CN101083509B - Local information broadcast system, and broadcast device andbroadcast method thereof - Google Patents
Local information broadcast system, and broadcast device andbroadcast method thereof Download PDFInfo
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- CN101083509B CN101083509B CN2007101087657A CN200710108765A CN101083509B CN 101083509 B CN101083509 B CN 101083509B CN 2007101087657 A CN2007101087657 A CN 2007101087657A CN 200710108765 A CN200710108765 A CN 200710108765A CN 101083509 B CN101083509 B CN 101083509B
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- 238000000034 method Methods 0.000 title claims description 21
- 238000004891 communication Methods 0.000 claims abstract description 49
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
- H04N21/25808—Management of client data
- H04N21/25841—Management of client data involving the geographical location of the client
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
- H04N21/26266—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists for determining content or additional data repetition rate, e.g. of a file in a DVB carousel according to its importance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
- H04N7/17309—Transmission or handling of upstream communications
- H04N7/17336—Handling of requests in head-ends
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Computer Graphics (AREA)
- Mobile Radio Communication Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
To provide a local information broadcast system capable of easily broadcasting local information to an arbitrary area.In a local information broadcast system, a content distribution center 3 distributes broadcast contents of local information to broadcast devices 11-1n arranged in a service area via a master station 2. Each of the broadcast devices 11-1n receives the distributed contents by a communication unit 111, stores the contents in a storage unit 112, cyclically outputs the stored contents, converts the contents into broadcast signals in a transmission system of a digital broadcast, broadcasts the broadcast signals to the service area by a transmission unit 114, and provides a receiving terminal 4 capable of receiving digital broadcast in the service area of the local information.
Description
Cross Reference to Related Applications
This application is based on and claims priority from prior japanese patent application No. 2006-152779 filed on 31/5/2006, the entire contents of which are incorporated herein by reference.
Technical Field
The present invention relates to a local information broadcasting system for easily broadcasting local broadcast content to an arbitrary area, and a broadcasting apparatus and a broadcasting method suitable for use in the system.
Background
Conventionally, there has been proposed a service for broadcasting local broadcast content to an arbitrary area using an existing broadcast infrastructure, for example, broadcasting video/audio for introducing an event or a product to an area such as an event venue or a shopping mall. As an example, japanese patent application laid-open No. 2000-244383 discloses a technique for providing a local broadcast material without newly installing a transmission/reception device by using a retransmission device for retransmitting a satellite broadcast wave to an insensitive area in a satellite broadcast system for a moving body using CDM (Code Division multiplexing). This method of providing a broadcast signal is to arrange a retransmission device that retransmits a satellite broadcast wave in an arbitrary area, transmit local broadcast content to the retransmission device, and broadcast the broadcast content in a CDM system by multiplexing the broadcast content on the satellite broadcast wave. However, this method requires the retransmission apparatus to have a function of multiplexing broadcast contents in a satellite broadcast wave in a CDM system. Further, this method is premised on re-transmission of satellite broadcast waves, and is not suitable for the case where only local broadcast content is broadcast.
Disclosure of Invention
The invention provides a local information broadcasting system, a broadcasting device and a broadcasting method capable of easily broadcasting local information to any area.
The local information broadcasting system of the present invention includes: a content distribution center that distributes broadcast content based on arbitrary local information and control information that controls editing of the broadcast content and transmission of a broadcast signal; a master station for transmitting the broadcast content and the control information distributed from the content distribution center to an arbitrary service area; a broadcasting device which is disposed in the arbitrary service area, is connected to the master station via a communication path, receives broadcast content and control information distributed from the content distribution center via the master station, converts the broadcast content into a broadcast signal based on a digital broadcast transmission scheme used in the local service area based on the control information, and broadcasts the broadcast signal to the local service area; and a receiving terminal for receiving a broadcast signal transmitted from the broadcasting device when entering the service area; wherein, above-mentioned broadcaster includes: a communication unit configured to receive the broadcast content and control information distributed from the content distribution center via the master station, and generate, based on the control information, edit control information for editing the broadcast content and transmission control information for turning on/off transmission of the broadcast signal; a storage unit for editing and storing the broadcast content received by the communication unit based on the editing control information; an output unit that periodically reads and outputs the broadcast content stored in the storage unit; and a transmitting unit that converts the broadcast content that is periodically output into a broadcast signal of a frequency that is allocated in advance in the digital broadcast transmission system, and transmits the broadcast signal in accordance with the on/off instruction of the transmission control information.
