Design of Wave Digital Filters with Simplified Structures


IEICE TRANSACTIONS (1976-1990)   Vol.E68   No.7   pp.441-447
Publication Date: 1985/07/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Circuit Theory

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In the design of digital filters, it is desirable to achieve lower sensitivity. Wave digital filters (WDF's) are considered one solution to this problem, and two design approaches have been proposed. However, WDF's have complicated structures compared with conventional ones. This will make it difficult to implement WDF's. The aim of this paper is to reduce the difficulty owing to the complexity of the network structures. Two kinds of simplification techniques are presented. One is to reduce the number of adders. For this purpose, new series and parallel sections and a new port matching scheme are proposed. The other is to construct WDF's using identical 3-port adaptors except the one to match the port resistance. Examples of WDF's with proposed structures are provided and the effectiveness of the proposed techniques is also shown.