Date: Thu, 18 Jan 1996 20:25:33 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: james@miller.cs.uwm.edu (Jim Lowe) Cc: multimedia@freebsd.org, multimedia@rah.star-gate.com, tlehman@becky.acet.org, toml@mitre.org Subject: Re: FreeBSD and VAT Message-ID: <199601181925.UAA18399@labinfo.iet.unipi.it> In-Reply-To: <199601181856.MAA06528@miller.cs.uwm.edu> from "Jim Lowe" at Jan 18, 96 12:56:08 pm
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> The soundblaster will probably always sound a little choppy just because it
> really doesn't run at 8khz. The way to fix that is to purchase a full duplex
^^^^^^^^^^^^^^^^^^^
What do you mean by that ? You cannot expect any two cards to have
exactly the same rate, so the software (and I mean the user-level
software, not the device driver) must compensate speed mismatches
by removing/adding samples. If it doesn't in a soft way (by means
of small corrections at every segment), sooner or later you will
be way out of sync and you will hear clicks.
I cannot tell what is the maximum % difference in sample rates
which can give acceptable results (it depends a lot on the block
size you are using), but my feeling is that 1% or less should not
give too bad results.
Luigi
====================================================================
Luigi Rizzo Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it Universita' di Pisa
tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522 http://www.iet.unipi.it/~luigi/
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