Re: Linear PCM audio: 44.1 KHz, monaural, 1-bit-per-second

Andrew Reilly <andrew-newspost@xxxxxxxxxxxxxxxxxxxxx> writes:

On Mon, 23 Jul 2007 06:59:44 -0400, Randy Yates wrote:

Because the subject of this thread is "linear PCM" and the sample rate
and method of sampling are very pertinent to the definition of linear
PCM.

Subject, smubject. That's not what Radium was asking about.

In other words, forget what he wrote and begin discussing what you
think he means? No thanks. I'll stick with what's written.

DSD is linear PCM, after all...

DSD is not linear PCM.

Sure it is. Two quantization levels, one bit per sample.

No, it's not. See below.

Linear PCM is defined in [proakiscomm] as follows:

Let x(t) denote a sample function emitted by a source and let x_n
denote the samples taken at a sampling rate f_s >= 2*W, where W is the
highest frequency in the spectrum of x(t). In PCM, each sample of the
signal is quantized to one of 2^R amplitude levels, where R is the
number of binary digits used to represent each sample. Thus the rate
from the source is R*f_s bits/s.

And how is that different from DSD? f_s is >> 2*W, but that's not against
the rules.

It's not the sample rate that prevents DSD from being linear PCM, but the
fact that it does not utilize simple linear quantization.
--
% Randy Yates % "Maybe one day I'll feel her cold embrace,
%% Fuquay-Varina, NC % and kiss her interface,
%%% 919-577-9882 % til then, I'll leave her alone."
%%%% <yates@xxxxxxxx> % 'Yours Truly, 2095', *Time*, ELO
http://home.earthlink.net/~yatescr
.

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