Hearing Instruments IIHIS Unit 3

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  1. Propagated change or disturbance in the density, and there fore in the pressure, of an elastic medium?
  2. Sound waves that travel in expanding spheres (or shells) in the same direction as the vibrating body?
    Longitudinal Waves
  3. The two chief sources of sound?
    • A vibrating body
    • throttled or modified air stream
  4. A pure tone with uncomplicated alternations of compression and rarefaction?
    Sine Wave
  5. The vertical axis of a Sine Wave shows what?
    Amplitude or Loudness
  6. The horizontal axis of a Sine Wave shows?
    Time Elapsed
  7. The number of times a vibrating body completes a pattern of complete cycles of compression and rarefaction per second are called?
  8. Time required for one complete cycle of compression and rarefaction?
  9. Graphically describes the intensity of the energy a vibrating body delivers?
  10. Speed of sound?
    Sound waves travel at 1,100 ft per second
  11. Distance covered by one complete cycle of a wave?
  12. What effects does temperature have on sound?
    The higher the temp the faster sound travels
  13. Sounds reflecting, leaving a persistence of sound after the sound ceases?
  14. Sound reflection heard separately from the original sound?
  15. Difference between the actual pressure at any point in a sound wave at any instant, and the average pressure at that point?
    Sound pressure
  16. When a sound wave begins at 0° or ends at 360°
  17. When the sound reaches one ear before the other, slightly out of phase we determine?
  18. What is it when two tones of almost identical frequency combine and you hear a noticeable increase and decrease in the tone?
  19. Complex sounds that repeat themselves slowly over time like music and speech?
    Periodic Waves
  20. Complex sounds without a period or pattern?
    Aperiodic Waves
  21. The measured force or power of the pressure changes of sound?
    Intensity Level
  22. Compares the loudness level of a sound at one frequency to the same loudness at another frequency?
  23. A subjective unit of loudness that uses the average normal judgments of loudness going up frequency, not across?
  24. The physical measurement in Hz, or cycles per second, related to the listeners interpretation of pitch?
  25. Pitch is measured in?
  26. Relatively narrow bands of nearly the same frequency become one pitch, there are 22 narrow bands in the mid frequencies that are called?
    Critical Bands
  27. Critical bands of frequency can be come widened and impaired in the cochlea, giving the hearing impaired person?
    Reduced Frequency Resolution
  28. The involuntary tendency of a speaker to raise ones voice in the presences loud noise to enhance the audibility of their voice?
    Lombard Effect
  29. The base frequency of an individuals speech, for men it's between 120-250Hz and women it's between 210-325Hz?
    Fundamental Frequency
  30. In speech, vocal folds setup secondary vibrations which reinforce some frequencies are called?
  31. The reinforced frequencies of speech are called?
  32. Speech requires a balance between vowels, consonants and this to be intelligible, the moving of energy peaks from one frequency to another?
    Formant Transition
  33. When fitting a hearing instrument, either the instrument itself or an earmold blocks off the ear canal causing a loss of ear resonance?
    Insertion Loss
  34. The fitting method of dividing, adding or multiplying factors, based on audiometric hearing loss at each frequency?
    Prescriptive Method
  35. The fitting method of comparing one product, slope, frequency, output or other measurement with another is?
    Comparative Method
  36. This Comparative Fitting Method emphasizes speech discrimination scores in quiet and noise, and aided SRT and tolerance thresholds?
    Carhart Procedure
  37. This Comparative Fitting Method  involved providing enough gain at each frequency to correct the pure tone sensitivity to normal?
    Mirroring the Audiogram
  38. This Comparative Fitting Method finds the MCL for a 1000Hz  tone, the finds the intensity required to match this loudness at specific frequencies?
    Equal Loudness Contours
  39. This Comparative Fitting Method finds the midpoint of the dynamic range between 1000 - 4000Hz, using the difference between UCL-SRT?
    Bisection Procedure
  40. This Comparative Fitting Method measures threshold, MCL and UCL at each frequency, using a damped wave train in SPL instead of pure tones?
