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Re: LF: 16 bit vs 24 bit ADC?

To: <[email protected]>
Subject: Re: LF: 16 bit vs 24 bit ADC?
From: "James Moritz" <[email protected]>
Date: Fri, 2 Dec 2011 17:02:17 -0000
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Dear Bill, Andy, LF Group,

It seems to me it should be quite easy to subject this to practical testing. First, using SpecLab etc., measure the SNR of a weak signal in the presence of noise, with the FFT parameters chosen so that the signal is near the quantisation noise level.. Then attenuate the signal and noise at the ADC input by, say, 24dB. This would effectively reduce the resolution/accuracy of the A-D conversion by 4 bits ( I guess you would want to chose the signal, noise and attenuation levels so that the external noise was well above the sound card or other ADC noise floor, with and without the attenuation). Then see if the SNR in the FFT output has changed.

Cheers, Jim Moritz
73 de M0BMU


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