On Mar 1, 2015, at 9:51 PM, Zainab S.V <[email protected]> wrote: Hi John, Need your help again. As I said,my aim is to process distracted voice to clear voice. For this I am using beaglebone with audiocape (not yet decided if I shall use usb dongle ). What I need to know is, do I have to use an amplifier to amplify the incoming signal in addition to the cape or usb dongle? Thankyou,
For the benefit of the BeagleBoard community, please address these questions to the community and not to me personally. I have redirected my response to the BeagleBoard mailing list. For the Audio Cape, you don’t need an amplifier, but using one won’t hurt because you can reduce the gain with the codec. However, you do need to bias the microphone which needs a 2V bias with a 2k2 resistor. On the TI website, look for TLV320AIC3106EVM. You can download the User Guide which includes the board schematic. Look at how the microphone is connected. It uses the bias voltage via R7 (2k2). Unfortunately, this pin isn’t connected on the Audio Cape so all you need to do is use a 2V regulator and a 2K2 resistor to connect this to the Microphone bias pin. http://www.ti.com/lit/ug/slau209a/slau209a.pdf Regards, John On Wed, Feb 25, 2015 at 12:20 PM, Zainab S.V <[email protected]> wrote: > Thank you > > On Tue, Feb 24, 2015 at 11:53 PM, John Syne <[email protected]> wrote: > >> >> > On Feb 24, 2015, at 1:13 AM, Zainab S.V <[email protected]> wrote: >> > >> > Hi, >> > >> > >> > This is in reference to a thread in google group about beaglebone. I >> request your help in this . My project needs to input distracted voice >> (preferably, recording with mic) and wants the output as processed >> voice(with no distractions). I planned to use audio cape for this. Since I >> cannot use microphone without biasing mic voltage, now I am planning to use >> usb audio dongle (like the one as Syba audio interface). Can you please >> tell me whether I need to bias mic voltage even if I use usb audio? >> I’m not exactly sure as it depends on which USB audio adapter you are >> using. I know there are USB microphones that should work just fine. The USB >> microphones have the best signal to noise ratio >> >> Regards, >> John >> > >> > Thankyou. >> >> > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
