Re: [LAU] Use of 96 kHz sample rate to lower latency

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To: <linux-audio-user@...>
Date: Wednesday, January 1, 2014 - 7:48 pm

On Wed, Jan 01, 2014 at 03:21:29AM -1000, Joel Roth wrote:

> I was curious, if doubling the sample rate is a

At least by half, and if the antialiasing filters in the AD/DA
converters are designed for it, much better. When using small
period sizes (32 or less), the delay in these filters (which
are usually linear phase) will be the largest contribution to
latency.

This delay is roughy inversely proportional to the transition
band of the filter. If you don't use the full bandwidth that
96 kHz offers (up to 48 kHz) it could be much less than half
the value at 48 kHz. This is why 'digital snakes' connecting
stage and FOH mixer use 96 kHz.

> If one wanted to avoid the tradeoff of handling twice the

That won't work. Resampling requires the same type of filters,
when you resample to/from 48 kHz you'll get the same delay as
an AD/DA operating at that frequency.

Ciao,

--
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)

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Messages in current thread:
[LAU] Use of 96 kHz sample rate to lower latency, Joel Roth, (Wed Jan 1, 1:21 pm)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Fons Adriaensen, (Wed Jan 1, 7:48 pm)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Harry van Haaren, (Wed Jan 1, 9:33 pm)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Harry van Haaren, (Wed Jan 1, 1:56 pm)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Bill Gribble, (Thu Jan 2, 11:50 am)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Harry van Haaren, (Thu Jan 2, 12:27 pm)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Bill Gribble, (Thu Jan 2, 1:31 pm)
Re: [LAU] Use of 96 kHz sample rate to lower latency, Ralf Mardorf, (Wed Jan 1, 5:18 pm)