isize -- This is the size of the FFT to be performed. The larger the size the better the frequency response but a sloppy time response.
ioverlap -- This is the overlap factor of the FFT's, must be a power of two. The best settings are 2 and 4. A big overlap takes a long time to compile.
iwin -- This is the function table that contains the window to be used in the analysis. One can use the GEN20 routine to create this window.
ain1 -- The stimulus sound. Must have high frequencies for best results.
ain2 -- The modulating sound. Must have a moving frequency response (like speech) for best results.
kbias -- The amount of cross synthesis. 1 is the normal, 0 is no cross synthesis.
Here is an example of the cross2 opcode. It uses the files cross2.orc, cross2.sco and beats.wav.
Example 1. Example of the cross2 opcode.
/* cross2.orc */
/* Written by Kevin Conder */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1 - Play an audio file.
instr 1
; Use the "beats.wav" audio file.
aout diskin "beats.wav", 1
out aout
endin
; Instrument #2 - Cross-synthesize!
instr 2
; Use the "ahh" sound stored in Table #1.
ain1 loscil 30000, 1, 1, 1
; Use the "beats.wav" audio file.
ain2 diskin "beats.wav", 1
isize = 4096
ioverlap = 2
iwin = 2
kbias init 1
aout cross2 ain1, ain2, isize, ioverlap, iwin, kbias
out aout
endin
/* cross2.orc */
/* cross2.sco */
/* Written by Kevin Conder */
; Table #1: An audio file.
f 1 0 128 1 "ahh.aiff" 0 4 0
; Table #2: A windowing function.
f 2 0 2048 20 2
; Play Instrument #1 for 2 seconds.
i 1 0 2
; Play Instrument #2 for 2 seconds.
i 2 2 2
e
/* cross2.sco */