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Questions and Answers
What is the standard form of digital audio in computers, compact discs, and digital telephony?
What is the standard form of digital audio in computers, compact discs, and digital telephony?
- A-law algorithm
- Pulse-code modulation (PCM) (correct)
- μ-law algorithm
- Linear pulse-code modulation (LPCM)
In which type of PCM are the quantization levels linearly uniform?
In which type of PCM are the quantization levels linearly uniform?
- A-law algorithm
- Non-linear pulse-code modulation (NLPCM)
- Linear pulse-code modulation (LPCM) (correct)
- μ-law algorithm
What determines the number of possible digital values in a PCM stream?
What determines the number of possible digital values in a PCM stream?
- Amplitude of the analog signal
- Sampling rate
- Quantization levels
- Bit depth (correct)
Which property of a PCM stream is defined as the number of times per second that samples are taken?
Which property of a PCM stream is defined as the number of times per second that samples are taken?
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In contrast to LPCM, which PCM encodings have quantization levels that vary as a function of amplitude?
In contrast to LPCM, which PCM encodings have quantization levels that vary as a function of amplitude?
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Study Notes
Digital Audio Standards
- The standard form of digital audio in computers, compact discs, and digital telephony is Pulse Code Modulation (PCM).
PCM Quantization
- In Linear PCM (LPCM), the quantization levels are linearly uniform.
PCM Stream Properties
- The number of possible digital values in a PCM stream is determined by the number of bits used for quantization.
- The sampling rate of a PCM stream is defined as the number of times per second that samples are taken.
Non-Linear PCM Encodings
- In contrast to LPCM, non-linear PCM encodings, such as A-law and μ-law, have quantization levels that vary as a function of amplitude.
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