Wireless self-powered eavesdropping device

Abstract

The invention discloses a wireless self-powered eavesdropping device. The device comprises a pickup, a wireless power transmission unit, an audio amplifier, a mixer, a carrier generation circuit and amicro transmitting antenna, wherein the pickup, the audio amplifier, the mixer and the micro transmitting antenna are connected in sequence; a first output port of the wireless power transmission unit is connected with the pickup, a second output port of the wireless power transmission unit is connected with the audio amplifier, and a third output port of the wireless power transmission unit is connected with the carrier generation circuit; an output end of the carrier generation circuit is connected with the mixer; the wireless power transmission unit is used for system power supply; the pickup is used for collecting an audio signal and completing the acoustic to electrical conversion of the audio signal; the audio amplifier is used for amplifying the amplitude of the voice signal; the carrier generation circuit is used for generating a high frequency carrier signal; the mixer is used for the frequency modulation of the audio signal and the high frequency carrier; and the micro transmitting antenna is used for transmitting a frequency modulated signal. The wireless self-powered eavesdropping device disclosed by the invention works at an adjacent idle frequency band of the frequency band where frequency modulation radio is located, and is subject to low frequency interference, thereby improving the listening effect.

Description

technical field [0001] The invention relates to the technical field of wireless microwave interception, in particular to a wireless self-powered interception device. Background technique [0002] In modern society, the important role of intelligence acquisition in national defense security, national interests, and social stability is becoming more and more obvious. Language is the most effective, credible, and direct way of information transmission, so listening to the content of the subject's conversation has become an important means of information acquisition. [0003] There are various means of eavesdropping, common ones include wired eavesdropping, laser / infrared eavesdropping, and radio eavesdropping. Among them, the wired eavesdropping system needs to connect the sound pickup part with the listening part, which limits the scope of work and increases the difficulty of deployment; laser / infrared eavesdropping has strict requirements on the positional relationship betwe...

AI Technical Summary

Problems solved by technology

However, the reflector-type microwave interception is easily affected by the phase noise of the frequency source, and the demodulation zero point problem exists, which makes the design of the interception terminal more difficult.

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