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RE: REW considerations for time-aligning drivers

Posted by andy_c (A) on September 7, 2014 at 07:49:55

In Reply to: RE: REW considerations for time-aligning drivers posted by lokie on September 4, 2014 at 07:29:14:

Hi,

Sorry for the late response. I don't read or post to this forum much.

I'm not aware of anyone who's gotten loopback working for a USB mic. In this thread, someone tried a workaround using a software loopback, but it did not work.

The HolmImpulse software uses a single-input, single-output method and is still able to get a timing reference using the so-called "time locking" feature. So it might appear that this could be made to work with a USB mic. But in the HOLM Impulse - Timelock, creeping offset?? thread, Bill Waslo, author of the OmniMic measurement software, explains the reason why it doesn't work with some sound devices:

"That kind of thing can happen if the record (ADC ) clock isn't locked to the play (DAC ) clock of the soundcard. Some audio soundcards (for instance, the ones using TI PCMxxxx chips such as the Behrengers) use entirely separate timing sources for the two functions."
--Bill Waslo

In the case of a USB mic, the A/D clock is in the mic itself, while the D/A clock is in the sound device, so these can't by synchronized.

Bill has some workarounds whereby one can calculate the delay offset that needs to be added in an indirect way. You might check the XSim thread for more info. XSim is his free passive crossover design software.

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