可変減衰等化器として用いるディジタルフィルタの設計法

概要

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The study of audio signal processing for high fidelity transmission is making a great progress as digital audio technology is prevailing. In particular, digital filters have found their effective applications where band-limiting is necessary. Whereas variable attenuation equalizers in digital design having an arbitrary frequency characteristics are often demanded. This paper describes a design of digital filters for variable attenuation equalizers. Initially, the conditions for the realization of the equalizer and the implementation of digital filter are studied in a form of simple hardware, which lead an adoption of infinite impulse response (IIR) digital filters. The transfer functions in the continuous system and in the discrete system are compared and investigated. The design methods in the continuous system for equalization is proved to be applicable to discrete systems. The three design parameters and the methods for varying frequency characteristics are proposed and examples of actual equalizers are shown. Transformation errors incurred with regard to the sampling frequencies are discussed. This approach to variable attenuation equalizers may be expected to open a new field of digital filters.
社団法人日本音響学会の論文
1980-12-25