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Automatic calibration composite video signal cable transmission equipment

A composite video signal and cable transmission technology, which is applied in the direction of cable transmission adaptation, can solve problems such as difficult adjustment of engineering requirements, and achieve the effect of convenient use and enhanced transmission distance

Inactive Publication Date: 2010-12-22
SHENZHEN UTEPO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the installer usually needs to adjust repeatedly to meet the engineering requirements, and it is usually not easy to adjust to meet the engineering requirements

Method used

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  • Automatic calibration composite video signal cable transmission equipment
  • Automatic calibration composite video signal cable transmission equipment
  • Automatic calibration composite video signal cable transmission equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] is a specific example of transmission over twisted pair cables.

[0030] The transmitting device pre-gains the transmitted signal by analyzing the characteristics of the line. The receiving device automatically analyzes the type of video signal, and at the same time analyzes the attenuation of the signal, and the signal size reference of the standard signal, and obtains the best video signal quality by equalizing the signal.

[0031] attached image 3 Shown is the system control block diagram of the signal transmitting part of the system equipment, which includes: a signal input (301) port, a DC low frequency signal gain control (302), a high frequency part signal gain control (303), and this part passes the signal micro The analysis of the online signal by the processor will automatically control the gain control of the low frequency signal and the high frequency signal. Unbalanced to balanced circuit (304), output signal sampling circuit (305), signal drive circuit ...

Embodiment 2

[0040] An embodiment of automatic equalization for long-distance transmission using coaxial cables. This example not only has long-distance signal automatic calibration function. It also has the functions of lightning protection, anti-jamming, and multi-channel output. The block diagram of the system structure diagram is attached Figure 9 shown. Including: signal input port (901), lightning protection circuit (902), anti-interference circuit (903), composite video signal equalization circuit (904), composite video distribution drive circuit (905), output port (906), synchronization signal separation A circuit (907), a low-frequency signal processing circuit (908), a high-frequency signal processing circuit (909), and a signal processing circuit (910).

[0041] When the system is not compatible with multiple composite video systems but only compatible with a single video signal, the synchronous signal separation circuit (907) can be canceled.

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PUM

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Abstract

The auto-calibration composite video signal cable transmission device of the present invention relates to the transmission device of network video signals. The auto-calibration composite video signal cable transmission device is composed of a transmitter and a receiver, wherein, the transmitter is composed of a signal input port, a synchronous signal separator circuit, a pre-equalizer, an unbalance-to-balance conversion circuit, a signal microprocessor, a low-frequency signal processing circuit, a signal driving circuit, a high-frequency signal processing circuit and a signal output port, andthe receiver is composed of a signal input port, a front-end signal processing circuit, a differential signal receiver, a video forward switching circuit, a synchronous signal separator circuit, a composite video signal equalization circuit, a low-frequency signal processing circuit, a high-frequency signal processing circuit, a composite video driving circuit and an output port. The present invention is particularly suitable for the long-distance transmission of VGA, a user does not need the complex regulation any more and can achieve an excellent video effect and really realize plug-and-play.

Description

Technical field: [0001] The present invention relates to electronic equipment for long-distance cable transmission of composite video signals. Background technique: [0002] Due to the non-linear attenuation characteristics of the composite video signal caused by long-distance cables, the video signal is unclear or distorted. In order to achieve the best image quality, a transmission device must be added. The current long-distance cable composite video transmission equipment judges the image quality after video transmission by naked eyes, and then adjusts the video gain parameters by manually adjusting the video adjustment components (such as: dial code, button or knob) to achieve the best video quality. In this case, the installer usually needs to make repeated adjustments to meet the engineering requirements, and it is usually not easy to adjust to meet the engineering requirements. According to the characteristics of signal transmission, the present invention automatic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/10
Inventor 聂怀军聂怀东聶怀春
Owner SHENZHEN UTEPO TECH CO LTD
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