2008-04-25 17:23:04     Phone input on AD1981

Document created by Aaronwu Employee on Aug 6, 2013
Version 1Show Document
  • View in full screen mode

2008-04-25 17:23:04     Phone input on AD1981

Cameron Barfield (UNITED STATES)

Message: 54964    On our BF536 custom board, we're running audio to the Phone input on the AD1981.


For the life of me, I can't seem to get ALSA to accept this as the capture source.


Using amixer, I set the Phone Capture Volume to 31, the Phone Capture Switch to on, but I don't have the ability to set the Capture Source to phone. I also can't seem to find a -D value to pass to arecord to grab audio from the Phone input.


Any ideas?




2008-04-30 19:07:24     Re: Phone input on AD1981

Frank Van Hooft (CANADA)

Message: 55321    Cameron, did you find a solution to this? I'm trying to do similar things, trying to control the capture source, which the ad1981 permits with a great degree of flexibility, but I'm having trouble controlling it via the alsa driver.  I'm wondering if it wouldn't be easier to just set the ad1981 registers directly, but I'm not able to do that at the moment either. At least, I haven't worked it out yet.








2008-04-30 19:20:51     Re: Phone input on AD1981


Message: 55322   


The developer working on sound driver is on vocation. He may take a look when he is back.




2008-05-09 11:42:10     Re: Phone input on AD1981

Cameron Barfield (UNITED STATES)

Message: 55677   


I'd totally forgotten about this. Sorry, Frank.


I never did find a solution. We just switched the input source from Phone to Aux and I got it working just fine. Electrically, the Phone, Aux, and Line inputs are all the same -- at least that's how I read the datasheet.