JP4933594B2 - Television receiver, network system and control method thereof - Google Patents

Description

  The present invention relates to a television receiver, a network system, and a control method thereof. More specifically, in cooperation with a mobile terminal, the content that can be controlled by the television receiver in the home can be controlled and viewed even when away from home. In a simple network system, even if various errors occur on a mobile terminal that receives and displays content while moving and viewing on the mobile terminal becomes difficult, the TV can be easily set up without any special operation. The present invention relates to a television receiver, a network system, and a control method thereof that can provide a user with a viewing environment that can be viewed again by the receiver.

JP 2002-77839 A

  Transmit and view digital broadcast waves on mobile terminals such as mobile phones and PDAs (Personal Digital Assistance) such as mobile terminals, broadcast contents received by TV receivers, or stored contents that can be controlled by TV receivers. Technology is expected. With these technologies, the user can enjoy viewing the content while being away from the living room at home.

  An example is terrestrial digital broadcasting. One of the characteristics of terrestrial digital broadcasting is that it employs OFDM (Orthogonal Frequency Division Multiplex), which makes it more resistant to multipath interference. Therefore, even if the interference condition of the radio wave changes from time to time due to movement, the image is hardly disturbed, and the radio wave can be received with a small antenna built in the apparatus without using a large antenna installed outdoors. Based on these technical features, a technique for viewing broadcast content on a mobile terminal is being established.

  In addition, there is a desire to receive the content once accumulated by the mobile terminal. Such an apparatus, method, and system are described in Patent Document 1. In the technique described in Patent Document 1, a recording request is transmitted from a portable terminal to a recorder with a TV broadcast reception function via a network, and the recorder that receives the request records the specified content. The recorder also transmits the recorded content to the mobile terminal via the network in accordance with an instruction from the mobile terminal. By using this technology, it becomes possible to view the stored content from the outside using a mobile terminal.

  A network system capable of controlling and viewing the content of a television receiver in the home on the go with a mobile terminal and such a television receiver are technologies that have great user needs and are highly expected.

  With this technology, the user can avoid the risk of missing the desired content due to unexpected sudden going out or forgetting to make a recording reservation. As a result, time can be utilized more effectively.

  However, there are some problems that are of concern when using such technology. For example, in a mobile terminal that is moving, an error often occurs depending on the reception state. When normal viewing becomes difficult due to such an error, the user may view the continuation of the content after returning home, but the operation at that time becomes complicated.

  In addition, a situation is assumed in which a user is moving while viewing a content that can be controlled by a television receiver using a mobile terminal. When the user uses a relatively high-speed moving means such as a train or a car, the reception environment of the mobile terminal changes every moment. Sometimes, it may enter an area where reception is poor, such as in a tunnel, or it may go out of the reception coverage area of the mobile terminal. In such a case, the mobile terminal cannot receive radio waves, and a reception error occurs, and it becomes impossible to present content to the user. In addition to such reception errors, various errors such as a communication error due to the communication load state of the line and a decoding error due to the processing capability of the mobile terminal can be considered. As a matter of course, the same is true even when moving at low speed such as walking.

  As described above, when an error occurs during viewing of content that can be controlled by the television receiver using a mobile terminal while away from home, viewing becomes difficult, the user may re-view the content after returning home. is expected. If the user has special feelings about the content, it may be possible to re-view it from the beginning, but it is usually used by skipping the part that has already been viewed and re-viewing it when viewing becomes difficult It is thought to do.

  Depending on how the error occurs in the mobile terminal, there may be a viewing method in which if there are places where viewing is difficult in some places, only those places should be confirmed after returning home.

  In such various situations, after returning home, the user sets the television receiver to a viewable state in order to re-view the content, displays the content on the television receiver, and if the playback position of the content is desired. If the playback position is different from the above, it is possible to view from a desired position only by adjusting the playback position by fast forward / rewind or an operation corresponding thereto. In this way, the user is forced to perform the above-described plurality of operations at once immediately after returning home. Furthermore, when there are a plurality of reproduction positions desired to be viewed, it is possible to view all the desired places only after repeating the above operation many times.

  Consumer products such as television are considered to be used by a wider user group, unlike personal computers and the like. Some users may not be familiar with the detailed operation of the device. It is very difficult for such a user to enjoy and perform the operations described above. Even if it is technically excellent and has high expectations from the user, it will not spread unless it is supported by the user from the viewpoint of the user interface.

