JP2007142677A - Mobile communication terminal, digital broadcast complement apparatus, and digital broadcast complement system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication terminal capable of continuously viewing and reproducing digital broadcast without interruption and suppressing a communication cost of wireless communication and to provide an apparatus and a system for complementing digital broadcast. <P>SOLUTION: The mobile phone terminal (mobile communication terminal ) MS making wireless communication with a base station BTS and the digital broadcast complement apparatus 3 connected to the base station BTS are respectively receptible of digital broadcast. The mobile phone terminal MS decodes TS packets of the digital broadcast, detects a packet ID from undecodable TS packets and wirelessly transmits the packet ID to the digital broadcast complement apparatus 3 as wireless communication data via a mobile telephone line network. The digital broadcast complement apparatus 3 detects the TS packets corresponding to the received packet ID from a digital broadcast data storage and transmits the TS packets to the mobile phone terminal MS via the mobile telephone line network as wireless communication data. The mobile phone terminal MS uses the received TS packets to complement the digital broadcast and views and reproduces the complemented digital broadcast. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a portable communication terminal for performing wireless communication via a base station and receiving and viewing a digital broadcast from a broadcast station. More specifically, the present invention relates to an apparatus and system on the base station side that provides a service for a mobile communication terminal that receives the digital broadcast.

  2. Description of the Related Art Conventionally, various mobile communication terminals such as mobile phone terminals have been devised that can receive digital broadcasts such as television (TV) broadcasts and radio broadcasts in addition to transmitting and receiving wireless communication data.

  As a device having such circuits for wireless communication and digital broadcast reception in one housing, there is a mobile phone terminal with TV, and various services have been devised along with the start of terrestrial digital TV broadcast. Yes.

  In Patent Document 1, electronic program information is acquired from a digital TV broadcast using a mobile phone terminal with TV, displayed on the screen of the mobile phone terminal with TV, and a program recording command for a video device installed at home is attached to the TV. A configuration is shown in which transmission is performed via a cellular phone network in accordance with a user operation of the cellular phone terminal.

Also, in Patent Document 2, a content portion that the user has missed is specified for the content of the digital TV broadcast that the user has viewed using the mobile phone terminal with TV, and the content portion is digest edited and edited at high speed. A configuration is shown in which a mobile phone terminal with a TV acquires the service content according to a user operation via a mobile phone line network, and the user views the service content using the mobile phone terminal with a TV.
JP 2002-353915 A JP 2004-349932 A

  By the way, as a feature of digital broadcasting such as digital TV broadcasting, it is possible to realize extremely excellent communication quality by performing multiple error correction coding (FEC).

  However, since a mobile communication terminal such as a mobile phone terminal with a TV is a digital broadcast, the deterioration of the reception state cannot be completely avoided, and the terminal itself moves to the shadow of a building or the like. In some cases, noise, interference, and attenuation of transmitted waves become stronger, and the reception status of digital broadcasting deteriorates.

  When such a problem occurs, it is possible to view the broadcast again using the techniques of the above-mentioned Patent Document 1 and Patent Document 2, but from the viewer's standpoint, such an operation is necessary. In addition, there has been a strong demand for mobile phone terminals that can be viewed in real time without interruption.

  In addition, when some service content is acquired as wireless communication data from a cellular phone line network or the like as in the service of Patent Document 2, the communication cost generally increases with the amount of information used. It is also necessary to reduce the amount of information.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a portable communication terminal that can continuously view and play back a digital broadcast without interruption, and suppresses the communication cost of wireless communication. In addition, an apparatus and system for complementing the digital broadcast are provided.

  The present invention provides a mobile communication terminal comprising: a digital broadcast receiving unit that receives digital broadcast data broadcast from a broadcast station; and a wireless communication unit that transmits and receives wireless communication data to and from a base station. A data string acquisition means for requesting and acquiring a data string of digital broadcast data that cannot be correctly decoded by the wireless communication section as the wireless communication data, and a complement means for complementing the digital broadcast data with the acquired data string And a viewing / reproducing means for viewing / reproducing the complemented digital broadcast data.

