Audio and video wireless transmitting device

A wireless transmitting device, audio and video technology, applied in the direction of TV, color TV, color TV parts, etc., can solve the problems of large shape, complex structure, narrow bandwidth, etc., to achieve stable and clear images, high frequency stability, sound undistorted effect

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

[0002] In the prior art, there are many switching devices for video signals and radio frequency signals, but few transmitting devices, which can be basically divided into two types. One is a transmitting device similar to a TV station, which has a large shape and a complex structure. One is a transmitting device similar to mobile phones and paging. The transmitting device is a single-frequency point transmission with a narrow bandwidth.

Method used

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  • Audio and video wireless transmitting device
  • Audio and video wireless transmitting device
  • Audio and video wireless transmitting device

Examples

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Embodiment Construction

[0026] The present invention will be further elaborated below according to the drawings and specific embodiments.

[0027] An audio and video wireless transmitter includes an audio primary modulation circuit 1 , a video pre-emphasis circuit 2 , a voltage-controlled oscillation circuit 3 , an amplifying circuit 4 and a phase-locked loop circuit 5 .

[0028] Such as figure 1 As shown, the circuit at the audio input end includes a filter circuit 11 , an audio primary modulation circuit 1 and an isolation coupling circuit 13 in sequence. The filter circuit 11 is used to filter out the noise in the audio signal, and is a resistance-capacitance filter circuit composed of the fourth resistor R4 and the eighth capacitor C8: one end of the fourth resistor R4 is connected to the audio input terminal A and one end of the eighth capacitor C8 , the other end is connected to the input end of the primary audio modulation circuit 1; the other end of the eighth capacitor C8 is grounded.

[0...

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PUM

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Abstract

The invention relates to a wireless emission device with audio / video transmission function and emission frequency point controlled by phase-locking loop and SCM, which comprises an audio primary modulation circuit, a video preemphasis circuit, a voltage-controlled oscillatory circuit, a amplification circuit, and a phase-locking loop circuit with a phase-locking loop chip, a SCM, a switch signal circuit, a crystal oscillation and loop filter. This invention is simple and high reliable with 8MHZ bandwidth, and can be used to monitor in wide range.

Description

[technical field] [0001] The invention relates to a wireless transmitting device, in particular to a wireless transmitting device with audio and video transmission functions, which adopts a phase-locked loop and a single-chip microcomputer to control the transmitting frequency point. [Background technique] [0002] In the prior art, there are many switching devices for video signals and radio frequency signals, but few transmitting devices, which can be basically divided into two types. One is a transmitting device similar to a TV station, which has a large shape and a complex structure. One is a transmitting device similar to a mobile phone or a paging device. The transmitting device is a single-frequency point transmission with a narrow bandwidth. [Content of the invention] [0003] The purpose of the invention is to solve the wireless radio frequency transmission of video and audio signals, and adopt a phase-locked loop and a single-chip microcomputer to control the tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/38
Inventor 邓明友
Owner 邓明友
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