and probably a box of old TV tubes in the basement... no noise diode tubes... Imagine the hassle of setting one of those up! It's not so bad, I just had a Gen-Rad on the bench not too long ago. But you could readily use any gas-filled tube, I think. Even a cold cathode backlight from a laptop.... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#21
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
David
Would you be willing to sell your gsc 901b ? Thanks |
#22
Posted to rec.audio.pro
|
|||
|
|||
white and pink noise
I wonder if he wants the quote in 2010 dollars or 2015?
Mark |
Reply |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
White or Pink? | Vacuum Tubes | |||
white noise distortion on guitar | Pro Audio | |||
white noise distortion on guitar | Pro Audio | |||
Looking for white noise or crahing surf CD | General | |||
White noise problem in Cubase SX | Pro Audio |