Potentially, analog recordings can provide the over-tones (harmonics) which
are filtered out in digital sampling using a step function. The choice of
sample rate used in a digital system is based on the Nyquist-Shannon
sampling theorem. This states that a sampled signal can be reproduced
exactly as long as it is sampled at a frequency greater than twice the
bandwidth of the signal. Therefore a sampling rate of 40 kHz would be enough
to capture all the information contained in a signal having frequency
bandwidth up to 20 kHz.
The frequency response for a conventional LP player might be 20 Hz - 20 kHz
+/- 3 dB. Unlike the audio CD, vinyl records (and cassettes) do not require
a cut-off in response above 20 kHz. The low frequency response of vinyl
records is restricted by rumble noise. The high frequency response of vinyl
depends on the record itself and on the cartridge.
<http://en.wikipedia.org/wiki/Quadraphonic>Quadraphonic
records contained frequencies up to 50 kHz, while some high-end turntable
cartridges have frequency responses of 120 kHz while having flat frequency
response over the audible band (e.g. 20 Hz to 15 kHz +/-0.3
dB).<http://en.wikipedia.org/wiki/Analog_recording_vs._digital_recording#cite_note-0>
In
addition, frequencies of up to 122 kHz have been experimentally cut on LP
records.
Long story short - vinyl can reproduce all the harmonics well above the
usual cut off of digital sampling but produces a nearly flat response in the
audible range. The best test of this is to listen to, say, J.S. Bach's
"Toccata and Fugue in D Minor" played on a full pipe organ (so you hear all
the harmonics and over-tones) and then immediately listen to the same piece
on a CD. The difference is stunning!
Cheers!!
Jim
On Wed, Jan 19, 2011 at 12:02 PM, Billy Zoom <billyzoom@billyzoom.com>wrote:
> A CD will sound just like what you recorded and mixed in the studio. Vinyl
> completely changes the sound because it requires so much processing, both
> in
> the mastering lab and in your phonograph. The only reason you don't dislike
> vinyl is because you never heard what anything sounded like before it went
> to vinyl.
> BZ
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--
Cheers!!
Jim
Then there was the mind reader who moved to Washington, D.C. and couldn't
find work.
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