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Compression Through Time

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1.  Which of the following is true about the propagation of sound through the middle and inner ear?
  1. The middle ear is a linear amplifier and the inner ear is a non-linear amplifier of sound.
  2. The middle ear is a non-linear amplifier and the inner ear is a linear amplifier of sound.
  3. The middle ear and inner ear are both linear amplifiers of sound.
  4. The middle and inner ear are both non-linear amplifiers of sound.
2.  Which of the following is true about the characteristics of hearing loss upon the dynamic range of hearing:
  1. The middle ear is a linear amplifier of sound; therefore conductive hearing loss will reduce the dynamic range of hearing compared to normal.
  2. The inner ear is a non-linear amplifier of sound; therefore sensorineural hearing loss will reduce the dynamic range of hearing compared to normal.
  3. The middle ear is a non-linear amplifier of sound; therefore conductive hearing loss will shift but will not reduce the dynamic range of hearing compared to normal.
  4. The inner ear is a linear amplifier of sounds; therefore sensorineural hearing loss will shift but will not reduce the dynamic range of hearing compared to normal.
3.  Linear amplification provides constant gain regardless of input level. Therefore, its graphical input-output function of gain will always be _:_ before reaching MPO.
  1. 2:1
  2. 1:2
  3. 1:1
  4. 10:1
4.  The main objectives of early Automatic Signal Processing (ASP) were to:
  1. Improve the audibility for quiet speech
  2. Reduce the upward spread of masking
  3. Restore normal loudness perception of suprathreshold sounds
  4. A & B Only
5.  The Compression Threshold, or kneepoint, refers to:
  1. The point in intensity below which the hearing instrument is in compression.
  2. The point in intensity above which the hearing instrument is in compression.
  3. The amount of time it takes for the compression circuit to activate.
  4. The amount of time it takes for the compression circuit to deactivate.
6.  The Compression Ratio refers to:
  1. The change in the input signal versus the change in the output signal.
  2. The change in the output signal versus the change in the input signal.
  3. The amount of time it takes for the compression circuit to deactivate.
  4. The amount of time it takes for the compression circuit to activate.
7.  Compression Speed refers to:
  1. The system's attack time
  2. The system's release time
  3. The system's dynamic characteristics
  4. All of the above
8.  Which of the following is NOT a goal of using Wide Dynamic Range Compression (WDRC)?
  1. To normalize loudness
  2. To enhance the signal
  3. To avoid distortion or discomfort
  4. To maintain a constant level of gain, regardless of input, until MPO is reached.
9.  In the EXPRESSfit Fitting Software, which of the following compression parameters can be changed?
  1. Compression Ratio and Compression Speed
  2. Compression Threshold and Compression Ratio
  3. Compression Threshold, Compression Ratio, and Compression Speed
  4. Compression Ratio only
10.  In the EXPRESSfit Fitting Software, how does increasing the gain for loud sounds only (80 dB input) affect the compression ratio?
  1. The Compression Ratio increases/becomes less linear.
  2. The Compression Ratio decreases/becomes more linear.
  3. The Compression Ratio stays the same.
  4. The Compression Ratio becomes negative.

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