bformenc

bformenc — Deprecated. Codes a signal into the ambisonic B format.

Description

Codes a signal into the ambisonic B format. Note that this opcode is deprecated as it is inaccurate, and is replaced by the much better opcode bformenc1 which replicates all the important features; also note that the gain arguments are not available in bformenc1.

Syntax

aw, ax, ay, az bformenc asig, kalpha, kbeta, kord0, kord1
aw, ax, ay, az, ar, as, at, au, av bformenc asig, kalpha, kbeta, \
      kord0, kord1 , kord2
aw, ax, ay, az, ar, as, at, au, av, ak, al, am, an, ao, ap, aq bformenc \
      asig, kalpha, kbeta, kord0, kord1, kord2, kord3

Performance

aw, ax, ay, ... -- output cells of the B format.

asig -- input signal.

kalpha –- azimuth angle in degrees (clockwise).

kbeta -- altitude angle in degrees.

kord0 -- linear gain of the zero order B format.

kord1 -- linear gain of the first order B format.

kord2 -- linear gain of the second order B format.

kord3 -- linear gain of the third order B format.

Example

Here is an example of the bformenc opcode. It uses the file bformenc.csd.

Example 1102. Example of the bformenc 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
kr = 4410
ksmps = 10
nchnls = 8

;bformenc is deprecated, please use bformenc1

instr 1
        ; generate pink noise
        anoise pinkish 1000
        
        ; two full turns
        kalpha line 0, p3, 720
        kbeta = 0
        
        ; fade ambisonic order from 2nd to 0th during second turn
        kord0 = 1
        kord1 linseg 1, p3 / 2, 1, p3 / 2, 0
        kord2 linseg 1, p3 / 2, 1, p3 / 2, 0
        
        ; generate B format
        aw, ax, ay, az, ar, as, at, au, av bformenc anoise, kalpha, kbeta, kord0, kord1, kord2
        
        ; decode B format for 8 channel circle loudspeaker setup
        a1, a2, a3, a4, a5, a6, a7, a8 bformdec 4, aw, ax, ay, az, ar, as, at, au, av
        
        ; write audio out
        outo a1, a2, a3, a4, a5, a6, a7, a8
endin

</CsInstruments>
<CsScore>

; Play Instrument #1 for 20 seconds.
i 1 0 20
e


</CsScore>
</CsoundSynthesizer>


Credits

Author: Samuel Groner
2005

New in version 5.07. Deprecated in 5.09.