Howtosignalprocessing
- What is the main advantage of companding?
- What is the reason for using companding?
- What is the use of companding in PCM?
- How does companding help in improving efficiency of a system?
What is the main advantage of companding?
The use of companding allows signals with a large dynamic range to be transmitted over facilities that have a smaller dynamic range capability. Companding is employed in telephony and other audio applications such as professional wireless microphones and analog recording.
What is the reason for using companding?
Companding is used as a complement to the process of modulation and demodulation. In this process a voice signal is compressed, then changed from analog to digital, transmitted and converted back from digital to analog before it is expanded again.
What is the use of companding in PCM?
Companding in PCM
The word Companding is a combination of Compressing and Expanding, which means that it does both. This is a non-linear technique used in PCM which compresses the data at the transmitter and expands the same data at the receiver. The effects of noise and crosstalk are reduced by using this technique.
How does companding help in improving efficiency of a system?
Companding algorithms reduce the dynamic range of an audio signal. In analog systems, this can increase the signal-to-noise ratio (SNR) achieved during transmission; in the digital domain, it can reduce the quantization error (hence increasing the signal-to-quantization-noise ratio).
