Companding in pcm

1. What is companding in PCM?
2. What is companding why it is used?
3. Are the two types of companding?
4. What are the types of companding techniques?

What is companding in PCM?

For digital audio signals, companding is used in pulse code modulation (PCM). The process involves decreasing the number of bits used to record the strongest (loudest) signals. In the digital file format, companding improves the signal-to-noise ratio at reduced bit rates.

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.

Are the two types of companding?

Digital Companding involves compression in the transmitter after the input sample has been converted to a linear PCM code and then expansion in the receiver prior to PCM decoding. Digitally compressed PCM codes use a 12 –bit linear PCM code and convert into 8-bit Compressed PCM Code.

What are the types of companding techniques?

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.