A broadcasting apparatus according to the present invention is a broadcasting apparatus for a local information broadcasting system, which receives broadcast content based on arbitrary local information distributed from a content distribution center via a master station and control information for controlling editing of the broadcast content and transmission of a broadcast signal, and broadcasts the broadcast content to a predetermined local service area, the broadcasting apparatus being disposed in the local service area, the broadcasting apparatus including: a communication unit configured to receive broadcast content and control information based on the local information distributed from the content distribution center, and generate edit control information for editing the broadcast content and transmission control information for turning on/off transmission of the broadcast signal based on the control information; a storage unit for editing and storing the broadcast content received by the communication unit based on the editing control information; an output unit that periodically reads and outputs the broadcast content stored in the storage unit; and a transmission unit that converts the periodically outputted broadcast content into a broadcast signal based on a digital broadcast transmission scheme used in the local service area, and transmits the broadcast signal to the local service area in accordance with an on/off instruction of the transmission control information.
A broadcasting method according to the present invention is a broadcasting method used in a local information broadcasting system including a master station that transmits, to an arbitrary local service area, broadcast content based on arbitrary local information distributed from a content distribution center and control information for controlling editing of the broadcast content and transmission of a broadcast signal, the broadcasting method receiving the broadcast content and the control information transmitted from the master station and broadcasting the received broadcast content and the control information to the local service area, the broadcasting method including: receiving the broadcast content and control information distributed from the content distribution center via the master station; generating edit control information for editing the broadcast content and transmission control information for turning on/off transmission of the broadcast signal based on the control information; editing and storing the broadcast content based on the editing control information; periodically reading and outputting the stored broadcast content; and converting the periodically outputted broadcast content into a broadcast signal based on a digital broadcast transmission scheme used in the local service area, and transmitting the broadcast signal in accordance with the on/off instruction of the transmission control information.
Advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The advantages of the invention will be realized and attained by means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with a general description given above and the detailed description given below, serve to explain the principles of the invention.
Fig. 1 is a block diagram showing a configuration of a local information broadcasting system including a broadcasting device of the present invention.
Fig. 2 is a flowchart showing the processing procedure of the broadcasting apparatus.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings.
Fig. 1 is a block diagram showing a configuration of a local information broadcasting system including a broadcasting device of the present invention.
In fig. 1, broadcasting devices 11 to 1n (n is an arbitrary natural number) are installed in one or more service areas for local broadcasting, such as an underground street or a shopping center in a large building, and broadcast the assigned broadcast content to the service areas in a digital broadcasting manner used in the installed service areas. The broadcasting devices 11 to 1n provided in each service area are connected to the master station 2 via communication paths A1 to An, respectively.
The master station 2 is connected to the content distribution center 3 via a communication path B, controls communication between the broadcasting devices 11 to 1n and the content distribution center 3, and a transmission device such as a radio base station or a transmission terminal station device corresponds to the master station 2.
The content distribution center 3 corresponds to a studio of a broadcasting station, and distributes local broadcast content and control information for controlling processes such as editing and transmission of the broadcasting devices 11 to 1n to the broadcasting devices 11 to 1n via the master station 2. Broadcast monitoring information transmitted from the broadcasting devices 11 to 1n is received via the master station 2.
The broadcasting devices 11 to 1n have the same structure. The following describes the configuration of the broadcasting apparatus 11 as a representative example.
The broadcasting device 11 includes a communication unit 111, and the communication unit 111 functions as a slave station for wireless communication or a network interface device for a wired system. The communication unit 111 performs data communication with the master station 2, and receives broadcast content and control information distributed from the content distribution center 3. Then, based on the control information, for example, edit control information for the content edit/storage section 112 is generated, and transmission on/off control information for a power amplifier 114C described later is generated. The broadcast content received by the communication unit 111 is transmitted to the content editing/storing unit 112 together with the editing control information.
The content editing/storing unit 112 edits the broadcast content into a predetermined local broadcast program based on the editing control information, and sequentially stores the edited program. The broadcast content stored in the content editing/storing section 112 is periodically read out by the periodic output section 113 and transmitted to the transmitting device 114.
As the transmission device 114, a device for broadcasting used in an area where the broadcasting device 11 is installed, for example, a device for terrestrial digital broadcasting having a strong anti-multipath reflection or interference capability is used. Next, the present embodiment will be described by taking as an example a case where a transmitting apparatus for terrestrial digital broadcasting is used.
