Date: Wed, 3 Sep 1997 21:58:45 -0700 From: John-Mark Gurney <gurney_j@efn.org> To: Andrew Reilly <reilly@zeta.org.au> Cc: luigi@labinfo.iet.unipi.it, multimedia@FreeBSD.ORG Subject: Re: snd970903.tgz and pnp970903.tgz Message-ID: <19970903215845.45947@hydrogen.nike.efn.org> In-Reply-To: <199709032316.JAA02065@gurney.reilly.home>; from Andrew Reilly on Thu, Sep 04, 1997 at 09:16:54AM %2B1000 References: <199709031724.TAA08293@labinfo.iet.unipi.it> <199709032316.JAA02065@gurney.reilly.home>
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Andrew Reilly scribbled this message on Sep 4: > Hi Luigi, > > Sorry to be a bother, but I think you probably know more about this > than most by now. > > On 3 Sep, Luigi Rizzo wrote: > > * fixed SB16 PnP operation, now works in 8 and 16bit, both > > capture and playback; > > > > not recognised/not working (although the SB16 driver still needs > > refinements in order to support full duplex operation). > > I haven't bought a sound card yet because I want to be sure that I can > do full-duplex, full bandwidth (48kHz preferably, 44.1kHz is OK) signal > processing. All I've heard about the SB16 (and by extension the SB32, > AWE32, and AWE64) says that the closest it comes to full-duplex is 16 > bits out/8 bits in. Is that the case? > > Are there any inexpensive sound cards with good AD/DA quality that can > do full duplex 16-bit? well... the CS4237b that I have works well.. I haven't gotten full duplex to work yet, but I think that is more of a problem with the isa.c version that I have and not the card... these cards are REALLY inexpensive... I can sell them for $25/each + shipping... (of course we would have to deal with export costs, etc.) right now I have it reliably doing 44k/16bit output.. I just haven't had any uses for record quite yet... I will be getting a couple more of these cards soon, and we will be exensivly using the full duplex mode.. so in a couple weeks I'll have more news for you... > In any case, do you have an idea of the minimum latency you could get > with a program that just did un-buffered reads and writes to the audio > device? Are we talking about <= 20ms? > > (I'm a DSP guy, and I would very much like to be able to prototype > algorithms on my workstation, before I have to cut them into DSP code.) -- John-Mark Gurney Modem/FAX: +1 541 683 6954 Cu Networking Live in Peace, destroy Micro$oft, support free software, run FreeBSD
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