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> CARR SPREAD
Determines the spread of the bandpass filters in the carrier bank. Low values result in a nar-
row frequency spectrum, whilst a value of +63 results in the entire frequency spectrum being
covered in the carrier signal. The value chosen for this parameter can have a dramatic affect
on the intelligibility of speech.
> SPECTRAL BAL
Determines the spectral balance between the higher and lower frequencies of the vocoder
signal. This parameter has a lot of influence on the overall character of the vocoder.
> BANDS
Determines the number of bandpass filters used by the vocoder. It is possible to choose
between 1 and 32 filter bands. Less filter bands result in a more typical vocoder sound,
whereas more filter bands increase the intelligibility of speech. The more filter bands there
are, the more calculating power is required, so polyphony might vary depending on the num-
ber of active filter bands.
> ATTACK
Determines the response time of the vocoder’s envelope followers. With longer attack times,
the response of the vocoder will become slower, reducing the intelligibility of speech.
> RELEASE
Determines the release time of the vocoder’s envelope followers. With longer release times,
the definition of the signal peaks becomes blurred, reducing intelligibility.
> SOURCE BAL
Determines the balance between the source signals and the vocoder signal. At +0 (default)
only the output of the vocoder is heard. Negative values add a certain amount of the carrier
signal to the vocoder signal, whereas positive values add a certain amount of the modulator
signal. At either extreme, you will hear only the carrier or modulator signals respectively.
indigo powercore manual.book Page 82 Thursday, April 22, 2004 12:23 PM