CN102932689A - Local area network (LAN) based method for transmitting digital television signal and digital television receiving terminal - Google Patents
Local area network (LAN) based method for transmitting digital television signal and digital television receiving terminal Download PDFInfo
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Abstract
The invention discloses an LAN based method for transmitting a digital television signal and a digital television receiving terminal. The method comprises that transmission control protocol (TCP) linkage is established between a terminal device and the digital television receiving terminal through an LAN; the terminal device sends a digital television channel list acquisition instruction to the digital television receiving terminal; the digital television receiving terminal sends a digital television channel list to the terminal device in response to the digital television channel list acquisition instruction; the terminal device selects a channel to be played from the channel list and sends a corresponding channel number to the digital television receiving terminal; and a user datagram protocol (UDP) based data channel is established between the digital television receiving terminal and the terminal device through the LAN, and the digital television receiving terminal sends a digital television program stream corresponding to the channel number to the terminal device. By the aid of the method, users can enjoy high-quality digital television living broadcasting signals through the terminal device.
Description
Technical field
The present invention relates to digital television techniques, relate in particular to a kind of method and receiving terminal for digital television of transmitting digital television signal based on local area network (LAN).
Background technology
Along with the development of information and digital technology, TV tech has experienced after the development from the black-and-white TV to the color TV, enters the new stage from the simulated television to the Digital Television.Digital Television can provide more clearly picture, higher-quality impact effect and abundanter programme content than simulated television.Watch digital television program, must use set-top box.
The digital television system of main flow is abideed by the Moving Picture Experts Group-2 design, adopts standard TS(transport stream, Transport Stream) flow to transmit and look audio frequency, data-signal.The digital TV front-end platform encapsulates packing with TV signal, forms to carry out multiplexing, modulation after standard TS flows, and then arrives user configured digital TV set-top box by wired TV network transmission.Audio frequency, video, the data-signal that digital TV set-top box flows the TS that meets Moving Picture Experts Group-2 carries out channel tuner, descrambling, deciphering, demultiplexing and decoding to be processed, and after video, audio frequency, text-processing, outputs on the television set.
Yet, present digital television signal sends to television set for watching after can only receiving by digital TV set-top box, and other domestic terminal apparatus such as PAD, OTT set-top box, PC etc. can only be watched the digital TV direct program by internet (Internet).Although broadband network is popularized, network speed is improved constantly, and still there is the poor shortcoming of image quality in the digital program of network direct broadcasting, and free the delay.Domestic terminal apparatus is not owing to being connected with the TV network signal, and spectators can't watch the high-quality digital TV direct signal by the access of Cable line.And, at present in the existing technology, receiving terminal for digital television and other domestic terminal apparatus can only be watched same channel, can't support multichannel to share, if other home terminals are watched the programme content that is different from receiving terminal for digital television, need to use a plurality of receiving terminal for digital television, caused the increase of cost.
Therefore, exist in the prior art to a kind of can be based on family lan so that domestic terminal apparatus can be watched the needs of the technology of the digital television signal different from receiving terminal for digital television.
Summary of the invention
According to an aspect of the present invention, provide a kind of method of transmitting digital television signal based on local area network (LAN), comprised step:
Terminal equipment is set up TCP through described local area network (LAN) and receiving terminal for digital television and is linked;
Terminal equipment sends to described receiving terminal for digital television and obtains the digital TV channel list commands;
In response to the described digital TV channel list commands of obtaining, receiving terminal for digital television sends to terminal equipment with the digital TV channel tabulation;
Terminal equipment is chosen the channel of needs broadcast and corresponding channel is sent to described receiving terminal for digital television from channel list;
Receiving terminal for digital television is set up data channel based on udp protocol through described local area network (LAN) and terminal equipment, and digital television program stream that will be corresponding with described channel sends to terminal equipment.
