Date: Fri, 14 Feb 2003 20:43:25 +0100 (MET) From: Peter B <pb@ludd.luth.se> To: freebsd-multimedia@FreeBSD.ORG Subject: Re: Bt878 & whitenoise (some observations..) Message-ID: <200302141943.h1EJhPn05756@brother.ludd.luth.se> In-Reply-To: <200302141805.h1EI5j8J033686@puma.icir.org> from Orion Hodson at "Feb 14, 2003 10:05:45 am"
next in thread | previous in thread | raw e-mail | index | archive | help
>Nicholas, just to clarify the deal with the cmi8738 and the clock rate. The >problem only manifests itself when setting the clock rate to 44.1kHz. The >maximum observed delta is 3%. There is no problem setting other rates. It >would depend on how an application dealt with the excess on whether you'd hear Sounds similar to an issue with the ESS1868 soundcards (A flag fixed it). . . >The problem Peter is describing may or may not be due to some analog phenomenon and might be curable by setting all unimportant audio controls to 0 in the mixer. It's won't help to alter the mixer settings at all. The effect of switching channels using fxtv + xawtv-3.76/record can be listened to here: http://wave.campus.luth.se/~pb/tmp/chanscan.wav (14 MB) >As described the problem not resemble an audio s/w or h/w problem, ie noise on all recordings or on noise on some and not other recordings would point to audio problem. Since the problem as described repeatable on certain channels, it looks more likely that the problem is analog or lies with the tuner, tuner driver, or tuner s/w. I must first point out that the stereo which is connected to the lineout of the soundcards mixer. At no time suffers from the whitenoise problem. Thus the problem should be entirely with the a7v333 (cmi8738) soundcard. It might be that the tuner driver writes settings wich affect the settings of the cmi8738 (iow bug). Althought I have hard to believe that. The freeze bug mentioned earlier might however point in this direction. Anyway the test now confirms that like the previous poster asked. The fenomen is not intermittent. It's always there. However I have memories of the problem going away at times, with no reasonable explanation. One solution could be to write the driver for the onboard dsp. And hope it's not affected this way. /P To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200302141943.h1EJhPn05756>