Dear Alsa gurus
I am using M-Audio Delta-44 Card. I have this card up
and running using ICE-1712 module. I am doing speech
processing in real time, in other words sending and
receiving 64 samples of data at the same time at
11025Hz sampling frequency. I am processing incoming
data, e.g doing FFT, peak finding, filtering,
generating sine wave for each peak, seperating
envelope and pitch, doing gaussian distribution and
finally generating an output speech. The latency for
this process should be 64*2/11025 = 11.6ms (but some
times the no. of samples changes to keep up with the
processing, varies from 64 - 90 samples). Even after
patching the linux kernel with low latency patches I
am getting variable latency.
I am relying on the code from latency.c which gives me
time latency but I am not sure if I can rely on that,
Now, my question is how can I say for sure how much
time has elapsed between the input and the output. is
there any other way I can find the time lapse between
the input and the output. Also, why the latency is
varying for each run between input and output. Would
changing the sound card help because I know I can't
use mmap with ICE1712.
Please let me know, how should I address this problem.
Is RTlinux a solution to this, but then I am not sure
if ALSA driver will work with that or not.
Thanks in advance.
=====
Yours Truly
Vineet Agrawal
Staff Research Associate III
University of San Francisco (UCSF)
Ph: 415 5024456 (office)
415 3414664 (mobile)
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