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#1
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Tape Speed Correction Software
I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them
was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. |
#2
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Tape Speed Correction Software
On Sun, 19 Oct 2014 12:00:11 -0400, mcp6453 wrote:
I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. There is pitch correction software out there that can do a really good job. It uses residual 50/60Hz hum in the recording as its reference and applies the correction needed to bring that back to frequency. I can't remember its name, but it is worth a search. d |
#3
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Tape Speed Correction Software
mcp6453 wrote:
I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. What is the problem and over what range of speed changes is it? Is it a recorder with slowly dying batteries where the speed is ramping down slowly, or a recorder with a bad pinch roller where the tape is alternately sticking and letting go, or a recorder where the pinch roller has not engaged at al and so the speed is wild and random and mostly very high? Is there by any chance a constant tone that could be used as a reference? Like a 60 Hz hum? Is the job to make music sound good, or to get intelligible voices? Somehow I am thinking of Jamie Howarth at Plangent... he has never done anything like this but maybe he'd like to try. The low running speed of the cassette makes it much harder than with normal tape. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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Tape Speed Correction Software
Scott Dorsey wrote:
mcp6453 wrote: I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. What is the problem and over what range of speed changes is it? Is it a recorder with slowly dying batteries where the speed is ramping down slowly, or a recorder with a bad pinch roller where the tape is alternately sticking and letting go, or a recorder where the pinch roller has not engaged at al and so the speed is wild and random and mostly very high? Is there by any chance a constant tone that could be used as a reference? Like a 60 Hz hum? Is the job to make music sound good, or to get intelligible voices? Somehow I am thinking of Jamie Howarth at Plangent... he has never done anything like this but maybe he'd like to try. The low running speed of the cassette makes it much harder than with normal tape. --scott I recently saw mention of a plugin, from a different source, that pruported to do this, too. Will see if I can recall where I got that bit. -- shut up and play your guitar * HankAlrich.Com HankandShaidriMusic.Com YouTube.Com/WalkinayMusic |
#5
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Tape Speed Correction Software
On 10/19/2014 1:57 PM, Jeff Henig wrote:
hank alrich wrote: Scott Dorsey wrote: mcp6453 wrote: I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. What is the problem and over what range of speed changes is it? Is it a recorder with slowly dying batteries where the speed is ramping down slowly, or a recorder with a bad pinch roller where the tape is alternately sticking and letting go, or a recorder where the pinch roller has not engaged at al and so the speed is wild and random and mostly very high? Is there by any chance a constant tone that could be used as a reference? Like a 60 Hz hum? Is the job to make music sound good, or to get intelligible voices? Somehow I am thinking of Jamie Howarth at Plangent... he has never done anything like this but maybe he'd like to try. The low running speed of the cassette makes it much harder than with normal tape. --scott I recently saw mention of a plugin, from a different source, that pruported to do this, too. Will see if I can recall where I got that bit. Is this the kind of thing to which you are referring? https://www.izotope.com/en/products/...r/rx/features/ It looks like "Time & Pitch" may be the function that's needed, but it's part of the $1200 package. It's all voice. The objective is to cause the voices to be as close to normal as possible. The pitch varies quite a bit. I don't know what the problem with the deck was. It cleared up by the end of one tape. The machine was dragging while it was recording. There's probably 60 Hz in there somewhere. |
#6
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Tape Speed Correction Software
On 10/19/2014 9:00 AM, mcp6453 wrote:
I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? No magic bullets for this. Since the recordings are personally valuable to you, you should just be patient and take the time to work through them section by section. Once you start looking and listening closely, you'll probably get a better idea of what's happening (it may not be completely random) and it'll go faster as you gain experience. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#7
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Tape Speed Correction Software
"mcp6453" skrev i en meddelelse
... I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. Hum is your saviour, Audition can probably fix it if you divide it in segments, it can do alter the speed with a linear variation, if in segments it is likely to be close enough and there is almost always hum enough on an analog tape recording for the speed variations to be documented. Use FFT analysis to determine the hum frequency on the tape and adjust speed until it gets correct. You have to do it to apply any kind of EQ or notch filtering anyway. I would prefer to sample at 96 kHz for such drastic work and then probably downsample to 48 or 44.1 for general fixitology when the speed issues are fixed. Kind regards Peter Larsen |