  In this configuration, a data string of digital broadcast data that cannot be correctly decoded is acquired as wireless communication data using a wireless communication network, and the digital broadcast data is complemented. As a result, the mobile communication terminal can continuously perform viewing and reproduction without interruption, and only the data string that cannot be correctly decoded is acquired as wireless communication data, so that communication costs, particularly reception costs, can be suppressed. In addition, the digital broadcast can be continuously viewed and reproduced without requiring any operation from the viewer.

  Generally, in digital broadcasting, content data is encoded by a packet system determined by the MPEG (Moving Picture Experts Group) standard, and each packet has an individual identification code (packet ID) or FEC (packet ID). An error correction code such as Forward Error Correction) is added to the packet header.

  Therefore, when receiving such a packet-type digital broadcast, a bit error correction using an error correction code (FEC) is performed, and a packet (error packet) that cannot be decoded yet is transmitted wireless data in the present invention. Is acquired via a wireless communication network. Then, the error packet is replaced with a packet acquired as wireless communication data, and error correction is performed. Thereby, in the mobile communication terminal, viewing / playback is not interrupted by the error packet, and digital broadcast content data can be played back continuously. Further, since the digital broadcast processing unit acquires only the packet corresponding to the error packet as the wireless communication data, the communication cost, particularly the reception cost can be suppressed.

  In the mobile communication terminal of the present invention, the digital broadcast receiving unit includes a buffer for storing digital broadcast data before viewing and reproduction, and the complementing means complements the digital broadcast data stored in the buffer, and the viewing The reproduction means views and reproduces the digital broadcast data output from the buffer.

  In this configuration, the digital broadcast data is stored in the buffer and complemented while a data string having a bit error exists in the buffer, thereby making it possible for the viewer to notice that the reception state of the digital broadcast has deteriorated. No digital broadcast can be viewed and played continuously. By storing in the buffer, viewing and playback of the digital broadcast is completely eliminated in real time, but by setting the time to be stored in the buffer to the minimum necessary, the user can watch the digital broadcast in almost real time without making the user feel stressed. Can play.

  When receiving packet-type digital broadcasting, some packets are stored in the buffer, and when an error packet occurs, the packet is acquired as wireless communication data while the error packet is stored in the buffer. Error correction is performed by replacing it with an error packet.

  In the portable communication terminal of the present invention, the data sequence acquisition means detects an identifier for identifying a data sequence of digital broadcast data, and transmits the identifier as wireless communication data in the wireless communication unit. And means for receiving the data string of the digital broadcast data as wireless communication data by the wireless communication unit.

  In this configuration, by detecting an identifier for identifying a data string having a bit error and transmitting only the identifier as wireless communication data, it is possible to particularly suppress the transmission cost among the communication costs of wireless communication.

  When receiving a packet-type digital broadcast, the packet ID added to the packet header is used as the identifier. That is, the transmission cost can be suppressed by detecting the packet ID of the error packet and transmitting only the packet ID as wireless communication data.

  The present invention is also a digital broadcast complementing device configured to be communicably connected to a base station configured to be able to transmit and receive wireless communication data to and from a mobile communication terminal, and stores the digital broadcast data A digital broadcast data storage; an identifier detection unit for detecting an identifier from wireless communication data transmitted from a mobile communication terminal; and a data string detection unit for detecting a data string of digital broadcast data corresponding to the identifier from the digital broadcast storage; A digital broadcast complementing device comprising: a data string transmission unit that transmits the detected data string to the mobile communication terminal.

  In this configuration, the digital broadcast complementing apparatus transmits a data string for performing viewing / playback of the digital broadcast upon receipt of the identifier. As described above, since only the identifier and the data string corresponding to the identifier are transmitted and received, the communication cost can be suppressed to the maximum.

  When packet-type digital broadcasting is targeted, when a packet ID is received as wireless communication data, a packet corresponding to the packet ID is transmitted as wireless communication data. Thereby, communication cost can be suppressed for transmission / reception of only the packet ID and the corresponding packet.

