CN103731694B - A kind of Vehicular satellite television broadcasting system and method based on MOST networks - Google Patents

Abstract

The invention relates to the field of televisions, and discloses a vehicle-mounted satellite television broadcasting system based on a MOST network, which includes a vehicle-mounted satellite antenna, a vehicle-mounted television set, and further includes: a satellite receiver set-top box, an audio-video ADC converter, an MPEG board, and an intelligent network interface control device, wherein each of the satellite receiver set-top boxes is used to receive and demodulate each TV program signal, and the audio-video ADC converter is used to convert the audio-video analog signal of the TV program received by each of the satellite receiver set-top boxes into digital signal, the MPEG board is used to compress the digital signal converted by the audio-video ADC converter in real time, and transmit it to the intelligent network interface controller, and the intelligent network interface controller is connected to the MOST network, and each institute The vehicle-mounted TV is connected to the MOST network. This technology has the advantages of simple data processing and wiring, high transmission efficiency, small delay, stable system, and high transmission bandwidth.

Description

A vehicle-mounted satellite TV broadcasting system and method based on MOST network

technical field

The invention relates to the field of televisions, in particular to a vehicle-mounted satellite television broadcasting system and method based on a MOST network.

Background technique

Early cars didn't have any entertainment systems. With the development of electronic technology and the improvement of living standards, car audio has gone through several processes:

In 1924, Chevrolet built the first car equipped with a radio, ushering in a new era of car audio.

In the 1970s, car audio entered the era of cassette players.

In the 1980s, car audio entered the era of CD players.

In the 1990s, car audio entered the DVD era.

After 2000, car audio entered the era of navigation.

Since 2007, one-button navigation and the development of the Internet of Vehicles have brought car navigation into a golden age of rapid development. Various factories and brands of car navigation have sprung up like mushrooms after rain, blooming everywhere. The in-vehicle navigation products for small cars have experienced a blowout phenomenon.

However, compared with the prosperity of small cars, the car audio for collectively transported buses has been in a tepid state. At present, there are generally several types of bus car audio:

1. DVD player + LCD display mode: only DVD video playback function is provided. Only a single video source can be provided.

2. Hard disk player + liquid crystal display mode: it is an upgraded version of the above scheme, which can provide larger capacity and store more programs. But it can only provide a single video source.

3. Satellite TV receiver + RF (Radio Frequency, radio frequency) repeater + 7-inch TV. Compared with the previous two methods, there is a major breakthrough in that this solution can provide each passenger with an independent space to watch programs, that is, each passenger can choose the programs they like to watch through the TV tuner. It is not necessary to share a TV set with others. Compared with the car audio system used in cars, there are more passengers on the bus, and this solution can provide certain personalized services.

Disadvantages: The audio and video signals demodulated by the set-top box need to be modulated into analog RF signals through a multiplexer, and the hardware is complicated. Each TV needs to be connected with an antenna and an additional tuning module, and the wiring is complicated and the cost is high.

Contents of the invention

In view of the above problems, the first purpose of the embodiments of the present invention is to provide a vehicle-mounted satellite TV broadcasting system based on a MOST (MediaOriented System Transport, media-oriented system transmission) network. By adopting this solution, it can be achieved through simple hardware architecture and wiring. To realize the streaming transmission of TV program data, the data processing is relatively simple, and the transmission efficiency is high, the delay is small, the system is stable, and the transmission bandwidth is high.

The second purpose of the embodiment of the present invention is to provide a method for vehicle-mounted satellite TV broadcasting based on the MOST network. By adopting this solution, the stream transmission of TV program data can be realized through simple steps, and the data processing is relatively simple, and the transmission High efficiency, low delay, stable system and high transmission bandwidth.

