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    Posted April 1, 2014 by
    PaulGinsberg
    Location
    Park Ridge, New Jersey

    What INvestigators Can LEarn from MH-370 Communications

     
    PROFESSIONAL AUDIO LABORATORIES
    311 Chelsea Manor
    Park Ridge, NJ 07656
    PAUL GINSBERG (201) 664-8333
    PRESIDENT www.proaudiolabs.com fax (201) 746-0695


    Paul Ginsberg is a recognized forensic audio expert who has analyzed and enhanced thousands of recordings, including air and rail “black-box” recordings in his 40-year career. He shares his thoughts on MH-370 transmissions and cockpit recordings

    Mr. Ginsberg is available to discuss the various information that can be extracted from analysis of these recordings. For more information see website at www.proaudiolabs.com or call (914) 263-8010



    What Investigators Can Learn From MH-370
    Radio Transmissions


    1. The actual words spoken
    (using enhancement and digital slowing)

    2. Identity of speaker (very brief samples, useful if two voices
    are different in tone, inflection, speed of speech, accent)

    3. Possible emotion state of crew (whether calm or excited)
    (can hear deep breaths in cases of anxiety)

    4. Voice(s) steady or wavering from vibration of aircraft

    5. Additional voices (from other pilot’s mic or in background)

    6. Any alarms sounding (various instruments emit unique
    alarm sounds to alert crew to various conditions)

    7. Condition of on-board power supply from analysis of hum
    component of signal by spectrographic analysis

    8. Condition of radio (distorted or clear, weak or strong audio)


    What Investigators Can Learn From MH-370
    Cockpit Voice Recorder

    The cockpit voice recorder generally has four voice channels: pilot, co-pilot, CAM (cockpit area microphone) and intercom.

    All of the information described above, applies, along with the added intelligence from each of the channels.

    Investigators use all of the channels to identify all spoken words, and cockpit sounds during an investigation.

    Assuming the proper installation and alignment of the Cockpit Voice Recorder (CVR) one can even identify directionality of various cockpit sounds, as in the case of a malfunctioning engine on one side of the aircraft. And identification of speakers is definite because pilot and co-pilot are recorded in separate channels.

    Engine sounds can pinpoint when throttle is increased or decreased.

    Alarm sounds are audible, as is the sound of a stick-shaker, for example, in the case of an impending stall.














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