Date: Tue, 08 Oct 96 12:08 PDT From: Denis DeLaRoca (310) 825-4580 <CSP1DWD@MVS.OAC.UCLA.EDU> To: Amancio Hasty <hasty@RAH.STAR-GATE.COM> Cc: multimedia@FREEBSD.ORG Subject: Re: GUS PnP driver release 4 Message-ID: <199610081908.MAA17088@freefall.freebsd.org>
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On Tue, 08 Oct 1996 05:37:00 -0700, Amancio Hasty <hasty@RAH.STAR-GATE.COM> said: > > 2.0 I will release another version of vat in about a day or so > after I get chance to test it further. Here's what I am seeing or rather hearing with the new sound driver. With vat-4.0b1a that you modified to use the card in full duplex the CBC Radio feed is coming ok -- though I keep hearing static, or rumble, on the background, not always but quite frequent though. The old echo/ reverb that I keep hearing with v3 of the driver seems now gone... but subjectively the sound is not as good as it should be I think. I then did the following experiment: run the stock vat-4.0b2. This is using the LBL supplied audio-voxware.cc module which drives the sound device in half duplex mode. With this driver Vat is supposed to clock audio output with an external timer. Maybe this is not supposed to work but it does, and the sound quality seems subjectively fuller and cleaner, ie., the background static re- ported above is gone. I also a couple of times, vat froze for a few seconds and the sound driver went into a reverb loop of about 3 secs. I don't know exactly what is happening with Vat's audio output algori- thm as the playout window increases linearly up to about 6secs and then ratchets down to about 3secs with accompanying sound distortion. Bottom line, in full-duplex mode sound is better, reverb distortion is gone, but background static is present. I have no idea wether it is an artifact of Vat -- and more puzzling than in half duplex the sound is subjectively cleaner. Can you post the audio-voxware.cc Vat source module that you are playing with -- I presume that's the only part that changed, ie., no changes to audio.cc? -- Denis
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