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| T O P I C R E V I E W |
| Q-W-Y |
Posted - 01/25/2005 : 2:59:16 PM
Today, i've downloaded HW schemes of the Neuros and i've found interesting thing.
This is Data Sheet of Neuros's ADC/DAC TLV320AIC23:
http://focus.ti.com/lit/ds/symlink/tlv320aic23.pdf
When you look at 29. You will see this table:
http://www.ceskyinterier.cz/temp/NeurosSR.gif
Neuros's block diagram says, that Neuros uses 0;12;15 Mhz for codec_sys_clk.
Now look at the bottom of the table...
"The sampling rates are derived from the 12-MHz master clock. The available oversampling rates do not produce exactly 8-kHz, 44.1-kHz, and
88.2-kHz sampling rates, but 8.021 kHz, 44.117 kHz, and 88.235 kHz, respectively. "
I had synchronization problems with my friend's MiniDisc when we were mixing recordings of his band. Finally i know why. Because Neuros records at 44.117 kHz, not 44.1kHz !! The result was time shift.
I will use only 48kHz sampling rate in future....
Regards,
Q-W-Y
-----Q-W-Y, Czech paranoid android----- |
| 2 L A T E S T R E P L I E S (Newest First) |
| bynumite |
Posted - 07/12/2005 : 2:00:10 PM
Oh man! (light bulb goes off over head). I had the same problem last fall. I was recording the Neuros off the soundboard and some room mics into my old MD to post mix later. It was during mixing I realized they didn't match up exactly. I was able to use an audio editor to compress the length of the Neuros recoridngs, or maybe I lengthened the MD one, I can't recall just now, but that did provide a work-around. I always wondered what happened there.
Larry |
| spacekakes |
Posted - 07/12/2005 : 10:37:50 AM
quote:
Originally posted by Q-W-Y
"The sampling rates are derived from the 12-MHz master clock. The available oversampling rates do not produce exactly 8-kHz, 44.1-kHz, and
88.2-kHz sampling rates, but 8.021 kHz, 44.117 kHz, and 88.235 kHz, respectively. "
I had synchronization problems with my friend's MiniDisc when we were mixing recordings of his band. Finally i know why. Because Neuros records at 44.117 kHz, not 44.1kHz !! The result was time shift.
I will use only 48kHz sampling rate in future....
Regards,
Q-W-Y
-----Q-W-Y, Czech paranoid android-----
Yeah, that 0.04% difference in sampling rate at 44.1 is really going to be annoying. Why, if you record for ten minutes, the playback will actually last ten minutes plus 0.2 seconds.
Larry |
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