Speex dev - Feb 2010 - Fwd: Re: Fixed Point on wideband-mode: Single Frame loss on 2000 Hz sine causes "freak off"

You mean the "real" (not the synthesized) residual? What is odd in
your opinion? These glitches I mentioned or something else?


I replaced the interpolated lpc (variable "interp_lpc") with the
original lpc (variable lpc) for residual generation. This makes the situation
worse, so lpc interpolation seems to "smooth" the error and reduces
it. I will check the computation of the lpc and the fir_mem16 routine now.

cheers,
Frank

Jean-Marc Valin <Jean-Marc.Valin at USherbrooke.ca> hat am 2. Februar 2010
um 17:57 geschrieben:
> Just had a look and the fixed-point residual *does* look odd. That's
worth
> investigating (though I don't think it's related to LPC stability).
>
>     Jean-Marc
_________________________________________
NEU: Mit WEB.DE DSL ?ber 1000,- ? sparen!
http://produkte.web.de/go/02/

Considering that the input is a sine, I find these glitches a bit odd 
(maybe they also appear in other signals).

	Jean-Marc

On 2010-02-03 05:10, Frank Lorenz wrote:
> You mean the "real" (not the synthesized) residual? What is odd
in your opinion? These glitches I mentioned or something else?
>
>
> I replaced the interpolated lpc (variable "interp_lpc") with the
original lpc (variable lpc) for residual generation. This makes the situation
worse, so lpc interpolation seems to "smooth" the error and reduces
it. I will check the computation of the lpc and the fir_mem16 routine now.
>
> cheers,
> Frank
>
> Jean-Marc Valin<Jean-Marc.Valin at USherbrooke.ca>  hat am 2. Februar
2010 um 17:57 geschrieben:
>
>> Just had a look and the fixed-point residual *does* look odd.
That's worth
>> investigating (though I don't think it's related to LPC
stability).
>>
>>      Jean-Marc
> _________________________________________
> NEU: Mit WEB.DE DSL ?ber 1000,- ? sparen!
> http://produkte.web.de/go/02/
>
>
>