From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.44.254]) by listman.redhat.com (Postfix) with ESMTP id 3A74F3EAFA for ; Mon, 19 Nov 2001 17:24:19 -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 fAJMOJp04121 for ; Mon, 19 Nov 2001 17:24:19 -0500 Received: (from mail@localhost) by mail.redhat.com (8.11.0/8.8.7) id fAJMOJI23980 for blinux-list@listman.redhat.com; Mon, 19 Nov 2001 17:24:19 -0500 Received: from toccata.grg.afb.net (w088.z208036108.was-dc.dsl.cnc.net [208.36.108.88]) by mail.redhat.com (8.11.0/8.8.7) with ESMTP id fAJMOIw23976 for ; Mon, 19 Nov 2001 17:24:18 -0500 Received: from localhost (janina@localhost) by toccata.grg.afb.net (8.11.6/8.11.6) with ESMTP id fAJMNht03427 for ; Mon, 19 Nov 2001 17:23:43 -0500 X-Authentication-Warning: toccata.grg.afb.net: janina owned process doing -bs Date: Mon, 19 Nov 2001 17:23:42 -0500 (EST) From: Janina Sajka X-X-Sender: To: Subject: Re: Technical Question (was Digital Talking Book Standard ) In-Reply-To: Message-ID: 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: List-Post: List-Subscribe: , List-Id: Linux for blind general discussion List-Unsubscribe: , List-Archive: Martin: It sounds like you're extrapolating from experience with analog systems that achieve similar results. Fortunately, the science has become much more sophisticated. I say that's fortunate because the results can be much much better than those we've heard on analog tape decks. Generically, the process is known as "Time Scale Modification." I bet a good way to begin to come up to speed on that would be a google search on this phrase. On Mon, 19 Nov 2001, Nicolas Pitre wrote: > 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 > > > > _______________________________________________ > Blinux-list mailing list > Blinux-list@redhat.com > https://listman.redhat.com/mailman/listinfo/blinux-list > -- Janina Sajka, Director Technology Research and Development Governmental Relations Group American Foundation for the Blind (AFB) Email: janina@afb.net Phone: (202) 408-8175 Chair, Accessibility SIG Open Electronic Book Forum (OEBF) http://www.openebook.org Will electronic books surpass print books? Read our white paper, Surpassing Gutenberg, at http://www.afb.org/ebook.asp Download a free sample Digital Talking Book edition of Martin Luther King Jr's inspiring "I Have A Dream" speech at http://www.afb.org/mlkweb.asp Learn how to make accessible software at http://www.afb.org/accessapp.asp