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: [EMAIL PROTECTED] 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 ========================================
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By P. MITCHELL PROTHERO Published 11/21/2003 11:13 AM
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