  Further, the present invention includes a mobile communication terminal configured to be able to transmit and receive wireless communication data to and from a base station, and a digital broadcast complementing device configured to be communicably connected to the base station, A digital broadcast supplement system configured to be able to receive digital broadcast data broadcast from a broadcasting station, wherein the mobile communication terminal decodes the digital broadcast data, and the decoded digital broadcast data Means for storing in a buffer for a predetermined time before viewing and reproduction; means for detecting an identifier for identifying a data string that has not been correctly decoded out of the decoded digital data; and Means for transmitting as communication data to a digital broadcast supplement device, wherein the digital broadcast supplement device is a wireless communication data transmitted from the portable communication terminal. Means for detecting the identifier; means for detecting a data string of digital broadcast data corresponding to the detected identifier from a digital broadcast data storage storing digital broadcast data; and detecting the detected data string in the portable communication terminal And means for detecting the data sequence of the digital broadcast data from the wireless communication data transmitted from the digital broadcast complementing device, and the data of the detected digital broadcast data. According to the present invention, there is provided a digital broadcast complementing system having means for complementing digital broadcast data stored in the buffer and means for viewing and reproducing the digital broadcast data output from the buffer.

  In the digital broadcast supplement system of the present invention, means for storing the information amount of the wireless communication data transmitted from the digital broadcast supplement apparatus to the portable communication terminal in association with the identification number of the portable communication terminal; Means for calculating a charge amount according to the information amount of the wireless communication data stored in association with the identification number of the communication terminal.

  In these configurations, viewing and playback of digital broadcasting by the mobile communication terminal can be performed continuously without interruption. Further, it is possible to suppress the communication cost of the wireless communication data to the maximum, and to calculate a charge amount appropriate for the information amount and the communication cost.

  According to the present invention, it is possible to perform viewing and playback of a digital broadcast by a mobile communication terminal in substantially real time without interruption. Further, it is possible to suppress the communication cost of the wireless communication data and obtain an appropriate charge amount for the information amount and the communication cost.

  A system including a mobile communication terminal and a digital broadcast supplement apparatus according to the first embodiment of the present invention will be described with reference to FIGS.

First, FIG. 1 shows an outline of wireless communication and digital broadcasting according to the present embodiment.
The present embodiment will be described based on an example of a mobile phone terminal with TV that receives a digital TV broadcast in which TV content data is encoded in a TS (Transport Stream) packet format determined by the MPEG2 standard.
Here, the mobile phone terminal (Mobile Station) MS performs wireless communication with a base station (Base Transfer Station) BTS in a cellular manner. In the cellular system, a base station BTS is installed for each cell obtained by dividing a wide area to be serviced into fine areas.

  A plurality of base stations BTS are connected to a base station controller BSC (Base Station Controller). As the mobile phone terminal MS moves, wireless communication is performed while cooperation (handover) is performed between a plurality of different base stations BTS. This base station controller BSC is connected to a public line network 1 such as a fixed telephone line network, a carrier line network of another carrier, an IP line network used for the Internet, etc. via an exchange (not shown).

  The broadcast station 2 encodes digital TV content data for the mobile phone terminal MS in a TS packet format determined by the MPEG2 standard, and broadcasts it on broadcast radio waves.

  The mobile phone terminal MS is a mobile phone terminal with TV, and receives broadcast waves of digital TV broadcast from the broadcast station 2 in addition to the above-described cellular radio communication. The TS packet is decoded from the received broadcast radio wave. However, in the present invention, when the radio wave condition is bad and the TS packet cannot be decoded correctly, the error packet is reacquired by wireless communication to obtain high-quality content. Play data.

  On the other hand, a digital broadcast supplement device 3 is connected to the base station BTS. The digital broadcast supplement device 3 receives a digital TV broadcast radio wave from the broadcast station 2 and decodes and stores the TS packet. The digital broadcast complementing apparatus 3 transmits a predetermined TS packet to the mobile phone terminal MS in accordance with a request signal from the mobile phone terminal MS. Further, the mobile terminal ID of the mobile phone terminal MS and the number of TS packets transmitted to the mobile phone terminal MS are accumulated and stored.