Wherein, terminal equipment is set up TCP through described local area network (LAN) and receiving terminal for digital television and is linked and comprise:
Terminal equipment is broadcasted IP address discovery request message in described local area network (LAN);
After receiving terminal for digital television received described IP address discovery request message, secondary IP address was found to parse in the request message IP and is found request and the IP address of sending the terminal equipment of described IP address discovery request message;
Receiving terminal for digital television is found request in response to described IP, sends IP address discovery request-reply message to the terminal equipment that sends IP address discovery request message, and described IP address discovery request-reply message is packaged with the IP address of receiving terminal for digital television;
Described terminal equipment parses the IP address of receiving terminal for digital television from the IP address discovery request-reply message that receives, and initiates the TCP link to described receiving terminal for digital television.
Wherein, receiving terminal for digital television sends IP address discovery request-reply message and comprises to the terminal equipment that sends IP address discovery request message in response to described IP Address requests:
Receiving terminal for digital television is routed to the terminal equipment that sends described IP address discovery request message according to the IP address of sending the terminal equipment of described IP address discovery request message with IP address discovery request-reply message through described local area network (LAN).
Wherein, receiving terminal for digital television sends IP address discovery request-reply message and comprises to the terminal equipment that sends IP address discovery request message in response to described IP Address requests:
Receiving terminal for digital television is broadcasted described IP address discovery request-reply message in described local area network (LAN).
Wherein, terminal equipment is broadcasted IP address discovery request message and is comprised in described local area network (LAN):
Digital Television playing module in the described terminal equipment is broadcasted IP address discovery request message in described local area network (LAN).
Further, in response to described IP Address requests, send IP address discovery request-reply message before the terminal equipment that sends IP address discovery request message at receiving terminal for digital television, described method also comprises:
Receiving terminal for digital television parses the timestamp of the time of sending that shows this IP Address requests discovery message from described IP address discovery request message;
Receiving terminal for digital television sends IP address discovery request-reply message according to the before order backward of the time of sending of the indicated IP address discovery request message of described timestamp to corresponding terminal equipment.
Wherein, described receiving terminal for digital television receives the first and second road word TV signal, the first digital television signal is transported to the first communication forwarding module in the receiving terminal for digital television, and the second digital television signal is transported to second communication forwarding module and audio/video decoder simultaneously.
Wherein, described receiving terminal for digital television sends IP address discovery request-reply message to corresponding terminal equipment and comprises according to the before order backward of the time of sending of the indicated IP address discovery request message of described timestamp:
First that receiving terminal for digital television is pointed out to timestamp and second terminal equipment that sends IP address discovery request message send IP address discovery request-reply message;
The first digital television signal of the first communication forwarding module is distributed to the terminal equipment that first sends IP address discovery request message, the second digital television signal of second communication forwarding module is distributed to second terminal equipment that sends IP address discovery request message.
Wherein, described receiving terminal for digital television sends IP address discovery request-reply message to corresponding terminal equipment and comprises according to the before order backward of the time of sending of the indicated IP address discovery request message of described timestamp:
If the first and second digital television signals have been assigned to corresponding terminal equipment, described receiving terminal for digital television will not respond for the 3rd terminal equipment that sends IP address discovery request message;
If being assigned in the first and second digital television signals of corresponding terminal equipment has one to be released, described receiving terminal for digital television sends IP address discovery request-reply message to the 3rd terminal equipment that sends IP address discovery request message, and with in the first and second digital television signals d/d TV signal distribute to the 3rd terminal equipment that sends IP address discovery request message.
Further, described method comprises:
Terminal equipment is selected other channel and sends to receiving terminal for digital television to switch to carry out channel from described channel list.
