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Issue - USB powered GSM Modem's Audio Out to PC's Mic

Discussion in 'Audio' started by scurrminator, Dec 13, 2011.

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  1. scurrminator


    Dec 13, 2011
    I am trying to record audio from the Usb powered GSM Modem's Audio Out Pin using my PC. I have used a 2.5mm to 3.5mm audio jack feeding Modem's Audio to the PC Mic interface. But I am hearing the EMI noise that usually generated when you bring your mobile in a call to an unsheilded speaker system.
    The system works well when I attach my mobile handset to the 2.5mm end of the audio adaptor and I am able to record clear audio. The issue arises when I use the gsm modem which is powered from the same PC and feed its audio to the PC Line In or the Mic. The modem I am using is Samba 55. The last image is the adapter connected to the mobile phone, works well and i am able to record clear sound. Can any one suggest how can i remove the EMI noise?

  2. davenn

    davenn Moderator

    Sep 5, 2009
    welcome to the forums :)

    so what happens when you plug earphones into the samba, do you get clear audio ?

    if not then maybe there's some settings in the software you need to change

  3. scurrminator


    Dec 13, 2011
    yes, i am able to hear clear audio with headfone connected to samba. the only issue arises when i input samba's audio out to pc line in. there is this generic gsm emi noise as i told earlier
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