Kurzweil KSP8 MLAN IO OPTION - REV B, Reference, Page: 260 / 330

260
381 Pitcher
681 Mn Pitcher
Creates pitch from pitched or non-pitched signal
PAUs: 1
This algorithm applies a filter which has a series of peaks in the frequency response to the input signal.
The peaks may be adjusted so that their frequencies are all multiples of a selectable frequency, all the way
up to 24 kHz. When applied to a sound with a noise-like spectrum (white noise, with a flat spectrum, or
cymbals, with a very dense spectrum of many individual components), an output is produced which
sounds very pitched, since most of its spectral energy ends up concentrated around multiples of a
fundamental frequency.
If the original signal has no significant components at the desired pitch or harmonics, the output level
remains low. The left and right inputs are processed independently with common controls of pitch and
weighting. Applying
Pitcher to sounds such as a single sawtooth wave will tend to not produce much
output, unless the sawtooth frequency and the Pitcher frequency match or are harmonically related,
because otherwise the peaks in the input spectrum won’t line up with the peaks in the Pitcher filter. If
there are enough peaks in the input spectrum (obtained by using sounds with noise components, or
combining lots of different simple sounds, especially low pitched ones, or severely distorting a simple
sound) then Pitcher can do a good job of imposing its pitch on the sound.
The four weight parameters named Odd Wts, Pair Wts, Quartr Wts and Half Wts control the exact shape
of the frequency response of
Pitcher . An exact description of what each one does is, unfortunately,
impossible, since there is a great deal of interaction between them. Here are some examples with a Pitch
setting of
1 kHz , which is close to a value of C6. Weight settings are listed in brackets following this
format: [Odd, Pair, Quartr, Half].
Figure 123 Pitcher at [100, 100, 100, 100]
In Figure 124, all peaks are exact multiples of the fundamental frequency set by the Pitch parameter. This
setting gives the most “pitchiness” to the output.
Figure 124 Pitcher at [-100, 100, 100, 100]
Khz
dB
dB
Khz