Chapter Review Questions


1.

Which of the following best describes an analog waveform?

  1. A waveform represented by a series of 1s and 0s

  2. A continuously varying waveform

  3. A waveform after it passes through the G.711 CODEC

  4. A waveform after it passes through the G.729 CODEC

2.

According to the Nyquist Theorem, if you are digitizing music, and the highest frequency being sampled is 20 kHz, what is the minimum number of samples that should be taken per second?

  1. 10,000

  2. 20,000

  3. 40,000

  4. 80,000

3.

Undersampling an analog wave (that is, not taking enough samples to accurately reproduce the wave) can result in:

  1. Aliasing

  2. Glare

  3. Gaussian distribution

  4. Linear quantization

4.

G.711 is an example of which type of CODEC?

  1. PCM

  2. ADPCM

  3. CS-ACELP

  4. LD-CELP

5.

Which of the following CODECs includes VAD (Voice Activity Detection)?

  1. G.729

  2. G.729a

  3. G.729b

  4. G.711

6.

Which of the following is a voice quality measurement that uses a "trained ear?"

  1. MOS

  2. PSQM

  3. GoS

  4. PSQM

7.

The process of assigning numeric values to PAM (pulse amplitude modulation) samples is called:

  1. Aliasing

  2. Oversampling

  3. Glare

  4. Quantization

8.

A solid hour of voice conversation is the definition of which of the following terms?

  1. GoS

  2. PSQM

  3. Erlang

  4. Centum Call Second

9.

A company's monthly phone bill indicates that the company's total phone usage for the month was 10,000 minutes. Estimate the number of call minutes during the "busy hour."

  1. 68 call minutes

  2. 87 call minutes

  3. 360 call minutes

  4. 22 call minutes

10.

Which of the following CODECs produces the best voice quality?

  1. G.723

  2. G.711

  3. G.729

  4. G.726




Voice over IP First-Step
Voice over IP First-Step
ISBN: 1587201569
EAN: 2147483647
Year: 2005
Pages: 138
Authors: Kevin Wallace

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