Method for implementing digit filter group structure

Abstract

The digital filter combination structure includes input signal selecting unit, filter combination unit and frequency band selecting unit; and has combined discrete sampling multiple rate system and distributive mathematical algorithm. The discrete sampling multiple rate system operates on discrete sampling principle and has dendritic structure, time division multiplexing and circulative feedbackto reduce hardware size of the digital filter combination structure. The digital filter combination with distributive mathematical algorithm, table look-up technique and hardware with memory is usedin processing language, music tone, image, etc.

Description

[0001] This application is a divisional application of an invention patent application with an application date of May 15, 1996, an application number of 96107412.4, and an invention title of "Digital Filter Bank Structure and Implementation Method". technical field [0002] The present invention relates to an implementation method of a digital filter bank structure, in particular to a combination of a Decimation in Multi-Rate System (Decimation in Multi-Rate System) and a Distributed Arithmatic Algorithm (Distributed Arithmatic Algorithm). An implementation method for realizing a digital filter bank structure of reduced size area. Background technique [0003] Generally, speech, audio and video processing often use filter banks to divide an external input signal into several narrow-band signal groups. These narrow-band signal groups have different algorithms (Algorithms) corresponding to different applications, such as music compression, synthesis, or speech recognition. T...

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Problems solved by technology

[0012] Among them, it is known from the above relational expression that if the expansion of its product term and addition is simply realized by hardware, the structure will inevitably require many multipliers, adders and shift registers, and the number will vary with the order of the digital filter. Increase and increase linearly. When these digital filters are combined into a digital filter bank and applied to the processing of voice, music and video, once the number of filters in the filter bank is required to increase, That is, if the number of divided frequency spectrums increases, a large number of multipliers, adders, and shift registers will be generated. Such a huge hardware is quite uneconomical from the point of view of integrated circuits.

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