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Length-variable single-rate FIR digital filter design method

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

Active Publication Date: 2016-10-26
CNGC INST NO 206 OF CHINA ARMS IND GRP
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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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  • Length-variable single-rate FIR digital filter design method
  • Length-variable single-rate FIR digital filter design method
  • Length-variable single-rate FIR digital filter design method

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Embodiment Construction

[0035] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0036] see figure 1 , using m-level register cascading to form a delay section Rm with a length of m, the relationship between its input sequence x(k) and output sequence y(k) is y(k)=x(k-m). A feedback loop Sm with a depth of m is composed of selector U and delay nodes R1 and Rm. Among them, 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 , a feedback loop Tm with a depth of m is composed of selector U, delay nodes Rm-1, R1, and R1 with enable terminal. Among them, x is the data input port, e is the selector control input port, y is the data output port, ye is the state output port, and Re1 represents the delay node R1 with the enable end.

[0038] see image 3 , assuming that the ...

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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 variable-length single-rate FIR digital filter. This invention proposes a solution to the design problem of pulse compression digital filter when various signal forms change rapidly in existing radar digital signal processing. It has the characteristics of strong scalability, 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. Due to the fixed length of the current FIR filter, if the same filter is used to process large time-width signals and hour-wide signals in time, simply using the method of replacing coefficients will result in hour-wide signal processing. Latency increases. If two filters are used to process ...

Claims

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Application Information

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Patent Type & Authority Applications(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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