papenfuss at juneau
Feb 21, 2005, 10:00 AM
Post #2 of 2
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RE: Two mono BT8x8 cards -> one stereo in? (card 1-> L, card 2 -> R)
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On Mon, 21 Feb 2005, Johnson, Thor wrote:
> Is there a site out there that describes the necessary pins & wires?
> I'd love to do a bit of soldering to use the BTAudio instead of a
> soundcard loopback...
The datasheets for bt8xx are available online. The original
hacking data that I used is on a website that's currently down. Here's a
google cache of it:
http://64.233.161.104/search?q=cache:0CW4SPpILkwJ:www.domenech.org/bt878a-adc/+bt878a-adc&hl=en&start=2
Keep in mind that although all the bt878 chips support btaudio in
the chip itself, it's only 8-bit mono (but it will go up to a supported
448kHz sampling, 1.79MHz if you overclock the driver). The stereo
requires additional decoder chips.
If you're going to hack the card, it might be a real fun soldering
adventure. Mine actually had *no* traces on the board going to the pins
on the chip, so I had to lift the fairly fine-pitch surface-mount pin and
couple to that.
>
> (AverMedia WinTV Studio BT878 -- The one with the whine using the
> digital sound capture, no audio at all using Analog // this one is
> stereo)
>
I'm not sure how the digital vs. analog part of the btaudio works.
I've only messed with the mono analog capture.
-Cory
*************************************************************************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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