Broadband bandpass filter system and method

A band-pass filter and band-pass filtering technology, which is applied in the field of communication, can solve the problems of dynamic modulation of fundamental signal, large amount of calculation, frequency offset, etc., and achieve the effects of reducing error rate, high accuracy and reducing distortion

Inactive Publication Date: 2020-09-22
HANGZHOU LEGEND INTELLIGENT EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these algorithms face the disadvantages of excessive calculation and need to know more broadband information in the calculation process, which makes it difficult to apply the improved phasor algorithm in the actual network
Some scholars have proposed to use digital filters to improve the accuracy of phasor calculations, but most of the problems they face are in the case of dynamic modulation or frequency offset of the fundamental signal, and there is no discussion on the use of digital filters to improve phasor accuracy in the case of inter-harmonics. plan

Method used

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  • Broadband bandpass filter system and method
  • Broadband bandpass filter system and method
  • Broadband bandpass filter system and method

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Experimental program
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Embodiment 1

[0031] Such as figure 1 As shown, the broadband bandpass filter system, the system includes: a sampling unit, used to collect the original signal; a bandpass filter unit, used to extract the fundamental wave signal of the signal; a zero phase filter unit, used to receive the first bandpass The output signal of the filter unit, and perform secondary filtering to it; the first control unit is used to fit the amplitude-frequency characteristic curve of the fundamental wave filter unit, obtain the relationship between the amplitude gain and frequency, and perform amplitude compensation; It is characterized in that the system further includes: a signal preprocessing unit; the signal preprocessing unit is arranged between the sampling unit and the bandpass filter unit; the signal preprocessing unit preprocesses the original signal to obtain a preprocessed signal, The preprocessing signal is sent to the bandpass filtering unit; the signal preprocessing unit performs differential freq...

Embodiment 2

[0034] On the basis of the previous embodiment, the difference sequence is: S n+1 =cos(sinωarccos(S n )),-1n n is = 0.65, given the first seed S 0 =5, generate a differential sequence; on this basis, according to the formula: s(t)=Acos(sinω0t+cosB∫c(t)dt), wherein, the differential frequency modulation method of 0≤t≤T generates a differential frequency modulation signal, the parameters T, ω0, B and N can be adjusted according to the actual communication rate, bit error rate and communication distance. The values ​​are: the signal time length T is between 2.0s and 10.0s, the center frequency B is between 60 Hz and 290 Hz, and the difference sequence length N is between 75 and 4100.

[0035] Specifically, such as image 3 It can be seen from the schematic diagram of the noise distribution that the frequency and amplitude of the noise distribution are concentrated in a certain range. And through Figure 4 It can be seen from the schematic diagram of the frequency response of...

Embodiment 3

[0037] On the basis of the previous embodiment, the system also includes: a low-order harmonic band-pass filter unit, used to extract the 2-5 harmonics in the pre-processed signal; a second control unit, used to filter the low-order harmonic The amplitude-frequency characteristic curve of the band-pass filter unit is fitted to obtain the relationship between the amplitude gain and frequency, and the amplitude compensation is performed; the Chebyshev II filter unit is used to extract the 6th and above harmonics in the preprocessed signal .

[0038] Such as Figure 5 and Figure 7 shown. There is a certain error between the band-pass filtered signal and the original signal. By fitting the amplitude-frequency characteristic curve of the fundamental wave filter unit, the relationship between the amplitude gain and the frequency is obtained, and the amplitude compensation can significantly reduce the occurrence of this error. Simultaneously, Figure 7 From the displayed noise ...

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Abstract

The invention belongs to the technical field of communication, and particularly relates to a broadband band-pass filter system and method, and the system comprises: a sampling unit which is used for collecting an original signal; ta band-pass filtering unit which is used for extracting fundamental wave signals of the signals; a zero-phase filtering unit which is used for receiving the output signal of the first band-pass filtering unit and carrying out secondary filtering on the output signal; and a first control unit which is used for fitting the amplitude-frequency characteristic curve of the fundamental wave filtering unit to obtain the relationship between the amplitude gain and the frequency, and carrying out amplitude compensation. After an original signal is collected, the originalsignal is preprocessed, when band-pass filtering is carried out on the preprocessed signal, a fundamental wave signal of the preprocessed signal is more easily extracted, and then signal amplitude compensation is carried out on the extracted fundamental wave signal, so that the accuracy of the finally band-pass signal is higher, and meanwhile, the band-pass filtering efficiency is higher.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a broadband bandpass filter system and method. Background technique [0002] A band-pass filter refers to a filter that can pass frequency components in a certain frequency range, but attenuates frequency components in other ranges to a very low level, as opposed to the concept of a band-stop filter. An example of an analog bandpass filter is a resistor-inductor-capacitor circuit (RLC circuit). These filters can also be produced by combining low-pass filters with high-pass filters. An ideal bandpass filter should have a completely flat passband, with no amplification or attenuation in the passband, and all frequencies outside the passband are completely attenuated. In addition, the conversion outside the passband is extremely small The frequency range is complete. [0003] In practice, an ideal bandpass filter does not exist. Filters are not capable of compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D3/00H03H7/12H03H17/02H04L27/148
CPCH03D3/005H03H7/12H03H17/0219H03H17/0294H03H2218/12H04L27/148
Inventor 潘文桥
Owner HANGZHOU LEGEND INTELLIGENT EQUIP CO LTD
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