 # Signal processing

## Signal processing Topics

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### Remez algorithm

The Remez algorithm (Remez 1934), also called the Remez exchange algorithm, is an application of the Chebyshev alternation theorem that constructs the polynomial of best approximation to certain functions under a number of conditions. The Remez algorithm in effect goes a step beyond the minimax approximation algorithm to give a slightly finer solution to an approximation problem.Parks and McClellan (1972) observed that a filter of a given length with minimal ripple would have a response with the same relationship to the ideal filter that a polynomial of degree of best approximation has to a certain function, and so the Remez algorithm could be used to generate the coefficients.In this application, the algorithm is an iterative procedure consisting of two steps. One step is the determination of candidate filter coefficients from candidate "alternation frequencies," which involves solving a set of linear equations. The other..

### Average power

The average power of a complex signal as a function of time is defined aswhere is the complex modulus (Papoulis 1962, p. 240).