st2ms — Stereo to Mid-Side Conversion.
This opcode implements stereo to mid-side (MS) conversion. It is a pure function with no side effects.
am -- mid signal output.
as -- side signal output.
aleft -- left channel input.
aright -- right channel input.
Here is an example of the st2ms opcode. It uses the files st2ms.csd and stereoJungle.wav.
Example 1005. Example of the st2ms 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 -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o st2ms.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ; by Menno Knevel - 2021 ; sample = ambient sound of waterfall + animals (monkey) instr 1 al, ar diskin2 "stereoJungle.wav", 1 ; stereo sample am, as st2ms al,ar fout "MSJungleEncoded.wav", -1, am *.6, as *.6 ; write MS encoded audio file to disk outs am *.6, as *.6 ; & reduce volume a bit endin instr 2 al, ar diskin2 "MSJungleEncoded.wav", 1 ; get back in the MS encoded sample am, as ms2st al,ar, p4 outs am, as endin </CsInstruments> <CsScore> i1 0 6.7 ; encode signal, write to disk i2 10 6.7 .5 ; read encoded file from disk and decode 1:1 i2 17 6.7 .7 ; decode but with more width e </CsScore> </CsoundSynthesizer>