A kind of vehicular satellite TV broadcasting system based on MOST network that the embodiment of the present invention provides, comprises vehicular satellite antenna, vehicular TV set, also includes: satellite receiver set-top box, audio-video ADC (Analog to Digital Converter, analog/digital converter) module , MPEG board, the first intelligent network interface controller, wherein,

Each of the satellite receiver top boxes is respectively used to receive and demodulate each TV program signal,

The audio-video ADC module is respectively connected with each of the satellite receiver set-top boxes, and is used to convert the audio-video analog signals of the TV programs received by each of the satellite receiver set-top boxes into digital signals,

The MPEG board is connected to the audio-video ADC module for real-time compression of the digital signal converted by the audio-video ADC module and transmitted to the intelligent network interface controller,

The first intelligent network interface controller is connected to the MOST network, and is used to control the driving of the MOST network, and to uniformly operate and manage each of the vehicle-mounted televisions connected to the MOST network,

Each of the vehicle-mounted televisions is connected to the MOST network, and is used to select and play each of the TV programs streamed in the MOST network;

The vehicle-mounted TV includes: a second intelligent network interface controller, a CPU processor, a display screen, a DA (Digital to Analog, digital-to-analog conversion) conversion chip, a loudspeaker and/or an earphone, wherein,

The second intelligent network interface controller is respectively connected with the CPU processor and the DA conversion chip, and is used for streaming the corresponding TV in the MOST network according to the input selected TV program information. The program signal is switched into the vehicle-mounted TV set,

The second intelligent network interface controller transmits the video signal of the TV program signal switched into the vehicle-mounted TV to the CPU processor, and the CPU processor decodes the video signal, and the decoded The video signal is transmitted to the display screen,

At the same time, the second intelligent network interface controller transmits the audio signal of the TV program signal switched into the vehicle-mounted TV to the DA conversion chip, and the DA conversion chip converts the audio signal into an analog audio Signals are output to the speakers and/or headphones.

Optionally, also includes a low-noise down-conversion amplifier, a power divider, wherein,

The low-noise down-frequency amplifier is connected to the vehicle-mounted satellite antenna, and is used to amplify and reduce the frequency of the TV program signal received by the vehicle-mounted satellite antenna,

The power divider is respectively connected with the low-noise down-frequency amplifier and the satellite receiver top box, and is used to divide the TV program signal amplified and down-frequency by the low-noise down-frequency amplifier into at least two signal outputs, and each signal output to one of said satellite receiver top boxes connected to said power splitter.

Optionally, the number of the satellite receiver top boxes is determined according to the number of TV programs to be played, and the TV program signals that each of the satellite receiver top boxes need to receive are preset.

Optionally, it also includes a network port or an optical connector, the intelligent network interface controller communicates with the network port or optical connector through a differential line, and the network port or optical connector is connected to the MOST network.

Optionally, the audio-video ADC module is divided into two parts:

An audio ADC module for converting an analog audio signal into a digital audio signal;

The video ADC module is used to convert the analog video signal into a digital video signal.

Optionally, the selected TV program information and operation information are input by touching the display screen.

A kind of vehicle-mounted satellite television broadcasting method based on MOST network that the embodiment of the present invention provides, described method comprises:

Each of the satellite receiver top boxes respectively receives and demodulates each TV program signal,

Convert the audio and video analog signals of TV programs received by each satellite receiver set-top box into digital signals, and compress the digital signals, and transmit them to the MOST network,

making the compressed TV program signals streamed in the MOST network, selecting and playing the TV programs streamed in the MOST network,

Connect with the MOST network through the first intelligent network interface controller, control the driving of the MOST network, and uniformly operate and manage each vehicle-mounted TV set connected to the MOST network;

The vehicle-mounted TV includes: a second intelligent network interface controller, a CPU processor, a display screen, a DA conversion chip, a loudspeaker and/or an earphone, wherein,

The second intelligent network interface controller is respectively connected with the CPU processor and the DA conversion chip, and is used for streaming the corresponding TV in the MOST network according to the input selected TV program information. The program signal is switched into the vehicle-mounted TV set,

The second intelligent network interface controller transmits the video signal of the TV program signal switched into the vehicle-mounted TV to the CPU processor, and the CPU processor decodes the video signal, and the decoded The video signal is transmitted to the display screen,

At the same time, the second intelligent network interface controller transmits the audio signal of the TV program signal switched into the vehicle-mounted TV to the DA conversion chip, and the DA conversion chip converts the audio signal into an analog audio Signals are output to the speakers and/or headphones.

