Question:
Companding is used in PCM in order to ________.
Companding is used in PCM in order to ________.
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Companding improves SNR for small signals by redistributing quantization levels non-uniformly.
Updated On: Jun 23, 2025
- keep the quantization noise low for low-amplitude segments of a signal
- avoid quantization noise
- reduce the effect of impulse or channel noise
- reduce the complexity of the PCM system
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The Correct Option is A
Solution and Explanation
Companding (Compression + Expanding) is a nonlinear technique used in PCM systems to:
- Apply a nonlinear transformation before quantization (compression).
- Reverse the transformation at the receiver (expanding).
Purpose: - Low amplitude signals get more quantization levels → lower noise.
- High amplitude signals get fewer levels but already have higher energy → noise less noticeable.
Common companding laws:
- μ-law (used in North America)
- A-law (used in Europe)
- Apply a nonlinear transformation before quantization (compression).
- Reverse the transformation at the receiver (expanding).
Purpose: - Low amplitude signals get more quantization levels → lower noise.
- High amplitude signals get fewer levels but already have higher energy → noise less noticeable.
Common companding laws:
- μ-law (used in North America)
- A-law (used in Europe)
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