From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <mail@redhat.com>
Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com
 [172.16.44.254])
	by listman.redhat.com (Postfix) with ESMTP id 92B063ECA1
	for <blinux-list@listman.redhat.com>; Mon, 19 Nov 2001 16:40:06 -0500 (EST)
Received: from mail.redhat.com (mail.redhat.com [199.183.24.239])
	by int-mx1.corp.redhat.com (8.11.6/8.11.6) with SMTP id fAJLe6p24317
	for <blinux-list@listman.redhat.com>; Mon, 19 Nov 2001 16:40:06 -0500
Received: (from mail@localhost)
	by mail.redhat.com (8.11.0/8.8.7) id fAJLe6f16405
	for blinux-list@listman.redhat.com; Mon, 19 Nov 2001 16:40:06 -0500
Received: from xanadu.home (modemcable084.137-200-24.mtl.mc.videotron.ca
 [24.200.137.84])
	by mail.redhat.com (8.11.0/8.8.7) with ESMTP id fAJLe5w16401
	for <blinux-list@redhat.com>; Mon, 19 Nov 2001 16:40:05 -0500
Received: from localhost (nico@localhost)
	by xanadu.home (8.11.6/8.11.6) with ESMTP id fAJLe6U23740
	for <blinux-list@redhat.com>; Mon, 19 Nov 2001 16:40:06 -0500
X-Authentication-Warning: xanadu.home: nico owned process doing -bs
Date: Mon, 19 Nov 2001 16:40:06 -0500 (EST)
From: Nicolas Pitre <nico@cam.org>
X-X-Sender: <nico@xanadu.home>
To: <blinux-list@redhat.com>
Subject: Re: Technical Question (was  Digital Talking Book Standard )
In-Reply-To: <200111192105.fAJL58a00921@dc.cis.okstate.edu>
Message-ID: <Pine.LNX.4.33.0111191616390.22650-100000@xanadu.home>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Loop: blinux-list@redhat.com
Sender: blinux-list-admin@redhat.com
Errors-To: blinux-list-admin@redhat.com
X-BeenThere: blinux-list@redhat.com
X-Mailman-Version: 2.0.1
Precedence: bulk
Reply-To: blinux-list@redhat.com
List-Help: <mailto:blinux-list-request@redhat.com?subject=help>
List-Post: <mailto:blinux-list@redhat.com>
List-Subscribe: <https://listman.redhat.com/mailman/listinfo/blinux-list>,
	<mailto:blinux-list-request@redhat.com?subject=subscribe>
List-Id: Linux for blind general discussion <blinux-list.redhat.com>
List-Unsubscribe: <https://listman.redhat.com/mailman/listinfo/blinux-list>,
	<mailto:blinux-list-request@redhat.com?subject=unsubscribe>
List-Archive: <https://listman.redhat.com/pipermail/blinux-list/>

On Mon, 19 Nov 2001, Martin G. McCormick wrote:

> 	My question is whether or not it is possible to sample at
> rates that are deliberately non-standard in order to simulate the
> effect of a continuous speed control.

You can't expect most soundcard to do any samplerate.

> 	This may sound totally off-topic, but a digital Talking
> Book player has to be able to vary its sampling rate in order to
> emulate a speech compressor.

Absolutely not.  The technique to do that involves duplication and/or 
supression of signal patterns based on period windows.  This is perfectly 
doable in software without altering the samplerate at all.  Since this is 
performed numerically you can have much better results than any conventional 
methods.


Nicolas