Q1Digital Signal Processing
Question
Q.1. What is the need for multirate Signal processing?
Answer
Multirate signal processing (changing the sampling rate via decimation/interpolation) is needed to efficiently match differing sampling rates across systems, reduce computation/storage, and enable applications like sample-rate conversion and subband coding.
Multirate signal processing is needed because different parts of a system, or different applications, often operate at different sampling rates — for example, audio may be recorded at 48 kHz but needs conversion to 44.1 kHz for CD playback, or a communication system may need to reduce the sampling rate after filtering to save computation and storage without losing information (since the signal bandwidth has already been reduced). Using multirate techniques (decimation to reduce and interpolation to increase the sampling rate) rather than processing everything at a single high rate significantly reduces computational load and memory/storage requirements, and is essential for applications like sample-rate conversion between incompatible standards, efficient subband/wavelet coding, and software radio systems.