CN100421360C - Audio-visual system by railway or subway coach broadcasting or power-supply circuit transmission - Google Patents

Abstract

The invention can transmits several decade routes of compressed audio and video digital signals on power line, broadcast cable or other kind of cables while not effecting the operations of other devices on said lines or cables. Due to the interference produced by trains, the invention uses the frequency letting-by technology and the contention resolution technology to make OFDM ultra-wideband carrier wave technology have higher anti-interference capability. The invention can be realized on the power line or broadcast cable used by railway train and underground railway station.

Description

Utilize the audio-visual system of railway, subway coach broadcasting or power circuit transmission

Affiliated technical field:

The present invention relates to train video monitoring and audio/video player system, particularly a kind of the utilization has power circuit or program circuit realization audio-video monitoring and audio frequency and video playing system now on railroad train, the subway train

Background technology:

In railroad train, subway train video monitoring and video playback technical field, existing multinomial national patent, but use wired or wireless technology all can not really solve video monitoring and this difficult problem of video playback of train in the existing multinomial national patent comprehensively, because railway car has uniqueness, cause traditional vision cable, broadband netting twine, microwave or WLAN (wireless local area network) solution etc. all not to have feasibility, main cause is:

1, railway car does not allow the too many cable of cloth;

2, because railway car is kept in motion, and need grouping, so the reliability of cable connector is very crucial between compartment and the compartment, because the audio frequency and video transmission cable has the impedance requirement or uses multi-core cable, makes that the cable connector is difficult to make;

3, train is advanced needs often to turn, and it is infeasible therefore adopting the scheme of microwave;

4, railway car has very strong shielding action for wireless signal, makes that the enforcement of microwave or WLAN (wireless local area network) solution is very difficult.

5, train disturbs very strong in traveling process, especially in low frequency part and hyperfrequency part, mainly be the interference signal owing to generations such as static that electric power produced and corresponding, the frequency interferences for tradition monitoring and its place of digital supervision is very serious like this;

6, because railway car has marshalling, therefore on the angle of arranging, the position of control point often changes, and also needs corresponding variation like this on the intensity of signal;

7, the pilot signal of train can not become mobile interference source; Therefore all signal emission part all must be considered its power problem;

8, railway car in use will often be organized into groups again, again has the compartment of not laying vision cable, broadband netting twine or WLAN (wireless local area network) in the railway car after the marshalling, even laid vision cable, broadband netting twine, microwave or WLAN (wireless local area network), when some connection devices or a certain some cable break down, the operation of train video monitoring and audio/video player system is with unreliable or interrupt.

Summary of the invention:

The purpose of this invention is to provide a kind of utilize existing power circuit or program circuit realization audio-video monitoring and audio frequency and video playing system on railroad train, the subway train.This system schema has solved existing railroad train, subway train vehicle monitoring system comprehensively, utilize vision cable, broadband netting twine or wireless local network transmission image on installation is provided with inconvenience, poor reliability, exist problems such as limitation.

The present invention is achieved through the following technical solutions, use OFDM (OFDM) ultra broadband ZAP, this technology can be transmitted the audio frequency and video digital signal of tens of roads compression on power line, broadcast wire or other cable, do not influence in transmission course that miscellaneous equipment normally moves on the circuit.Railroad train, subway train can produce a large amount of Electromagnetic Interference in advancing, influence the audio frequency and video transmission, at this problem, former technology is improved aspect anti-interference, the employing frequency is dodged, channel contention ruling technology, make OFDM (OFDM) ultra broadband ZAP have higher antijamming capability, guaranteed the reliability of audio-visual system transmission.

4, description of drawings:

Fig. 1: utilize existing power circuit or program circuit realization audio-video monitoring and audio frequency and video playing system schematic diagram on railroad train, the subway train;

Fig. 2: equipment schematic diagram in railroad train, the subway train compartment;

Fig. 3: equipment schematic diagram in railroad train, the subway train commander compartment

1. carrier network cameras among the figure, 2. wireless receiving display, 3. carrier network transceiver, 4. Surveillance center, 5. supply line or program circuit in the compartment

Embodiment:

Carrier network camera 1 is arranged on every joint interior, manycarrier network cameras 1 are installed in every joint compartment, aftercarrier network camera 1 compresses carrier processing with audio-video signal, existing power circuit or program circuit 5 are sent to theSurveillance center 4 of installing in the commander compartment in railroad train, subway train compartment, the audio-video signal of eachcarrier network camera 1 are stored, are decompressed and monitoring in real time by Surveillancecenter 4.

