Fwd: Re: [linux-audio-user] Sampling rate problems on a VXPocket v2

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(a)bang-olufsen.dk web: www.bang-olufsen.com web: www.tonmeister.ca phone: +45 96 84 49 54