#8
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Tape Speed Correction Software
"Mike Rivers" skrev i en meddelelse
... On 10/19/2014 9:00 AM, mcp6453 wrote: I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? No magic bullets for this. Not correct as long as it is recorder drift we are talking of, it is trivial but possibly tedious and AA1.5 will do all that is needed out of the shrinkwrap. Kind regards Peter Larsen |
#9
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Tape Speed Correction Software
mcp6453 wrote:
It looks like "Time & Pitch" may be the function that's needed, but it's part of the $1200 package. It's all voice. The objective is to cause the voices to be as close to normal as possible. The pitch varies quite a bit. I don't know what the problem with the deck was. It cleared up by the end of one tape. The machine was dragging while it was recording. There's probably 60 Hz in there somewhere. If there is 60 Hz, you can lock to it with resolver software and get the speed pretty constant. You might ask Wes Dooley; he certainly has the software for the job as well as the skills. He'll charge something but I doubt it'll be anything like $1200. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#10
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Tape Speed Correction Software
On Sun, 19 Oct 2014 12:00:11 -0400, mcp6453 wrote:
I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. The software you are looking for is called "Capstan" by Celemony. http://www.celemony.com/en/capstan I used it on some solo piano work that had been recorded on a Tascam with severe wow and flutter problems and it cleaned up 90 percent or more of it in "fix it all" mode. The difference between source and repaired was like night and day. Worth looking into. It doesn't run under Linux BTW. Just thought I would mention that -- flatfish+++ Linux: The Operating System That Put The City Of Munich Out Of Business. Before Switching To Linux Read This: http://linuxfonts.narod.ru/why.linux...current.htm l |
#11
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Tape Speed Correction Software
On 10/20/2014 8:37 AM, Peter Larsen wrote:
Not correct as long as it is recorder drift we are talking of, it is trivial but possibly tedious and AA1.5 will do all that is needed out of the shrinkwrap. By "no magic bullet" I meant that there wasn't a one-click solution. You need to find a section that's off speed and put it back on speed. If it's constantly drifting, you'll need to do it in small chunks. Tedious indeed. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
#12
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Tape Speed Correction Software
On 10/20/2014 7:54 PM, flatfish+++ wrote:
On Sun, 19 Oct 2014 12:00:11 -0400, mcp6453 wrote: I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. The software you are looking for is called "Capstan" by Celemony. http://www.celemony.com/en/capstan I used it on some solo piano work that had been recorded on a Tascam with severe wow and flutter problems and it cleaned up 90 percent or more of it in "fix it all" mode. The difference between source and repaired was like night and day. Worth looking into. It doesn't run under Linux BTW. Just thought I would mention that It's $4,458. That's a little much. Do you have it? |
#13
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Tape Speed Correction Software
"Mike Rivers" skrev i en meddelelse
... On 10/20/2014 8:37 AM, Peter Larsen wrote: Not correct as long as it is recorder drift we are talking of, it is trivial but possibly tedious and AA1.5 will do all that is needed out of the shrinkwrap. By "no magic bullet" I meant that there wasn't a one-click solution. You need to find a section that's off speed and put it back on speed. If it's constantly drifting, you'll need to do it in small chunks. Mike I have have done this with several analog tapes, it is my default procedure to check for speed variations, usually they are reasonably linear over a reel and AA allows a gliding stretch. So I tend to end up with 1 to 3 chunks for a reel, often just the entire reel. AA in various incarnations has a linearly changing stretch and the standard variation of a reel to reel is close enough to linear to make the audio fit well into narrow notch filters. Such tend to always be relevant. Tedious indeed. Yes, but not that bad once the workflow for a given tape has been learned. Here is an short example from a meeting recorded in 1956, speech only, I think this is the general type of audio asked about by the OP: http://www.muyiovatki.dk/alarsen/mp3...0_baand-id.mp3 It is a recording of a meeting in 1956 serially copied for listening to at local meetings, probably of the pulpit microphone, not the original tape and I do not know how many generations there was on the way to the digitized copy. It also illustrates the limitations of DIY recovery ... Kind regards Peter Larsen |
#14
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Tape Speed Correction Software
flatfish+++ wrote:
The software you are looking for is called "Capstan" by Celemony. Thank you. That's the one I was tryng to remember. Saw it while looking at other stuff at their site. -- shut up and play your guitar * HankAlrich.Com HankandShaidriMusic.Com YouTube.Com/WalkinayMusic |
#15
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Tape Speed Correction Software
"mcp6453" wrote in message
