The .wav files I'm producing are of stellar quality. However, once I turn them into .gsm, they sound buzzy and muffled.
An example line to convert:
sox file.wav -r 8000 -c 1 file.gsm
It'll sound much better if you go:
sox file.wav -r 8000 -c 1 file.gsm resample
Of course, there's only so much you can do to make 8kHz prompts sound any good. Doing the original recording at 8kHz is a good start.
-- Alastair Maw System Analyst @ MX Telcom www.mxtelecom.com
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