[music-dsp] Oversampling to improve ADC precision?
pierre.richemond at enst.fr
Sun Jan 18 11:00:01 EST 2004
> From: "Augmentics" <musicdsp at augmentics.com>
>> Can running a 10-bit ADC at 16 x normal speed give you the
>> equivalent of a 12-bit ADC?
> I don't know the numbers, but that is the basic idea of delta-sigma
> conversion, so you might want to read up on that.
Yes, exactly. For the numbers, oversampling by a factor of two
theoretically halves the power of quantization noise in the baseband,
effectively gaining 3 dBs SNR, or 1/2 equivalent quantization bit.
So you're right : gaining 2 bits can be obtained by oversampling 16 times.
Sigma-delta converters effectively push the concept to the limit and
consist in 1-bit converters (which just compare values) heavily
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