bformdec1 — Decodes an ambisonic B format signal
ao1, ao2 bformdec1 isetup, aw, ax, ay, az [, ar, as, at, au, av \
[, abk, al, am, an, ao, ap, aq]]
ao1, ao2, ao3, ao4 bformdec1 isetup, aw, ax, ay, az [, ar, as, at, \
au, av [, abk, al, am, an, ao, ap, aq]]
ao1, ao2, ao3, ao4, ao5 bformdec1 isetup, aw, ax, ay, az [, ar, as, \
at, au, av [, abk, al, am, an, ao, ap, aq]]
ao1, ao2, ao3, ao4, ao5, ao6, ao7, ao8 bformdec1 isetup, aw, ax, ay, az \
[, ar, as, at, au, av [, abk, al, am, an, ao, ap,
aq]]]
aout[] bformdec1 isetup, abform[]
Note that horizontal angles are measured anticlockwise in this description.
isetup –- loudspeaker setup. There are five supported setups:
aw, ax, ay, ... -- input signal in the B format.
ao1 .. ao8 -– loudspeaker specific output signals.
Here is an example of the bformdec1 opcode. It uses the file bformenc1.csd.
Example 88. Example of the bformdec1 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 bformenc.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 8 0dbfs = 1 instr 1 ;without arrays ; generate pink noise anoise pinkish 1 ; two full turns kalpha line 0, p3, 720 kbeta = 0 ; generate B format aw, ax, ay, az, ar, as, at, au, av bformenc1 anoise, kalpha, kbeta ; decode B format for 8 channel circle loudspeaker setup a1, a2, a3, a4, a5, a6, a7, a8 bformdec1 4, aw, ax, ay, az, ar, as, at, au, av ; write audio out outo a1, a2, a3, a4, a5, a6, a7, a8 endin instr 2 ;with arrays (csound6) ;set file names for: S_bform = "bform_out.wav" ;b-format (2nd order) output S_sound = "sound_out.wav" ;sound output ; generate pink noise anoise pinkish 1 ; two full turns kalpha line 0, p3, 720 kbeta = 0 ;create array for B-format 2nd order (9 chnls) aBform[] init 9 ; generate B-format aBform bformenc1 anoise, kalpha, kbeta ;write out b-format fout "fout.wav", 18, aBform ;create array for audio output (8 channels) aAudio[] init 8 ;decode B format for 8 channel circle loudspeaker setup aAudio bformdec1 4, aBform ; write audio out fout S_sound, 18, aAudio endin </CsInstruments> <CsScore> i 1 0 8 i 2 8 8 e </CsScore> </CsoundSynthesizer>