trlowest — Extracts the lowest-frequency track from a streaming track input signal.


The trlowest opcode takes an input containg TRACKS pv streaming signals (as generated, for instance by partials) and outputs only the lowest track. In addition it outputs two k-rate signals, corresponding to the frequency and amplitude of the lowest track signal.


fsig, kfr,kamp trlowest fin1, kscal


fsig -- output pv stream in TRACKS format

kfr -- frequency (in Hz) of the lowest-frequency track

kamp -- amplitude of the lowest-frequency track

fin -- input pv stream in TRACKS format.

kscal -- amplitude scaling of output.


Example 469. Example

ain inch 1                  ; input signal
fs1,fsi2 pvsifd ain,2048,512,1 ; ifd analysis
fst  partials fs1,fsi2,.003,1,3,500  ; partial tracking
flow,kfr,kamp trlowest fst,1 ; lowest freq-track 
      aout  tradsyn flow, 1, 1, 1, 1 ; resynthesis of lowest frequency
out aout

The example above shows partial tracking of an ifd-analysis signal, extraction of the lowest frequency and resynthesis.


Author: Victor Lazzarini;
February 2006

New in Csound5.01