21 Feb
2010
21 Feb
'10
1:30 p.m.
Colin Fletcher wrote:
Playback sounds OK to my ears (at least at 44.1kHz).
I've now tried 48kHz sample rate as well, and this also sounds right on
playback.
Capture is very noisy: there's a white noise-like
signal superimposed on
the captured sound, and sounding like its amplitude is modulated by the
captured signal.
I played back a 440Hz sine wave and recorded it back in. Results for
44.1kHz are here:
http://www.starlingaudio.co.uk/misc/audiofiles.tar.bz2
The signal starts at silence, and fades up to 0dB over 10 seconds.
Looking at the waveforms, it appears that sections 4 or 5 samples long
are "shuffled" out of order in the captured signal.
I tried the same thing at 48kHz, and the noise on the captured signal
was similar, but more "metallic" sounding, presumably because 48kHz is a
multiple of the USB rate so the "shuffled" sections are of more constant
length.
I hope this is useful feedback.
Cheers,
Colin.