news On 10/20/2014 7:54 PM, flatfish+++ wrote: On Sun, 19 Oct 2014 12:00:11 -0400, mcp6453 wrote: I discovered some extremely (personally) valuable cassette tapes from 1982. Unfortunately, the recorder on some of them was running erratically. Is there any software available that will do anything credible towards removing the speed/pitch variations? Adobe Audition 1.5 has some pitch correction functionality that appears to be dynamic, but the variations are quite extreme. Thankfully not all tapes are totally bad. The software you are looking for is called "Capstan" by Celemony. http://www.celemony.com/en/capstan I used it on some solo piano work that had been recorded on a Tascam with severe wow and flutter problems and it cleaned up 90 percent or more of it in "fix it all" mode. The difference between source and repaired was like night and day. Worth looking into. It doesn't run under Linux BTW. Just thought I would mention that It's $4,458. That's a little much. Do you have it? There is a 'rental' version - 1 week for $200. Still not cheap but for audio with personal value (say tapes from a deceased family member) it's a bargain. Sean |
#16
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Tape Speed Correction Software
On 10/22/2014 9:40 AM, Sean Conolly wrote:
The software you are looking for is called "Capstan" by Celemony. There is a 'rental' version - 1 week for $200. Still not cheap but for audio with personal value (say tapes from a deceased family member) it's a bargain. Better plan on two weeks, one to use it and one to figure out how to use it. -- For a good time, visit http://mikeriversaudio.wordpress.com |
#17
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Tape Speed Correction Software
"Mike Rivers" skrev i en meddelelse
... On 10/22/2014 9:40 AM, Sean Conolly wrote: The software you are looking for is called "Capstan" by Celemony. There is a 'rental' version - 1 week for $200. Still not cheap but for audio with personal value (say tapes from a deceased family member) it's a bargain. Better plan on two weeks, one to use it and one to figure out how to use it. Mike, do you recall any actual explanation of what the problem is, other than "extreme speed variation"? - my thought when I read that was a portable cassette recorder with low battery voltage loosing speed, I did some sonic repair on such a tape back in the analog age using the (limited) varispeed option of a Sony 510 and did at least get it slowed down so much that a transcript became humanly possible, albeit at a noise-cost. Capstan by Celemony no doubt is a fabulous product, but the point has not - as I recall this thread - been made that it is relevant for the problem that needs solving. Kind regards Peter Larsen |
#18
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Tape Speed Correction Software
On 10/22/2014 5:30 PM, Peter Larsen wrote:
"Mike Rivers" skrev i en meddelelse ... On 10/22/2014 9:40 AM, Sean Conolly wrote: The software you are looking for is called "Capstan" by Celemony. There is a 'rental' version - 1 week for $200. Still not cheap but for audio with personal value (say tapes from a deceased family member) it's a bargain. Better plan on two weeks, one to use it and one to figure out how to use it. Mike, do you recall any actual explanation of what the problem is, other than "extreme speed variation"? - my thought when I read that was a portable cassette recorder with low battery voltage loosing speed, I did some sonic repair on such a tape back in the analog age using the (limited) varispeed option of a Sony 510 and did at least get it slowed down so much that a transcript became humanly possible, albeit at a noise-cost. Capstan by Celemony no doubt is a fabulous product, but the point has not - as I recall this thread - been made that it is relevant for the problem that needs solving. I actually heard back from iZotope. They don't think their software will do the job. It remains to be seen whether Capstan might work. |
#19
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Tape Speed Correction Software
On 10/22/2014 5:30 PM, Peter Larsen wrote:
Mike, do you recall any actual explanation of what the problem is, other than "extreme speed variation"? No, he never clarified it or posted an example. Then he (I think it was the same "he") posted about problems with his Nakamichi cassette deck. That got me wondering if the problem was with the original recording or his playback. I don't think any of us can give him a real suggestion without knowing what the problem really is. There are plenty of pitch-time correction tools. How difficult it will be to fix his problem really depends on how fast the speed is varying. If there's a fairly constant change in speed over a one minute period, he can fix it in one-minute chunks. If the speed varies significantly over a period of a couple of seconds, then he'll have to fix it in chunks a few seconds long. The Plangent Process uses bias as a reference and can fix small rapid variations (flutter) but whether it can handle a repeating 50% change in speed over a period of a couple of seconds, like you'd get if you tapped out a jig on the supply reel with your finger, or the pinch roller's tension was weak and the tape kept slipping on the capstan, that's probably going to be a very tedious process, -- For a good time, visit http://mikeriversaudio.wordpress.com |
#20
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Tape Speed Correction Software
If the op can post a sample of the problem and the length of the tape, ill bet someone on here will make him an offer to fix it t for a fee or maybe even for free.