  As a result, in the present embodiment, the digital TV broadcast viewing / playback on the mobile phone terminal MS can be performed continuously without interruption, and the communication cost of wireless communication data using the mobile phone line network can be reduced. An appropriate billing amount can be obtained for the information amount and the communication cost.

Next, the configuration of the digital broadcast supplement apparatus 3 will be described based on the block diagram shown in FIG.
The digital broadcast complementing device 3 includes a processing unit 10 composed of a CPU and ROM (not shown) that controls the overall operation of the device 3, a storage 12 that stores application programs, and the like, and receives broadcast radio waves and receives TS packets Is provided with a digital broadcast decoding unit 17 for decoding the data. A predetermined number of TS packets decoded by the digital broadcast decoding unit 17 are stored in the storage 12 as necessary. The digital broadcast complementing apparatus 3 includes a RAM 11 that loads each program stored in the storage 12. The RAM 11 is a volatile memory that temporarily stores data. Further, it is connected to another device in the base station BTS via a communication control interface (IF) 16. The input / output control interface (IF) 13 is connected to an input device 14 such as a mouse and a keyboard, an output device 15 such as a printer and a monitor, and a storage media recording / reproducing device (not shown).

  With such a configuration, the processing unit 10 loads various application programs stored in the storage 12 onto the RAM 11 and executes processing.

  Specifically, the process of storing the digital broadcast data decoded by the digital broadcast decoding unit 17 in the storage 12 for each TS packet, the process of acquiring the packet ID from the request signal received via the communication control IF 16, the packet Processing for searching for a TS packet stored in the storage 12 using the ID, generating a response signal by associating the searched TS packet with the mobile terminal ID of the mobile phone terminal MS that has transmitted the request signal, and communicating A process of transmitting to the base station BTS via the control IF 16 and a process of storing the number of TS packets transmitted to the mobile phone terminal MS and the mobile terminal ID in the storage are performed.

  Next, a part of the configuration of the TV-equipped mobile phone terminal MS according to the present embodiment will be described based on the block diagram shown in FIG.

The TV-equipped mobile phone terminal MS includes a digital TV broadcast receiving unit 100 and a wireless communication unit 200.
The digital TV broadcast receiver 100 includes a TV antenna 101, a digital TV receiver 102, a digital TV demodulator 103, a shift register 104, an MPEG decoder 105, and a TS packet request unit 106.
The wireless communication unit 200 includes a telephone antenna 201, a duplexer 202, a transmission circuit 203, an audio modulation circuit 204, a microphone 205, a reception circuit 206, a processor 207, an audio demodulation circuit 208, and a speaker 209.
Here, the processor 207 is illustrated as being provided in the wireless communication unit 200, but the processor 207 is a processor such as an MPU that performs control processing for the entire mobile phone terminal MS including the digital TV broadcast receiving unit 100. In this case, the processor 207 may perform not only processing related to wireless communication but also processing related to digital TV broadcasting.

  In normal mobile communication, when the user terminal starts a call, when the user performs a call operation by operating an operation unit (not shown), the processor 207 displays the call start request information based on the telephone number information of the other party. It is generated and converted into digital data, and is modulated into a modulation signal for wireless communication by the transmission circuit 203. The modulation signal for wireless communication carrying the call start request information is transmitted from the telephone antenna 201 via the duplexer 202.

  On the other hand, when the own terminal receives a transmission signal of call start request information from another terminal, the reception circuit 206 demodulates the modulated signal of the wireless communication carrying the transmission signal, and the processor 207 analyzes the transmission signal. The other party telephone number is displayed on the liquid crystal display unit (not shown). When the user performs an operation for permitting the start of a call on the operation unit, the processor 207 generates a response signal, converts the response signal into digital data, and outputs the digital data to the transmission circuit 203. The transmission circuit 203 modulates the digital data based on this response signal into a modulation signal for wireless communication, and transmits it from the telephone antenna 201 via the duplexer 202.

