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Linux/AM5728: Audio Call testing issue through EVM

Himani G
Intellectual 510 points

Part Number: AM5728

Tool/software: Linux

We have am5728 based EVM Revision-3 , booted with Linux with TI SDK version 05.02.00.10 . Our objective is to run audio call between a PC and EVM. Both PC and am5728 EVM are booted with Linux with TI SDK version 05.02.00.10

Experiment 1 : Audio Call testing with audio input at Line-in of EVM.

Set up Details:-

1) Line OUT port of PC is connected to Line IN port of EVM via male to male aux cable. Headphones are connected to Line OUT port of EVM.

2)pjsua binary (which is a  PJSIP console based application  to make audio/video sip calls) is installed on both PC and am5728 EVM.

3)An audio Call is made from PC to EVM (using pjsua binary) .

4)Music is played on PC using Music Player/ Youtube.

Result:- No music/sound is heard in headphones attached to EVM Line-out.

Experiment 2 : Audio Call testing with audio input at USB port of EVM

Set up Details-

1) A usb sound card is attached to one of the USB ports of the EVM and is set the default sound device.

2)Line out port of PC is connected to MIC port of USB sound card (attached to EVM) via male to male aux cable. Headphones are connected to audio out port of USB sound card.

2)pjsua binary (which is a  PJSIP console based application  to make audio/video sip calls) is installed on both PC and am5728 EVM.

3)An audio Call is made from PC to EVM (using pjsua binary) .

4)Music is played on PC using Music Player/ Youtube.

Result:- Music/sound is heard in headphones attached to USB sound card on EVM.

Query:-

During an audio call when Voice input (music played) is given on EVM Line-in , no sound is heard on connected headphone at EVM Line OUT . When same thing is repeated with USB sound card attached to USB port of EVM then Music/sound is heard in headphones attached to USB sound card on EVM.

What can be the issue the voice not heard at EVM in Experiment 1. Please Help.

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  • 0
    TI__Guru**** 393215 points

    Hi,

    Himani G said:
    Result:- No music/sound is heard in headphones attached to EVM Line-out.

    The EVM Line-out output is exactly what it says - line out. This is not a headphones output. The signal level is not enough to drive headphones.

  • 0 in reply to Biser Gatchev-XID
    Intellectual 510 points
    We have am5728based EVM Revision-3 , booted with Linux with TI SDK version
    05.02.00.10 .

    objective : To run audio call between a PC(Called Party) and EVM(Calling Party) .


    Audio Call Setup:

    1. Call is made between PC and EVM (booted with Linux TI SDK version 05.02.00.10) by
    PJSIP console based application.

    2. Audio input to EVM(Calling Party) at Line-in is given through a Line-out of another
    PC(music is played) during Call.


    Query:-

    Called Party(headphones attached to PC) receives no sound why??

    Although, if Called party (PC with USB mic)is given voice input in the same scenario
    then Calling Party (EVM) can receive the faint voice through earphones at Line-out.
  • 0 in reply to Himani G
    TI__Mastermind 30816 points
    Himani,

    Thanks for your post. Please see our Audio documentation here:

    software-dl.ti.com/.../Foundational_Components_Kernel_Drivers.html

    Focus on getting some audio playing correctly on the EVM before bringing the PC and the call software into the picture. The documentation has good instructions for this.

    Take a look at the Beagleboard-X125 and AM572x-GP-EVM section for specifics on your board. It includes instructions for how to manipulate volume via software which may be necessary due to the "line in" and "line out" design of the board.

    I hope this is helpful to you.