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Method and device for implementing bandpass filtering using cascade integration comb filter

A cascaded integral comb and band-pass filtering technology, which is applied in the direction of electrical components, digital technology networks, impedance networks, etc., can solve the problems of band-pass filtering occupying a lot of resources, large processing delay, and long delay, etc., to reduce Resource usage, reduced storage, and small storage effects

Inactive Publication Date: 2008-03-05
ZTE INTELLIGENT IOT TECH
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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a method for realizing band-pass filtering by cascaded integral comb filter, which can solve the problem that the band-pass filtering function occupies more resources and has a large processing time delay in the prior art. It achieves the effect of reducing resource usage and reducing the delay in the signal processing process
[0006] Another object of the present invention is to provide a device that utilizes cascaded integral comb filters to realize band-pass filtering, which can solve the problems of complex structure of FIR filters, need for a large number of multipliers, and large time delay

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  • Method and device for implementing bandpass filtering using cascade integration comb filter
  • Method and device for implementing bandpass filtering using cascade integration comb filter
  • Method and device for implementing bandpass filtering using cascade integration comb filter

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The core idea of ​​the present invention is: use two CIC filters to process the same signal, specifically, use the signal that needs to be band-pass filtered as two input signals, perform low-pass filtering on each input signal and signal time delay and gain adjustment, and cancel the processed two signals.

[0033] Among them, the signal that needs to be band-pass filtered in each channel can first be low-pass filtered or the delay and gain adjustment of the signal can be selected arbitrarily. It can be low-pass filtered first, and then the delay and gain can be adjusted; You can adjust the delay and gain first, and then pass the low-pass filter.

[0034] As an embodiment of the present invention, the signal is selected to be low-pass filtered first, and then the time delay and gain are adjusted.

[0035] As shown in Figure ...

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Abstract

This invention discloses a method for realizing bandpass filtration utilizing two cascade integral comb filters of different cut-off frequencies, which takes signals necessary for bandpass filtration as two paths of input signals to carry out low pass filtration and adjustment to time delay and gain of them then to cancel the processed signals. This invention also discloses a device for realizing bandpass filtration by two cascade integral comb filters.

Description

technical field [0001] The invention relates to digital filter technology, in particular to a method and device for realizing band-pass filtering by cascaded integral comb filters. Background technique [0002] The function of digital filtering is to filter out a certain frequency component in the signal. After the signal is filtered, it is equivalent to the result of multiplying the signal spectrum and the frequency response of the filter. From the time domain point of view, it is the convolution sum of the input signal and the impulse response of the filter. In a digital communication system, in order to demodulate a signal, it is necessary to digitally filter the signal to reduce the influence of noise and interference on the signal. Among them, in the application field of zero-IF system, since the sampling frequency of the baseband signal is much higher than the effective bandwidth of the signal, it is generally necessary to add a cascade integrator-comb filter (CIC, Ca...

Claims

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Application Information

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IPC IPC(8): H03H17/02
Inventor 曾祥希
Owner ZTE INTELLIGENT IOT TECH
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