Re: [ecasound] channel manipulation

On Wed, September 26, 2012 7:30 pm, Julien Claassen wrote:
> Hello Patrick!
> Untested, but should work:

Can you help me make a little more sense of this please?

> ecasound -f:16,3,44100 -a:1,2,3 -i test.wav \
> -a:1 -chmix:1 \

mix channel 1 and 2 (stereo mixdown to mono)

> -a:2 -chmute:2 -chmove:1,2 \

mute channel 2 (right input) and move channel 1 (left) to output channel 2
- (left mono)

> -a:3 -chmute:1 -ea:-100 -chmove:2,3

mute channel 1 (left input), invert signal and move channel 2 (right
input) to output channel 3 - (right mono inverted)

> -a:all -o test-out.wav

output channels 1,2,3 to wav file.

> Will generate a 3-channel output wav, with: ch1: mono-mixdown of right
> and
> left. ch2: left channel, ch3: right channel inverted.
> I think you wanted a mix of the right inverted channel with the left?
> So in
> -a:3 use a -chcopy:3,2 at the end.

ex.

    -a:3 -chmute:1 -ea:-100 -chcopy:3,2

mute channel 1 (input), invert signal and copy channel 3 to channel 2

Is the result any different if I use this instead?

    -a:3 -chmute:1 -ea:-100 -chmix:2,3

> If you want the normal right channel as well, it will be four chains,
> in in
> chain 3, you will have:
> -a:3 -chmute:1 -ea:-100
> and in chain 4, the normal right:
> -a:4 -chmute:1 -chmove:2,3
> Though, depending on what you expect as output volumes, I'd use an
> overall
> decrease in amplitude. So at the beginning, directly after test.wav have
> something like -ea:50 .

That's my next trick. First I want to build the signal path then I will
start on the filters.

> I hope this helps. It looks a lot like you want to have this strange
> surround stereo format, that some CDs use and that I hadn't been able to
> decode once. :-)

I'm actually going a bit further than that but one step at a time :-)

--
Patrick Shirkey
Boost Hardware Ltd
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