Optionally, before each satellite receiver top box respectively receives and demodulates each TV program signal, it also includes:

Amplify and down-frequency the received TV program signal,

The amplified and frequency-reduced TV program signal is divided into at least two channels of signal output, and each channel of signal is output to a satellite receiver top box.

Optionally, the number of the satellite receiver top boxes is determined according to the number of TV programs to be played, and the TV program signals that each of the satellite receiver top boxes need to receive are preset.

It can be seen from the above that by applying the technical solution of this embodiment, the MOST network can realize streaming transmission of TV program data by performing real-time analog-to-digital conversion and compressed transmission on the TV program signal, and the data processing is relatively simple. And the MOST network uses twisted pair, coaxial cable or plastic optical fiber as the information transmission medium to realize the transmission of synchronous or asynchronous digital signals. It has the characteristics of efficient and timely streaming signal transmission, and the system is stable and the transmission bandwidth is high.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a kind of vehicle-mounted satellite TV broadcasting system schematic diagram based on MOST network provided by the present invention;

Fig. 2 is a schematic diagram of another vehicle-mounted satellite TV broadcasting system based on the MOST network provided by the present invention;

Fig. 3 is a structural schematic diagram of a vehicle-mounted television set provided by the present invention;

Fig. 4 is the schematic diagram of the third vehicle-mounted satellite TV broadcasting system based on the MOST network provided by the present invention;

Fig. 5 is a kind of flow chart of the vehicle-mounted satellite television broadcasting method based on MOST network provided by the present invention;

FIG. 6 is a flow chart of another method for vehicle-mounted satellite TV broadcasting based on the MOST network provided by the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1:

This embodiment provides a vehicle-mounted satellite TV broadcasting system based on the MOST network, as shown in Figure 1, comprising: a satellite receiver set-top box 02, an audio-video ADC module 03, an MPEG board 04, an intelligent network interface controller 05, and a vehicle-mounted television set 06 ,in,

Each of the satellite receiver top boxes 02 is used to receive and demodulate each TV program signal. The vehicle-mounted satellite antenna is used to receive TV program signals from satellites. The vehicle-mounted satellite antenna has the function of locking the designated satellite during movement, and can transmit multimedia information such as voice, data, dynamic images, faxes, etc. . Generally receive Ku-band satellite signals, the working frequency is 10.7-12.7GHz.

Can but not be limited to, the number of the satellite receiver top box 02 is determined according to the number of TV programs that need to be played, and the TV program signal that each of the satellite receiver top boxes needs to receive is preset. If it is an encrypted TV program, it needs authorized.

The audio-video ADC module 03 is respectively connected with each of the satellite receiver top boxes 02, and is used to convert the audio-video analog signals of the TV programs received by each of the satellite receiver top boxes 02 into digital signals, which can be, but not limited to, the The audio and video ADC module is divided into two parts: the audio ADC module is used to convert analog audio signals into digital audio signals, such as converting analog audio signals into digital I2S signals; the video ADC module is used to convert analog video signals into digital video signals , such as converting an analog video signal, such as a CVBS signal (Composite Video Broadcast Signal, composite video broadcast signal), into a digital RGB signal or a digital Ycbcr signal.

The MPEG board 04 is connected with the audio-video ADC module 03, and is used to compress the digital signal converted by the audio-video ADC module 03 in real time, and transmit it to the intelligent network interface controller 05, which can be, but not limited to, the The MPEG board is composed of two functions, one is to transmit the audio digital I2S signal to the intelligent network interface controller 05 through the MLB bus; the other is to compress the digital video signal into MPEG2/4 or H.264 signal in real time, and then pass The MLB bus transmits to the intelligent network interface controller 05.