According to another aspect of the present invention, also provide a kind of receiving terminal for digital television, comprised the first and second high frequency head modules, the first and second CA descrambling modules, and audio/video decoder, it is characterized in that, also comprise the first and second signal forwarding modules, network connecting module, wherein
The first and second high frequency head modules receive respectively and the first and second digital television signals are carried out frequency locking and demodulation;
The first and second CA modules receive respectively from the signal after the first and second high frequency head module frequency lockings and the demodulation and to the scrambled program in this signal and are decrypted the acquisition clear stream;
Described audio/video decoder receives from the first digital television signal of a CA module and decodes;
The first signal forwarding module is used for the first digital television signal is sent to local area network (LAN) through network connecting module;
Network connecting module links to each other with the first signal forwarding module, is used for being connected to router/switch.
Described receiving terminal for digital television further comprises: secondary signal forwarding module, an end are connected to the 2nd CA module, and the other end is connected to described network connecting module, are used for the second digital television signal is forwarded to local area network (LAN).
The present invention is owing to utilizing receiving terminal for digital television to receive 2 railway digital TV signal, and the two-way digital television signal is sent to corresponding terminal equipment in the local area network (LAN) by the first and second signal forwarding modules respectively, therefore the direct receiving digital television program of terminal equipment, the user can enjoy high-quality digital TV direct signal by terminal equipment.Simultaneously, the second railway digital TV signal can also send to audio/video decoder simultaneously, and by audio/video decoder digital television signal is sent to television set and watch for the user.The invention enables the user to watch digital television program by network, and can independently carry out the channel switching controls to the digital television program of watching and do not affect digital television program by television-viewing.
Description of drawings
Fig. 1 shows the structure calcspar of the receiving terminal for digital television of embodiments of the invention.
Fig. 2 shows the system schematic of transmitting digital television signal based on local area network (LAN) according to of the present invention.
Fig. 3 shows the schematic flow sheet based on the digital television signal retransmission method of local area network (LAN).
Fig. 4 shows according to the terminal equipment of the embodiment of the invention and sets up the process that TCP links through local area network (LAN) and receiving terminal for digital television.
Fig. 5 shows the form of IP address discovery request message.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to accompanying drawing and enumerate preferred embodiment, the present invention is described in more detail.Yet, need to prove, many details of listing in the specification only are in order to make the reader to one or more aspects of the present invention a thorough understanding be arranged, even if there are not these specific details also can realize these aspects of the present invention.
The terms such as " module " used in this application, " system " are intended to comprise the entity relevant with computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.For example, module can be, but be not limited in: the thread of the process of moving on the processor, processor, object, executable program, execution, program and/or computer.
At present, the technology of home network has obtained tremendous development.In the home network, communication link and speed between each equipment all hold good security.And also comparative maturity of the technology of digital TV set-top box can provide high-quality digital television signal.Therefore, if increase network function to join home network to digital TV set-top box, thereby digital television signal is forwarded on the home network, other-end equipment in the home network can pass through network direct viewing digital TV direct program so, thereby enjoy high-quality digital television signal.
Describe the technical scheme of the embodiment of the invention in detail below in conjunction with accompanying drawing.
