zkmod, zamod, zkcl, zacl

  kr      zkmod     ksig, kzkmod
  ar      zamod     asig, kzamod
          zkcl      kfirst, klast
          zacl      kfirst, klast

Description

Clear and modulate the za and zk spaces.

Performance

ksig - the input signal

kzkmod - controls which zk variable is used for modulation. A positive value means additive modulation, a negative value means multiplicative modulation. A value of 0 means no change to ksig. kzkmod can be i-rate or k-rate

kfirst - first zk or za location in the range to clear.

klast - last zk or za location in the range to clear.

zkmod facilitates the modulation of one signal by another, where the modulating signal comes from a zk variable. Either additive or mulitiplicative modulation can be specified.

zamod modulates one a-rate signal by a second one, which comes from a za variable. The location of the modulating variable is controlled by the i-rate or k-rate variable kzamod. This is the a-rate version of zkmod

zkcl clears one or more variables in the zk space. This is useful for those variables which are used as accumulators for mixing k-rate signals at each cycle, but which must be cleared before the next set of calculations.

zacl clears one or more variables in the za space. This is useful for those variables which are used as accumulators for mixing a-rate signals at each cycle, but which must be cleared before the next set of calculations.

Examples

  k1      zkmod     ksig, 23    ; adds value at location 23 to ksig

  a1      zamod     asig, -402  ; multiplies asig by value at location 402 

Author

Robin Whittle
Australia
May 1997