Hi All,
I am trying to read data from a usb microphone and using the pretty standard
method of using ioctl's to setup the sampling rate, channels, bits and block
size . This all works so the device is correctly setup. I then use "read" to
read samples from the device which shows up as /dev/dsp1. I get a lot more
samples from this read command in one second of recording than the set
sample rate. E.g. if i set 10Khz on one run i got 269312 samples. Looking at
the raw data it looks like there is a lot of duplication of data? is this
common for the audio input device? if so what kind of encoding is it (e.g
with some specific redundancy built in)?
thanks
farhan
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Received on Tue Feb 1 08:15:02 2011
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