Sox and bad quality when converting to 8 kHz

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Hi list,
I have an 44100 Hz file with human voice, stereo with 16Bit.
When convertig this to 8 kHz, mono I loose a lot of quality and have
some ground noise. I tried several sox options but without success.
Can somebody help….

best regards Thomas

One thought on - Sox and bad quality when converting to 8 kHz

  • You really need to remove the bass end of the spectrum before
    downsampling to 8k/s. uLaw/ALaw sound pretty muddy and horrible if you
    don’t do that, and the other common 8k/s codecs don’t sound any better.
    Jean-Marc Valin wrote a little filtering utility for this purpose.

    Steve