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A Design Method for Single-rate FIR Digital Filter with Variable Length

A digital filter and design method technology, applied in the field of signal processing, can solve the problems of inflexible use and fixed length of FIR filter, etc., and achieve the effect of variable processing length, high calculation efficiency and strong flexibility

Active Publication Date: 2018-07-03
CNGC INST NO 206 OF CHINA ARMS IND GRP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem mainly solved by the present invention is: the FIR filter is used inflexibly due to its fixed length

Method used

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  • A Design Method for Single-rate FIR Digital Filter with Variable Length
  • A Design Method for Single-rate FIR Digital Filter with Variable Length
  • A Design Method for Single-rate FIR Digital Filter with Variable Length

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Embodiment Construction

[0035] The present invention will now be further described in conjunction with the embodiments and accompanying drawings:

[0036] see figure 1 , using m-level registers cascaded to form a delay section Rm of length m, and the relationship between its input sequence x(k) and output sequence y(k) is y(k)=x(k-m). by selector U and delay section R 1 , Rm form a feedback loop Sm with a depth of m. Where x is the data input port, e is the selector control input port, y is the data output port, the selector U outputs the upper branch when the control signal is valid, otherwise it outputs the lower branch.

[0037] see figure 2 , by selector U and delay section R m-1 , R 1 , and R with enable 1 , forming a feedback loop Tm with a depth of m. Where x is the data input port, e is the selector control input port, y is the data output port, ye is the status output port, R e1 Represents the delay section R with enable 1 .

[0038] see image 3 , assuming that the input data sy...

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Abstract

The invention relates to a length-variable single-rate FIR digital filter design method. By means of the length-variable single-rate FIR digital filter design method, the order number of a digital filter can be rapidly changed; therefore, the method is particularly applied to an occasion, in which the working frequency of the digital filter is obviously greater than the input data sampling rate and the filter coefficient length needs to be rapid; in signal processing, pulse matching compression processing of multiple signals having different time widths can be effectively completed; and thus, the length-variable single-rate FIR digital filter design method has the characteristics of being high in expansibility and universality, convenient to debug and the like.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a single-rate FIR digital filter with variable length. The invention proposes a solution to the design problem of pulse compression digital filter when various signal forms change rapidly in the existing radar digital signal processing. It has the characteristics of strong expansibility, strong versatility and high efficiency, and can be widely used in signal Processor product field. Background technique [0002] FIR digital filters are widely used in signal processors, such as low-pass filtering, pulse compression and other occasions. Use FIR filter to achieve pulse compression processing. The current FIR filter has a fixed length. If the same filter is used to process large time-width signals and hourly-width signals in time-sharing, simply using the method of replacing coefficients will lead to hourly-width signal processing. Latency increases. If two filters are us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/00
CPCH03H17/00H03H2017/0081
Inventor 徐伟
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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