  Thus, when viewing the continuation of the content that was viewed by the mobile terminal on the go with the television receiver, good operability is desired from the viewpoint of the user interface.

  It is an object of the present invention to provide a television receiver, a network system, and a control method thereof that make it possible to easily view desired content.

A television receiver according to the present invention is a television receiver capable of communicating with a mobile terminal device connected via a network, and a playback control means for controlling playback of moving image data recorded on a recording medium ; Communication means for transmitting the moving picture data reproduced by the reproduction control means to the portable terminal device via the network, detection means for detecting occurrence of a communication error in the network, and during transmission of the moving picture data Storage means for storing, in a storage unit, reproduction position information indicating a reproduction position of the moving image data when the communication error has occurred when the detection means detects the occurrence of the communication error, reproduction control means, the reproduction position indicated by the playback position information stored in the storage unit, again to reproduce the moving image data recorded on the recording medium Doo is characterized in that it is possible.

The network system according to the present invention is a network system capable of communicating between a television receiver connected via a network and a portable terminal device, wherein the portable terminal device is connected to the television receiver via the network. A decoder for decoding the video data received from, and a notification means for detecting the occurrence of a decoding error of the decoder and notifying the television receiver of the occurrence of the decoding error via the network, A television receiver for reproducing and controlling moving image data recorded on a recording medium; and communication means for transmitting the moving image data reproduced by the reproduction controlling unit to the portable terminal device via the network. During the transmission of the video data, the notification means notifies the occurrence of the decoding error. Storage means for storing reproduction position information indicating a reproduction position of the moving image data when the decoding error occurs in a storage unit, and the reproduction control unit stores the reproduction control unit stored in the storage unit The moving image data recorded on the recording medium can be reproduced again from the reproduction position indicated by the reproduction position information.

A method for controlling a television receiver according to the present invention is a method for controlling a television receiver capable of communicating with a mobile terminal device connected via a network, and controls reproduction of moving image data recorded on a recording medium. A reproduction control step, a transmission step of transmitting the reproduced moving image data to the portable terminal device via the network, a detection step of detecting occurrence of a communication error in the network, and the transmission of the moving image data A storage step of storing, in a storage unit, reproduction position information indicating a reproduction position of the moving image data when the communication error occurs when the occurrence of the communication error is detected in the detection step; from the reproduction position indicated by the playback position information stored in the storage unit, it is possible to reproduce the moving image data recorded on the recording medium again Characterized in that it is a capability.

A method for controlling a television receiver according to the present invention is a method for controlling a network system capable of communicating between a television receiver connected via a network and a mobile terminal device, and the television receiver is a recording medium. A reproduction control step for controlling reproduction of the recorded moving image data, a transmission step for transmitting the reproduced moving image data from the television receiver to the portable terminal device via the network, and the portable terminal device comprising: Decoding step for decoding moving image data received from the television receiver via a network, detection of occurrence of a decoding error, and notification of the occurrence of the decoding error from the portable terminal device to the television receiver via the network A notification step, and the television receiving device A storage step of storing, in a storage unit, reproduction position information indicating a reproduction position of the moving image data when the decoding error has occurred when the occurrence of the decoding error is notified, and stored in the storage unit The moving image data recorded on the recording medium can be reproduced again from the reproduction position indicated by the reproduction position information.

  According to the present invention, even when an error occurs on a mobile terminal that receives and displays content while moving and viewing on the mobile terminal becomes difficult, the TV receiver can easily perform the operation without any special operation. It is possible to provide the user with a viewing environment in which desired content can be viewed, and to avoid troublesome operations for the user.

  In the re-viewing of content that is expected to be very complicated, a comfortable viewing environment can be realized by providing an optimal user interface and system.

  Even when various errors occur on the mobile terminal that receives and displays content while moving and viewing on the mobile terminal becomes difficult, the scenes that are lost by the TV receiver can be easily deleted without any special operation. It is possible to provide the user with a viewing environment in which re-viewing can be performed.

