From: Janina Sajka <janina@afb.net>
To: <blinux-list@redhat.com>
Subject: Re: Technical Question (was Digital Talking Book Standard )
Date: Mon, 19 Nov 2001 17:23:42 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.33.0111191722050.3206-100000@toccata.grg.afb.net> (raw)
In-Reply-To: <Pine.LNX.4.33.0111191616390.22650-100000@xanadu.home>
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
next prev parent reply other threads:[~ UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
Martin G. McCormick
` Nicolas Pitre
` Janina Sajka [this message]
Martin G. McCormick
` Nicolas Pitre
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