[vorbis-dev] About lossless and point stereo

[Stephen So]

No problem.

My first question was related to the swapping that occurs in lossless 
stereo coupling when angle was larger than magnitude and how the decoder 
knows to reswap them.  It just so happens that when this does occur, the 
angle becomes negative.  Therefore, in the decoupling routine, when mag 
 > 0 but angle < 0, we have

pcmA[j]=mag;
pcmM[j]=mag+ang;

which does the required swap

My second  question related to point stereo and how the angle is set to 
0.  Monty confirmed that point stereo (currently) sets the angle to 0 
(hence, no diffuse sounds).  He said that this will likely change in the 
future.  With regards to mid/side stereo, he said that there is no need 
to implement that in Vorbis.

Best regards,

Steve.

<p>Nicolas Pitre wrote:

>On Tue, 24 Feb 2004, Stephen So wrote:
>
>  
>
>>Never mind about my previous post.  Monty sorted me out on mIRC :)
>>    
>>
>
>For the benefit of other people consulting the archive, would you mind 
>answering your own questions?
>
>Tnx.
>
>
>Nicolas
>
>
>
>  
>


-- 
--------------------------------------------------
Stephen So, BEng(Hons)

PhD Student, 
Signal Processing Laboratory,
School of Microelectronic Engineering,
Faculty of Engineering and Information Technology,
Griffith University, Nathan Campus,
Brisbane, QLD, Australia, 4111.

Phone: +61-7-3875 3754
E-mail: s.so at griffith.edu.au
--------------------------------------------------

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