  41. This Prescriptive Fitting Method uses a formula to give a practical general guideline, suggesting the gain requirements to reach MCL through the HI at approximately one-half the pure tone threshold?
    Half Gain Formula
  42. This Prescriptive Fitting Methodn uses 1/3 of the pure tone thresholds minus 5dB at 250Hz and 3dB at 500Hz
    Libby Procedure
  43. This Prescriptive Fitting Method uses 1/3 the pure tone thresholds at 500Hz and 1/2 at 1000-4000Hz?
    Lybarger Method
  44. This Prescriptive Fitting Method selects the frequency-gain characteristics of the instrument so amplified conversational speech falls in the middle of the dynamic range?
    Skinner Procedure for Ski-Slope Losses
  45. This Prescriptive Fitting Method uses UCL and instrument correction factors to amplify louder speech sounds without distortion
    Berger Procedure
  46. When the head blocks sound arriving from the unamplified side, causing high frequency attenuation?
    Head Shadow Effect
  47. When the ear loses is ability to discriminate words because of the prolonged lack of use of amplification?
    Auditory Deprivation
  48. This type of Fitting uses a body worn hearing instrument and a Y-cord connected to a receiver in each ear?
  49. This type of fitting uses a complete hearing instrument on the better ear and a second microphone on  the non-functional ear?
  50. Seven reasons an ear can not be aided?
    • Loss greater then the maximum amplification of the instruments
    • Severe or Profound Mixed Loss
    • Abnormally small dynamic range
    • Abnormally low UCL
    • Very poor discrimination that degrades the better ear
    • Ear under medical treatment
    • Doctor recommends that amplificaton be avoided
  51. The effect caused by when an aid is in place and the patient perceives their own voice being louder, scratchy and unpleasant?
    Occlusion Effect
  52. In a hearing instrument what does the microphone do?
    Receives sound and transduces acoustic energy into electrical energy
  53. In a hearing instrument what does the receiver do?
    Receives the electrical energy from the receiver and transduces it back to acoustic energy.
  54. The flow of electrons from atom to atom is called?
  55. Electrical current is measured in what?
    Amperes (amps)
  56. Electrons move freely through materials like copper, gold, silver and aluminum which are?
  57. This device only allows electrons to move under certain conditions such as if heat, light or an electrical field are applied?
  58. In a Hearing Instrument the great the flow of current produces more?
    Volume and Intensity
  59. The Hearing Instrument battery provides the power source to increase the flow of current. The strength of the battery is measured in?
  60. A battery generates this which always flows in on direction to the positive terminal?
    Direct Current
  61. This type of current is created when electrons flow to the positive terminal until it is no longer positive.  The side that was negative lost all of its electrons making it positive causing the electrons to flow back?
    Alternating Current
  62. This restricts electron movement causing electrical friction between moving electrons and the stationary atom, which causes heat?
  63. Electrical resistance is measured in?
  64. Electrical current or sound pressure is directly proportional to what?
    Size of the voltage (battery)
  65. Electrical current is inversely proportional to the?
    Resistance of a wire or tubing (larger wire/tube less current)
  66. Resistance is directly proportional to?
    Length of a wire/tubing
  67. Resistance caused by a longer wire/tubing emphasizes which frequencies?
  68. Resistance caused by a shorter wire/tubing emphasizes which frequencies?
  69. Resistance is inversely proportional to its?
    Cross-sectional area (width); Thicker wires or wider tubes offer less resistance
  70. What effect does a capacitor have on frequency?
    • Passes the high frequencies
    • Blocks the low frequencies
  71. What effect does an inductor have on frequency?
    • Passes the low frequencies
    • Blocks the high frequencies
  72. The type of microphone used in an HI is a permanently polarized material, that has a wide, flat frequency response, with excellent sensitivity and durability?
    Electret Microphone
  73. The Electret Microphone is what type of directional microphone?
  74. These increase the strength of the electrical impulses from the microphone?
  75. This HI feature is a magnetic induction coil that responds to magnetic leakage from phones or induction loop systems?
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Hearing Instruments IIHIS Unit 3
Hearing Instruments IIHIS Unit 3
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