ATSpartialtap

Returns a frequency, amplitude pair from an ATSbufread opcode.

Syntax

kfrq, kamp ATSpartialtap ipartialnum

Initialization

ipartialnum - indicates the partial that the ATSpartialtap opcode should read from an ATSbufread.

Performance

kfrq - returns the frequency value for the requested partial.

kamp - returns the amplitude value for the requested partial.

ATSpartialtap takes a partial number and returns a frequency, amplitude pair. The frequency and amplitude data comes from an ATSbufread opcode. This is more restricted version of ATSread, since each ATSread opcode has its own independent time pointer, and ATSpartialtap is restricted to the data given by an ATSbufread. Its simplicity is its attractive feature.

Examples

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

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

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

; by Menno Knevel - 2023

ires1 system_i 1,{{ atsa drumsMlp.wav drumsMlp1.ats }} ; default settings
ires2 system_i 1,{{ atsa -h.8 -c8 drumsMlp.wav drumsMlp2.ats }} ; longer hopsize & more cycles

instr 1 

ktime   line    0, p3, 2
        ATSbufread ktime, 1, p4 , 54
kfreq1, kam1    ATSpartialtap  5
kfreq2, kam2    ATSpartialtap  20
kfreq3, kam3    ATSpartialtap  30

aout1   oscil   kam1, kfreq1, 1
aout2   oscil   kam2, kfreq2, 1
aout3   oscil   kam3, kfreq3, 1
aout    =       (aout1+aout2+aout3)*10  ; amplify some more
        outs    aout * p5, aout * p5
endin

</CsInstruments>
<CsScore>
f 1 0 16384 10 1 0 .5 0 .33 ; square-ish wave
; stretch the drums...
i 1 0 2 "drumsMlp1.ats"    2.5 ; defaults settings for ATSA
i 1 3 10 "drumsMlp2.ats"   1   ; different settings
e
</CsScore>
</CsoundSynthesizer>

This example here uses an ATSpartialtap, and an ATSbufread to read partials 5, 20 and 30 from 'beats.ats'. These amplitudes and frequencies could be used to re-synthesize those partials, or something all together different.

See also

ATS Spectral Processing

Credits

Author: Alex Norman
Seattle,Washington
2004