Internet-of-Things signal transmission noise reduction system

Abstract

The invention discloses an Internet-of-Things signal transmission noise reduction system. The circuit comprises a band-pass filter circuit, a phase detection compensation circuit, an amplitude stabilization circuit and a frequency selection output circuit. Band-pass filtering is carried out on the received analog signal; the amplitude stabilization circuit utilizes the characteristic that the sumof parallel dynamic resistances of a diode D2 and a diode D3 changes along with the current of a feedback loop to adjust the amplification factor of the amplitude stabilization circuit, signal amplitudes are stabilized, the phase detection compensation circuit adopts operational amplifiers AR2 and AR3 to detect signal phase differences before and after band-pass filtering and takes amplitudes of the signal phase differences; the conduction states of the silicon controlled rectifier Q1 and the triode Q2 are controlled; the frequency selection output circuit utilizes parallel resonance of the adjustable transformer T1 and the capacitor C11 to achieve signal frequency selection, noise reduction processing is carried out on analog signals of the Internet of Things, and meanwhile the problem ofsignal distortion caused by nonlinear phase shift of an analog filter is solved.

Description

technical field [0001] The invention relates to the technical field of the Internet of Things, in particular to an Internet of Things signal transmission noise reduction system. Background technique [0002] At present, when the Internet of Things transmits long-distance wireless analog quantities in the channel, it is often subject to high-frequency noise interference caused by construction site construction and operation, car startup, etc., as well as radio noise caused by illegally installed radio stations and high-power cordless phones. Interference, leading to the problem of receiving signal jitter and signal distortion, causing errors in the received information, which has a great impact on subsequent data analysis. Therefore, after receiving the signal with the receiver, it is necessary to perform noise reduction processing, and then the processed signal transmitted to the IoT control terminal. In terms of noise reduction, the commonly used analog filters on the mark...

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Problems solved by technology

[0002] At present, when the Internet of Things transmits long-distance wireless analog quantities in the channel, it is often subject to high-frequency noise interference caused by construction site construction and operation, car startup, etc., as well as radio noise caused by illegally installed radio stations and high-power cordless phones. Interference, leading to the problem of receiving signal jitter and signal distortion, causing errors i

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