Fwd'd to alsa-devel. Geoffrey Martin wrote: > > > > Hi, > > I'm using the following: > IBM T40 laptop > Digigram VXPocket v2 > RedHat 9 > Kernel 2.4.22-ac4 > ALSA drivers 0.9.8 > vxloader 0.9.7-i686 > > Measurement gear > Audio Precision System Two Cascade > PrismSound DSA-1 > > > Some of my other gear is having difficulties locking to the S/PDIF output > of the card at 44.1 kHz and I have a suspicion as to why this is > happening... > > I have control over the sampling rate of the S/PDIF output of the card as I > would expect, however... > > In the S/PDIF Channel Status Block information there is a portion of Byte 3 > that is used to send the intended sampling rate (selectable between three > values, 32 kHz, 44.1 kHz and 48 kHz, depending on the arrangement of bits > 0-3 in Byte 3. For specific information on this, please see Application > Note AN22REV2 from www.crystal.com). It is also possible, using bit 0 of > Byte 0, to indicate whether the signal is Professional or Consumer format. > > Using my present configuration, I do not appear to have control over either > of these two variables. For example, even when I am sending a 44.1 kHz > signal at a rate of 44.1 kHz (or close enough... it's actually 44.0993, -17 > ppm) Byte 3 of the Channel Status Block is saying that the signal is a 48 > kHz transmission. > > Are the VXPocket drivers in ALSA capable of changing these values in the > card? The official drivers for Mac OSX allow me to change the Pro/Consumer > flag using an application, and the sampling rate indicator changes > automatically with the actual sampling rate of the card's output. > > Cheers > -geoff > > > > > ____________________________________________________ > Geoff Martin Ph.D. > Tonmeister, Bang & Olufsen a/s > email: ggm@xxxxxxxxxxxxxxx > web: www.bang-olufsen.com > web: www.tonmeister.ca > phone: +45 96 84 49 54 > > > > -- Patrick Shirkey - Boost Hardware Ltd. Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== Apparently upon the beginning of the barrage, the donkey broke discipline and panicked, toppling the cart. At that point, the rockets disconnected from the timer, leaving them strewn around the street. Tethered to the now toppled cart, the donkey was unable to escape before the arrival of U.S. troops. United Press International Rockets on donkeys hit major Baghdad sites By P. MITCHELL PROTHERO Published 11/21/2003 11:13 AM
