Description

A signal can be read from or written into a delay path, or it can be automatically delayed by some time interval.

Syntax

ares delay asig, idlt [, iskip]

Initialization

idlt -- requested delay time in seconds. This can be as large as available memory will permit. The space required for n seconds of delay is 4n * sr bytes. It is allocated at the time the instrument is first initialized, and returned to the pool at the end of a score section.

iskip (optional, default=0) -- initial disposition of delay-loop data space (see reson). The default value is 0.

Performance

asig -- audio signal

delay is a composite of delayr and delayw, both reading from and writing into its own storage area. It can thus accomplish signal time-shift, although modified feedback is not possible. There is no minimum delay period.

Examples

Here is an example of the delay opcode. It uses the file delay.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 delay.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

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

instr    1

adel	init 0
ilev    = p4				;level of direct sound
idelay  = p5 *.001			;Delay in ms
ifd	= p6				;feedback

ain	diskin2 "Mathews.wav", 1, 1
adel	delay   ain + (adel*ifd), idelay;ifd = amount of feedback
asig	moogvcf	adel, 1500, .6, 1	;color feedback
	outs    asig*ilev, ain

endin

</CsInstruments>
<CsScore>
;Delay is in ms
i 1  0  5  1.5  200 .95	;with feedback
i 1  +  5  1.5  20  .95
i 1  +  3  1.5  5   .95
i 1  +  7  2    5    0	;no feedback

e
</CsScore>
</CsoundSynthesizer>

See also

Delay