Date: Fri, 19 Jan 1996 15:34:48 +0100 (MET) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: schulzrinne@fokus.gmd.de (Henning Schulzrinne) Cc: hasty@rah.star-gate.com, multimedia@freebsd.org, multimedia@rah.star-gate.com Subject: Re: FreeBSD and VAT Message-ID: <199601191434.PAA00749@labinfo.iet.unipi.it> In-Reply-To: <199601191239.EAA01431@rah.star-gate.com> from "Henning Schulzrinne" at Jan 19, 96 01:39:14 pm
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> Given how cheap crystal oscillators are, I'm amazed that people build > cards that can't stick to a nominal frequency. (All useful frequencies > are multiples of either 8000 or 11025 Hz, it seems.) I believe all cards have crystals. The cheapest ones can only run at certain discrete frequencies which are an integral submultiples of the crystal. More sophisticated cards have a full synthetizer which allows a wider range of choices sample_freq = crystal * N1/N2 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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