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#1
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I have a bad audio tape that contains both sides of the tape recording
on one side. So when played you can hear both sides at the same time with one track backwards. Sonic Foundry has a reverse feature but I cant separate the 2 sides so that I can reverse just one (The audio clip shows up as just one waveform.) Is there a way to filter the waveform into its 2 track components? Help! Ben |
#2
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In article ,
Ben Nguyen wrote: I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. Have you considered adjusting the head geometry first? This sounds like the sort of thing you should try to fix in the analog domain. Once the green beans touch the mashed potatoes, the plate becomes toxic, right? |
#3
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![]() "Ben Nguyen" wrote: I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. Are you sure that the problem does not lie with your playback equipment or setup? It sounds like: a) you have possibly recorded a half track recording on a full track machine b) you have possibly set up your software to record in mono from a two track source c) your playback equipment is possibly hooked up incorrectly (I have seen people familiar with a Nagra IV-2 hook up a IV-S incorrectly and without realising and vice versa. I have also seen wiring fiascos where an inexperienced person has joined up the left and right where they intended to join the return.) d) someone has accidentally recorded over pre-existing material without erasing the original material. Sonic Foundry has a reverse feature but I cant separate the 2 sides so that I can reverse just one (The audio clip shows up as just one waveform.) Is there a way to filter the waveform into its 2 track components? No, however I suspect your problem is either due to a, b or c above, all of which can be remedied before going into the digital domain. In the event that it is in fact due to d, then IME it is usually impossible to do anything about it. I have seen a few cases where a half-track field recording was made on a poorly calibrated machine, in which case you need to manually re-calibrate your playback equipment to recreate the calibration of the original recorder. W |
#4
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"Ben Nguyen" wrote ...
I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. You are not playing it back with the same head configuration as it was recorded with. There is no substitute for using the corresponding geometry to play back the tape. Sonic Foundry has a reverse feature but I cant separate the 2 sides so that I can reverse just one (The audio clip shows up as just one waveform.) Once they have been mixed together (whether magneticaly, electically, or acousticaly) there are really no practical methods of separating them. Is there a way to filter the waveform into its 2 track components? No. You must find a tape machine with the same head arrangement (2-track, 4-track, whatever) as the tape was recorded with. |
#5
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![]() "james" wrote in message news:9w9ac.16452$Q45.13642@fed1read02... In article , Ben Nguyen wrote: I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. Have you considered adjusting the head geometry first? This sounds like the sort of thing you should try to fix in the analog domain. Once the green beans touch the mashed potatoes, the plate becomes toxic, right? No, this happens only with "creamed" vegetables (creamed corn, creamed peas, etc.) eeeeewwwwww! :-) |
#6
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Ben Nguyen wrote:
I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. Probably not a bad tape at all. Instead, you're playing the tape with the wrong tape player. For example, if you play a 4 track 1/4" wide tape with a two-track 1/4" tape player, you'll get exactly the results you've described. Try using a true 4-track player. The tracks on a 4-track 1/4" tape are interleaved. Track 1 & 3 as you go down the tape are recorded one way. Tracks 2 & 3 are recorded the other way. If you play this tape with a 2-track player, tracks 1 & 2 will be combined by the wider tape head in the 2-track player. That will give you exactly the symptoms you describe. |
#7
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Ben Nguyen wrote:
I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. This was recorded on a machine with a misaligned head, I assume. What you need is to play it back on a machine with a narrower than normal head. If this is a half-track tape, you can put it on a quarter-track machine and then move the head height adjustment up and down until you find a place where it sounds good. Sonic Foundry has a reverse feature but I cant separate the 2 sides so that I can reverse just one (The audio clip shows up as just one waveform.) Is there a way to filter the waveform into its 2 track components? This is a physical problem with the tape. It needs to be fixed with proper playback. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#8
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#9
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I have a bad audio tape that contains both sides of the tape recording
on one side. So when played you can hear both sides at the same time with one track backwards. It's probably a fine tape. You're just playing it on the wrong machine. There are several different track formats some of which will play back like this when the playback heads don't line up with the recorded tracks. That's where you need to solve the problem and it may involve looking around for someone to either do the transfer for you or, if you have a large number of tapes in that format, loan, rent, or sell you the correct machine. To put it a bit more directly... You're playing a half-track tape on a full-track machine. |
#10
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Scott Dorsey wrote:
Ben Nguyen wrote: I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. This was recorded on a machine with a misaligned head, I assume. What you need is to play it back on a machine with a narrower than normal head. Or it's 1/4 track being played back on 1/2 track? Or mono 1/2 track on fulltrack? -- ha |
#11
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hank alrich wrote:
Scott Dorsey wrote: Ben Nguyen wrote: I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. This was recorded on a machine with a misaligned head, I assume. What you need is to play it back on a machine with a narrower than normal head. Or it's 1/4 track being played back on 1/2 track? Or mono 1/2 track on fulltrack? Entirely possible. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#12
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#13
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It may have been a quarter-track stereo machine.
