This paper describes a new design algorithm for finite impulse response (FIR) digital filters, which approximates constant passband amplitude and linear phase characteristics. The algorithm converts a filter's specification characteristic into a continuous impulse response by using the frequency response of a window function. The continuous impulse response is translated into discrete values to calculate tap‐gain coefficients of an FIR filter. In this design algorithm, window functions belonging to the Hanning window series (such as the Harris' window whose characteristics are already known) are used. This design algorithm is an analytical design technique, featuring a filter length that can be decided when the specification is decided and does not require iterative numerical calculations to calculate tap‐gain coefficients.

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SUMMARYA novel design algorithm is proposed for two-dimensional linear-phase FIR digital filter approximating constant amplitude over the entire passband. The design technique proposed in this paper is an analytical method in which the filter coefficients can be obtained with noniterative numerical calculation. This design technique is based on the idea that the specified filter characteristics of the filters to be realized can be made out using the frequency response of a one-dimensional window function with wellknown characteristics. In this paper, we present a number of design examples to illustrate the flexibility and effectiveness of the proposed technique as a comprehensive design technique.