nestedap
nestedap — Three different nested all-pass filters.
Syntax
ares nestedap asig, imode, imaxdel, idel1, igain1 [, idel2] [, igain2] \
[, idel3] [, igain3] [, istor]
Initialization
imode -- operating mode of the filter:
-
1 = simple all-pass filter
-
2 = single nested all-pass filter
-
3 = double nested all-pass filter
idel1, idel2, idel3 -- delay times of the filter stages. Delay times are in seconds and must be greater than zero. idel1 must be greater than the sum of idel2 and idel3.
igain1, igain2, igain3 -- gain of the filter stages.
imaxdel -- will be necessary if k-rate delays are implemented. Not currently used.
istor -- Skip initialization if non-zero (default: 0).
Performance
asig -- input signal
If imode = 1, the filter takes the form:
Picture of imode 1 filter.
If imode = 2, the filter takes the form:
Picture of imode 2 filter.
If imode = 3, the filter takes the form:
Picture of imode 3 filter.
Examples
Here is an example of the nestedap opcode. It uses the file nestedap.csd, and beats.wav.
Example 654. Example of the nestedap 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 ; Audio out Audio in No messages -odac -iadc -d ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o nestedap.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 kr = 4410 ksmps = 10 nchnls = 2 instr 5 insnd = p4 gasig diskin2 insnd, 1 endin instr 10 imax = 1 idel1 = p4/1000 igain1 = p5 idel2 = p6/1000 igain2 = p7 idel3 = p8/1000 igain3 = p9 idel4 = p10/1000 igain4 = p11 idel5 = p12/1000 igain5 = p13 idel6 = p14/1000 igain6 = p15 afdbk init 0 aout1 nestedap gasig+afdbk*.4, 3, imax, idel1, igain1, idel2, igain2, idel3, igain3 aout2 nestedap aout1, 2, imax, idel4, igain4, idel5, igain5 aout nestedap aout2, 1, imax, idel6, igain6 afdbk butterlp aout, 1000 outs gasig+(aout+aout1)/2, gasig-(aout+aout1)/2 gasig = 0 endin </CsInstruments> <CsScore> f1 0 8192 10 1 ; Diskin ; Sta Dur Soundin i5 0 3 "beats.wav" ; Reverb ; St Dur Del1 Gn1 Del2 Gn2 Del3 Gn3 Del4 Gn4 Del5 Gn5 Del6 Gn6 i10 0 4 97 .11 23 .07 43 .09 72 .2 53 .2 119 .3 e </CsScore> </CsoundSynthesizer>