  When the mobile terminal receiving or displaying the content of the TV receiver device while moving causes a part that cannot be viewed or difficult to view on the mobile terminal, the user can return to the TV after returning home. When re-viewing with the receiving device, it is possible to avoid a troublesome operation such as searching after finding a desired portion, and to provide the user with a viewing environment in which desired content can be viewed without any special setting.

1 is a block diagram of a schematic configuration of a television receiver according to a first embodiment of the present invention. The schematic block diagram of D-VHS. Figure showing the appearance of a mobile phone 1 is a schematic configuration block diagram of a mobile phone. The figure which shows the example of 1 structure of a network system. The figure which shows the control flow of the data communication between a mobile telephone, a television receiver, and D-VHS. The figure which shows an example of the content list displayed on the screen of a mobile telephone. Operation | movement explanatory drawing of a television receiver. Operation | movement explanatory drawing of a portable terminal. The figure which shows the format of a TCP header. The figure which shows the role of each bit of the reservation area | region of a TCP header. The figure which shows an example of the message which a television receiver displays. The schematic block diagram of the television receiver in 2nd Example. The figure which shows an example of the message which a television receiver displays. The schematic block diagram of the television receiver in 3rd Example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a digital television receiver 100 according to an embodiment of the present invention.

  A signal received by an antenna (not shown) is input to the tuner unit 101. The tuner unit 101 performs processing such as demodulation and error correction on the input signal, and generates digital data in a format called a transport stream. The generated transport stream (TS) data is input to the descrambler 102.

  When descrambler 102 receives scrambled TS data for viewing restriction from tuner unit 101, descrambler 102 outputs descramble key information included in TS data and IC card control unit 117. Based on the key information, descrambling is canceled, and the descrambled TS data is output to the demultiplexer 103.

  The IC card unit 117 includes an IC card in which key information for solving key information for descrambler included in the user contract information and TS data is stored, and for descrambling input from the descrambler 102 If there is key information for solving the key information, the key information is output to the descrambler 102.

  In addition, when descrambled TS data is input from the tuner unit 101, the descrambler 102 outputs the TS data to the demultiplexer 103 as it is. The output data of the descrambler 102 is TS data in which video / audio data for a plurality of channels, electronic program guide (EPG) data, data broadcast data, and the like are time-division multiplexed.

The demultiplexer 103 extracts the video data D1 and audio data D2 of the channel selected by the operation of the operation unit 114 or the remote controller 116 from the TS data input from the descrambler 102, and outputs the video data D1 to the video decoder 104. The audio data D2 is output to the audio decoder 105. Further, the demultiplexer 103 extracts the data broadcast / EPG data D3 from the TS data and outputs it to the data stream processing unit 106. The data broadcast / EPG data processed by the data stream processing unit 106 is taken into the memory 107 via the bus 120, and stored in a recording medium (not shown) after software processing by the CPU 118 .

  TS data is transmitted in units of packets. A PID (Packet IDentification) is added to the head of the packet. The demultiplexer 103 reads the PID to identify the video data D1, the audio data D2, and the data broadcast / EPG data D3.

  The video data processing will be described. The video decoder 104 performs MPEG2 decoding processing on the video data D1 output from the demultiplexer 103, and outputs the decoded video data to the display control unit 109. The display control unit 109 switches or multiplexes the image data from the video decoder 104 and the screen configuration unit 108 according to the operation of the remote controller 116 and causes the image display unit 112 to display the image data. When a plurality of image data / audio data / data broadcast / EPG data is received, the images are combined and output to the image display unit 112. The screen display unit 112 includes a monitor (not shown) and a video signal input terminal.

  Next, audio data processing will be described. The audio decoder 105 performs MPEG2 decoding processing on the audio data D2 output from the demultiplexer 103, and applies the decoded audio data to the digital / analog converter (DAC) 110. The DAC 110 converts the audio data output from the audio decoder 105 into an analog signal and applies the analog signal to the audio output unit 113. The audio output unit 113 includes a speaker (not shown) and an audio signal input terminal.

  Processing of data broadcasting / EPG data D3 will be described. Electronic program guide (EPG) data is transmitted in a data structure defined by the standard “program display information used for digital broadcasting” and the like in the Japan Radio Industry Association (commonly known as “ARiB”). As main configuration data, SDT (Service Description Table) that transmits information about the organization channel, such as the name of the organization channel and the name of the broadcaster, the name of the bouquet (set of organization channels), and the organization channel included, etc. BAT (Bouquet Association Table) that transmits information about the bouquet, EIT (Event Information Table) that transmits information about the program such as the program name, broadcast start date and time, and description of the contents, and information on the current date and time There is a TDT (Time Data Table) to be transmitted.

