On Tue, 2003-12-02 at 13:06, Andrew Burgess wrote: > >> Is there a DC offset which the cheap card is eating? > > >A DC offset is an interesting idea. How would I test for that? > > sox <file> -e stat > > displays midline amplitude. > > Or try a highpass filter, just as a test. > More data, but I'm not sure there's an answer there yet. The first file creates a very loud glitch sound, which the second one doesn't. The midline value seems better on the first, assuming this represents DC offset. bash-2.05b$ sox gmc2.ogg -e stat Samples read: 26972160 Length (seconds): 305.806803 Scaled by: 2147483647.0 Maximum amplitude: 0.999969 Minimum amplitude: -1.000000 Midline amplitude: -0.000015 Mean norm: 0.138033 Mean amplitude: 0.000003 RMS amplitude: 0.189967 Maximum delta: 0.959961 Minimum delta: 0.000000 Mean delta: 0.093997 RMS delta: 0.128996 Rough frequency: 4766 Volume adjustment: 1.000 bash-2.05b$ sox examplesustain.ogg -e stat Samples read: 11361130 Length (seconds): 128.810998 Scaled by: 2147483647.0 Maximum amplitude: 0.649841 Minimum amplitude: -0.661896 Midline amplitude: -0.006027 Mean norm: 0.069344 Mean amplitude: 0.002177 RMS amplitude: 0.092420 Maximum delta: 0.784546 Minimum delta: 0.000000 Mean delta: 0.072115 RMS delta: 0.095279 Rough frequency: 7235 Volume adjustment: 1.511 bash-2.05b$