The transmitting device 114 allocates input content to a predetermined carrier wave by an OFDM (orthogonal frequency Division multiplexing) modulator 114A, performs OFDM modulation, and converts the obtained OFDM modulated signal into a broadcast frequency allocated in advance by a frequency converter 114B. Then, when the transmission on/off control information from the communication unit 111 instructs transmission on, the power amplifier 114C power-amplifies the OFDM modulated signal converted to the broadcast frequency, and transmits the signal as a terrestrial digital broadcast signal from the antenna 115 as a weak radio wave having a coverage area of about 100 meters, for example. The radio wave can be received and demodulated by a receiving terminal 4 such as a receiver for terrestrial digital broadcasting or a mobile phone terminal compatible with terrestrial digital broadcasting.
As described above, the broadcasting device 11 including the transmitting device 114 for terrestrial digital broadcasting is installed in a service area where it is difficult to receive terrestrial digital broadcasting waves, such as a building including a shopping mall or a large store, or an underground shopping mall, and can be regarded as a small broadcasting station covering the service area. When the receiving terminal 4 enters the service area where the terrestrial digital broadcast wave received by the receiving terminal 4 cannot reach, the digital broadcast wave of the new content in the service area is received instead of the terrestrial digital broadcast wave received before.
The processing steps of the broadcasting apparatus 11 described above are shown in fig. 2. In fig. 2, first, the communication unit 111 monitors the reception status of the broadcast content received from the communication path a1 (step S1), and when the broadcast content is received, the received broadcast content is transmitted to the content editing/storing unit 112 and stored (step S2).
The content storage status of the content editing/storing unit 112 is monitored by the periodic output unit 113 (S3), and when broadcast content is stored, the periodic output unit 113 periodically reads the content, and the transmitting device 114 converts the content into a terrestrial digital broadcast signal and transmits the terrestrial digital broadcast signal (step S4).
The content output status in step S4 is monitored by the communication unit 111 (step S5), and when the output is completed, the process returns to the content storage monitoring in step S3 and continues.
Further, the digital broadcast wave transmitted by the broadcasting device 11 need not be limited to be operated at the channel frequency of one broadcasting station of the terrestrial digital broadcast operated in the area where the transmitting device 114 is located, and if a plurality of stations are operated, the broadcast content can be viewed and listened to regardless of the channel frequency at which the broadcast content is received when operated at several channel frequencies corresponding to the stations, and the operation of selecting a station by the user can be simplified.
The broadcast content transmitted periodically may be stored in the content storage unit 112 as one program, for example, and may be sequentially overwritten and updated by the broadcast content newly received by the communication unit 111 from the communication path a 1. As another method, the broadcast content may be stored and managed in the content editing/storing unit 112 in a plurality of program units, and the periodic output unit 113 may select a program specified by the control information from the content distribution center 3 from among the plurality of programs stored in the content editing/storing unit 112 and periodically transmit the selected program.
According to the broadcasting apparatus configured as described above, the distributed broadcast content is received through the communication paths a1 to An, B, automatically stored, and periodically outputted to be broadcast as a terrestrial digital broadcast. Therefore, it is possible to view and listen to the broadcast content by using the receiving terminal 4 corresponding to the reception of the terrestrial digital broadcast, which has recently become widespread.
Therefore, in a service area where the communication paths a1 to An can be laid, local broadcast content in the service area can be easily broadcast only by disposing the broadcast apparatus 11 at An arbitrary place.
The signal format, modulation scheme, and the like of the terrestrial digital broadcasting are determined according to the specifications applied to the country, region, and the like in which the broadcasting device is installed. As the digital broadcasting, for example, there are a system using only 1 segment of OFDM, a DMB system, and the like, but it is preferable to adopt a digital broadcasting system having a strong capability of resisting multipath reflection, interference, and the like occurring in a service area such as a building.
On the contrary, in the case where terrestrial digital broadcasting is not applied, although the interference resistance performance and the like are deteriorated, a broadcasting system to which an existing broadcast wave such as AM or FM is applied is targeted for the present invention. In the case where the receiving terminal 4 is a mobile phone terminal, it is needless to say that details are omitted because they can be easily analogized to conventional broadcast waves.
In the above configuration, the communication unit 111 transmits information on the content stored in the content editing/storing unit 112 to the content distribution center 3 via the master station 2, and when an instruction for unnecessary content is received from the content distribution center 3, the instructed content is deleted in the content editing/storing unit 112. Thereby, the content distribution center 3 can control the content storage in the broadcasting apparatus 11.