  In the case of call processing, the microphone 205 receives the user's utterance, digitally converts it by the voice modulation circuit 204, and outputs it to the transmission circuit. The transmission circuit modulates the digitally converted audio signal into a modulated signal for wireless communication, and outputs the modulated signal from the telephone antenna 201 via the duplexer 202. Also, when a radio communication modulation signal carrying a voice signal from the other party is received by the telephone antenna 201, the signal is input to the reception circuit 206 via the duplexer 202, and the response signal is demodulated by the reception circuit 206. The demodulated response signal is reproduced by the audio demodulation circuit 208 and output to the speaker 209.

  When viewing a TV program, when the TV antenna 101 receives a broadcast wave of a digital TV broadcast, the TV TV receiving unit 102 outputs a baseband signal obtained by converting the broadcast wave. Here, the digital TV receiver 102 is configured with a direct conversion RF circuit, and the baseband signal is divided into two channels of an I signal (In-phase signal) and a Q signal (Quadrature-phase signal). Output.

  The baseband signal is output from the digital TV receiving unit 102 to the digital TV demodulating unit 103. The digital TV demodulator 103 decodes and decodes an error correction code (FEC) to convert the baseband signal into an MPEG format TS packet.

  The converted TS packet is output from the digital TV demodulator 103 to the shift register 104. The shift register 104 is a device composed of a large number of flip-flops that delay digital data by a predetermined number of bits, and stores TS packets bit by bit in order for a predetermined time. The shift register 104 serves as a buffer for storing digital broadcast data. The detailed operation will be described later.

  When there is almost no error in the TS packet demodulated by the digital TV demodulator (when it is not an error packet), the TS packet stored in the shift register 104 is output to the MPEG decoder 105 as it is. The MPEG decoder 105 decodes the content data from the TS packet, reproduces the video signal and the audio signal, and outputs them to a liquid crystal display unit (not shown). The liquid crystal display unit displays video on the display screen and outputs sound from a speaker (not shown).

  If the TS packet cannot be correctly decoded, the TS packet request unit 106 detects the occurrence of the error packet and acquires the packet ID of the error packet. When the packet ID of the error packet itself cannot be decoded, the packet ID of the error packet is identified from the packet IDs of the preceding and succeeding TS packets and output to the TS packet request unit 106. The TS packet request unit 106 converts the packet ID into a TS packet request signal together with its own terminal identification code (mobile terminal ID), and outputs the request signal to the transmission circuit 203 of the wireless communication unit 200. Note that the function of the TS packet request unit 106 may be realized by the processor 207.

  In the wireless communication unit 200, the request signal for the TS packet is modulated by the transmission circuit 203 and output from the telephone antenna 201 via the duplexer 202.

  The request signal output from the telephone antenna 201 is input to the digital broadcast supplement device 3 via the base station BTS. The digital broadcast complementing apparatus 3 searches the storage 12 for a TS packet corresponding to the packet ID detected from the request signal. The retrieved TS packet is transmitted to the mobile phone terminal MS in accordance with the mobile terminal ID included in the request signal. The process for detecting the mobile terminal ID is performed by the base station BTS. The digital broadcast complementing apparatus 3 may be configured not to input the mobile terminal ID. In this case, the base station BTS stores the mobile terminal ID and the packet communication amount in order to calculate the charge amount. Good.

  The mobile phone terminal MS receives a modulation signal for wireless communication carrying a TS packet transmitted from the digital broadcast complementing apparatus 3 via the base station BTS. The receiving circuit 206 demodulates the TS packet from the received radio communication modulation signal. The processor 207 identifies the TS packet and outputs the identified TS packet to the digital TV broadcast receiving unit 100 instead of the audio demodulation circuit 208. In the digital TV broadcast receiving unit 100, the TS packet input from the processor 207 is replaced with an error packet stored in the shift register 104. As a result, only TS packets having no bit error are output from the shift register 104 to the MPEG decoder 105. The MPEG decoder 105 decodes the video digital data from the TS packet having no bit error, reproduces the video signal and the audio signal, and outputs them to a liquid crystal display unit (not shown). The liquid crystal display unit displays the input video signal on a display screen and outputs sound from a speaker (not shown).

  Thereby, viewing / playback can be performed continuously without interruption, and since the mobile phone terminal receives only the error packet, the reception cost of wireless communication can be suppressed. Further, since only the packet ID is transmitted, the transmission cost can be suppressed.