The intelligent network interface controller 05 is connected to the MOST network, and is used to control the driving of the MOST network, and to uniformly operate and manage each of the vehicle-mounted televisions 06 connected to the MOST network. The intelligent network interface controller 05 can be selected according to the MOST network used, for example, the intelligent network interface controller 05 can be selected according to whether the network used is the MOST25, MOST50 or MOST150 network, for example, the MOST150 adopts OS81110. The number of TV programs that the vehicle-mounted TV 06 can receive depends on the bandwidth of the MOST network. The MOST network may be a ring topology or a star topology.

Can but is not limited to, as shown in Figure 2, the vehicle-mounted satellite TV broadcasting system based on the MOST network also includes a network port or an optical connector 09, and the intelligent network interface controller 05 is connected to the network port or the optical connector 09 through a differential line 09 for communication, and the network port or optical connector 09 is connected to the MOST network.

The MOST network often adopts a ring topology, and each of the vehicle-mounted TVs 06 is serially connected to the MOST network, and is used to select and play each of the TV programs streamed in the MOST network. The streaming transmission mainly refers to the general term for the technology of transmitting media (such as video and audio) through the network. Streaming transmission is the key technology for the realization of streaming media. Streaming media does not download the entire file before playing, but only stores the first part of the content in memory, and the data stream of streaming media can be transmitted and played at any time.

It can be but not limited to, as shown in FIG. 3 , the vehicle-mounted TV 06 includes: an intelligent network interface controller 061, a CPU processor 062, a DA conversion chip 063, a display screen 064, a loudspeaker and/or an earphone 065, wherein,

The intelligent network interface controller 061 is respectively connected with the CPU processor 062 and the DA conversion chip 063, and is used to transmit the corresponding TV programs streamed in the MOST network according to the input selected TV program information. The TV program signal is switched into the vehicle-mounted TV set 06,

The intelligent network interface controller 061 transmits the video signal of the TV program signal switched into the vehicle-mounted television 06 to the CPU processor 062, and the CPU processor 062 decodes the video signal, and the The decoded video signal is transmitted to the display screen 064,

At the same time, the intelligent network interface controller 061 transmits the audio signal of the TV program signal switched into the vehicle-mounted television 06 to the DA conversion chip 063, and the DA conversion chip 063 converts the audio signal into Analog audio signals are output to the speaker and/or earphones 065.

It is possible but not limited to input the selected TV program information and operation information by touching the display screen 064 .

It can be seen from the above that this technical solution can provide each passenger with an independent space to watch programs, that is, each passenger can choose the programs he likes to watch, without having to share a TV set with others. Moreover, the MOST network can realize streaming transmission of TV program data, and the data processing is relatively simple. And the MOST network uses twisted pair wires, coaxial cables or plastic optical fibers as the information transmission medium, usually in a ring topology, where up to 64 nodes can be connected in series through cables, the wiring is simple, and it has the characteristics of efficient and timely streaming signal transmission. Moreover, the system is stable and the transmission bandwidth is high.

Example 2:

This embodiment provides a vehicle-mounted satellite TV broadcasting system based on the MOST network. As shown in FIG. in,

The low-noise down-frequency amplifier 07 is connected with the vehicle-mounted satellite antenna 01, and its function is to amplify and reduce the frequency of the TV program signal received by the vehicle-mounted satellite antenna 01, such as changing Ku or C-band signals into L-band . The working process of the low-noise down-frequency amplifier 07 is to first amplify the high-frequency signal of the TV program received by the vehicle-mounted satellite antenna 01, and then use the local oscillator circuit to convert the high-frequency signal to an intermediate frequency and amplify it again, so as to benefit the same time. The axial cable transmits the TV program signal and the satellite receiver set-top box demodulates the TV program signal, and the intermediate frequency range is determined by the type of the low-noise down-frequency amplifier 07 .

The power divider 08 is respectively connected with the low-noise down-frequency amplifier 07 and the satellite receiver top box 02, and is used to divide the TV program signal amplified and down-frequency by the low-noise down-frequency amplifier 07 into at least two signal outputs, Each signal is output to a satellite receiver top box 02 connected to the power splitter. The power divider 08 adds a signal amplification function on the basis of a common divider, that is, the output signal will not affect the output power due to the increase in the number of output channels.

