Why non uniform quantization is needed?
Higher average signal to quantization noise power ratio than the uniform quantizer when the signal pdf is non uniform which is the case in many practical situation.
What is meant by uniform and non uniform quantization?
Uniform Quantization is the type of quantization in which the quantization levels are uniformly spaced is the Uniform Quantization. Nonuniform Quantization is the type of quantization in which the quantization levels are unequal is the Nonuniform Quantization. But, Nonuniform quantization reduces quantization error.
Where non uniform quantization is used?
A common example of this is the telephone system. Different people speak with differing amounts of loudness into the telephone. The quantizer used in the telephone system needs to be quite robust to the wide range of input variances in order to provide satisfactory service.
What is non uniform quantization in PCM?
Non- Uniform Quantizer. Uniform Quantizer: In Uniform type, the quantization levels are uniformly spaced, whereasin non-uniform type the spacing between the levels will be unequal and mostly the relation is logarithmic. Types of Uniform Quantizers: ( based on I/P – O/P Characteristics) 1. Mid-Rise type Quantizer.
What is non-uniform quantization in communication?
The type of quantization in which the quantization levels are unequal and mostly the relation between them is logarithmic, is termed as a Non-uniform Quantization. The quantization levels in this type are odd in number. Both the mid-rise and mid-tread type of uniform quantizers are symmetric about the origin.
What are different types of quantization?
There are two types of Quantization – Uniform Quantization and Non-uniform Quantization. The type of quantization in which the quantization levels are uniformly spaced is termed as a Uniform Quantization.
What does non-uniform quantization include?
Quantizers in which reconstruction and transition levels do not have even spacing is called non-uniform quantization. The notion that uniform quantizer is the optimal MMSE when is uniform suggests another approach. The nonuniform quantization by companding minimizes the distortion.