Howtosignalprocessing
- What is μ-law of compression?
- What is Mu-law companding techniques?
- What is A-law and u-law in digital communication?
- What are the two laws of companding?
- What is the significance of μ in μ-law companding?
- What is the difference between u-law and A-law companding?
What is μ-law of compression?
μ-Law companding is a compression process. It explores the principle that the higher amplitudes of analog signals are compressed before ADC while expanded after digital-to-analog conversion (DAC). As studied in the linear quantizer, the quantization error is uniformly distributed.
What is Mu-law companding techniques?
The μ-law algorithm (sometimes written mu-law, often approximated as u-law) is a companding algorithm, primarily used in 8-bit PCM digital telecommunication systems in North America and Japan. It is one of two versions of the G. 711 standard from ITU-T, the other version being the similar A-law.
What is A-law and u-law in digital communication?
A-law and u-law are two algorithms that are used in modifying an input signal for digitization. These algorithms are implemented in telephony systems all over the world. The two algorithms have a fairly minimal difference and most people would not know the difference.
What are the two laws of companding?
In companding, quantization intervals increase logarithmically with an increase in the amplitude of the signal. 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.
What is the significance of μ in μ-law companding?
µ-law Companding Technique
Uniform quantization is achieved at µ = 0, where the characteristic curve is linear and there is no compression. µ-law has mid-tread at the origin. Hence, it contains a zero value. µ-law companding is used for speech and music signals.
What is the difference between u-law and A-law companding?
The μ-law algorithm provides a slightly larger dynamic range than the A-law at the cost of worse proportional distortion for small signals. By convention, A-law is used for an international connection if at least one country uses it.