Further, the communication unit 111 selectively stops the output of the power amplifier 114C when receiving control information instructing on/off of transmission from the content distribution center 3. This enables remote stop of content broadcast by the broadcast apparatus 11 from the content distribution center 3.
The communication path a1 may be a wired transmission line using a communication cable including an optical fiber or a coaxial cable capable of broadband communication, or may be a user system communication network implemented wirelessly.
In a wireless system, communication can be performed by a user system implemented by FWA (Fixed wireless access), a mobile phone line, a user system using a mobile phone line, or the like. However, in consideration of communication costs, device costs, the above-mentioned constant connectivity, and traffic securing, among others, a user system communication network using WiMAX (Worldwide Interoperability for microwave Access) which has recently become popular is excellent in overall performance.
That is, WiMAX is not limited to a narrow space such as a wireless Local Area Network (LAN) in which broadband wireless communication can be performed in a wide range having a radius of several tens of kilometers. Therefore, the station arrangement design of the master station 2 and the broadcasting device 11 provided near the content distribution center 3 becomes easy. Thus, the broadcasting device 11 can be disposed at an arbitrary position within the WiMAX coverage area, and the laying of the communication cable described above can be omitted, and the content can be distributed in a broadband from the master station 2.
Furthermore, if WiMAX is used, the installation position of the broadcasting device 11 becomes free and connection can be performed constantly. Therefore, with the communication path a1, the traffic for content distribution can be easily ensured.
Other advantages and variations will be apparent to those skilled in the art. The invention in its broader aspects is therefore not limited to the specific details and embodiments shown and described herein. Thus, various modifications may be made without departing from the general inventive concept as defined by the claims and their equivalents.
Claims (9)
1. A local information broadcasting system comprising:
a content distribution center that distributes broadcast content based on arbitrary local information and control information that controls editing of the broadcast content and transmission of a broadcast signal;
a master station for transmitting the broadcast content and the control information distributed from the content distribution center to an arbitrary local service area;
a broadcasting device which is disposed in the arbitrary local service area, is connected to the master station via a communication path, receives broadcast content and control information distributed from the content distribution center via the master station, converts the broadcast content into a broadcast signal based on a digital broadcast transmission scheme used in the local service area based on the control information, and broadcasts the broadcast signal to the local service area; and
a receiving terminal for receiving a broadcast signal transmitted from the broadcasting device when entering the service area; wherein,
the broadcasting device includes: a communication unit configured to receive the broadcast content and control information distributed from the content distribution center via the master station, and generate, based on the control information, edit control information for editing the broadcast content and transmission control information for turning on/off transmission of the broadcast signal; a storage unit for editing and storing the broadcast content received by the communication unit based on the editing control information; an output unit that periodically reads and outputs the broadcast content stored in the storage unit; and a transmitting unit that converts the broadcast content that is periodically output into a broadcast signal of a frequency that is allocated in advance in the digital broadcast transmission system, and transmits the broadcast signal in accordance with the on/off instruction of the transmission control information.
2. The local information broadcasting system of claim 1,
the receiving terminal is a mobile phone terminal having a receiving function of receiving a broadcast signal of the digital broadcast.
3. The local information broadcasting system of claim 1,
the communication path is any one of the following: a subscriber system communication network of a wired system using an optical fiber or coaxial cable, a private line, a subscriber system communication network of a wireless system using FWA or WiMAX, a mobile phone line, or a subscriber system communication network using a mobile phone line.
4. The local information broadcasting system of claim 1,
the above digital broadcasting is terrestrial digital broadcasting.
5. A broadcasting apparatus for use in a local information broadcasting system, the broadcasting apparatus receiving broadcast content based on arbitrary local information distributed from a content distribution center via a master station and control information for controlling editing of the broadcast content and transmission of a broadcast signal, and broadcasting to a predetermined local service area, the broadcasting apparatus being disposed in the local service area, the broadcasting apparatus comprising:
a communication unit configured to receive broadcast content and control information based on the local information distributed from the content distribution center, and generate edit control information for editing the broadcast content and transmission control information for turning on/off transmission of the broadcast signal based on the control information;
a storage unit for editing and storing the broadcast content received by the communication unit based on the editing control information;
an output unit that periodically reads and outputs the broadcast content stored in the storage unit; and
and a transmitting unit that converts the periodically outputted broadcast content into a broadcast signal based on a digital broadcast transmission scheme used in the local service area, and transmits the broadcast signal to the local service area in accordance with the on/off instruction of the transmission control information.
