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Method for transmitting multimedia signals in tramcar

A transmission method and tram technology, applied in the field of communication, can solve problems affecting video playback, unfavorable long wiring of AV signal lines, out-of-synchronization of screen and screen playback, etc., to achieve the effect of ensuring playback quality and overcoming wiring difficulties

Active Publication Date: 2015-01-07
ANNAX SUZHOU RAIL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly accepting AV signals and playing and displaying them, there are the following problems: 1) Due to the attenuation of AV signals, too long AV signal lines can easily affect the effect of video playback; 2) AV signal lines are not conducive to long Wiring; 3) The order in which audio and video are received leads to asynchronous playback between screens
Therefore, the transmission distance has a great influence on the clarity of the AV signal, and the signal lines on the tram are too long to interfere with each other, seriously affecting the playback quality of audio and video

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0014] Embodiment, Suzhou Tramway Line 1.

[0015] First, the AV signal receiver receives the AV signal generated by the ground control center, and uses the AV line to transmit between the AV signal receiver and the interface of the control board. The AV signal is converted into digital signal through the control board. For network transmission, when the digital signal is transmitted over the network, the corresponding audio compression and video compression are performed on the audio and video digital signal first, and the audio and video synchronization algorithm is used for the compressed audio and video data.

[0016] The audio-video synchronization algorithm is an audio-video synchronization algorithm carried out according to a timestamp, and the timestamp refers to the time value of the audio-video frame relative to the system when playing, and the content of the audio-video synchronization algorithm is, at the sending end, First, the audio and video frames are divided i...

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PUM

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Abstract

The invention relates to the technical field of communication, in particular to a method for transmitting multimedia signals in a tramcar. The method includes the steps that firstly, AV signals generated by a ground control center are received by an AV signal receiver, an AV circuit is adopted between the AV signal receiver and a control panel interface for transmission, analog-digital conversion is conducted on the AV signals through a control panel, the AV signals are converted into digital signals which are transmitted through a network, when the digital signals are transmitted through the network, firstly, corresponding audio compression and video compression are conducted on the AV digital signals, and an AV synchronization algorithm is adopted in compressed AV data. The method solves the problems that AV signal remote transmission lines are difficult to arrange and signals interfere with one another, and the method guarantees the AV playing quality.

Description

[0001] technical field [0002] The invention relates to the technical field of communication, in particular to a method for transmitting multimedia signals in a tram. Background technique [0003] The AV signal is generated by the ground control center and is mainly used to send video and audio data on the ground. The existing method in the tram is to receive the media data through AV and display it on the LCD on the train. Directly accepting AV signals and playing and displaying them, there are the following problems: 1) Due to the attenuation of AV signals, too long AV signal lines can easily affect the effect of video playback; 2) AV signal lines are not conducive to long Wiring; 3) The order in which audio and video are received leads to asynchronous playback between screens. Therefore, the transmission distance has a great influence on the clarity of the AV signal, and the signal lines on the tram are too long to interfere with each other, seriously affecting the pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/8547H04N21/643H04N21/647H04N21/845
CPCH04N21/6437H04N21/64776H04N21/8456H04N21/8547
Inventor 张明祥魏巍朱霖
Owner ANNAX SUZHOU RAIL SYST
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