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The most obvious effect is that the maximum frequency that can be stored (the Nyquist frequency) is reduced. That is, the speech has been low-pass filtered. The attached samples illustrate this.
This should be apparent even at high sampling rates – you should hear a clear difference between the 32kHz and 16kHz sample rate files. Use good headphones if possible.
See also:
The effect is best described as a type of distortion. Using fewer bits means that the digital waveform is a worse approximation to the original analogue one. The attached samples demonstrate this (use headphones).
Tips:
- use headphones to listen
- you might need to download the files and play them outside your browser (which might not handle the 4 bit version)
This is the new version. Still under construction.