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Understanding Compression - Some of the Finer Points

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1.  Which of the following is a FALSE statement about AGCi?
  1. When a low kneepoint is used, results in increased audibility for soft sounds
  2. Can be used to control maximum output
  3. Results in a decrease in gain when input increases
  4. Commonly, a kneepoint in the 60-80 dB SPL range is used
2.  Which of the following is a false statement about AGCo?
  1. The setting of the AGCo kneepoint should correspond with the patient's LDL
  2. An AGCo setting that is too low can reduce the dynamics of speech
  3. A common ratio for AGCo is 10:1
  4. A common kneepoint for AGCo is 60-80 dB SPL
3.  A fairly common compression attack time for AGCi is:
  1. 5-10 msec
  2. 500 to 2000 msec
  3. 5 to 10 seconds
  4. >10 seconds
4.  A fairly common compression release time for AGCi is:
  1. 5-10 msec
  2. 100-150 msec
  3. 1000 to 5000 msec
  4. >10 seconds
5.  A reported advantage of a short release time is:
  1. Greater audibility of soft syllables in ongoing speech
  2. Average speech sounding more natural
  3. 20-30% improvement of speech understanding in background noise
  4. Loud sounds are not uncomfortably loud
6.  A reported advantage of a long release time is:
  1. Greater audibility of soft syllables in ongoing speech
  2. Average speech sounding more natural
  3. 20-30% improvement of speech understanding in background noise
  4. Loud sounds are not uncomfortably loud
7.  Regarding expansion, a common kneepoint in the low frequencies would be:
  1. 10-20 dB SPL
  2. 40-50 dB SPL
  3. 70-80 dB SPL
  4. 100-110 dB SPL
8.  A potential problem that could result if you set the expansion kneepoint too high would be that:
  1. Average-level speech would be distorted
  2. Soft-level speech might not be audible
  3. Loud sounds would exceed the patient's LDL
  4. All of the above
9.  If a patient said that soft sounds were "just right," but average and loud sounds were not loud enough, a reasonable adjustment would be to:
  1. Turn up overall gain
  2. Make the AGCi kneepoint lower
  3. Make the AGCi compression ratio smaller (e.g., change from 3:1 to 2:1)
  4. Make the AGCi compression ratio bigger (e.g., change from 2:1 to 3:1)
10.  In general, a person with a small dynamic range will need:
  1. A lower AGCi kneepoint
  2. A higher AGCi kneepoint
  3. A smaller AGCi ratio
  4. A larger AGCi ratio