Fig. 1 shows the structure calcspar of the receiving terminal for digital television of embodiments of the invention.Receiving terminal for digital television 10 can be processed the two-way digital video programs.In the digit receiving terminal, the first high frequency head module 11 and the second high frequency head module 12 are respectively applied to the first and second digital television signals are carried out frequency locking and demodulation.The one CA module 13 and the 2nd CA module 14 receive respectively from the signal after the first and second high frequency head module frequency lockings and the demodulation and to the scrambled program in this signal and are decrypted the acquisition clear stream.Audio/video decoder 15 be used for to receive from the second digital television signal of the 2nd CA module 14 and decodes.Decoded the second digital television signal is sent to TV by audio/video decoder 15.For the video frequency program in the second digital television signal, the user can control by common Infrared remote controller.First signal forwarding module 16 is used for receiving the first digital television signal from a CA module 13; Network connecting module 18 links to each other with first signal forwarding module 16, and can be linked to the router/switch 20 in the local area network (LAN).Network connecting module 18 has network connecting function, can link to local area network registration and with router/switch 20.The specific implementation of network connecting module 18 can adopt prior art, omits detailed description at this.During terminal equipment request digital television signal in local area network (LAN) is arranged, receiving terminal for digital television can be with the first digital television signal through network connecting module 18 and be forwarded to the terminal equipment 21 of request digital television signal through local area network (LAN).Alternatively, receiving terminal for digital television also comprises secondary signal forwarding module 17, and the one end is connected to the 2nd CA module 14 to receive the second digital television signal, and the other end is connected to network connecting module 18.Receiving terminal for digital television can be forwarded to the terminal equipment 21 of asking digital television signal with the second digital television signal through network connecting module 18 and through local area network (LAN).Network connecting module 18 has the function of order control, can guarantee the unobstructed packet loss of avoiding of network.For the video frequency program in the first digital television signal, be forwarded to other-end equipment by receiving terminal for digital television, other-end equipment can carry out Play Control to program.When receiving terminal for digital television had secondary signal forwarding module 17, the video frequency program in the second digital television signal also can be forwarded to other-end equipment by receiving terminal for digital television, and other-end equipment can carry out Play Control to video frequency program.
Fig. 2 shows the system schematic of transmitting digital television signal based on local area network (LAN) according to of the present invention.As shown in Figure 2, in the local area network (LAN) that is formed by receiving terminal for digital television 10, router/switch 20 and a plurality of terminal equipment 21, give in advance receiving terminal for digital television 10, router/switch 20 and terminal equipment 21 distributing IP addresses, finish the configuration of local area network (LAN).Among the present invention, local area network (LAN) can be family lan, also can be other local area network (LAN)s, and terminal equipment can be domestic terminal apparatus.
Receiving terminal for digital television 10 can receive the first and second digital television signals, is connected to router/switch 20 in the local area network (LAN) through network connecting module 18.Receiving terminal for digital television 10 is at first registered to local area network (LAN) after powering on.The first digital television signal can be forwarded on the local area network (LAN) by receiving terminal for digital television 10 after a CA module decrypts.The second digital television signal sends to audio/video decoder and decodes after the 2nd CA module decrypts, and decoded the first digital television signal can pass through the TV direct viewing.Alternatively, the second digital television signal can also send in the local area network (LAN) through secondary signal forwarding module 17 and network connecting module 18 after the 2nd CA module decrypts.Be sent to simultaneously at the second digital television signal under the situation of audio/video decoder 15 and secondary signal forwarding module 17, terminal equipment and television set can't be controlled respectively channel, and the two watches same program, and the operation such as channel switching also can occur synchronously.Obviously, the user can watch TV programme in the first digital television signal by network, and can independently carry out the channel switching controls to the TV programme in the first digital television signal of watching and do not affect TV programme in the second digital television signal of watching by television set 22.
The below describes the detailed process of transmitting based on the digital television signal of local area network (LAN) of the present invention in detail.
Fig. 3 shows the schematic flow sheet based on the digital television signal retransmission method of local area network (LAN).As shown in Figure 3, in step 310, terminal equipment 21 is set up TCP through described local area network (LAN) and receiving terminal for digital television and is linked.Set up after TCP is connected at terminal equipment 21 and receiving terminal for digital television 10, terminal equipment 21 sends to described receiving terminal for digital television 10 and obtains digital TV channel list commands, step 312.In response to obtaining the digital TV channel list commands, receiving terminal for digital television 10 sends to the digital TV channel tabulation and sends the terminal equipment 21 that obtains the digital TV channel list commands, step 314.According to channel list, the user can choose the channel that need to watch at terminal equipment.After the channel that user selection will be watched was also determined, the channel that terminal equipment 21 is watched needs sent selected channel.Selected channel is sent to receiving terminal for digital television 10, step 316 through router/switch 20.Receive after the selected channel, receiving terminal for digital television 10 in local area network (LAN) through router/switch 20 set up with terminal equipment 10 between the linking and data channel of udp protocol, and the data channel that digital television program that will be corresponding with selected channel flows by udp protocol sends to terminal equipment 21, step 318.At this moment, complete command channel and data channel in local area network (LAN), have been set up between terminal equipment 21 and the receiving terminal for digital television 10.In watching the process of digital television program, terminal equipment 21 can at any time be selected other channel and send to receiving terminal for digital television 10 to switch step 320 to carry out channel again from described channel list is selected.Receiving terminal for digital television 10 receives the channel after the switching each time, with switch after digital television program stream corresponding to channel send to terminal equipment 21.When user selection finishes to watch TV programme in the digital television signal by terminal equipment 21, the Digital Television playing module in the terminal equipment 21 will be closed data channel and command channel, then close link and the TCP link of udp protocol, step 322.