It can be seen from the above that this technical solution is beneficial to the transmission of the TV program signal and the satellite receiver set-top box to demodulate the TV program signal due to the amplification and frequency reduction of the TV program signal, and can divide one signal input into multiple signals output without affecting the output power.

Example 3:

The present embodiment provides a method for broadcasting vehicle-mounted satellite TV based on the MOST network, as shown in FIG. 5 , the method includes:

001. Each set-top box of the satellite receiver respectively receives and demodulates each TV program signal.

002. Convert the analog audio and video signals of TV programs received by each satellite receiver set-top box into digital signals.

003. Compress the digital signal and transmit it to the MOST network, so that the compressed TV program signals are streamed in the MOST network.

004. Select to play each of the TV programs streamed in the MOST network.

It may be, but not limited to, that the number of the satellite receiver set-top boxes is determined according to the number of TV programs to be played, and the TV program signals that each satellite receiver set-top box needs to receive are preset.

It can be seen from the above that by applying the technical solution of this embodiment, since the MOST network can realize streaming transmission of TV program data, the data processing is relatively simple. And the MOST network uses twisted pair, coaxial cable or plastic optical fiber as the information transmission medium, usually a ring topology, which can connect up to 64 nodes in series through cables to realize synchronous or asynchronous digital signal transmission, with high efficiency The characteristics of timely streaming signal, and the system is stable and the transmission bandwidth is high.

Example 4:

The difference between this embodiment and Embodiment 3 is that, as shown in Figure 6, the method includes:

001. The vehicle-mounted satellite antenna receives TV program signals.

002. Amplify and down-frequency the received TV program signal.

003. Divide the amplified and down-converted TV program signal into at least two signals for output, and output each signal to a satellite receiver top box.

004. Each set-top box of the satellite receiver respectively receives and demodulates each TV program signal.

005. Convert the analog audio and video signals of TV programs received by each satellite receiver top box into digital signals.

006. Compress the digital signal and transmit it to the MOST network, so that the compressed TV program signals are streamed in the MOST network.

007. Select and play each of the TV programs streamed in the MOST network.

It can be seen from the above that because the TV program signal is amplified and down-frequency, it is beneficial to transmit the TV program signal and the satellite receiver set-top box demodulates the TV program signal, and can divide one signal input into multiple signal outputs without affect the output power.

The implementation methods described above do not constitute a limitation to the scope of protection of the technical solution. Any modifications, equivalent replacements and improvements made within the spirit and principles of the above implementation methods shall be included in the protection scope of the technical solution.

Claims (9)

1. a kind of Vehicular satellite television broadcasting system based on MOST networks, including vehicle-mounted satellite antenna, Autcmotive television, it is special Sign is, further includes：Set top box for satellite receiver, audio and video ADC module, mpeg board, the first intelligent network interface controller, its In,

Each set top box for satellite receiver is respectively used to receive and demodulates each TV programme signal,

The audio and video ADC module is connected with each set top box for satellite receiver respectively, for by each satellite receiver top The audio and video analog signal for the TV programme that box is received is converted to digital signal,

The mpeg board is connected with the audio and video ADC module, for the transformed number of audio and video ADC module described in Real Time Compression Word signal, and first intelligent network interface controller is transferred to,

First intelligent network interface controller and the MOST network connections, for controlling the driving of the MOST networks, And unified operation, each Autcmotive television of management and the MOST network connections,

Each Autcmotive television is connected in the MOST networks, is transmitted as a stream for selecting to play in the MOST networks Each TV programme；

The Autcmotive television includes：Second intelligent network interface controller, CPU processor, display screen, DA conversion chips, raise Sound device and/or earphone, wherein,

Second intelligent network interface controller is connected with the CPU processor and the DA conversion chips respectively, for root The corresponding TV programme signal that will be transmitted as a stream according to the selected TV program information of input in the MOST networks The Autcmotive television is switched into,

Second intelligent network interface controller will be switched into the video of the TV programme signal of the Autcmotive television Signal transmission gives the CPU processor, and the CPU processor decodes the vision signal, described is regarded decoded Frequency signal transmission gives the display screen,

Meanwhile second intelligent network interface controller will be switched into the TV programme signal of the Autcmotive television Audio signal transmission gives the DA conversion chips, and it is defeated that the audio signal is converted to simulated audio signal by the DA conversion chips Go out to the loudspeaker and/or earphone.

