Re: Why bother with lossy encoding?

Le 15/03/2017 11:30, Steve the Fiddle a écrit :
> Just a quick technical point: Increasing the sample rate of
> ("upsampling") a recording, does not and can not improved the quality
> of the encoded sound. Once the sound has been recorded in digital
> format, that is "it", that data contains specific audio information,
> and any subtle musical nuances that are missing are gone forever. It
> is physically impossible to magically restore audio information that
> is missing from the original.
>
> The difference that sample rate makes, is that it limits the maximum
> frequency that can be represented by the data. Uncompressed PCM data
> has an absolute limit to the frequencies that it can represent. The
> limit is half the sample rate (known as the "Nyquist frequency"). So
> for audio CDs, (sample rate 44100 Hz), audio frequencies must be below
> 22050 Hz. The only difference that a higher sample rate makes is that
> it could theoretically represent frequencies above 22050 Hz, but if
> the original recording is on CD, then there are no audio frequencies
> above 22050 Hz, and upsampling cannot change that, (other than by
> adding distortion).
>
> Steve
>
This is a technical point of view. But, as I already wrote it years ago 
on this list, I can really ear a difference. The sound is more warm.


-- 
Sincerely, Stephane Ascoet


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