Fig. 4 shows according to the terminal equipment 21 of the embodiment of the invention and sets up the process that TCP links through local area network (LAN) and receiving terminal for digital television 10.In step 410, if the user wants to watch digital television program by terminal equipment 21, can utilize terminal equipment 21 in local area network (LAN), to broadcast IP address discovery request message.As shown in Figure 5, show the form of IP address discovery request message.IP address discovery request message comprises head, and device IP, IP are found request, timestamp and afterbody.Device IP is the IP address of terminal equipment 21 in local area network (LAN) of sending IP address discovery request message.Timestamp indicates the time of sending IP address discovery request message.Head and afterbody are respectively starting point and the terminal point that shows IP address discovery request message.
In step 412, after receiving terminal for digital television 10 received IP address discovery request message, secondary IP address was found to parse in the request message IP and is found request and the IP address of sending the terminal equipment of described IP address discovery request message.Receiving terminal for digital television 10 is found request in response to described IP, send IP address discovery request-reply message to the terminal equipment 21 that sends IP address discovery request message, described IP address discovery request-reply message is packaged with the IP address of receiving terminal for digital television 10, step 414.Terminal equipment 21 parses the IP address of receiving terminal for digital television 10 from the IP address discovery request-reply message that receives, and initiates TCP link, step 416 to described receiving terminal for digital television 10.
Among the present invention, receiving terminal for digital television 10 sends IP address discovery request-reply message has various ways to the terminal equipment 21 that sends IP address discovery request message.A kind of mode is: receiving terminal for digital television 10 is routed to the terminal equipment 21 that sends described IP address discovery request message according to the IP address of sending the terminal equipment of described IP address discovery request message with the router/switch 20 of IP address discovery request-reply message in described local area network (LAN).In the another kind of mode, receiving terminal for digital television 10 is broadcasted described IP address discovery request-reply message in described local area network (LAN).Under this situation, as long as this moment, terminal equipment 21 powered on, no matter whether it sends IP address discovery request message, all know the IP address of receiving terminal for digital television 10.Like this, do not wish to watch after a while digital television program if send the terminal equipment 21 of IP address discovery request message, no longer need again broadcasting IP address discovery request message in network, but can directly utilize the IP address of the receiving terminal for digital television 10 of having known, directly request is set up and is connected with the TCP of receiving terminal for digital television, and then execution method flow as shown in Figure 3 is to obtain digital television program.
In the embodiments of the invention, dispose the Digital Television playing module in the terminal equipment 21.The user wishes to watch digital television program by terminal equipment 21 each time, and the Digital Television playing module in the terminal equipment 21 then is activated with broadcasting IP address discovery request message in local area network (LAN).
Can dispose a plurality of terminal equipments 21 in the local area network (LAN).In order to guarantee the unobstructed and not frame losing of Frame of link, receiving terminal for digital television 10 responds simultaneously the IP Address requests of 2 terminal equipments 21 and allows 2 terminal equipments, 21 receiving digital television programs at most.Therefore, if receiving terminal for digital television 10 receives IP address discovery request message, before sending IP address discovery request-reply message, receiving terminal for digital television 10 at first parses the timestamp of the time of sending that shows this IP address discovery request message from the IP address discovery request message that receives.In the situation that a plurality of terminal equipments 21 send IP address discovery request message, receiving terminal for digital television 10 will receive a plurality of IP address discovery request messages.Receiving terminal for digital television 10 according to the ordering of the order after arrive first, and sends IP address discovery request-reply message to corresponding terminal equipment with the timestamp in each IP address discovery request message.
