The Kyma Language for Sound Design, Version 4.5

QuadOscillator
Xtra Sources Category
Multiplies the left channel of Envelope by a sine wave oscillator and the right channel of Envelope by a
cosine oscillator. The output is the sum of the ring-modulated left and right channels. If the Envelope
has the same signal but 90 degrees out of phase in the left and right channels, the lower sideband will be
cancelled out, leaving only the upper sideband (the sum of the frequencies of the Envelope and the
QuadratureOscillator).
Expand the SingleSideBandRM prototype for an example of how to use this as a nonharmonic frequency
shifter.
Frequency
This is the frequency of the sine and cosine oscillators. The frequency can be specified in units of pitch
or frequency. The following are all ways to specify the A above middle C:
440 hz (in hertz or cycles per second)
4 a (as the 4th octave A)
69 nn (as a MIDI notenumber)
4 c + 9 nn (as 9 half steps above middle C)
1.0 / 0.00227273 s (inverse of a period at 44.1 kHz sample rate)
The following are examples of how to control the frequency using MIDI, the virtual control surface, or a
third-party program:
!Pitch (key number plus pitch bend)
!KeyNumber nn (MIDI notenumber)
4 c + (!Frequency * 9 nn) (continuous controller from 4 c to 4 a)
Envelope
The left channel of Envelope will be multiplied by a sine and the right channel by a cosine. If this Sound
has gone through a PhaseShiftBy90 (forcing its left and right channels to be 90 degrees out of phase with
each other at a specified frequency), then putting it through the QuadratureOscillator will perform single
side band ring modulation. In this configuration, only the upper sideband is heard. To get the lower
sideband alone, use a negative frequency for the QuadratureOscillator (or else swap the left and right
channels of Envelope using a ChannelCrosser).
324