Re: [Drc-fir-users] silence at beginning and end of correction impulse

[Denis S. <d.s...@in...>]

Hello Noel,

At 12.13 16/06/2005 -0700, Noel Gabriel wrote:
>I'm new to the list and thought I'd start out with a
>quick DRC question.  I've noticed that when DRC
>generates the correction impulse, there is about .2
>seconds of silence at the beginning of the file and a
>few seconds after the impulse spike.  Can this silence
>be removed to reduce latency, or would this affect the
>performance of the convolver negatively?

uhhhm, with the default configuration files the "silence" at the beginning 
should be only few ms. Are you sure you're looking at the right file 
(rps.pcm)? BTW, even if you're using a configuration with an higher latency 
(for example one with a linear phase target response, which has the spike 
at the center of the file) what you see before and after the spike isn't 
really silence. It's just the correction in the bass range, which is much 
longer in time and much lower in level, so you don't notice it at first 
glance.
         The only way to reduce latency is to reduce the allowed pre-echo 
and, if you use a convolver that increase the latency with the filter 
length, reduce also the correction resolution in the bass range, which 
allow for a shorter filter. I've tried filters shortened down to 4096 taps, 
which, with proper tuning, provided quite good results, but the difference 
in the bass was quite noticeable when compared with the full filter.

Bye,
--
	Denis Sbragion
	InfoTecna
	Tel: +39 0362 805396, Fax: +39 0362 805404
	URL: http://www.infotecna.it