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Re: Hello and a Sony PCM D100 question

Subject: Re: Hello and a Sony PCM D100 question
From: madl74
Date: Sun Jun 22, 2014 9:31 am ((PDT))
>  REC LEVEL 3 (clipping level : -9 dBu),
>  S/N100 off: noise floor: -105 dBu(A), dynamic range: 99dB
>  S/N100 on: noise floor: -116 dBu(A), dynamic range: 107dB


What did the noise floor consist of? Is this level the added dither? You can 
get total silence below 15 bits +1 without dither but the quantising noise 
is then bad. The output is a 16 bit uncompressed file, even if 18 bits were 
used in quantising it, so what is the effective final dither level? 108dBs 
is a dynamic range of 18 bits and with a parity bit, this is 19 bit A to D. 

Are the Sony figures about adding two bits worth of dynamic range taking 
dither into account, or is this an engineering exercise in numbers? I can't 
see how you can get 18 bits into a 16 bit WAV pint pot. The dynamic range 
from 1 bit (square wave) to 15 bits digital is 84dBs. 

If you or anyone has a WAV file of "silence" on the two settings it may be 
interesting to compare them. 

David Brinicombe 

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