In the embodiments of the invention, receiving terminal for digital television 10 receives the first and second road word TV signal, the first digital television signal is transported to the first communication forwarding module in the receiving terminal for digital television, and the second digital television signal can be transported to second communication forwarding module and audio/video decoder simultaneously.First that receiving terminal for digital television is pointed out to timestamp and second terminal equipment 21 that sends IP address discovery request message send IP address discovery request-reply message, and the first digital television signal of the first communication forwarding module is distributed to the terminal equipment that first sends IP address discovery request message, the second digital television signal of second communication forwarding module is distributed to second terminal equipment that sends IP address discovery request message.
During IP address discovery request message after receiving terminal for digital television 10 receives the 3rd or the 3rd, receiving terminal for digital television 10 judges whether the first and second digital television signals have been assigned to corresponding terminal equipment 21.If the first and second digital television signals have been assigned to corresponding terminal equipment, receiving terminal for digital television 10 will not respond for the 3rd terminal equipment 21 that sends IP address discovery request message; If being assigned in the first and second digital television signals of corresponding terminal equipment 21 has one to be released, receiving terminal for digital television 10 sends IP address discovery request-reply message to the 3rd terminal equipment that sends IP address discovery request message, and with in the first and second digital television signals d/d TV signal distribute to the 3rd terminal equipment that sends IP address discovery request message.
The embodiment of the invention is owing to utilizing receiving terminal for digital television to receive 2 railway digital TV signal, and the two-way digital television signal is sent to corresponding terminal equipment in the local area network (LAN) by the first and second signal forwarding modules respectively, therefore the direct receiving digital television program of terminal equipment, the user can enjoy high-quality digital TV direct signal by terminal equipment.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. method of transmitting digital television signal based on local area network (LAN) comprises step:
Terminal equipment is set up TCP through described local area network (LAN) and receiving terminal for digital television and is linked;
Terminal equipment sends to described receiving terminal for digital television and obtains the digital TV channel list commands;
In response to the described digital TV channel list commands of obtaining, receiving terminal for digital television sends to terminal equipment with the digital TV channel tabulation;
Terminal equipment is chosen the channel of needs broadcast and corresponding channel is sent to described receiving terminal for digital television from channel list;
Receiving terminal for digital television is set up data channel based on udp protocol through described local area network (LAN) and terminal equipment, and digital television program stream that will be corresponding with described channel sends to terminal equipment.
2. the method for claim 1, wherein terminal equipment is set up TCP through described local area network (LAN) and receiving terminal for digital television and is linked and comprise:
Terminal equipment is broadcasted IP address discovery request message in described local area network (LAN);
After receiving terminal for digital television received described IP address discovery request message, secondary IP address was found to parse in the request message IP and is found request and the IP address of sending the terminal equipment of described IP address discovery request message;
Receiving terminal for digital television is found request in response to described IP, sends IP address discovery request-reply message to the terminal equipment that sends IP address discovery request message, and described IP address discovery request-reply message is packaged with the IP address of receiving terminal for digital television;
Described terminal equipment parses the IP address of receiving terminal for digital television from the IP address discovery request-reply message that receives, and initiates the TCP link to described receiving terminal for digital television.
3. method as claimed in claim 2, wherein, receiving terminal for digital television sends IP address discovery request-reply message and comprises to the terminal equipment that sends IP address discovery request message in response to described IP Address requests:
Receiving terminal for digital television is routed to the terminal equipment that sends described IP address discovery request message according to the IP address of sending the terminal equipment of described IP address discovery request message with IP address discovery request-reply message through described local area network (LAN).