  The data broadcast / EPG data D3 includes data such as SDT, EIT, and TDT. First, the data stream processing unit 106 reads the TDT, acquires the current time information, and outputs the current time information to the CPU 118. The CPU 118 determines an EPG display time zone corresponding to the current time, and outputs appropriate time zone information to the data stream processing unit 106.

  Next, the data stream processing unit 106 reads the SDT from the memory 107 based on the time zone information from the CPU 118, confirms the presence / absence of the program table, and acquires information such as the channel name and channel number of its own and other streams. . The data stream processing unit 106 further reads the EIT from the memory 107, and acquires information such as the program name, its start time, category, and program description in each channel of its own and other streams. The data stream processing unit 106 performs a decoding process on the data broadcast / EPG data D3 read from the memory 107, and outputs the decoded EPG data to the screen configuration unit 108.

  The screen configuration unit 108 outputs a character signal for configuring the EPG screen to the display control unit 109 based on the EPG data from the data stream processing unit 106.

  The display control unit 109 switches between the video related to the video data output from the video decoder 104 and the EPG screen related to the character signal output from the screen configuration unit 108 according to the operation of the operation unit 114 and the remote control 116. In this manner, a video signal is output to the image display unit 112. The display control unit 109 outputs the EPG screen of the character signal output from the screen configuration unit 108 to the video display unit 112 when the operation unit 114 and the remote control 116 are instructed to display the EPG screen.

  In data broadcasting, digital data is repeatedly transmitted from a broadcasting station according to the DSM-CC data carousel system defined in ISO / IEC13818-6. The data broadcast data filtered by the demultiplexer 103 includes text information, script information, image information, and video / audio data, and the text information is described in XML (extensible Markup Language) defined by W3C.

  The data stream processing unit 106 decodes EPG data composed of text information and image information and data broadcast data composed of text information, image information and video / audio data from the data broadcast / EPG data D3. Stored in the memory 107 via the bus 120.

  The light receiving unit 115 receives user operation information from the remote control 116 as an infrared signal, and transmits the infrared signal to the CPU 118 via the bus 120.

  The CPU 118 controls the television receiver 100 in an integrated manner according to various information.

  Further, an IEEE 1394 interface 121, an encoder 122, a communication control unit 123, and a reproduction position storage unit 124 are connected to the bus 120. The IEEE 1394 interface 121 is used to connect an external D-VHS 130, a printer 131, and the like to the television receiver 100. The encoder 122 is used to convert the stored content data from the D-VHS 130 and a storage medium (not shown) into a data format suitable for reception and playback of the mobile terminal. The communication control unit 123 is connected to the Internet and can communicate with the mobile terminal using TCP / IP. The playback position storage unit 124 stores the sequence number of the TCP / IP header and the time stamp of the content as the playback start position of the content sent from the communication control unit 123. Details of the reproduction position storage unit 124 will be described later.

  The D-VHS 130 will be described with reference to FIG. The IEEE 1394 interface 201 is connected to another IEEE 1394 interface, in this embodiment, the IEEE 1394 interface 121 of the television receiver 100. The D-VHS main unit 202 records video / audio data on a recording medium and reproduces the recorded video / audio data (video data) on the recording medium. The encoder / decoder 203 converts the data format in order to transmit / receive video data to / from the television receiver 100. The control unit 204 controls the D-VHS main unit 202 and the encoder / decoder 203 in an integrated manner.

  When receiving a control request for the D-VHS 130 from the user via the remote controller 116 and a portable terminal described later, the television receiver 100 controls the D-VHS 130 using a communication protocol based on an IEEE 1394 AVC command. Assume that the stored content described here is stored in the D-VHS 130.

FIG. 3 shows the appearance of a mobile phone (mobile terminal device) , and FIG. 4 shows a schematic block diagram of the mobile terminal.

