a

Converts a k-sig or k-array parameter to an a-sig output.

The k-sig version interpolates linearly its input to create the audio signal. The k-array opcode copies the first ksmps numbers in the array to an audio signal.

Syntax

a(k)
a(k[])

where the argument within the parentheses may be an expression. Value converters perform arithmetic translation from units of one kind to units of another. The result can then be a term in a further expression.

Examples

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

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

; hear the difference between instr.1 and 2
sr = 44100
ksmps = 32
nchnls = 2
0dbfs = 1

instr 1 ;sine wave at k-rate

ksig    oscil 0.8, 440, 1
; k-rate to the audio-rate conversion
asig =  a(ksig)
        outs asig, asig

endin

instr 2 ;sine wave at a-rate

asig    oscil 0.8, 440, 1
        outs  asig, asig

endin

</CsInstruments>
<CsScore>
; sine wave.
f 1 0 16384 10 1

i 1 0 2
i 2 2 2
e

</CsScore>
</CsoundSynthesizer>

See also

Sample Level Operators

More information on this opcode can be found in the Csound Journal, issue 10, written by Andrés Cabrera.

Credits

Author: Gabriel Maldonado

New in version 4.21 Array overload introduced in version 7.