Carrier network transceiver 3 andwireless receiving display 2 are arranged on every joint interior, acarrier network transceiver 3 and a plurality ofwireless receiving display 2 are installed in every joint compartment, the multichannel audio-video frequency signal that theSurveillance center 4 of installing in the commander compartment will send, after the compression carrier processing, existing supply line or program circuit 5 in railway car,carrier network transceiver 3 in all compartments of train sends, aftercarrier network transceiver 3 decompresses the multi-channel video signal that receives, send on a plurality ofwireless receiving displays 2 in this compartment with wireless mode.

Between eachwireless receiving display 2 and each thecarrier network transceiver 3, audio/video signal transmission uses wireless mode to connect.Eachcarrier network camera 1,carrier network transceiver 3 are connected supply line or the program circuit 5 that only uses in railroad train, the subway train compartment with the transmission ofSurveillance center 4, not be used between the compartment with in the compartment to connect up in addition.

Carrier network transceiver 4 has:

(1). the function of railroad train, subway train compartment power circuit or program circuit carrier transmitting-receiving wideband data

(2). the automatic network-building function

(3). multiway images compression, decompressing function

(4). the multiple wireless transmission-receiving function

(5). the vision signal memory function.

The carrier network camera has:

(1). the function of railroad train, subway train compartment power circuit or program circuit carrier transmitting-receiving wideband data

(2). the automatic network-building function

(3). camera function

(4). sound-recording function

(5). night vision function

The wireless receiving display has:

(1). the audio-video wireless receiving function

(2). the audio frequency and video playing function

(3). the big I according to the wireless receiving indicator screen fixedly mounts or hands.

Surveillance center has:

(1). use the function of railroad train, subway train compartment supply line or program circuit carrier transmitting-receiving wideband data

(2). the automatic network-building function

(3). the video server function

(4). multiway images compression, decompressing function

(5). the multichannel audio-video frequency playing function

(6). multichannel audio-video frequency signal storage function

(7). audio, video data editor output function.

(8). many menu display functions

Claims (4)

1. one kind is utilized railway, the audio-visual system of subway coach broadcasting or power circuit transmission, it is characterized in that, described system comprises the wireless receiving display, the carrier network camera, carrier network transceiver and Surveillance center, adopt wireless mode to link to each other between described carrier network transceiver and the wireless receiving display, described carrier network camera, pass through railroad train between carrier network transceiver and the Surveillance center, subway coach broadcasting or power circuit link to each other, and utilize frequency in OFDM ultra-wideband ZAP and this technology to dodge with channel contention ruling technology and realize the carrier network camera, audio-video signal transmission between carrier network transceiver and the Surveillance center;

After wherein said carrier network camera compresses carrier processing with audio-video signal, be sent to described Surveillance center through described broadcasting or power circuit, the audio-video signal of each carrier network camera stored, decompressed and monitoring in real time by Surveillance center;

The multichannel audio-video frequency signal that described Surveillance center will send, after the compression carrier processing, send signal through described broadcasting or power circuit to described carrier network transceiver, described carrier network transceiver with the multichannel audio-video frequency signal decompression that receives after, send on the described wireless receiving display with wireless mode.

2. the audio-visual system that utilizes railway, subway coach broadcasting or power circuit transmission according to claim 1 is characterized in that the carrier network camera is arranged on every joint interior, and many carrier network cameras are installed in every joint compartment.

3. the audio-visual system that utilizes railway, subway coach broadcasting or power circuit transmission according to claim 1, it is characterized in that carrier network transceiver and wireless receiving display are arranged on every joint interior, a carrier network transceiver and a plurality of wireless receiving display are installed in every joint compartment.

4. the audio-visual system that utilizes railway, subway coach broadcasting or power circuit transmission according to claim 1, it is characterized in that this system is applied to passenger train, railway freight-car, subway train or city railroad class train, play so that audio-video monitoring and audio frequency and video to be provided.

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