[Csnd] UDOs or Ambisonics

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1

Hello everyone!

I’m still on my way through the ambisonics jungle in csound and i looked into the UDOs by Martin Neukom.

I have a question related to rendering a file.
How can i use for example the ambi3D_enc_dist1 or ambi_encode and render the encoded signals to a file? with beformenc i just sended the array to a fout opcode. But these UDOs doesn’t produce a direct output? Or is this related to the ZAK System?

All the best,
Philipp
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2

hi philipp -

yes i think it is because martin used the zak feature. i never used it, but i think you can straightforward change it to direct audio output.

for instance, in the UDO "ambi2d_encode_3" (example 05B11 in The Csound FLOSS Manual), you can change

opcode ambi2D_encode_3, 0, ak
asnd,kaz xin
kaz = $M_PI*kaz/180
                 zawm asnd,0
                 zawm cos(kaz)*asnd,1 ;a11
                 zawm sin(kaz)*asnd,2 ;a12
                 zawm cos(2*kaz)*asnd,3 ;a21
                 zawm sin(2*kaz)*asnd,4 ;a22
                 zawm cos(3*kaz)*asnd,5 ;a31
                 zawm sin(3*kaz)*asnd,6 ;a32
endop

to

opcode ambi2D_encode_3, aaaaaaa, ak
asnd,kaz xin
kaz = $M_PI*kaz/180
                 a1 = asnd
                 a2 = cos(kaz)*asnd
                 a3 = sin(kaz)*asnd
                 a4 = cos(2*kaz)*asnd
                 a5 = sin(2*kaz)*asnd
                 a6 = cos(3*kaz)*asnd
                 a7 = sin(3*kaz)*asnd
endop

i hope it works; i leave the test to you ...

  joachim