FS and "AKO Phasing" update
don at till.com
Fri Jan 16 00:30:18 CET 1998
From: "Tony Allgood" <oakley at enterprise.net>
Date: Thu, 15 Jan 1998 21:55:23 -0000
Hang on a minute, I always thought that perceived pitch is the same as
received frequency. Would someone explain why it isn't the case?
Here in shifty circles...
Pitch Shift means changing the frequency components of the input
signal by a percentage, effectively transposing.
Frequency Shift means changing changing the frequency components of
the input signal by a specified number of cycles per second,
effectively detuning the harmonics from the fundamental.
Pitch Shift is implemented by storing pieces of the waveform and
playing them back at a different rate (digitally, using a
bucket-brigade delay line, a Hammond flying chorus delay line, with
tape, or with the Doppler shift in air) while Frequency Shift is a
variation on Ring Modulation.
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