Processing method, device and system of FIR (finite impulse response) filter

A processing method and filter coefficient technology, applied in the field of communication, can solve the problems of high cost and power consumption, large logic occupation, low processing efficiency, etc., and achieve the effects of saving resources, real-time filtering, and reducing power consumption

Inactive Publication Date: 2012-10-17
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] During the research and practice of the prior art, the inventor of the present invention found that the FIR filter in the prior art needs to buffer the input data, and the multiplier and the adder filter the input signal in parallel, when When the input signal has a large bit width and a large number of orders, the processing efficiency is low, and a large amount of logic is required, and the cost and power consumption are high.

Method used

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  • Processing method, device and system of FIR (finite impulse response) filter
  • Processing method, device and system of FIR (finite impulse response) filter
  • Processing method, device and system of FIR (finite impulse response) filter

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Embodiment 1

[0044] This embodiment will be described from the perspective of a filtering device, wherein the filtering device can be an N-order, the input signal is M bits, and the filter coefficient b i A FIR filter whose quantization precision is X bits (hereinafter referred to as FIR filter). It should be noted that the transfer function of the FIR filter in this embodiment can be expressed as:

[0045] H ( z ) = Σ i = 0 N b i z - i ;

[0046] Among them, b i is the filter coefficient, N is the order of the FIR filter, z -i is the input signal data.

[0047] A processing method of an FIR filter, comprising:

[0048] First obtain the input signal, and store the obtained input signal in the memory of the FIR fi...

Embodiment 2

[0092] In order to better implement the above method, the embodiment of the present invention also provides a corresponding filtering device. As a device for implementing the method in the embodiment of the present invention, the filtering device may specifically include a first acquisition unit 201, a storage unit 202, a read unit 203 , a second acquisition unit 204 , a multiplication unit 205 , an addition unit 206 and an output unit 207 . see image 3 :

[0093] The first acquiring unit 201 is configured to acquire an input signal. Wherein, the filter device in this embodiment generally has two ports, one port is used to obtain the input signal, and the other port is used to output the signal, therefore, one port of the filter device can be used to obtain the input signal.

[0094] The storage unit 202 is configured to store the input signal acquired by the first acquisition unit 201 in the memory SRAM of the FIR filter, so that each input signal can obtain N+1 signal dat...

Embodiment 3

[0111] Correspondingly, an embodiment of the present invention also provides a filtering system, wherein the filtering system includes a filtering device.

[0112] Wherein, the filter device is used to obtain the input signal, and store the input signal in the SRAM of the FIR filter, so that each input signal can obtain N+1 signal data, and N is the maximum order of the FIR filter, sequentially from the SRAM Read the N+1 signal data corresponding to an input signal, and update the read mark every time a signal data is read out, obtain the filter coefficient corresponding to the current signal data according to the read mark, and combine the current signal data with the acquired Multiply the obtained filter coefficients to obtain the multiplication result of the current signal data, and accumulate the multiplication results obtained from the N+1 signal data corresponding to an input signal to obtain the addition result and output it.

[0113] It should be noted that the filteri...

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Abstract

The embodiment of the invention discloses a processing method, a device and a system of an FIR (finite impulse response) filter. The processing method comprises the following steps: obtaining input signals, storing the input signals in an SRAM (static random access memory) of the FIR filter to enable each input signal to obtain N+1 signal data, then sequentially reading out the N+1 signal data corresponding to one input signal from the SRAM, updating a reading identification once when reading out one signal datum, obtaining a filter coefficient corresponding to the current signal datum according to the reading identification, conducting multiplication of the current signal datum and the obtained filter coefficient to obtain a multiplication result of the current signal datum, accumulating the multiplication results obtained by the N+1 signal data corresponding to one input signal to obtain an addition result, and outputting the addition result. Efficient real-time filtering can be realized so as to save resources and reduce the power consumption.

Description

technical field [0001] The present invention relates to the communication field, in particular to a processing method, device and system of an FIR filter. Background technique [0002] Finite Impulse Response (FIR, Finite Impulse Response) filters are the most basic components in digital signal processing systems. At present, in digital communication systems, more and more FIR filters are used to achieve digital signal filtering. FIR filters have It has obvious advantages such as stability and strict linear phase-frequency characteristics, and its transfer function can be expressed as: [0003] H ( z ) = Σ i = 0 N b i z - i ; [0004] Among them, b i is the filter coefficient, N is the order of the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H17/02
Inventor 吴德亮
Owner HUAWEI TECH CO LTD
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