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Attacking the Noise Problem: Current Approaches

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1.  Settings that include human voices:
  1. Are considered as pleasant most of the time by those with normal hearing
  2. Are the most common source of problems for those with hearing loss
  3. Are perceived differently than technology-based sounds
  4. All of the above
2.  The cancellation techniques used in noise reduction headsets:
  1. Is the same as those used in hearing aids
  2. Are based on assumptions that cannot be met in the hearing aid situation
  3. Don't actually exist
  4. None of the above
3.  Spectral Subtraction:
  1. Describes the general approach to noise reduction used in hearing aids
  2. Is the same as spatial subtraction
  3. Is only used in advanced cell phones
  4. Is the same as what we call directionality
4.  Modulation Analysis:
  1. Is used to cancel feedback
  2. Determines the direction from which noise arises
  3. Analyzes whether or not the waveform changes in level over time in a manner similar to the speech signal
  4. None of the above
5.  Noise reduction in hearing aids:
  1. Can eliminate noise and leave the speech signal intact
  2. Makes noisier situation more difficult to manage
  3. Reduces only noises that include speech
  4. None of the above
6.  Adaptive polar plots:
  1. Only adjust if the competition is speech
  2. Adjust to reduce the total SPL of signals coming from the backs and sides
  3. Are directed by the user's remote control
  4. All of the above
7.  Directionality in hearing aids:
  1. Is preferred by users to be active all of the time
  2. Works best when reverberation is high
  3. Works only when competing speech is coming from behind
  4. None of the above
8.  Automatic Directionality in hearing aids is typically active:
  1. Over 80% of the time
  2. About 66% of the time
  3. About 50% of the time
  4. Less than 30% of the time
9.  Completion approaches assume:
  1. The brain will use as much information as it can get
  2. Hearing aids traditionally have disrupted certain natural cues
  3. Try to capture as much detail of the incoming signal as possible
  4. All of the above
10.  Localization cues in hearing aids:
  1. Can be disrupted with compression acting independently on the two ears
  2. Are lost because of digitization
  3. Rely completely on noise reduction being disabled
  4. None of the above