A realization method and device for FIR digital filter direct-connection

Abstract

A FIR digital filer direct accomplishing method and an accomplishing device are provided, belonging to the filed of digital signal processing, comprising the following steps of: initiating the signal, and obtaining different time lag of input signal; converting fixed coefficient product, converting the product of input signal time lag and fixed filter coefficient to co-product or simple product; decomposing the co-product without similar block according to co-product decomposition rule; adding the adjacent two similar co-products according to intermediate product combination rule; adding adjacent two simple products according to intermediate product combination rule, repeating the steps of product decomposition, product combination and simple product combination and accomplishing weighing summation of the filter; obtaining the final output of the filter by regulating gain of the final simple product according to precision and gain requirement. The method and accomplishing device take full advantage of the similar and the same character of the intermediate result (intermediate product), and save quantity and bit wide of the adder for weighing summation operation, and save combined logical resource and register resource in hardware accomplishment.

Description

technical field [0001] The invention belongs to the technical field of digital signal processing, and in particular relates to a direct realization method and realization device of an FIR digital filter in a programmable logic device, a digital signal processor and an application-specific integrated circuit. Background technique [0002] In recent years, with the expansion and improvement of communication and signal processing requirements, FIR (Finite Impulse Response) digital filters have attracted more and more attention. FIR digital filters are widely used in many occasions such as audio and video signal processing and transmission, baseband shaping filtering, image filtering and matched filtering. For example, in China's national digital TV terrestrial transmission standard, the square root raised cosine roll-off FIR filter roll-off coefficient of the shaping filter is required to be 0.05, the transition band is very narrow, and the spectrum utilization rate is very hig...

AI Technical Summary

Problems solved by technology

Both the direct type and the transpose type of the traditional FIR digital filter implementation methods have the disadvantages of occupying a large amount of combinational logic resources and register resources, etc.

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