Re: Why bother with lossy encoding?

Steve,

However, there could be a difference, not by increasing the bandwidth of 
the audio signal, but helping to make better profit of it. If we have 
only 44100 samples a second to represent a 20 kHz audio bandwidth, the 
smoothing filter requirements are stringent, which could lead to several 
kinds of artifacts (phase delay, transients). If the same signal is 
digitally resampled to 96 kHz with a high-quality codec, then the signal 
reconstruction may improve since the filter artifacts can be reduced and 
shifted towards higher frequencies.

Regards,

Federico


On 15/03/2017 7:30, Steve the Fiddle wrote:
> 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
>
> On 15 March 2017 at 07:16, Stephane Ascoet
> <[email protected]> wrote:
>> Le 14/03/2017 18:11, Roger a écrit :
>>> Ditto here, as I consider myself to have good ears for classical music.
>>>
>>> Extracted all of my CD's into PCM WAV avoiding the lossy compression codecs,
>>> but still noticing the metallic/tin type sound reminiscent of CD grade audio,
>>> even with a 5.1 home stereo grade DAC.  I seem to prefer the 24-bit 48kHz
>>> sampling, but am no where near being rich to upgrade my entire music
>>> collection.  Can still recall the days of Tape and LP, where music was less
>>> tinny sounding.  But then that's also getting back to the days where tubes were
>>> also more common.
>>>
>>> I've also tried upsampling the CD audio to 24-bit 48kHz sampling, while using
>>> an ALSA LP filter, helps but not significantly enough.  Shrugs, maybe my ears
>>> are just getting too old and too tired.
>>>
>> Hi, I've got a Sony 3000 ES expanding them to 96 khz at playing, results
>> are incredibly impressive with some CDs. With some others, that has been
>> very poorly engineered, there's no difference, the sound remains tiny.
>>
>> --
>> Sincerely, Stephane Ascoet
>>
>>
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