An antenna 301 for transmission / reception is attached to the mobile phone 300 so that it can be pulled out and accommodated. Voice of the other party is output from the speaker 302. A display 303 displays various information such as a radio wave state and a stored phone book, and also displays content data from the television receiver 100. The operation input unit 304 for various operations includes a numeric keypad. The microphone 305 collects the user's voice during a call. The mobile phone main body 307 provides functions of a general mobile phone including the antenna 301 and the microphone 305. The communication control unit 308 has a function of connecting to the Internet using a simple transport protocol via a server provided in the public line network. The decoder 309 decodes the content data received by the communication control unit 308 and outputs it to the display unit 303. Buffer 310 is prepared to perform the window control a simple transport protocol.

  FIG. 5 shows an example of a network system used in this embodiment. The mobile terminal 300 is wirelessly connected to the fixed radio base station 401 by, for example, W-CDMA (Wideband-Code Division Multiple Access). W-CDMA has a data transmission capability of 144 kbps when moving at high speed, 384 kbps when walking, and 2 Mbps when stationary, and enables real-time communication using moving images and sounds. The fixed radio base station 401 further serves as a gateway and serves as an interface between TCP and w-TCP (Wireless Profiled TCP), which will be described later.

  The fixed wireless base station 401 is connected to a public line network 402 by wire, and the public line network 402 is connected to the Internet 403 and many subscriber wired terminals and computer networks (not shown). A number of servers including a WWW server (not shown) are connected to the Internet 403, and the mobile terminal 300 and the television receiver 100 can communicate with these servers according to the TCP / IP protocol. The gateway 404 serves as an interface between the Internet 403 and the television receiver 100.

  The television receiver 100 controls the connected D-VHS 130 and sends the content to the mobile terminal 300 via the Internet 403. The TCP / IP protocol is used for everything from the television receiver 100 to the fixed radio base station 401 via the Internet 403, and the above-described w-TCP is used as a simple transport protocol from the fixed radio base station 401 to the portable terminal 300. used.

  A brief description of w-TCP will be given. Conventionally, UDP / IP having a smaller communication sequence than TCP / IP has been used for wireless communication with narrow traffic. However, UDP / IP cannot receive large data. Therefore, w-TCP is obtained by tuning some parameter settings existing in TCP / IP for wireless communication. Rather than creating a new protocol, it can be considered that a default value suitable for radio is given to TCP / IP. In this embodiment, TCP / IP is partially expanded and used. For example, a part of the reserved area of the header is used for decoding error detection. Here, details regarding the extended specifications to be used will be described later.

In the network system shown in FIG. 5, a control signal can be transmitted from the mobile terminal 300 to the television receiving device 100 , and the television receiving device 100 can transmit moving image data that is stored content of the D-VHS 130 to the mobile terminal 300. Details of this operation will be described.

  FIG. 6 shows a data communication flow among the mobile phone 300, the television receiver 100, and the D-VHS 130.

  The mobile phone 300 transmits a command for requesting communication permission to the television receiving device 100 in order to perform communication with the television receiving device 100 using TCP / IP. Receiving this command, the television receiving device 100 determines whether or not to permit communication, and if OK, transmits a command requesting communication permission to the mobile phone 300 together with that fact. The mobile terminal 300 that has received this command sends a command indicating communication permission to the television receiving device 100 lastly, thereby establishing a TCP connection and securing a communication path (500).

  When the establishment of the communication path is completed, the portable terminal 300 requests a controllable content list described in HTML of the television receiver 100 by HTTP (501). The content that can be controlled by the television receiver 100 is, for example, content of a device connected by IEEE 1394, content stored in a built-in HDD, or the like, and in this embodiment, is content of the D-VHS 130. Receiving the request, the television receiver 100 creates a list of controllable contents according to HTML, and transmits the list to the portable terminal 300 using HTTP (502). FIG. 7 shows an example of a content list received and displayed by the mobile phone 300.

  The user operates the GUI displayed on the display unit 303 of the mobile phone 300 using the operation input unit 304 and selects content desired to be viewed. When any content is selected by the user, the mobile phone 300 transmits a transmission request for the selected content to the television receiver 100 (503).

Receiving the content transmission request, the television receiving device 100 acquires content from a device that stores the specified content. That is, when it is recognized that the designated content is stored in the D-VHS 130, an IEEE 1394 AV / C command for content acquisition is transmitted to the D-VHS 130 (504). The D-VHS 130 that received the AV / C command reproduces the content and transmits it to the television receiver 100 via the IEEE 1394 (505).

