| Hi Art, All.
Why not post this test to the sursound group? There's quite a few
_very_ experienced people there who are used to debugging on-the-ear.
It would have the advantage that they know their systems (and there a
quite a few varieties) and may be able to pick the problems quite
easily.
Just a thought,
David
On 12/07/2007, at 1:35 AM, Art Hunkins wrote:
> Attached is a test .csd suitable for all platforms, commandline
> only, to
> test in real time, stereo, quad and 8-channel (circular)
> implementations.
> ASCII keys trigger different positions (in degrees) around the unit
> circle,
> and no MIDI is required. Instructions in the form of comments are
> listed at
> the top of the .csd.
>
> Results/observations are as follows:
>
> Stereo seems to be OK, at least as representing the normal frontal
> range
> (+/- 90 degrees). (In the 90-270 degree range there is obviously
> something
> wrong going on.)
>
> Quad is only OK if you rearrange the speaker placement. The docs
> indicate
> speakers placed at 90 degree intervals (clockwise) starting at 45
> degrees.
> One would *assume* these channels to be numbered 1-4, which is not
> at all
> the usual numbering. At any rate, what seems to work is the following
> distribution of "ambisonic channels/speakers": 1 = LF, 2 = RF, 3 =
> RR, 4 =
> LR. Of course, this is not the usual numbering either.
>
> Circular 8-channel is mostly a mystery to me, and does not seem to be
> working in any very rational way, though whatever it is is
> symmetrical. 0
> and 180 degrees works as a paired extension of the quad arrangement
> above -
> with 5-8 directly behind 1-4. (In this arrangement, 0 is straight
> ahead and
> 180 degrees directly to the rear). However, this placement/
> interpretation
> does not work at 90 and 270 degrees.
>
> Incidentally this test can give significant data even without a
> monitor,
> just the appropriate audio-channel interface. (Mine has 8 channels
> of LED's,
> which gives useful visual feedback.) With this utility, the sine
> wave can be
> set to a desired position, the tone turned on then off, csound
> halted, and
> channel amplitudes observed.
>
> John ff - I'd like to test with your new bformdec. Is there a way I
> can get
> this code without having to compile Csound myself? (I don't believe
> I'm up
> to it.) Otherwise, you can test it simply by adding a minus sign to
> the
> first argument of the three bformdec's in the code. Personally,
> though, I'd
> much value the opportunity to do additional testing myself.
>
> Art Hunkins
>
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