Polyphase matrix

A polyphase matrix is a mathematical construct often used in the context of signal processing, particularly in applications involving multi-rate systems, filter banks, and wavelet transforms. The concept pertains primarily to the representation of signals and systems in terms of different phases or frequency components. ### Key Concepts: 1. **Multirate Systems:** In signal processing, multirate systems are systems that process signals at different sample rates. A polyphase matrix provides a means to efficiently implement multirate digital filters.