These record two tracks in the same half of the tape that a half track stereo machine uses for one track. NOT SO! Quarter-track quarter-inch machines have interleaved, not adjacent, stereo tracks. |
#14
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William Sommerwerck wrote:
It may have been a quarter-track stereo machine. These record two tracks in the same half of the tape that a half track stereo machine uses for one track. NOT SO! Quarter-track quarter-inch machines have interleaved, not adjacent, stereo tracks. For the OP, in case anyone didn't already know: Side 1 L --- Side 2 R --- Side 1 R --- Side 2 L --- so a 1/2-track machine would get side 1 L and reverse side 2 R on its left channel, etc, mixed more-or-less equally in the magnetic domain. |
#15
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Bad audio tape! Bad tape! behave!
(Ben Nguyen) wrote in message . com... I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. Sonic Foundry has a reverse feature but I cant separate the 2 sides so that I can reverse just one (The audio clip shows up as just one waveform.) Is there a way to filter the waveform into its 2 track components? Help! Ben If your source is 1/4", it is almost certainly 1/4 track. (or one of the less common formats meantioned by HA) Fix it by playing back on the right format machine. A Tascam or Otari 4 track would work just fine too. Forward info will be on tracks 1 and 3. If it is important material, and you are an analog newbie, get someone who knows what they're doing to help you. Make sure the heads are de-quaussed and if the machine hasn't been in service for a while, put a piece of shop-tape on it first to make sure the sucker isn't going to eat your source. Proper playback alignment for the format you're dealing with is also nice. wrote: .....It may have been a quarter track stereo machine. These record two tracks in the same half of the tape that a half track stereo machine uses for one track. You then turn the tape over to continue...... Steve Lane That's almost right. Quarter track records on half of each track of a half-track. Corresponds to tracks 1 and 3 of a 4 track head as the tape moves in the forward direction. Cassette is the same except twice as dinky. good luck ben. your troubles can be resolved, as long as the source stays intact. phillip sztenderowicz |
#16
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My bad, my original post should have been clearer...
I have a regular audio cassette, the kind that goes into your car's regular cassette deck. Its an audio book that was purchased a few years ago, and I was hoping I could try to salvage it digitally. Since it was obviously some manufacturing problem, I tried contacting the maker but they have not responded. I wouldnt mind tinkering with a spare cassette deck if it might do the trick, but Im not sure whats involved. "William Sommerwerck" wrote in message ... I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. It's probably a fine tape. You're just playing it on the wrong machine. There are several different track formats some of which will play back like this when the playback heads don't line up with the recorded tracks. That's where you need to solve the problem and it may involve looking around for someone to either do the transfer for you or, if you have a large number of tapes in that format, loan, rent, or sell you the correct machine. To put it a bit more directly... You're playing a half-track tape on a full-track machine. |
#17
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Primaudio wrote:
That's almost right. Quarter track records on half of each track of a half-track. Corresponds to tracks 1 and 3 of a 4 track head as the tape moves in the forward direction. Cassette is the same except twice as dinky. Just FTR, cassette has left and right on the same side, so a mono (1/2 track) cassette head plays back a stereo cassette correctly in mono (L+R); in contrast to the OP's apparent problem. L1 -- R1 -- R2 -- L2 -- |
#18
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In article ,
Ben Nguyen wrote: I wouldnt mind tinkering with a spare cassette deck if it might do the trick, but Im not sure whats involved. If you play it on a stereo deck, do you get the crosstalk in both channels? If not, the solution should be obvious. Otherwise, I'm sticking to my first suggestion, adjust the head geometry so that it isn't reading both tracks. Sometimes the azimuth screw gives enough range to do it. |
#19