2. the Vehicular satellite television broadcasting system based on MOST networks as claimed in claim 1, it is characterised in that further include low Noise frequency reducing amplifier, power divider, wherein,

The low noise frequency reducing amplifier is connected with the vehicle-mounted satellite antenna, for receive the vehicle-mounted satellite antenna TV programme signal is amplified and frequency reducing,

The power divider is connected with the low noise frequency reducing amplifier and set top box for satellite receiver respectively, for will be described low Noise frequency reducing amplifier amplifies is divided at least two paths of signals output with the TV programme signal after frequency reducing, is given per signal output all the way One set top box for satellite receiver being connected with the power divider.

3. the Vehicular satellite television broadcasting system based on MOST networks as claimed in claim 1, it is characterised in that the satellite The TV programme quantity that the number of receiving set up box plays as needed determines, and presets each described satellite reception Set-top box needs the TV programme signal received.

4. the Vehicular satellite television broadcasting system based on MOST networks as claimed in claim 1, it is characterised in that further include net Mouth or light connector, the intelligent network interface controller are communicated by differential lines and the network interface or light connector, the net Mouth or light connector and the MOST network connections.

5. the Vehicular satellite television broadcasting system based on MOST networks as claimed in claim 1, it is characterised in that the sound regards Frequency ADC module divides two parts：

Audio ADC module, for simulated audio signal to be converted into digital audio and video signals；

Video ADC module, for analog video signal to be converted into digital video signal.

6. a kind of Vehicular satellite television broadcasting system based on MOST networks as claimed in claim 1, it is characterised in that pass through Touch TV program information and operation information selected by the display screen input.

A kind of 7. Vehicular satellite television broadcasting method based on MOST networks, it is characterised in that the described method includes：

Each set top box for satellite receiver receives and demodulates each TV programme signal respectively,

The audio and video analog signal for the TV programme that each set top box for satellite receiver is received is converted to digital signal, and to described Digital signal is compressed, and is transferred to the MOST networks,

So that compressed each TV programme signal is transmitted as a stream in the MOST networks, selection is played in the MOST Each TV programme transmitted as a stream in network,

By the first intelligent network interface controller and the MOST network connections, the driving of the MOST networks is controlled, and is united One operation, each Autcmotive television of management and the MOST network connections；

The Autcmotive television includes：Second intelligent network interface controller, CPU processor, display screen, DA conversion chips, raise Sound device and/or earphone, wherein,

Second intelligent network interface controller is connected with the CPU processor and the DA conversion chips respectively, for root The corresponding TV programme signal that will be transmitted as a stream according to the selected TV program information of input in the MOST networks The Autcmotive television is switched into,

Second intelligent network interface controller will be switched into the video of the TV programme signal of the Autcmotive television Signal transmission gives the CPU processor, and the CPU processor decodes the vision signal, described is regarded decoded Frequency signal transmission gives the display screen,

Meanwhile second intelligent network interface controller will be switched into the TV programme signal of the Autcmotive television Audio signal transmission gives the DA conversion chips, and it is defeated that the audio signal is converted to simulated audio signal by the DA conversion chips Go out to the loudspeaker and/or earphone.

8. the Vehicular satellite television broadcasting method based on MOST networks as claimed in claim 7, it is characterised in that described defended each Before star receiving set up box receives and demodulates each TV programme signal respectively, further include：

The TV programme signal received is amplified and frequency reducing,

It will amplify and be divided at least two paths of signals output with the TV programme signal after frequency reducing, one is given per signal output all the way Set top box for satellite receiver.

9. the Vehicular satellite television broadcasting method based on MOST networks as claimed in claim 7, it is characterised in that the satellite The TV programme quantity that the number of receiving set up box plays as needed determines, and presets each described satellite reception Set-top box needs the TV programme signal received.