Hello,

I just did some surround recordings with the soundfiled microphone. I
am decoding it with bformdec1 and works fine. It would, however, be
nice if I could adjust the width of the image. How would one need to
change (amusingly gain) aw, ax, ay and az to change the width for the
front and back stereo pairs?

My understanding is that this format works as two crossed M/S setups
where Y stands for the conventional sides (fig-8) and X for the
crossed "side" (front-back fig 8). So presumably by lowering the level
of W (the omni that acts as a "mid") the image gets wider?

Thanks

Peiman


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i know joe anderson has done a bunch of stuff like this.
here's a pdf "poster" that has some matrix transform
http://ambisonics.iem.at/symposium2009/proceedings/ambisym09-josephanderson-ambitk-poster.pdf/at_download/file
(his email is on there too, im sure he'd be happy to pass along more details on the math if you want)

On Aug 18, 2011, at 1:08 PM, peiman khosravi wrote:

> Hello,
> 
> I just did some surround recordings with the soundfiled microphone. I
> am decoding it with bformdec1 and works fine. It would, however, be
> nice if I could adjust the width of the image. How would one need to
> change (amusingly gain) aw, ax, ay and az to change the width for the
> front and back stereo pairs?
> 
> My understanding is that this format works as two crossed M/S setups
> where Y stands for the conventional sides (fig-8) and X for the
> crossed "side" (front-back fig 8). So presumably by lowering the level
> of W (the omni that acts as a "mid") the image gets wider?
> 
> Thanks
> 
> Peiman
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
> 



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Thanks very much Matt. I'm going to study this pdf tomorrow.

Best,

Peiman

On 19 August 2011 00:32, matt ingalls  wrote:
> i know joe anderson has done a bunch of stuff like this.
> here's a pdf "poster" that has some matrix transform
> http://ambisonics.iem.at/symposium2009/proceedings/ambisym09-josephanderson-ambitk-poster.pdf/at_download/file
> (his email is on there too, im sure he'd be happy to pass along more details on the math if you want)
>
> On Aug 18, 2011, at 1:08 PM, peiman khosravi wrote:
>
>> Hello,
>>
>> I just did some surround recordings with the soundfiled microphone. I
>> am decoding it with bformdec1 and works fine. It would, however, be
>> nice if I could adjust the width of the image. How would one need to
>> change (amusingly gain) aw, ax, ay and az to change the width for the
>> front and back stereo pairs?
>>
>> My understanding is that this format works as two crossed M/S setups
>> where Y stands for the conventional sides (fig-8) and X for the
>> crossed "side" (front-back fig 8). So presumably by lowering the level
>> of W (the omni that acts as a "mid") the image gets wider?
>>
>> Thanks
>>
>> Peiman
>>
>>
>> Send bugs reports to the Sourceforge bug tracker
>>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
>> Discussions of bugs and features can be posted here
>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>>
>
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>
>


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