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Thread: High pitched ringing on microphone

  1. #1
    Join Date
    Oct 2007
    Beans
    16

    High pitched ringing on microphone

    Hi all,

    New HP TX2500 series (TX2530ea) laptop running 9.04 ubuntu, has a constant high pitched sound when I try to use the microphone. The microphone works, I can hear myself just behind the tone. I've tried both the inbuilt microphone and a new external one plugged into the microphone socket.

    This occurs with or without the speakers operating, and also using "arecord -f cd out.wav" and replaying.

    cat /proc/asound/card0/pcm0c/info gives this information
    card: 0
    device: 0
    subdevice: 0
    stream: CAPTURE
    id: ALC268 Analog
    name: ALC268 Analog
    subname: subdevice #0
    class: 0
    subclass: 0
    subdevices_count: 1
    subdevices_avail: 1

    and "cat /proc/asound/card0/codec#* | grep Codec" gives
    Codec: Realtek ALC268
    Codec: Motorola Si3054

    Any help appreciated

  2. #2
    Join Date
    Jun 2009
    Beans
    812

    Re: High pitched ringing on microphone

    I had 50Hz with odd overtones in my recordings on IMB notebook.

    Now, the problem is fixed.

    I just failed to understend your description of the problem.

    Try to record on battery (without AC), and offline.
    And tell the result.

  3. #3
    Join Date
    Oct 2007
    Beans
    16

    Re: High pitched ringing on microphone

    The problem (high pitched whine on audio recording made through microphone), continues despite being on battery and broadband modem disconnected.

  4. #4
    Join Date
    Jun 2009
    Beans
    812

    Re: High pitched ringing on microphone

    The same is with Dell notebook.
    The artefacts are still strong,
    even with battery, offline, and USB sound card.

    On my old IMB, I could get rid of them when
    on battery and iMic USB.

    Eventually, I removed the evil and the problem is fixed.
    But now I cannot use USB audio devices.
    It is not a big problem for me, however.

  5. #5
    Join Date
    Jun 2009
    Beans
    812

    Re: High pitched ringing on microphone

    I mean PulseAudio server.
    Now I have OSS4

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