CN2708444Y - Networked video audio system applicable to bus, railroad car, and plane - Google Patents

Abstract

The utility model discloses a networked video audio system applicable to buses, railroad cars and planes and belongs to the field of the electronic image and audio system. The system provides a set of image and audio system for each chair which is not like the system existed and applied widely at present that only a few screens are arranged on every vehicle. The system adopts the technique of cable TV and LonWorks united together. Through TV channels and network changes the transportation and the adjustment of the channel and audio signal from a front chair to a back chair can be realized. The networked video audio system is composed of a DVD broadcast aggregate, a modulator aggregate, a frequency mixer, a transceiver, a Neuron chip, a FlashROM, a set of keys, an I<2>C part, a digital potentiometer, a stereophony audio power amplifier and a digital switch by function. The networking of a screen on every chair is realized. The utility model has the advantages of low cost, simple structure and broad application.

Description

A kind of audio-video system that can be used for the networking of big bus car, passenger train and aircraft

Technical field the utility model belongs to electronics audio-video system field.

Background technology is current, and the employed audio-video systems in field such as big bus car, passenger train and aircraft all are the single systems of single screen or several screens.And along with people are more and more higher to the requirement of quality of the life, this audio-video system more and more can not satisfy people's needs.The patent that the applicant once applied for, patent No. ZL 022839836, also only provided an example of the control system of multi-screen networked system, do not contain total system.So, the perfect solution that the current utmost point needs total system to constitute.

But summary of the invention the utility model proposes the implementation method of audio-video system of the maturation of a large-scale application, and this cover system has that cost is low, simple in structure, applied range, characteristics that the property implemented is good, can implement on a large scale.The technical scheme that its technical matters that solves the utility model adopts is: system adopts the LonWorks technology to be unified into Control Network; Web portal place at each node adds holding circuit; system adopts the control chip of Neuron chip as the control system (hereinafter to be referred as node) of the TFT LCDs (hereinafter to be referred as screen) on each seat; cooperate transceiver to constitute smart transceiver; realization is to the selection of the channel of program on the front-row seats and to the adjusting of the volume of the earphone on the back seat, because the earphone of front-row seats is to draw at the node of back seat.Adopt the external storage of the strong Flash ROM of antijamming capability as the Neuron chip.The transmission of signal is such, is radiofrequency signal with the multichannel Video and the stereophony Audio signal of many DVD player outputs through many modulators modulate, wherein stereophony Audio signal adopts FM FM multiplex modulator, the Video signal adopts video modulator, the modulating frequency of Video signal is avoided FM FM multiplex wave band, these radiofrequency signals that modulate are through the frequency mixer mixing, by single radio-frequency cable output, a terminal box is arranged below each seat, the inside has (to be imported a pair of to the power interface of the node power supply of each seat, export a pair of a pair of) with this node, many set of joints of two netting twines (are imported a pair of, export a pair of a pair of with this node) and the radio frequency divider, the I on the radiofrequency signal access node of divider output ²C device (a kind of tuner of exporting FM two-channel FM multiplex, Video and monophony Audio signal) needs two I in the practical application ²The C device, a demodulation that is used for vision signal, the demodulation that another is used for audio frequency FM f-m stereo acoustical signal offers display screen and stereo audio power amplifier respectively.I ²The Video signal that the C device demodulates must insert display screen again through the digital switch of a Neuron chip controls, realizes the switch of screen.Need to prove, if the channel selection button below screen, then volume control signal must transmit through network, if the channel selection button on earphone next door, then channel selecting signal must transmit through network.

Appended drawings is circuit theory diagrams, and this system is by: DVD player group, modulator group, frequency mixer, transceiver, Neuron chip, Flash ROM, one group of button, I ²Compositions such as C device, digital regulation resistance, stereo audio power amplifier, digital switch.

Embodiment as shown in drawings, can select to adopt five DVD player, need five video modulators, select channel VHF3,5,7,9,12, also need five FM FM multiplex audio demodulators, select channel 96MHz, 97MHZ, 98MHz, 99MHZ, 100MHz, respectively corresponding VHF3,5,7,9,12 channels, one No. ten frequency mixer, output termination radio frequency network.Power-supply system can be selected the genset of 220V 2KW on passenger train, connect D.C. regulated power supply output+15V voltage; On the big bus car, can select 500W or 1KW generator, connect D.C. regulated power supply output+15V voltage.Each node has a terminal box, and perhaps two nodes are with a terminal box.Is example with two nodes with a terminal box, and+15V attaching plug has one group of input, one group of output, two group of branches to export, and reticle plug provided have one group of input, one group of output, two group of branches to export, and also has one 2 divider.The plug of node has power input plug, reticle plug provided, headset plug on the chair headrest, if button also has one group of button plug on the earphone next door, button directly is welded on the circuit board at the then button on screen next door.In addition the smart transceiver that also has Neuron chip and transceiver to form on the node is handled network signal.The Neuron chip is also controlled I ²C device and digital regulation resistance are realized the adjusting of channel and volume, and its principle is that radiofrequency signal is passed through I ²The tuner demodulation just of C device wherein is used for the I of demodulated audio signal ²C device 2 output FM f-m stereo sound audio signals are given digital regulation resistance 1 and digital regulation resistance 2, export to earphone by the stereo audio power amplifier again, because digital regulation resistance 1 and digital regulation resistance 2 are controlled by the Neuron chip, thereby can adjust the sound size, and are used for the I of demodulated video signal ²C device 1 output Video signal is given digital switch, exports to display image screen again, because I ²The C device is tuner just, is controlled by the Neuron chip, so it can realize from the VHF wave band to the FM wave band and the selection of the full wave channel of UHF wave band.The Neuron chip also passes through I ²C bus (as shown in drawings) or digital switch of I/O pin control, the switch of realization screen, key groups directly is connected on several I/O pins of Neuron chip in addition, and the Neuron chip is Flash ROM of tyre also.

Claims (1)

1. A kind of audio-video system that can be used for the networking of big bus car, passenger train and aircraft, it comprises DVD player group, modulator group, frequency mixer, transceiver, Neuron chip, Flash ROM, one group of button, I ²C device, digital regulation resistance, stereo audio power amplifier, digital switch, it is characterized in that: the Video signal output part of DVD player connects video modulator, the two-channel Audio signal output part of DVD player connects FM FM multiplex modulator, the output terminal of video modulator is connected the input end of frequency mixer with the output terminal of FM FM multiplex modulator, the radio frequency main line network of the output terminal connected system of frequency mixer, the divider of terminal box connects I ²The rf inputs of C device, the Neuron chip connects transceiver and Flash ROM, and the Neuron chip connects I ²C device 1 and I ²C device 2, the Neuron chip connects digital regulation resistance 1 and digital regulation resistance 2, and the Neuron chip connects key groups and digital switch, I ²C device 1 linking number word switch, I ²C device 2 connects digital regulation resistance 1 and digital regulation resistance 2; digital switch connects the TFT LCDs; digital regulation resistance 1 is connected the stereo audio power amplifier with digital regulation resistance 2, and the stereo audio power amplifier connects earphone, and transceiver is connected by the LonWorks network of holding circuit and total system.

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