: Wav to ulaw convert is not working output file is getting sizzling sound

[shilpakas]

using (WaveFileReader reader = new WaveFileReader(inputWav))
var s = new RawSourceWaveStream(new MemoryStream(), new WaveFormat(8000, 16, 1));
using (var conversionStream = new WaveFormatConversionStream(newFormat, reader))
using (var convStream2 = new WaveFormatConversionStream(mulaw, conversionStream))
{
WaveFileWriter.CreateWaveFile(outputWav, convStream2);
// File.WriteAllBytes("voiceprompt_raw.wav", decoded);
}

[Mark Heath]

what is the format of the input wav file?
What are the values of "newFormat" and "mulaw"?
Try saving a WAV file after the first conversion stage to narrow down where the issue is

[shilpakas]

Thanks. it is .wav of 41KHZ and convert to g.711 format

[Mark Heath]

OK so first you must downsample to 8kHz (and stereo to mono). Then you can go to mu-law. This article explains more about multi-stage conversions

[shilpakas]

Sorry forgot to mention in above the file is in ADPCM
it is in compression state