Companding definition

1. What do you mean by companding?
2. What are the types of companding?
3. What is companding why it is used?
4. Where is companding used?

What do you mean by companding?

What Does Companding Mean? Companding refers to a technique for compressing and then expanding (or decompressing) an analog or digital signal. It is a combination of the words "compressing" and "expanding."

What are the types of companding?

Two such logarithmic companding curves are A-law curve and µ-law curve, which differ in the slope at their origins, as shown in Figure 1. These two encoding schemes are recommended by ITU Standardization Sector for Telecommunications (ITU-T) G. 711 and are the international companding standards.

What is companding why it is used?

Companding is used to protect these small strength signals from quantization noise. Companding: Companding, also known as Companded PCM, is a non-uniform quantization technique. It is implemented to improve the signal to quantization noise ratio of weak signals.

Where is companding used?

Companding is used in digital telephony systems, compressing before input to an analog-to-digital converter, and then expanding after a digital-to-analog converter. This is equivalent to using a non-linear ADC as in a T-carrier telephone system that implements A-law or μ-law companding.