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RE: TESTS: Round-up of Windows and Mac Audio Players.

"You are way off track. As you are already looking at an FFT you need to SUBTRACT (not add) process gain."

How so? Did I misapply the paper I've linked or are you saying the paper is incorrect? The paper seems be pretty clearly saying the exact opposite of what you've stated when it states "The theoretical FFT noise floor is therefore 10log10(M/2) dB below the quantization noise floor due to the processing gain of the FFT." The go on to show an example where the process gain is added to the theoretical quantization noise floor limit of the ADC.

The math in this case for the 24 bit ADC in question goes like this: Theoretical quantization noise floor limit = 6.02(24)+1.76=146.24dB. Processing gain = 10log((2^24)/2)=69.24dB, putting the theoretical FFT noise floor for a 24bit ADC at near 215.48dB below full scale according to the paper.


Edits: 06/16/13
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