- Just Truncate. Ignore the least significant bits and chop them off.
- Apply Dithering. You still truncate the signal, but you also add some "random" noise at the base. For audio, this is a common operation because it helps reduce the perceived degradation from losing those bottom bits. There's a number of algorithms to do this, and they involve intelligently adding noise at the bottom bit levels of the signal. See the wikipedia article for more info: https://en.wikipedia.org/wiki/Dither
Convert wav file from 16 bit to 8 bit
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    Esraa abd Altoni
 on 29 Aug 2020
  
    
    
    
    
    Commented: Esraa abd Altoni
 on 1 Sep 2020
            I read file wav in 16 bit How covert wav to 8 bit depth
1 Comment
  Peter O
      
 on 29 Aug 2020
				
      Edited: Peter O
      
 on 29 Aug 2020
  
			Be aware that an 8-bit audio signal will not sound great. There's a couple methods:
Accepted Answer
  Ameer Hamza
      
      
 on 29 Aug 2020
        Specify the bit per sample option to the audiowrite function. For example
[y, Fs] = audioread('handel.wav');
audiowrite('handle2.wav', y, Fs, 'BitsPerSample', 8);
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