User`s guide

34
Pitch Tracker
The Pitch Tracker extracts the pitch of a monophonic (not
necessarily monaural) signal, such as a solo voice or melodic
instrument.
Unpredictable things (which may or may not be useful) will happen
if you try to use the Pitch Tracker on polyphonic sounds. Even for
monophonic sounds, pitch is not always well defined, so results can
vary greatly depending on the input. The Pitch Tracker can be
“thrown off” by noise, silence, consonants and strong vocal
formants that overlap with the voice’s harmonics.
The Pitch Tracker has three parameters: a low frequency limit, a
high frequency limit, and a time interval. Every so often (at times
defined by the time interval), the Pitch Tracker determines the pitch
of the input signal within the specified frequency limits.
Accurate setting of the low and high frequency limits will go a long
way toward helping the Pitch Tracker determine the correct pitch.
If the time interval is set too low, the required processing time will
increase and the output may be somewhat jittery. If the time interval
is set too high, the output may not accurately reflect the signal’s
pitch changes.
The output of the Pitch Tracker is not interesting to listen to in
itself, but it may be used to modulate the frequency of other
waveforms or filters.
The output can also be used to modulate delay times; in this case,
SFX Machine Pro automatically calculates the inverse of the analyzed
pitch and applies it to the destination’s delay time.
When using the Pitch Tracker, the destination’s specified frequency
or filter frequency is ignored (unless the destination is also being
modulated by a non-pitch-tracked signal). The output of the Pitch
Tracker overrides the destination’s specified frequency value.