En Mon, 19 Jan 2009 21:57:04 -0200, Peter Pearson
<ppear...@nowhere.invalid> escribió:
The following code uses ossaudiodev to read 1000 values from
my sound card at a rate of 12,000 samples per second:
When I select a sample rate that is not a power of 2 times
3000 samples/second, a strong and very regular sawtooth is
superimposed on the signal. At some sampling frequencies,
it appears as a rising sawtooth, and at other sampling
frequencies it is a declining sawtooth, so I'm presumably
lost in some aliasing wilderness. As best I can tell,
it's a 48 KHz sawtooth.
That could be a hardware and/or driver limitation. By example, an
AC97-compliant chipset may provide a fixed rate of 48000 samples/second --
any sample rate conversion must be done by other means, if possible at all.
--
Gabriel Genellina
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