  Next, the operation of the shift register 104 will be described with reference to FIG.

  In FIG. 4, to simplify the explanation, the shift register 104 is displayed with a smaller number of bits to be stored. For convenience of illustration, the TS packet sequence length will be described as 6 bits. However, in actuality, ISDB-T standard and DVB-T standard TS packets have a sequence length of 188 bytes or 204 bytes. It is preferable that the number of bits of the shift register 104 is several times the sequence length of the packet, that is, several hundreds to tens of thousands of bits, and the shift register 104 always stores several packets to several hundreds of packets.

  The shift register 104 is a device that stores digital data by a predetermined number of bits. The TS register serially input bit by bit from the digital TV demodulator 103 is stored bit by bit in the cycle of the clock signal and sent from the end. It is going. Here, the Clock signal synchronizes the digital TV demodulator 103 and the processor 207. Although the clock signal is input from the digital TV demodulator 103 to the shift register 104, it may be configured to be input from another circuit.

  The shift register 104 outputs a TS packet bit by bit with a delay of a predetermined time depending on the number of bits stored therein and the frequency of the Clock signal. Here, if the number of bits stored in the shift register 104 is M [bit] and the frequency of the Clock signal is f [Hz], the TS packet is delayed by the time of M / f [s]. This delay time (M / f [s]) may be set based on the time required to obtain the TS packet using the above-described wireless communication.

  When the processor 207 replaces the error packet stored in the shift register 104 with the obtained TS packet, the processor 207 sets the load enable terminal to enable, and among the plurality of rewrite terminals connected in parallel, the bit at the position of the error packet A rewrite signal is given to the rewrite terminal corresponding to. The position and timing of the terminal to which the rewrite signal is applied may be grasped by using the processor 207, another integrated circuit, a counter, or the like.

  As described above, the TS packet is stored in the shift register 104, and in order to complement the TS packet while being stored in the shift register 104, the reception status of the digital broadcast is deteriorated for the viewer. Digital broadcasts can be played continuously without being noticed and without requiring any operation from the viewer.

  Next, setting of the delay time of the TS packet by the shift register 104 will be described.

  The delay time of the TS packet by the shift register 104 is preferably set to a time necessary for obtaining the TS packet as wireless communication data, but the time is determined by the base station BTS and the mobile phone terminal MS for wireless communication. Is substantially equal to the total time of the time required for wireless communication with the mobile station, the time required for communication between the base station BTS and the digital broadcast complementing device 3, and the internal processing time of the digital broadcast supplementing device 3.

  When the digital broadcast supplement apparatus 3 is directly connected to the base station BTS as in the present embodiment, the time required for communication between the base station BTS and the digital broadcast supplement apparatus 3 can be almost ignored.

  Also, the digital broadcast complementing device 3 deletes TS packets stored for a predetermined time from the TS packets stored in the storage, and stores only a few packets to several hundred packets that can be stored in the shift register of the mobile phone terminal MS. In this case, the time required for searching for TS packets can be reduced. In this case, the internal processing time of the digital broadcast supplement device 3 can be almost ignored. The process of deleting the TS packet can be realized as an application program by the processing unit.

  In addition, the time required for wireless communication between the base station BTS and the mobile phone terminal MS is a maximum of X if the maximum round-trip distance in the cell between the base station and the mobile phone terminal is X [m]. / C [s]. Here, C is the speed of light (C [m / s]).

  Therefore, when the time required for communication between the base station BTS and the digital broadcast supplement device 3 and the internal processing time of the digital broadcast supplement device 3 are reduced, the communication between the base station BTS and the mobile phone terminal MS is performed. The delay time of the TS packet by the shift register 104 has only to be set for the time required for the wireless communication, and therefore, the period of the aforementioned Clock signal is set to f [Hz] and the bit length of the shift register is set to M [bit]. The delay time (M / f [s]) of the shift register 104 is set to be the maximum time (X / C [s]) required for radio communication between the base station BTS and the mobile phone terminal MS. Is preferable.

