A design method for approximately linear phase narrow-band and highpass FIR filters is presented. Also an efficient filter structure is introduced for realizing the designed filters. The structure is based on a cascade of linear and nonlinear phase FIR filters having transfer functions expressable as integer powers of the unit delay. The overall implementation requires significantly less multiplications than conventional direct form FIR filters. Moreover, the delay of the filters is only fractions of what can be attained using pure linear-phase FIR filters. It is shown by means of an example that the design method and realization results in virtually linear phase FIR highpass filters which are computationally efficient and have short response times.
NASA STI/Recon Technical Report N
- Pub Date:
- Fir Filters;
- Structural Design;
- Transfer Functions;
- Electronics and Electrical Engineering