trlowest
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## trlowest

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

## Description

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.

## Syntax

    fsig, kfr, kamp trlowest fin1, kscal

## Performance

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.

## Examples

Here is an example of the trlowest opcode. It uses the file trlowest.csd.

Example 1050. Example of the trlowest opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac     ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o trlowest.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs  = 1

    instr 1

    ain     diskin2 "beats.wav", 1
    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
    	outs	aout*2, aout*2

    endin
    </CsInstruments>
    <CsScore>
    f1 0 8192 10 1	;sine wave

    i 1 0 3
    e
    </CsScore>
    </CsoundSynthesizer>

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

## Credits

Author: Victor Lazzarini
February 2006

New in Csound 5.01

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