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![]() "Richard Crowley" wrote in message ... "james" wrote in message news:9w9ac.16452$Q45.13642@fed1read02... In article , Ben Nguyen wrote: I have a bad audio tape that contains both sides of the tape recording on one side. So when played you can hear both sides at the same time with one track backwards. Have you considered adjusting the head geometry first? This sounds like the sort of thing you should try to fix in the analog domain. Once the green beans touch the mashed potatoes, the plate becomes toxic, right? No, this happens only with "creamed" vegetables (creamed corn, creamed peas, etc.) eeeeewwwwww! :-) hey its all goin to the same stomach! |
#20
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I have a regular audio cassette, the kind that goes
into your car's regular cassette deck. It's an audio book that was purchased a few years ago, and I was hoping I could try to salvage it digitally. Since it was obviously some manufacturing problem, I tried contacting the maker but they have not responded. YET ANOTHER example of asking for assistance and NOT giving the full story. Shame, shame, shame. The kind of problem you're describing SHOULD NOT occur with a Compact Cassette, because the left and right tracks are adjacent, and correctly "sum to mono" when played on a mono machine. Several people have suggested severe head misalignment, and I think that's likely. Try playing the tape on other machines -- both mono and stereo -- to see what happens. This should reveal whether the problem is with the tape or the player. |
#21
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"Ben Nguyen" wrote in message
... My bad, my original post should have been clearer... I have a regular audio cassette, the kind that goes into your car's regular cassette deck. Its an audio book that was purchased a few years ago, and I was hoping I could try to salvage it digitally. Since it was obviously some manufacturing problem, I tried contacting the maker but they have not responded. I wouldnt mind tinkering with a spare cassette deck if it might do the trick, but Im not sure whats involved. I seem to recall that early talking book recordings on cassette were sometimes prepared for a special cassette machine that enabled the use of the two stereo tracks as four separate mono tracks. I assume that hose PB machines had reverse play and head switching to play a single coherent mono track continuously from track 1 through track 4. Steve King |
#22
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I seem to recall that early talking book recordings on
cassette were sometimes prepared for a special cassette machine that enabled the use of the two stereo tracks as four separate mono tracks. I assume those PB machines had reverse play and head switching to play a single coherent mono track continuously from track 1 through track 4. The thought had crossed my mind. Westinghouse made a cassette recorder that allowed all four tracks to be recorded on independently. However, Philips did not like such machines, as they destroyed the mono/stereo compatibility that had been consciously designed into the system. |
#23
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#24
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#25
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Ben Nguyen wrote:
I have a regular audio cassette, the kind that goes into your car's regular cassette deck. Its an audio book that was purchased a few years ago, and I was hoping I could try to salvage it digitally. Since it was obviously some manufacturing problem, I tried contacting the maker but they have not responded. This can be one of two problems: 1. bad head height on the cassette duplicator. 2. bad head height on the duplication master. Almost certainly if you crank the head height on your cassette deck up and down (and you may need to tweak azimuth in the process), you will be able to get it to play properly. Be sure to realign the deck with a reference tape after this process. If not, it's a duplication master issue and you're screwed. But this is much less likely. I wouldnt mind tinkering with a spare cassette deck if it might do the trick, but Im not sure whats involved. Depends on the deck, but they should all have adjustments for head height and azimuth, although on the cheaper decks they interact a lot. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#26
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"William Sommerwerck" wrote in message ...
