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Capture Audio from TLV320AIC3101 via ALSA

Other Parts Discussed in Thread: TLV320AIC3101

We use DM8168, DVRRDK 03.00.00.00 based software stack and Udworks based hardware design.

We try to record Audio from TLV320AIC3101. 2 single channels must be captured - not in Stereo - every channel in Mono.

I setup capture input with amixer:

 amixer sset 'Left Line1L Mux' single-ended  

amixer sset 'Right Line1R Mux' single-ended

 amixer sset 'Right PGA Mixer Mic3L' off  

amixer sset 'Right PGA Mixer Mic3R' off

 amixer sset 'Left PGA Mixer Mic3L' off  

amixer sset 'Left PGA Mixer Mic3R' off

I try capture with ALSA util:

arecord -f S16_LE -r 8000 -t raw --device=plughw:0,1 --channels=1 --separate-channels /mnt/sd1/ALSA1.pcm /mnt/sd1/ALSA2.pcm

The following problem occurs: The first file contains a mix of left and right channel the second file is OK it only contains one channel.

How can I achive single channel capture, does TLV320AIC3101 generally support the "splitting" of the stereo channel ?

 

  • Hi Holger,

    Please go through the below pointers:

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/256104.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/340262.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/282933.aspx

    http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717/t/340179.aspx

    For AIC3101 specific questions, you should use our Audio Converters forum:

    http://e2e.ti.com/support/data_converters/audio_converters/f/64.aspx

    Regards,
    Pavel

  • Hi Pavel,

    thanks for the hints.

    The problem was the impedance of audio inputs.

    For specific AIC3110 problems I will use the audio-converters forum in future.

    Best regards

    Holger.