  The television receiver 100 sequentially receives the data from the D-VHS 130 and converts the data into a format suitable for reception / reproduction by the mobile phone 300 by the encoder 122 (506). After the format conversion, the television receiver 100 stores a sequence number used for transmission by TCP / IP and a time stamp indicating content position information in the reproduction position storage unit 124 (507). Here, the time stamp represents a common content playback position before and after format conversion. With this information, the television receiver 100 can uniquely identify the position of the content where the transmission error or the decoding error has occurred. After recording the playback position, the television receiver 100 starts transmitting content to the mobile phone 300 by TCP / IP (508).

  The mobile phone 300 that has received the content analyzes the TCP / IP header received by the communication control unit 308 and sequentially stores it in the buffer 310. The decoder 309 sequentially extracts and decodes the stored content data from the buffer 310, and displays the decoded data on the display unit 303 (509). The mobile phone 300 returns a reception confirmation notification including information on the presence / absence of an error to the television receiver 100 (510).

  Through the above procedure, the user can view desired content on the mobile phone 300.

  When all the content reproduction ends or communication is disconnected due to deterioration of the communication status, the television receiver 100 transmits a command to the mobile phone 300 to end communication. Receiving this command, the mobile phone 300 returns a response indicating whether the termination is permitted and transmits a communication termination request to the television receiver 100. The television receiver 100 that has received this response returns a response indicating acceptance of disconnection. This completes the disconnection of the TCP connection (511).

  With reference to FIG. 8, the operation of the television receiver 100 related to communication with the mobile phone 300 from acquisition of stored content will be described in detail.

  As described above, when the television receiver 100 stores the controllable stored content (S700), the television receiver 100 converts the encoded content into a format suitable for viewing on the mobile phone 300 (S701).

  After the format conversion, the television receiver 100 transmits data to the mobile phone 300 by TCP / IP. At this time, the sequence number used in the TCP header is associated with the time stamp for identifying the reproduction position information of the content. Is stored in the reproduction position storage unit 124 (S702). The TCP header will be described later. The television receiver 100 transmits the content data from the communication control unit 123 to the mobile phone 300 using the sequence number (S703).

  In TCP, in order to realize highly reliable communication, there is a mechanism for detecting and retransmitting a TCP segment when it is lost in the middle. There are two possible cases where the TCP segment is lost along the way: a case where the transmitted TCP segment is not halfway, and a case where the confirmation response from the receiving side is lost along the way. These communication errors are detected mainly by the television receiver 100. When the television receiver 100 transmits the TCP segment, it expects an acknowledgment (ACK) corresponding to the TCP segment. When this confirmation response is not returned within a certain time, the television receiver 100 determines that the TCP segment is lost during the process. In normal TCP / IP, the TCP segment is transmitted again, but the television receiver 100 of this embodiment branches the process depending on whether or not there is a confirmation response (S704).

  When the confirmation response is not returned, the television receiver 100 starts transmission of the next segment while leaving the sequence number and the time stamp as information on the segment in the reproduction position storage unit 124. When the confirmation response is returned, the process branches depending on whether the mobile terminal 300 has successfully presented the content to the user (S705). When the content cannot be presented to the user due to a decoding error or the like, as in the case where the confirmation response is not returned, the television receiver 100 leaves a sequence number and a time stamp as information on the segment in the reproduction position storage unit 124. The transmission of the next segment is started. On the other hand, when the mobile terminal 300 has successfully played back the content, the television receiver 100 clears the information (sequence number and time stamp) related to the segment stored in the playback position storage unit 124, and the next segment Transmission is started (S706).

  By such a procedure, only the information on the reproduction position when there is a communication error or a decoding error is accumulated in the reproduction position storage unit 124 of the television receiver 100. When a communication error or a decoding error frequently occurs within a certain time, the television receiving device 100 determines that the communication state with the mobile phone 300 has deteriorated, and disconnects the TCP connection with the mobile phone 300.

  FIG. 9 shows a flow of the operation of the mobile phone 300 related to the transmission of the confirmation response from the reception of the content. With reference to FIG. 9, the operation from the reception of the content to the transmission of the confirmation response in mobile phone 300 will be described in detail.