It may have been a quarter-track stereo machine. These record two tracks in the same half of the tape that a half track stereo machine uses for one track. NOT SO! Quarter-track quarter-inch machines have interleaved, not adjacent, stereo tracks. I don't think you read what I posted. I said "two tracks". Not stereo tracks. That is why you would get forward and reverse mixed. Steve Lane |
#28
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#29
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Ben Nguyen wrote:
I have a regular audio cassette, the kind that goes into your car's regular cassette deck. Its an audio book that was purchased a few years ago, and I was hoping I could try to salvage it digitally. Since it was obviously some manufacturing problem, I tried contacting the maker but they have not responded. Turn off the channel that's backwards when dubbing? Flip tape, rinse, and repeat? Perhaps. -- ha |
#30
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Hi Mike:
There was at least one talking book format that certainly did - and still does exist. Brilliance Corp. from Michigan records program material in mono on all four tracks of a stereo cassette and sells a earphone adapter that switches from L to R -- but both L and R were recorded in the same direction so if you play it on a stereo cassette player you hear both tracks but in the same direction. To be more specific; first you listen to the L track then you flip the cassette and listen the L track going the opposite direction then flip the cassette again but also switch the adapter so you are listening to the R track in the original direction and then in the other direction. They also use a Lexicon "Compander" to time compress the audio about 10% ( I know, in audio terms a compander doesn't do time compression but it was the name of the rack mounted computer Lexicon sold for around $8,000). The result is you get the entire book, unedited on usually just one more cassette than the other publishers use to give you a 50% edited version. I designed the system for them back in the early 1980s and (after reneging on their contract with me) they started doing everything in-house in the late 1980s. They continue putting out around a dozen books a year. Great idea and really excellent narration/acting - just be careful getting into a business relationship with them ;-) Brian "Mike Rivers" wrote in message news:znr1080691077k@trad... In article writes: I seem to recall that early talking book recordings on cassette were sometimes prepared for a special cassette machine machines had reverse play and head switching to play a single coherent mono track continuously from track 1 through track 4. The thought had crossed my mind. Westinghouse made a cassette recorder that allowed all four tracks to be recorded on independently. However, Philips did not like such machines, as they destroyed the mono/stereo compatibility that had been consciously designed into the system. I thought about a special talking book format too, but I suspect that if it ever really existed, it was gone by the time cassette players became common in cars. TEAC had to get a special license from Philips to make the 4-track cassette PortaStudio because it didn't conform to the cassette track recording standard format. -- I'm really Mike Rivers ) However, until the spam goes away or Hell freezes over, lots of IP addresses are blocked from this system. If you e-mail me and it bounces, use your secret decoder ring and reach me he double-m-eleven-double-zero at yahoo |
#31
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William Sommerwerck wrote:
I seem to recall that early talking book recordings on cassette were sometimes prepared for a special cassette machine that enabled the use of the two stereo tracks as four separate mono tracks. I assume those PB machines had reverse play and head switching to play a single coherent mono track continuously from track 1 through track 4. The thought had crossed my mind. Westinghouse made a cassette recorder that allowed all four tracks to be recorded on independently. However, Philips did not like such machines, as they destroyed the mono/stereo compatibility that had been consciously designed into the system. Hey, now, could this mystery tape have been recorded on a cassette 4-tracker than the recordist flipped wrongly? -- ha |
#32
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![]() "Steve King" wrote: edit I seem to recall that early talking book recordings on cassette were sometimes prepared for a special cassette machine that enabled the use of the two stereo tracks as four separate mono tracks. I assume that hose PB machines had reverse play and head switching to play a single coherent mono track continuously from track 1 through track 4. Even if this is the case, you should still end up with two separate tracks when using a standard stereo cassette player, except that one of these will merely be in reverse. I re-read the original post and what bothers me is that he seems to be saying that he recorded in mono. This leads me to believe that all he may need to do is set SoundForge to record a stereo file, after which he can create two new mono tracks and then use the reverse function to correct the backward one. W |
#33
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#34
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#35
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S O'Neill wrote:
For the OP, in case anyone didn't already know: Side 1 L --- Side 2 R --- Side 1 R --- Side 2 L --- This reminded me of an experience as a poor student in the late 70's when I would feed my stereo 71/2 ips quartertrack with scrap tape which a friend of a friend smuggled out of the EMI studios in London: during playback of quiet passages in one my recordings I could just discern a low level version of the theme from Dvorak's New World Symphony - played backwards at half speed. I kid you not. All very logical when you think through the track speed-, width-, geometry- and erasure issues. Actually, I was gobsmacked how easily recognizable that phantom recording was...those 'ol hot-shot composers knew how to pen a good tune g. Tom McCreadie (please remove "spamjam." for my real address) |
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