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What's the difference between SNR and SQNR?

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What's the difference between them?
Thanks!
 

snr and sqnr

The difference is the noise to which they are referred to:

SNR (signal to noise ratio) considers any noise (e.g. thermal noise)

SQNR (signal to QUANTIZATION noise ratio) considers specifically quantization noise (usually arising fron analog to digital conversion).

Regards

Z
 
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