I looked at the spectrogram with Audacity for one of the files and see
the artifacts now. Thanks for the tip.
On Sun, 29 Oct 2017 06:18:34 GMT, John Doe <john.doe@myemail.com>
wrote:
>On Sat, 28 Oct 2017 14:37:18 GMT, "Puffer Belly" wrote:
>
>> There are no known hi-res sources for many of Uncle Phil's posts. I've
>> downloaded a few dozen of his posts (various files, not whole albums)
>> and checked the frequency spectrums with Audacity. All show a
>> brickwall filter was used at 20 kHz, which means these posts are
>> upconverted CDs (16 bits/44.1 kHz). There's nothing wrong with that
>> as long as you know what you are getting, which are very large files
>> of CD resolution music.
>>
>> If these posts had been ripped from analog sources (vinyl or tape), in
>> case you were wondering, then there would be frequency content out to
>> 30 kHz or higher and the roll off would be gradual, not a brickwall
>> shape.
>>
>> Regards,
>> PB
>
>They are not even CD sourced. I loaded the Dean Martin Volare Collection. Load then in to Sonic Visualiser and clearly from MP3. You can see all the nonsense that mp3 make up above 15Khz.
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