  As described above, in the present embodiment, storage in the digital broadcast supplement device 3 is performed by receiving broadcast radio waves. The present invention is not limited to this embodiment, and can be implemented even in a configuration in which the broadcasting station 2 and the digital broadcast complementing apparatus 3 perform wired communication using an optical cable or the like. If the broadcast station operator and the wireless communication operator are the same, the digital TV content data is matched between the broadcast station 2 and the digital broadcast supplement device 3 using a storage medium. It is also possible. In this case, communication is not necessarily required between the broadcast station 2 and the digital broadcast supplement device 3.

  In the present embodiment, the digital broadcast supplement device 3 is connected to the base station BTS. However, the digital broadcast supplement device 3 is not necessarily connected to the base station BTS, and is connected to the base station control device BSC. It may be done. As a result, it is not necessary to connect the digital broadcast supplement apparatus 3 to all the cellular base stations BTS, and the total number of digital broadcast supplement apparatuses 3 to be installed can be reduced. In this case, the delay time by the shift register 104 of the mobile phone terminal MS may be the maximum time including the communication time between the base station controller BSC and the base station BTS.

  Further, the digital broadcast supplement device 3 may be connected to the base station control device BSC via the public line network 1. Furthermore, it is preferable to connect the digital broadcast complementing device 3 via the IP line network, whereby a general IP multicast server device can be used as the digital broadcast supplementing device 3. In this case, a time obtained by adding the time required for the base station BTS to communicate with the base station controller BSC via the public network 1 to the delay time before reproducing the TS packet of the mobile phone terminal MS, However, in that case, it is preferable to use a large-capacity storage such as a magnetic storage device instead of the shift register 104. Even in the case of using a magnetic storage device, sequential transmission of bit strings of TS packets, rewriting of bits, and the like can be realized by processing using the processor 207 or a separately provided logic circuit or MPU.

  Next, a mobile phone terminal MS according to another embodiment will be described. FIG. 5 is a diagram for explaining the operation of the shift register 304 of the mobile phone terminal MS.

  In FIG. 5, the shift register 304 is displayed with a smaller number of bits to be stored in order to simplify the explanation as in FIG. 4. Also, the sequence length of the TS packet will be described as 6 bits.

  The period of the Clock signal from the digital TV demodulator 303 is output to the processor 307 together with the shift register. Here, the Clock signal is synchronized between the processor 307 and the digital TV demodulator 303, and is input from the digital TV demodulator 303 to the shift register 304. However, the Clock signal is input from another circuit. It may be configured.

  If the TS packet is not decoded correctly, the TS packet is obtained by wireless communication, and the processor 307 replaces the obtained TS packet with an error packet stored in the shift register 304. Specifically, the processor 307 temporarily stores the obtained TS packet in a latch or memory, and gives a rewrite signal to a rewrite terminal connected so as to correspond to the last bit of the shift register 304. At the same time, the Load Enable terminal is set to Enable. The timing for giving this rewrite signal is the timing for each bit at which each bit of the error packet is located at this end bit. Even in this case, replacement of TS packets using the shift register 304 can be performed, and only TS packets having no bit error can be output to the MPEG decoder 305. By rewriting the bit at the end of the shift register 304, the delay time by the shift register 304 becomes proportional to the number of bits. Note that the processing performed by the processor 307 may be performed by a logic circuit or MPU. It can be implemented regardless of the configuration.

  As described above, the TS packet is stored in the shift register 304, and in order to supplement the TS packet while being stored in the shift register 304, the reception state of the digital broadcast is deteriorated for the viewer. Digital broadcasts can be played continuously without being noticed and without requiring any operation from the viewer.

  The present invention is not limited to the MPEG2 standard digital TV broadcast shown in each of the above embodiments, but other MPEG4 standards related to contents, ISDB standards and DVB standards related to digital broadcasts, and other contents (such as radio). The present invention can be implemented even with various digital broadcasts, and any packet broadcast digital broadcast is preferable. Further, the present invention is not limited to the mobile phone terminal shown in the above embodiments, and any terminal that performs wireless communication via a base station is suitable.

