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    Frequency Filtered sound for testing difficult babies and infants hearing in Audiology


    Hi

    I am an Audiologist who does baby and toddler testing. We often use a test called VRA test to assess hearing across main frequency bands 0.5 to 4 kHz. An adult can usually respond to a pure sine tone at each discreet frequency and we use this to determine the hearing loss, decide management and set hearing aid prescriptions. With children and those with additional needs such as Autism they may only respond to more relevent and interesting sounds. I am trying to create this with Sound Forge using synthesized sound but struggling as this is definitely not my area of expertise.

    Would it be possible for me to learn from someone, how to edit sounds and filter frequency bands from a pro?

    If anyone else has sounds such as
    1. music (in bands 0.5 to 1 kHz, 1-1.5 kHz, 1.5 to 2 kHz and half octave around 3 and 4 kHz I would be grateful. chimes, bells, tambourine and high frequncy rattles,
    2. animal sounds like geese, bird, and mouse (eee),
    3. Our Ling Sound test for speech sounds ah, ee, uu (owl), sh (baby sleeping), ss (snake)
    4. Environmental sound like door bell,snore, whistle, bark, police car, rain, clap

    5. Other sounds I am wanting to edit are action sounds, like you would hearing in children videos/movies, laugh, plop, and slurp, Weeeeh (when you going down a slide), Woh (to express shock), woo (disappointment), aha, mmm (agreement), Woah! (happy ).
    6. The last sound I want to create in notch filtered NBN in each frequency band.

    All these sounds will not be completely specific to a frequncy band but using it based on the child's capabilities might go a long way to help assess hearing in our difficult cases and speed up their management.

    If you are interested in helping please let me know via this forum.
    I woudl be grateful for any help.

    Cheers,
    Kaj

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    KajRam wrote:
    1. music (in bands 0.5 to 1 kHz, 1-1.5 kHz, 1.5 to 2 kHz and half octave around 3 and 4 kHz ...

    Music in 500Hz bands rapidly becomes unpleasant ...


    https://freesound.org/people/Timbre/sounds/519673/

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    If you limit the frequencies to such a narrow band, you no longer have the "interesting" sound you started with (unfortunately). Narrow enough and you just have a fuzzy sine tone. You might try just having an wavering (FM) sine within each band of interest, perhaps with a change to the speed of modulation and/or the carrier tone itself. Plus, some reverse echo/reverb might make it odd enough to catch attention.

    -- Keith W. Blackwell
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    Thinking about that, I thought it should be fairly easy to put together an analog box circuit to generate the warbles I had in mind, so I just went ahead and did it. Then I used Cool Edit Pro to FFT filter each piece to ensure it stayed within its band. The result is upload as this sound: TestWhinnies (I called them "whinnies" because at certain speeds and frequencies they started out sounding like a horse whinny). If it's of interest, KajRam, I could supply the analog box file and you could modify all the parameters to your liking.

    -- Keith W. Blackwell

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