Newsgroups: comp.speech
Path: lyra.csx.cam.ac.uk!pavo.csi.cam.ac.uk!warwick!pipex!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!zombie.ncsc.mil!afterlife!jpcampb
From: jpcampb@afterlife.ncsc.mil (Joe Campbell)
Subject: Re: How to design an Adaptive Postfilter on CELP receiver
Message-ID: <1994Mar25.154934.17876@afterlife.ncsc.mil>
Organization: The Great Beyond
References: <wuch.5.764432515@wuch.iie.ncku.edu.tw>
Date: Fri, 25 Mar 1994 15:49:34 GMT
Lines: 26

In article <wuch.5.764432515@wuch.iie.ncku.edu.tw>,
Wu Chao Hsiang <wuch@wuch.iie.ncku.edu.tw> wrote:
>Hi all:
>     I am doing a Chinese Text-to-Speech system.
>     It is described on Fed Std 1016 that an adaptive postfilter on CELP
>receiver can enhence the output speech quality.
>     Is there anyone had ever tried to design such a filter ? and how does 
>it work ? 

For the short-term pole-zero type with adaptive spectral tilt
compensation, I highly recommend reading:

Chen, J-H and A. Gersho, "Real-Time Vector APC Speech Coding at
4800 bps with Adaptive Postfiltering," Proceedings of ICASSP,
1987, p. 2185-2188.

Beware, a patent has been applied for this filter, however,
other similar structures are possible.

Regards,
Joe
-- 
.............................................................................
; Dr. Campbell  N3JBC  jpcampb@afterlife.ncsc.mil  74040.305@compuserve.com ;
; I speak for myself!     Happiness = Reality - Expectations, Click & Clack ;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