  The portable terminal 300 receives the TCP segment transmitted from the television receiver 100 by the communication control unit 308 (S800). The cellular phone 300 buffers the received data in the buffer 310 by the window size notified when the TCP connection is established (S801). Thereafter, the decoder 309 sequentially starts decoding (S802). Here, the process branches depending on whether or not a decoding error has occurred (S803). If no decoding error has occurred, a confirmation response is returned in accordance with normal TCP / IP processing, and the flow proceeds to the next processing (S805). On the other hand, when a decoding error occurs and the content cannot be normally presented to the user, the decoding error flag in the TCP header is turned on (S804), and a confirmation response is returned (S805). The decode error flag will be described later.

  FIG. 10 shows the format of the TCP header applied in this embodiment. The transmission source port number and the destination port number are each 16-bit information, and identify an application that uses this TCP segment. Therefore, here, a number for identifying the application of the television receiver 100 and the application of the mobile phone 300 is described.

  The sequence number is a number that increases each time a TCP segment is sent, and is used to make the communication destination recognize the order of the TCP segments. In the present embodiment, as described above, the sequence number and the time stamp of the content are stored in association with each other, so that the reproduction position of the lost data can be specified even when an error occurs during communication.

  The acknowledgment number is a number for notifying the other party that the TCP segment has been correctly received, and is used together with the sequence number. Even if an error occurs during decoding in the mobile phone 300, the mobile phone 300 returns data describing this confirmation response number as long as the communication data can be normally received.

The reserved area is composed of 6 bits, and is an unused area reserved for future expansion in normal TCP / IP. In this embodiment, a part of this area is used to detect the presence or absence of a decoding error. FIG. 11 is an explanatory diagram of a reserved area. The upper 5 bits appended with “reservation” are not used in this embodiment, and normally “0” is stored. In the least significant bit labeled “decoding error”, “1” is stored when an error occurs in the decoder 309 of the mobile terminal 300, and “0” is stored when decoding is completed normally. By using the reserved area in this way, the television receiver 100 can detect a decoding error of the mobile phone 300.

  While a user is viewing content that can be controlled by the television receiver 100 on the telephone 300, when a communication error or decoding error frequently occurs due to a deterioration in the reception state, the user gives up viewing the content and performs communication. Is expected to cut. In addition, when it is difficult to receive radio waves, the television receiver 100 may stop transmission in response to this situation.

  Under such circumstances, when the user returns home, the user is expected to view the content that had to be abandoned halfway through the television receiver 100 at home. At this time, the user may re-view from the beginning, but in many cases, the user may view a part of the content that cannot be viewed on the go, that is, the part after the interrupted part. It is done.

  The television receiver 100 holds in the reproduction position storage unit 124 the position of the content that the user could not view on the mobile phone 300. When the user turns on the power after returning home, the television receiver 100 displays a message as shown in FIG. When the user selects “view only a portion that has not been viewed” on the displayed GUI using the remote control 116 or the operation unit 114 of the television receiver 100, the television receiver 100 is stored in the reproduction position storage unit 124. The playback start position is determined from the current time stamp, and an AV / C command for instructing playback from that position is transmitted to the D-VHS 130. As a result, the television receiver 100 reproduces and displays the content from the location that the user could not view.

  In this way, in this embodiment, the user can view the content that could not be viewed on the go with the television receiver without manually searching for the recording position.

  In the present embodiment, the stored content is described as an example of content that can be controlled by the television receiver, but the content from the broadcast wave is used, recording is started from a location that could not be presented, and after returning home, It is also possible to adopt a configuration in which this is presented.

  In this embodiment, the D-VHS content connected by IEEE 1394 is used as the stored content. However, the content can be changed to a configuration using an HDD (hard disk drive) or other device built in the television receiver.

  In this embodiment, communication is performed using TCP / IP, but other communication protocols may be used.

  In the present embodiment, retransmission is not performed in the case of a communication error and a decoding error, but a certain number of retransmissions may be attempted.

  In this embodiment, the error to be notified using the reserved area is only a decoding error, but other errors can be notified using an unused reserved area.

  In this embodiment, a mobile phone is used as an example of a mobile terminal, but the present invention can be applied to a configuration using a mobile communication device such as a car navigation system.