6. The broadcasting apparatus according to claim 5,
the broadcasting device is connected to the master station via a communication path, and the communication path is any one of: a subscriber system communication network of a wired system using an optical fiber or coaxial cable, a private line, a subscriber system communication network of a wireless system using FWA or WiMAX, a mobile phone line, or a subscriber system communication network using a mobile phone line.
7. The broadcasting apparatus according to claim 5,
the above-mentioned digital broadcasting is terrestrial digital broadcasting,
the transmitting unit converts the broadcast content into a broadcast signal based on the terrestrial digital broadcasting transmission system and transmits the broadcast signal.
8. A broadcasting method used in a local information broadcasting system having a master station that transmits, to an arbitrary local service area, broadcast content based on arbitrary local information distributed from a content distribution center and control information for controlling editing of the broadcast content and transmission of a broadcast signal, the broadcasting method receiving the broadcast content and the control information transmitted from the master station and broadcasting the same to the local service area, the broadcasting method comprising:
receiving the broadcast content and control information distributed from the content distribution center via the master station;
generating edit control information for editing the broadcast content and transmission control information for turning on/off transmission of the broadcast signal based on the control information;
editing and storing the broadcast content based on the editing control information;
periodically reading and outputting the stored broadcast content; and
the broadcast content that is periodically outputted is converted into a broadcast signal based on a digital broadcast transmission scheme used in the local service area, and the broadcast signal is transmitted in accordance with the on/off instruction of the transmission control information.
9. The broadcasting method of claim 8,
the above-mentioned digital broadcasting is terrestrial digital broadcasting,
and converting the broadcast content into a broadcast signal based on the terrestrial digital broadcasting transmission method and transmitting the broadcast signal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP152779/2006 | 2006-05-31 | ||
| JP2006152779 | 2006-05-31 | ||
| JP2007134569A JP2008011510A (en) | 2006-05-31 | 2007-05-21 | Local information broadcast system, and broadcast device and broadcast method thereof |
| JP134569/2007 | 2007-05-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101083509A CN101083509A (en) | 2007-12-05 |
| CN101083509B true CN101083509B (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101087657A Expired - Fee Related CN101083509B (en) | 2006-05-31 | 2007-05-31 | Local information broadcast system, and broadcast device andbroadcast method thereof |
Country Status (2)
| Country | Link |
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| JP (1) | JP5017479B2 (en) |
| CN (1) | CN101083509B (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2859786B2 (en) * | 1992-09-17 | 1999-02-24 | 富士通株式会社 | Wireless communication system |
| JPH06209301A (en) * | 1992-10-23 | 1994-07-26 | Stanley Electric Co Ltd | Led character broadcast system |
| US5510828A (en) * | 1994-03-01 | 1996-04-23 | Lutterbach; R. Steven | Interactive video display system |
| JP2001331138A (en) * | 2000-05-22 | 2001-11-30 | Shigeru Adachi | Advertising media transmission system, and systems for observing earthquake, weather, and environment using the same |
| JP2003110512A (en) * | 2001-09-28 | 2003-04-11 | Toshiba Corp | Digital broadcasting system, digital broadcasting method, local broadcasting facility device therefor, and wide area broadcasting facility device |
| JP2003234712A (en) * | 2002-02-08 | 2003-08-22 | Hitachi Kokusai Electric Inc | Broadcasting system |
| JP2004032160A (en) * | 2002-06-24 | 2004-01-29 | Toppan Printing Co Ltd | Wayside area information guidance system, portable receiver and wayside area information guiding method |
| JP2004135171A (en) * | 2002-10-11 | 2004-04-30 | Sony Corp | Digital broadcasting system, main distribution apparatus, sub distribution apparatus, broadcast contents distributing method, and broadcast contents editing method |
| JP2005092483A (en) * | 2003-09-17 | 2005-04-07 | Yoshiyuki Kajino | System for audio guidance of guidance target place |
| JP2005203911A (en) * | 2004-01-14 | 2005-07-28 | Nec Corp | In-train broadcast system and broadcast method thereof |
| JP4606185B2 (en) * | 2005-02-01 | 2011-01-05 | 日本テレビ放送網株式会社 | Relay system and relay method, transmitting station and relay station |
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- 2007-05-31 CN CN2007101087657A patent/CN101083509B/en not_active Expired - Fee Related
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2011
- 2011-05-02 JP JP2011103167A patent/JP5017479B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101083509A (en) | 2007-12-05 |
| JP2011193509A (en) | 2011-09-29 |
| JP5017479B2 (en) | 2012-09-05 |
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