It is a block diagram which shows the digital broadcast complementation system which concerns on 1st Embodiment. It is a block diagram which shows the digital broadcast complementation apparatus which concerns on 1st Embodiment. It is a block diagram which shows the mobile telephone terminal with TV which concerns on 1st Embodiment. It is a figure which shows operation | movement of the shift register which concerns on 1st Embodiment. It is a figure which shows operation | movement of the shift register which concerns on other embodiment.

Explanation of symbols

1- public line network 2-broadcasting station 3-digital broadcast complementing apparatus 10-processing unit 11-RAM
12-Storage 14-Input device 15-Output device 17-Digital broadcast decoding unit 100-Digital TV broadcasting unit 101-TV antenna 102-Digital TV receiving unit 103, 303-Digital TV demodulating unit 104, 304-Shift register 105, 305-MPEG decoder 106-TS packet request unit 200-Radio communication unit 201-Telephone antenna 202-Duplexer 203-Transmission circuit 204-Audio modulation circuit 205-Microphone 206-Reception circuit 207, 307-Processor 208-Audio demodulation circuit 208 -Voice demodulation circuit 209-speaker BSC-base station controller BTS-base station MS-mobile phone terminal

Claims (6)

In a mobile communication terminal comprising a digital broadcast receiving unit that receives digital broadcast data broadcast from a broadcast station, and a wireless communication unit that transmits and receives wireless communication data to and from a base station,
A data string acquisition unit that requests and acquires a data string of digital broadcast data that cannot be correctly decoded by the digital broadcast receiving unit, and a complementing unit that complements the digital broadcast data with the acquired data string; And a viewing / reproducing means for viewing / reproducing the complemented digital broadcast data. The digital broadcast receiving unit includes a buffer for storing digital broadcast data before viewing and reproduction,
2. The portable communication terminal according to claim 1, wherein the complementing unit supplements digital broadcast data stored in the buffer, and the viewing / playing unit views and plays back the digital broadcast data output from the buffer.   The data string acquisition means detects an identifier for identifying a data string of digital broadcast data, means for transmitting the identifier as wireless communication data in the wireless communication unit, and wirelessly transmits the data string of digital broadcast data. The mobile communication terminal according to claim 1, further comprising: a unit that receives the communication data at the wireless communication unit. A digital broadcast supplement device configured to be communicably connected to a base station configured to be able to transmit and receive wireless communication data with a mobile communication terminal,
Digital broadcast data storage that stores digital broadcast data, an identifier detection unit that detects an identifier from wireless communication data transmitted from a mobile communication terminal, and a data string of digital broadcast data corresponding to the identifier from the digital broadcast storage A digital broadcast complementing device comprising: a data string detection unit that performs the data string transmission unit that transmits the detected data string to the mobile communication terminal. Including a mobile communication terminal configured to be able to transmit and receive wireless communication data to and from a base station, and a digital broadcast supplement device configured to be communicably connected to the base station, each of which is broadcast from the broadcast station A digital broadcast supplement system configured to receive digital broadcast data,
The mobile communication terminal includes means for decoding digital broadcast data, means for storing the decoded digital broadcast data in a buffer for a predetermined time before viewing and reproducing, and the decoded digital data Means for detecting an identifier for identifying a data string that has not been correctly decoded, and means for transmitting the identifier as wireless communication data to a digital broadcast complementing device,
The digital broadcast complementing device has a means for detecting the identifier from wireless communication data transmitted from the mobile communication terminal, and a digital broadcast data data string corresponding to the detected identifier. Means for detecting from a broadcast data storage; and means for transmitting the detected data string to the portable communication terminal;
The portable communication terminal is further stored in the buffer by means for detecting a data string of the digital broadcast data from the wireless communication data transmitted from the digital broadcast complementing device, and the data string of the detected digital broadcast data. A digital broadcast complement system comprising: means for complementing digital broadcast data; and means for viewing and reproducing digital broadcast data output from the buffer. The digital broadcast supplement system according to claim 5,
Means for storing the information amount of the wireless communication data transmitted to the mobile communication terminal by the digital broadcast complementing device in association with the identification number of the mobile communication terminal;
Means for calculating a billing amount according to the amount of wireless communication data stored in association with the identification number of the mobile communication terminal.

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