Any idea whether an ambisonic B encode/decode for stereo or quad could be
done in Csound in *real time*?

Art Hunkins

----- Original Message ----- 
From: "Victor Lazzarini" 
To: "Developer discussions" ; "Art
Hunkins" 
Sent: Friday, October 27, 2006 7:17 PM
Subject: Re: [Csnd] MIDI Pan Curve


I'd say ambisonics. Even stereo reductions are
quite impressive.

>
> A general question about pan opcodes (including UDO's):
>
> Which of the available options give the clearest spatial
> localization?
>
> I understand that many acoustical factors are involved in
> achieving two- or three-dimensional imaging, but would
> like advice as to which Csound opcodes create the *most
> precise* positioning in the stereo (or quad) field.
>
> I've always been disappointed that my attempts to position
> sounds have largely fallen flat, and not been perceptually
> apparent in any very specific sense. (I've used the pan
> opcode.) In a nutshell, I'm looking for Csound code that
> can better project perceptual space.
>
> Thanks for sharing your experience.
>
> Art Hunkins
>
> ----- Original Message -----
> From: "Steven Yi" 
> To: 
> Sent: Friday, October 27, 2006 3:27 PM
> Subject: Re: [Csnd] MIDI Pan Curve
>
>
> Hi All,
>
> Just wanted to note that I did a bug fix of this panning
> UDO today (hard left gave NaN for right channel signal)
> and have renamed it to pan_gm2 as it's a recommendation
> for General Midi 2 implementors.  If you've downloaded
> this UDO please try downloading again here:
>
>
http://www.csounds.com/udo/displayOpcode.php?opcode_id=90
>
> Thanks!
> steven
>
>
> On 10/26/06, Steven Yi  wrote:
> > Hi All,
> >
> > I came across a document today called "Default Pan
> Curve" on the MIDI website:
> >
> > http://www.midi.org/about-midi/specshome.shtml
> >
> > and have implemented it as a UDO here:
> >
> >
>
http://www.csounds.com/udo/displayOpcode.php?opcode_id=90
> > > It's described in the spec as:
> >
> > Over the course of the development of MIDI, different
> > manufacturers have implemented
> > their own responses to CC#10. In addition, various
> > AMEI/MMA Specification (such as GM2 and
> > DLS2) have recommended response curves that are not all
> > the same. The different pan curves produce
> > an equal power distribution between the left and right
> > channels, but in some cases, a true center could
> > not be achieved by following the recommended equation
> > directly. The formula in this RP does achieve a
> > true center and uses an equal power distribution, which
> is desirable. >
> > The formula given is:
> >
> > Left Channel Gain [dB] = 20*log (cos (Pi/2*
max(0,CC#10
> > - 1)/126) Right Channel Gain [dB] = 20*log (sin (Pi
/2*
> max(0,CC#10 - 1)/126) >
> >
> > I realized just now that I've rescaled the values to be
> > between -1 and 1 which is what I'm accustomed to, but
> > then naming it pan_midi doesn't make that much sense
> > then.  Would anyone have a recommendation on what to
> call this?  And should a pan_midi which takes in 0-127 be
> added? >
> > Thanks!
> > steven
> >
> --
> Send bugs reports to this list.
> To unsubscribe, send email to
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>
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Absolutely - I routinely do live electronic pieces with Ambisonics
functioning as an "abstraction layer" for the spatialization, decoding
to 2, 4, 6, or 8 channels depending on the gig.  The decoding math is
just a multiplication or two and add per channel.  The encoding math is
not much more involved.  Very cheap operations.

Yours truly,
David

Art Hunkins wrote:
> Any idea whether an ambisonic B encode/decode for stereo or quad could be
> done in Csound in *real time*?
> 
> Art Hunkins
> 
> ----- Original Message ----- 
> From: "Victor Lazzarini" 
> To: "Developer discussions" ; "Art
> Hunkins" 
> Sent: Friday, October 27, 2006 7:17 PM
> Subject: Re: [Csnd] MIDI Pan Curve
> 
> 
> I'd say ambisonics. Even stereo reductions are
> quite impressive.
> 
>> A general question about pan opcodes (including UDO's):
>>
>> Which of the available options give the clearest spatial
>> localization?
>>
>> I understand that many acoustical factors are involved in
>> achieving two- or three-dimensional imaging, but would
>> like advice as to which Csound opcodes create the *most
>> precise* positioning in the stereo (or quad) field.
>>
>> I've always been disappointed that my attempts to position
>> sounds have largely fallen flat, and not been perceptually
>> apparent in any very specific sense. (I've used the pan
>> opcode.) In a nutshell, I'm looking for Csound code that
>> can better project perceptual space.
>>
>> Thanks for sharing your experience.
>>
>> Art Hunkins
>>
>> ----- Original Message -----
>> From: "Steven Yi" 
>> To: 
>> Sent: Friday, October 27, 2006 3:27 PM
>> Subject: Re: [Csnd] MIDI Pan Curve
>>
>>
>> Hi All,
>>
>> Just wanted to note that I did a bug fix of this panning
>> UDO today (hard left gave NaN for right channel signal)
>> and have renamed it to pan_gm2 as it's a recommendation
>> for General Midi 2 implementors.  If you've downloaded
>> this UDO please try downloading again here:
>>
>>
> http://www.csounds.com/udo/displayOpcode.php?opcode_id=90
>> Thanks!
>> steven
>>
>>
>> On 10/26/06, Steven Yi  wrote:
>>> Hi All,
>>>
>>> I came across a document today called "Default Pan
>> Curve" on the MIDI website:
>>> http://www.midi.org/about-midi/specshome.shtml
>>>
>>> and have implemented it as a UDO here:
>>>
>>>
> http://www.csounds.com/udo/displayOpcode.php?opcode_id=90
>>>> It's described in the spec as:
>>> Over the course of the development of MIDI, different
>>> manufacturers have implemented
>>> their own responses to CC#10. In addition, various
>>> AMEI/MMA Specification (such as GM2 and
>>> DLS2) have recommended response curves that are not all
>>> the same. The different pan curves produce
>>> an equal power distribution between the left and right
>>> channels, but in some cases, a true center could
>>> not be achieved by following the recommended equation
>>> directly. The formula in this RP does achieve a
>>> true center and uses an equal power distribution, which
>> is desirable. >
>>> The formula given is:
>>>
>>> Left Channel Gain [dB] = 20*log (cos (Pi/2*
> max(0,CC#10
>>> - 1)/126) Right Channel Gain [dB] = 20*log (sin (Pi
> /2*
>> max(0,CC#10 - 1)/126) >
>>> I realized just now that I've rescaled the values to be
>>> between -1 and 1 which is what I'm accustomed to, but
>>> then naming it pan_midi doesn't make that much sense
>>> then.  Would anyone have a recommendation on what to
>> call this?  And should a pan_midi which takes in 0-127 be
>> added? >
>>> Thanks!
>>> steven
>>>
>> --
>> Send bugs reports to this list.
>> To unsubscribe, send email to
>> csound-unsubscribe@lists.bath.ac.uk
>>
>> --
>> Send bugs reports to this list.
>> To unsubscribe, send email to
>> csound-unsubscribe@lists.bath.ac.uk
> 
> 
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