Algorithms for Computer Aided Design of Digital Filters
Abstract
The algorithms necessary for the computer aided design of digital filters from lowpass prototypes has been developed and compared, then implemented in a computer program to aid in the instruction of digital filter design. The procedure for the design of lowpass, highpass, bandpass, and bandstop digital filters from lowpass prototypes is well established, and is based on transforming the prototype frequency response to meet desired characteristics. This transformation can be accomplished in either the analog (s) domain or the digital (z) domain. Therefore, the two classical design techniques, analog-digital and digital-digital design, are based on doing the frequency response transformations in their respective analog or digital domains. Since the theory for the standard filter types (Butterworth, Chebyshev, and elliptic) is developed in the analog or 's' domain, the two methods for designing digital filters differ basically in the sequence of the design steps. In the analog-digital method the analog prototype is transformed and then digitized, while in the digital-digital method the analog prototype is digitized and then transformed. Keywords: Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1988
- Accession Number
- ADA208485
Entities
People
- Thomas H. Rich
Organizations
- Naval Postgraduate School