Mark |
#21
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Tape Speed Correction Software
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#22
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Tape Speed Correction Software
mcp6453 wrote:
On 10/22/2014 10:09 PM, wrote: If the op can post a sample of the problem and the length of the tape, ill bet someone on here will make him an offer to fix it t for a fee or maybe even for free. Mark I'll post a sample this weekend. The files are on a different computer. The recorder was running slowly causing the recording to appear fast. It is not the same problem that I'm having with the Dragon. The speed ups and slow downs in the problem recording are in the same spots. Could you not just play it back in sections on a variable-speed player and sort it out with a bit of editing? -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk |
#23
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Tape Speed Correction Software
On 23/10/2014 4:03 a.m., Mike Rivers wrote:
On 10/22/2014 9:40 AM, Sean Conolly wrote: The software you are looking for is called "Capstan" by Celemony. There is a 'rental' version - 1 week for $200. Still not cheap but for audio with personal value (say tapes from a deceased family member) it's a bargain. Better plan on two weeks, one to use it and one to figure out how to use it. ..... hopefully not in that order . geoff |
#24
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Tape Speed Correction Software
In article , Mike Rivers wrote:
I don't think any of us can give him a real suggestion without knowing what the problem really is. There are plenty of pitch-time correction tools. How difficult it will be to fix his problem really depends on how fast the speed is varying. If there's a fairly constant change in speed over a one minute period, he can fix it in one-minute chunks. If the speed varies significantly over a period of a couple of seconds, then he'll have to fix it in chunks a few seconds long. We can give him the suggestion of sending it to Wes Dooley and having him at least figure out what the original problem might have been. Cheaper to call someone who has the software than to buy a lot of software and try it all. The Plangent Process uses bias as a reference and can fix small rapid variations (flutter) but whether it can handle a repeating 50% change in speed over a period of a couple of seconds, like you'd get if you tapped out a jig on the supply reel with your finger, or the pinch roller's tension was weak and the tape kept slipping on the capstan, that's probably going to be a very tedious process, The Plangent system can use all kinds of references, including 60 Hz leakage. Although there are cheaper ways to resolve to 60 Hz leakage. I don't think anyone would be able to recover bias from a cassette but they might have some other noise that the Plangent software could be keyed on. I know they have keyed it on repeating motor noise from a cutting lathe. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#25
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Tape Speed Correction Software
"Adrian Tuddenham" skrev i en
meddelelse nvalid.invalid... mcp6453 wrote: On 10/22/2014 10:09 PM, wrote: If the op can post a sample of the problem and the length of the tape, ill bet someone on here will make him an offer to fix it t for a fee or maybe even for free. Mark I'll post a sample this weekend. The files are on a different computer. The recorder was running slowly causing the recording to appear fast. It is not the same problem that I'm having with the Dragon. The speed ups and slow downs in the problem recording are in the same spots. Could you not just play it back in sections on a variable-speed player and sort it out with a bit of editing? As I recall this Adobe Audition 1.5 is available for Mike. Its gliding stretch is the perfect treatment for analog tape with incorrect speed because speed variations over a reel tend to vary in a reasonably linear way. ~ Adrian Tuddenham ~ Kind regards Peter Larsen |
#26
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Tape Speed Correction Software
On 10/23/2014 10:42 PM, Peter Larsen wrote:
As I recall this Adobe Audition 1.5 is available for Mike. Its gliding stretch is the perfect treatment for analog tape with incorrect speed because speed variations over a reel tend to vary in a reasonably linear way. My interpretation of his description of the speed problem was that it was erratic, not a change over a long enough period of time to be considered a steady (for that time) rate of change. But it could just be my vivid imagination. -- For a good time, visit http://mikeriversaudio.wordpress.com |
#27
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Tape Speed Correction Software
"Mike Rivers" skrev i en meddelelse
