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#1
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Audio Pops due to Electrical Issues?
When recording from DAT to my PC using my soundcard's coaxial SPDIF
in, I find myself getting occasional pops in the recorded WAV. I suspect that this is due to me turning on and off my amplifier. I have my TV, Tivo, amplifier and DAT on one surge protector and my computer on another surge protector and both surge protectors go into the same wall outlet. Does anyone have any advice for me to eliminate these pops? I could just stop turning off my amplifier while recording, but I don't know if other electrical equipment will affect the recording also. I did experiments turning on and off my amplifier at 10 second intervals while recording and did indeed get some pops at those points. Tests turning on and off my TV and Tivo proved inconclusive. If I were to buy a UPS for my PC, will this help me? Should I also have a UPS for my amplifier/TV? Is the cause of the pops due to a power "spike" affecting my PC/hard drive's power source, or my DAT machine's? I am using an M-Audio 1010-LT soundcard. Thanks for any help! |
#2
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Audio Pops due to Electrical Issues?
When recording from DAT to my PC using my soundcard's coaxial SPDIF in, I find myself getting occasional pops in the recorded WAV I suspect it's do to clocking issues. Make sure your soundcard is slaved to the incoming clock from the DAT machine. Joe Egan EMP Colchester, VT www.eganmedia.com |
#3
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Audio Pops due to Electrical Issues?
Hi,
Thanks for the responses! It could also be due to noise pickup by the coax itself. How long is it, and how is it routed? It's 6 feet and goes from my Tascam coaxial out to my soundcard SPDIF in. Should I be routing it in a particular way? I also tried using a short 7 pin to coaxial SPDIF cable (less than 1 ft) going from my Sony D100 to my soundcard SPDIF in, with the same problem. This led me to believe that it wasn't the coaxial cable's fault, but of course both cables could be to blame. But I used to have a 3rd cable that I used with a different computer and seem to remember having similar problems, and the short cable worked for me then. Yes, my soundcard's master clock is locked to the SPDIF in. |
#4
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Audio Pops due to Electrical Issues?
karatebabies wrote:
It could also be due to noise pickup by the coax itself. How long is it, and how is it routed? It's 6 feet and goes from my Tascam coaxial out to my soundcard SPDIF in. Should I be routing it in a particular way? I also tried using a short 7 pin to coaxial SPDIF cable (less than 1 ft) going from my Sony D100 to my soundcard SPDIF in, with the same problem. This led me to believe that it wasn't the coaxial cable's fault, but of course both cables could be to blame. But I used to have a 3rd cable that I used with a different computer and seem to remember having similar problems, and the short cable worked for me then. Yes, my soundcard's master clock is locked to the SPDIF in. It's not the cable. It might be a ground loop, though. A lot of "S-PDIF" interfaces today don't actually follow the spec and aren't transformer-isolated. But if it's taking place with your D100 running off batteries so there is no other ground connection between the two devices, it's not a ground loop. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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Audio Pops due to Electrical Issues?
Scott,
It might be a ground loop, though. A lot of "S-PDIF" interfaces today don't actually follow the spec and aren't transformer-isolated. But if it's taking place with your D100 running off batteries so there is no other ground connection between the two devices, it's not a ground loop. My D100 was not running off batteries, I had the DC in plugged in. So if it's the ground loop, do you have any suggestions? Should I plug my Tascam to a different wall outlet, etc.? Also, I was wondering why are you able to dismiss the cable as a possible culprit? Thanks a lot for your help!! |
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