4. method as claimed in claim 2, wherein, receiving terminal for digital television sends IP address discovery request-reply message and comprises to the terminal equipment that sends IP address discovery request message in response to described IP Address requests:
Receiving terminal for digital television is broadcasted described IP address discovery request-reply message in described local area network (LAN).
5. method as claimed in claim 2 in response to described IP Address requests, sends IP address discovery request-reply message before the terminal equipment that sends IP address discovery request message at receiving terminal for digital television, also comprises:
Receiving terminal for digital television parses the timestamp of the time of sending that shows this IP Address requests discovery message from described IP address discovery request message;
Receiving terminal for digital television sends IP address discovery request-reply message according to the before order backward of the time of sending of the indicated IP address discovery request message of described timestamp to corresponding terminal equipment.
6. method as claimed in claim 5, wherein, described receiving terminal for digital television receives the first and second road word TV signal, the first digital television signal is transported to the first communication forwarding module in the receiving terminal for digital television, and the second digital television signal is transported to second communication forwarding module and audio/video decoder simultaneously.
7. method as claimed in claim 6, wherein, described receiving terminal for digital television sends IP address discovery request-reply message to corresponding terminal equipment and comprises according to the before order backward of the time of sending of the indicated IP address discovery request message of described timestamp:
First that receiving terminal for digital television is pointed out to timestamp and second terminal equipment that sends IP address discovery request message send IP address discovery request-reply message;
The first digital television signal of the first communication forwarding module is distributed to the terminal equipment that first sends IP address discovery request message, the second digital television signal of second communication forwarding module is distributed to second terminal equipment that sends IP address discovery request message.
8. method as claimed in claim 7, wherein, described receiving terminal for digital television sends IP address discovery request-reply message to corresponding terminal equipment and comprises according to the before order backward of the time of sending of the indicated IP address discovery request message of described timestamp:
If the first and second digital television signals have been assigned to corresponding terminal equipment, described receiving terminal for digital television will not respond for the 3rd terminal equipment that sends IP address discovery request message;
If being assigned in the first and second digital television signals of corresponding terminal equipment has one to be released, described receiving terminal for digital television sends IP address discovery request-reply message to the 3rd terminal equipment that sends IP address discovery request message, and with in the first and second digital television signals d/d TV signal distribute to the 3rd terminal equipment that sends IP address discovery request message.
9. a receiving terminal for digital television comprises the first and second high frequency head modules, and the first and second CA descrambling modules, and audio/video decoder is characterized in that, also comprises the first and second signal forwarding modules, network connecting module, wherein,
The first and second high frequency head modules receive respectively and the first and second digital television signals are carried out frequency locking and demodulation;
The first and second CA modules receive respectively from the signal after the first and second high frequency head module frequency lockings and the demodulation and to the scrambled program in this signal and are decrypted the acquisition clear stream;
Described audio/video decoder receives from the first digital television signal of a CA module and decodes;
The first signal forwarding module is used for the first digital television signal is sent to local area network (LAN) through network connecting module;
Network connecting module links to each other with the first signal forwarding module, is used for being connected to router/switch.
10. receiving terminal for digital television as claimed in claim 9 further comprises:
Secondary signal forwarding module, an end are connected to the 2nd CA module, and the other end is connected to described network connecting module, are used for the second digital television signal is forwarded to local area network (LAN).
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| CN2012104418864A CN102932689A (en) | 2012-11-07 | 2012-11-07 | Local area network (LAN) based method for transmitting digital television signal and digital television receiving terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103561316A (en) * | 2013-11-22 | 2014-02-05 | 中国科学院声学研究所 | Method and device for transmitting video and audio information |
| CN103686329A (en) * | 2013-12-20 | 2014-03-26 | 乐视致新电子科技（天津）有限公司 | Synchronous control method and system, smart television and wearable device |
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