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Audio video wireless receiving device

A wireless receiving device, audio and video technology, used in TV, color TV, closed-circuit TV system and other directions, can solve the problems of poor image quality, low reliability, difficult to receive signals, etc., achieve signal integrity without distortion, and improve anti-interference ability , the effect of high signal fidelity

Inactive Publication Date: 2009-04-15
邓明友
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the sensitivity of the receiving device is low, it is difficult to receive the signal from the transmitter, the received sound is not clear, the image quality is poor, and the reliability is low

Method used

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  • Audio video wireless receiving device
  • Audio video wireless receiving device
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Embodiment Construction

[0027] An audio and video wireless receiving device, comprising a high frequency signal input module, a reference signal input module, a frequency mixing module, a frequency selection amplification module, an intermediate frequency demodulation module, a video output module and an audio output module; the high frequency signal input module receives and Amplify the wireless transmission signal and output it to the first input terminal of the frequency mixing module; the reference signal input module generates the required reference signal, and outputs the reference signal to the second input terminal of the frequency mixing module; The signal and the reference signal are mixed to generate two signals of "sum frequency" and "difference frequency". The "difference frequency" signal is screened out by the frequency selection amplifier module. The intermediate frequency amplifying circuit in the intermediate frequency demodulation module is amplified, and then the intermediate frequ...

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PUM

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Abstract

This invention discloses an audio-video radio receiving device including a mixing module and an IF demodulation module, in which, the output of said mixing module is coupled with the input of the IF demodulation module, a frequency selection amplification module, the input and output of which are connected with the output of the mixing module and the input of the IF demodulation module. In this invention, a chip-microcomputer and the chip of a phase-locked ring control the output signals of a local oscillator to make the output signal frequency more stable and provide stable reference signals to the mixer suitable for the further process to successful circuits. Since applying an IF filter, selecting useful signals and filtering useless signals, the ability of anti-interference to other radio waves is increased.

Description

[technical field] [0001] The invention relates to the security field, in particular to an audio and video wireless receiving device. [Background technique] [0002] Audio and video wireless transceiver technology has been widely used in the field of security. The receiving party receives the specific frequency signal transmitted by the transmitting party. After decoding and other steps, it obtains sound and image information close to the original. Through the display and speakers, people can Know the security status of the monitored area. [0003] In the prior art, the sensitivity of the receiving device is low, it is difficult to receive the signal from the transmitter, the received sound is not clear, the image quality is poor, and the reliability is low. [Content of the invention] [0004] The technical problem to be solved by the present invention is to provide an audio and video wireless receiving device, which has high sensitivity, can improve signal receiving quali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04N7/18H04N21/43
Inventor 邓明友
Owner 邓明友
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