How can I convert 24 bit. 48000HZ .wav to 8 Bit 8000HZ .wav without noise? [closed]

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I can´t get this audio clean, So I don´t now what to do. I hace tried cleaning it, Transforming on various kinds of formats.

Answer 1

You may be interested in this. Generally Dithering may be important in your case.

Maybe these settings help you for starting:

sox input.wav -b 8 output.wav gain -1 rate 8000 dither -s

Answer 2

Open this sound in Audacity, convert to 80 kHz and apply noise filter on correct level.