... On 10/23/2014 10:42 PM, Peter Larsen wrote: As I recall this Adobe Audition 1.5 is available for Mike. Its gliding stretch is the perfect treatment for analog tape with incorrect speed because speed variations over a reel tend to vary in a reasonably linear way. My interpretation of his description of the speed problem was that it was erratic, not a change over a long enough period of time to be considered a steady (for that time) rate of change. But it could just be my vivid imagination. We are still waiting for a good first question from the OP ... O;-) For a good time, visit http://mikeriversaudio.wordpress.com Kind regards Peter Larsen |
#28
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Tape Speed Correction Software
On 10/23/2014 11:39 PM, Peter Larsen wrote:
"Mike Rivers" skrev i en meddelelse ... On 10/23/2014 10:42 PM, Peter Larsen wrote: As I recall this Adobe Audition 1.5 is available for Mike. Its gliding stretch is the perfect treatment for analog tape with incorrect speed because speed variations over a reel tend to vary in a reasonably linear way. My interpretation of his description of the speed problem was that it was erratic, not a change over a long enough period of time to be considered a steady (for that time) rate of change. But it could just be my vivid imagination. We are still waiting for a good first question from the OP ... O;-) For a good time, visit http://mikeriversaudio.wordpress.com Kind regards Peter Larsen The tape speed is erratic. I will post a segment tomorrow. The computer with the file on it is not here at the moment. |
#29
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Tape Speed Correction Software
"mcp6453" skrev i en meddelelse
... The tape speed is erratic. Is the recording the problem or the playback? By logic such a variation could be caused by the delivery reel brake or a braking of it by some other cause. That would result in 4 types of segments: ok, braking, braked and speeding up. Considering the fairly slow rotation of a casette it might not be hopeless, albeit quite tedius to address those manually or batched. I will post a segment tomorrow. The computer with the file on it is not here at the moment. Have you asked the guy(s) Scott suggested what a probable price range is in case their (assumed)licensed Capstan software will do it? - even if still unheard it sounds very much like something I'd love to outsource ... Kind regards Peter Larsen |
#30
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Tape Speed Correction Software
On Sun, 26 Oct 2014 10:38:15 +0100, "Peter Larsen"
wrote: "mcp6453" skrev i en meddelelse ... The tape speed is erratic. Is the recording the problem or the playback? By logic such a variation could be caused by the delivery reel brake or a braking of it by some other cause. That would result in 4 types of segments: ok, braking, braked and speeding up. Considering the fairly slow rotation of a casette it might not be hopeless, albeit quite tedius to address those manually or batched. I will post a segment tomorrow. The computer with the file on it is not here at the moment. Have you asked the guy(s) Scott suggested what a probable price range is in case their (assumed)licensed Capstan software will do it? - even if still unheard it sounds very much like something I'd love to outsource ... Kind regards Peter Larsen Capstan is pretty nicely demoed on Youtube. It certainly seems to do much more than chopping the piece into chunks and re-clocking it. Have a look https://www.youtube.com/watch?v=QGzsnpfhIW8 d |
#31
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Tape Speed Correction Software
"Don Pearce" skrev i en meddelelse
... Capstan is pretty nicely demoed on Youtube. It certainly seems to do much more than chopping the piece into chunks and re-clocking it. Have a look https://www.youtube.com/watch?v=QGzsnpfhIW8 Very interesting, thank you! d Kind regards Peter Larsen |
#32
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Tape Speed Correction Software
On Sun, 26 Oct 2014 18:21:56 +0100, "Peter Larsen"
wrote: "Don Pearce" skrev i en meddelelse ... Capstan is pretty nicely demoed on Youtube. It certainly seems to do much more than chopping the piece into chunks and re-clocking it. Have a look https://www.youtube.com/watch?v=QGzsnpfhIW8 Very interesting, thank you! d The problem is, I can't imagine wanting this for regular use. I'd almost want it on rental for a day. d |
#34
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Tape Speed Correction Software
On 10/24/2014 12:42 AM, mcp6453 wrote:
The tape speed is erratic. I will post a segment tomorrow. The computer with the file on it is not here at the moment. Better late than never. Here's a one minute clip from the cassette tape mentioned previously. The problem is in the recording, not in the playback. Not only is the speed off, it is inconsistent. https://soundcloud.com/mcp6453/20th-anniversary It looks like Capstan could be useful, but I don't see it happening. |
#35
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Tape Speed Correction Software
Peter Larsen wrote:
"mcp6453" skrev i en meddelelse ... The tape speed is erratic. Is the recording the problem or the playback? Does he mean that the tapes speed varies over the length of a reel, or that the tape speed varies due to tape path motion instability over the short run, i.e., like wow and flutter, but perhaps wow-ish over an unusually long span? In the first case, would pitch serve as a reference to restablish timebase? In the second case, that fancy software that reads bias and other signal data would seem necessary, in part because there might be no point anywhere in the reel that the motion is stable. If the tape is constantly accelerating adn decelerating, that would seem a genuine nightmare to attempt to repair manually. By logic such a variation could be caused by the delivery reel brake or a braking of it by some other cause. That would result in 4 types of segments: ok, braking, braked and speeding up. Considering the fairly slow rotation of a casette it might not be hopeless, albeit quite tedius to address those manually or batched. I will post a segment tomorrow. The computer with the file on it is not here at the moment. Have you asked the guy(s) Scott suggested what a probable price range is in case their (assumed)licensed Capstan software will do it? - even if still unheard it sounds very much like something I'd love to outsource ... Kind regards Peter Larsen -- shut up and play your guitar * HankAlrich.Com HankandShaidriMusic.Com YouTube.Com/WalkinayMusic |
#36
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Tape Speed Correction Software
On 10/26/2014 9:30 PM, mcp6453 wrote:
Better late than never. Here's a one minute clip from the cassette tape mentioned previously. This is something that you can fix manually with a lot of patience. It sounds like a news broadcast and it's possible that it was broadcast that way. Of course that's no excuse for not trying to make it better than original if you care enough, or are willing to spend enough money to hire someone with experience and better tools than you have. Have you tried contacting NBC News to see if they have a copy in their archive of the original broadcast? -- For a good time, visit http://mikeriversaudio.wordpress.com |
#37
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Tape Speed Correction Software
mcp6453 wrote:
On 10/24/2014 12:42 AM, mcp6453 wrote: The tape speed is erratic. I will post a segment tomorrow. The computer with the file on it is not here at the moment. Better late than never. Here's a one minute clip from the cassette tape mentioned previously. The problem is in the recording, not in the playback. Not only is the speed off, it is inconsistent. https://soundcloud.com/mcp6453/20th-anniversary It looks like Capstan could be useful, but I don't see it happening. It's both speeding up and slowing down. All kinds of things can slow the tape down, but as long as the pinch roller is locked in place and the motor running right, it won't speed up. This sounds very much to me like a bad pinch roller or the pinch roller having not locked down properly. If it's on some tapes and not others, that would make sense. I'd talk to Wes Dooley about it. He might be too expensive to do the work but he'll probably be happy to talk about it and suggest possibilities. I do think this is the sort of thing the capstan software might do well. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#38
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Tape Speed Correction Software
"Scott Dorsey" skrev i en meddelelse
... It's both speeding up and slowing down. All kinds of things can slow the tape down, but as long as the pinch roller is locked in place and the motor running right, it won't speed up. The _recording_ slows down more or less or something happens in transit, sounds like a compact cassette or perhaps a dictaphone recording on mini-casette or even a recording answering machine recording of an incoming call that also was mangled in transit. This sounds very much to me like a bad pinch roller or the pinch roller having not locked down properly. If it's on some tapes and not others, that would make sense. I'd talk to Wes Dooley about it. He might be too expensive to do the work but he'll probably be happy to talk about it and suggest possibilities. I do think this is the sort of thing the capstan software might do well. NSA or the Brits or the Germans or "all of the above" probably have a better recording of it if the journalist called home from Russia ... O;-) Notice how clean the ending "more news in a minute" sounds, the audio was ailing when transmitted, something that suggests that it is as good as the radio station has it. --scott Kind regards Peter Larsen |
#39
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Tape Speed Correction Software
Mike Rivers:
Have you ever tried debating with a Vulcan? |
#40
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Tape Speed Correction Software
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