On Mon, 2003-10-20 at 01:47, Nick Arnold wrote: > Yes I think so, but I think it'd be easier to look at the recordings at a > sample-by-sample level. The process described in this follow-up post is > pretty much what we've been doing: > > > From: [EMAIL PROTECTED] > > To: Alsa-Devel <[EMAIL PROTECTED]> > > Date: Wed, 15 Oct 2003 15:01:01 -0700 > > Subject: Re: [Alsa-devel] HDSP 9652: Input channel corruption > > > > ... > > Then look at it in a waveform editor and zoom way in so you can see the > > individual samples. Check the temporal alignment between track 1 and > > track 2 (using 1-based indexing here). Better yet, subtract the two > > tracks. If all is well the result will be zero; if they are > > misaligned, you'll get another 10k sine wave with lower amplitude. > > ... > > > > --Rob > > > Or, if you provided me with a wave file I could transmit, then I could > > provide the output back to you... > > A sine-wave is nice and simple -- do you want us to generate one? >
Nick, I am not seeing a problem. I set up a sine generator at 12807 Hz in Pro Tools on PC #1. I transmit this on 8 channels of ADAT and receive it on the HDSP 9652 in PC #2. I the record all 8 ADAT-2 channels using Audacity. The attached png file shows ADAT2, channels 1-6. As you can see, there is no offset on any of the channels. They all look identical. Channels 7 & 8 were identical also, but I cannot get them to scale down so that I could get all 8 into a single plot. I also transmitted them over ADAT back to Pro Tools and recorded all 8 channels there. All 8 channels were again identical. At least for my card I cannot see a problem. It would be difficult for me to test the other two ADAT inputs, so I'm depending (for now) on the idea that you see this problem on ADAT-1, ADAT-2 & ADAT3. I asked earlier, but I think you didn't rely, or I missed it. What firmware revision are you using on your card? I'm on firmware rev 65. (Or 101 in decimal.) Wizard root # lspci <SNIP> 00:0e.0 Multimedia audio controller: Xilinx Corporation RME Hammerfall DSP (rev 65) I hope this helps you with your debug. Good luck! Cheers, Mark
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