Speex dev - Feb 2008 - Can Speex frame size be expand from 160 to 320 for NB?

Thank you so much for your quick reply.

It looks quite easy to change it. But, how about those codebook and excite
table? I notice them have been fixed as the length of 160.

Thanks again,
Dennis

-----Original Message-----
From: Jean-Marc Valin [mailto:jean-marc.valin@usherbrooke.ca] 
Sent: Wednesday, February 13, 2008 4:03 PM
To: Dennis Liu
Cc: speex-dev@xiph.org
Subject: Re: [Speex-dev] Can Speex frame size be expand from 160 to 320 for
NB?

Dennis Liu wrote:
> I want to know the possibility of expanding frame size from 160 to 320
> for narrow band. What is the side-effect if do so? How many changes
> involved for the current code?
spx_int16_t my_buffer[320];
speex_encode_int(encoder, my_buffer, bits);
speex_encode_int(encoder, my_buffer+160, bits);

done

Cheers,

	Jean-Marc

Dennis Liu wrote:
> Thank you so much for your quick reply.
> 
> It looks quite easy to change it. But, how about those codebook and excite
> table? I notice them have been fixed as the length of 160.
In case it wasn't clear from my previous email, you don't want to change
Speex, you just encode two packets and that's it.

	Jean-Marc

Thanks Jean-Marc.

I do want to change Speex frame size to 320. In this case, I've changed
frame size in init and modes (include framesize and subframesize). However,
the audio quality becomes bad. It seems something else needs to be changed
as well. Could you give a clue?

Thanks,
Dennis


-----Original Message-----
From: Jean-Marc Valin [mailto:jean-marc.valin@usherbrooke.ca] 
Sent: Wednesday, February 13, 2008 4:22 PM
To: Dennis Liu
Cc: speex-dev@xiph.org
Subject: Re: [Speex-dev] Can Speex frame size be expand from 160 to 320 for
NB?

Dennis Liu wrote:
> Thank you so much for your quick reply.
> 
> It looks quite easy to change it. But, how about those codebook and excite
> table? I notice them have been fixed as the length of 160.
In case it wasn't clear from my previous email, you don't want to change
Speex, you just encode two packets and that's it.

	Jean-Marc