  The second embodiment of the present invention will be described below. The second embodiment has different features with respect to information stored when an error is detected according to the first embodiment and a content start position presentation method to the user. Only differences from the first embodiment will be described.

  FIG. 13 shows a schematic block diagram of a television receiver 100a according to the second embodiment. The same components as those of the television receiver 100 shown in FIG. As a difference from the television receiver 100, the television receiver 100 a includes a still image capture device 125.

The television receiver 100a transmits content to the mobile phone 300 by TCP / IP. Prior to content transmission, the television receiving device 100a acquires still image information of content corresponding to the corresponding time stamp in addition to the sequence number of the TCP / IP header and the time stamp of the content by the still image capturing device 125, and reproduces the playback position. Stored in the storage unit 124.

  When normal operation is confirmed by an acknowledgment (ACK) from the mobile terminal, the corresponding sequence number, time stamp, and still image information are cleared. On the other hand, when the TCP segment or the confirmation response is lost due to a communication error, or when a decoding error occurs, the television receiver 100a continues to hold the sequence number, time stamp, and still image information. The television receiver 100a keeps trying transmission unless there is a transmission stop request from the mobile phone 300 by the user.

  When the user is forced to give up viewing on the mobile phone 300 due to a communication error, decoding error, or the like when returning home, the user is expected to view the content on the television receiver 100a at home. At this time, the user may consider using a part of the content that could not be seen on the go.

The television receiver 100a holds the position of the content that the user could not view on the mobile phone 300 and the corresponding still image in the reproduction position storage unit 124. When the user turns on the power after returning home, the television receiver 100a displays a GUI (graphical user interface) as shown in FIG. 14 based on the information held in the reproduction position storage unit 124 as the image display unit 112. To display. When continuous content information is held in the reproduction position storage unit 124, the first still image is used as an index. A list of still images of contents that the user could not view is displayed as an index. When the user selects a specific still image using the remote controller 116 or the operation unit 114, the television receiver 100a transmits a reproduction request from that position to the D-VHS 130 , and the content from that position is reproduced.

  Through the above procedure, the user can visually check and view the desired content position on the television receiver without manually searching for the position of the content that could not be viewed on the go.

  In the present embodiment, the still image capture device 125 can be implemented as dedicated hardware or software.

  In this embodiment, the still images are stored one by one. However, the configuration may be such that still image data is acquired and displayed based on the time stamp of the content when the index is created.

  In this embodiment, the still images for specifying the playback position are displayed as indexes, but a slide show or other display / selection method may be used.

  A third embodiment of the present invention will be described. The third embodiment is different from the second embodiment in a method for presenting re-viewing content.

FIG. 15 shows a schematic block diagram of a television receiver 100b according to the third embodiment. The same components as those in the embodiment shown in FIGS. 1 and 13 are denoted by the same reference numerals. An HDD 126 is added to the television receiver 100b.

Television receiver 100b, prior to content transmission, in addition to the time stamp of the sequence number and the content of TCP / IP header, obtains the still image information of the content corresponding to the time stamp by the still picture capturing unit 125, the reproduction position location It is stored in the serial憶部124.

  When normal operation is confirmed by an acknowledgment (ACK) from the mobile terminal, the corresponding sequence number, time stamp, and still image information are cleared. On the other hand, when a communication error or a decoding error is detected, the sequence number, time stamp, and still image information are continuously held.

  When a communication error or a decoding error is detected continuously for a certain period, a digest stream of content that is not displayed due to the error is generated at the timing when normal communication and normal decoding are confirmed, and stored in the HDD 126. The period is a period from when an error is first detected until there is continuous information of a sequence number, a time stamp, and a still image. The HDD 126 records in a format suitable for viewing on the television receiver 100b. That is, the recording into the HDD 126 is not converted into a format suitable for the mobile phone 300.

  In the following description, when an error is detected but not continuous, the television receiving device 100b generates a 3-minute digest stream and stores it in the HDD 126.

  If the user is forced to give up viewing on the mobile phone 300 due to a communication error, a decoding error, or the like, the user is expected to view the content on the television receiver 100b at home when the user returns home. At this time, the user may consider using a part of the content that could not be seen on the go.

  By the means described above, the television receiving device 100b holds the position of the content that the user has not been able to view on the mobile phone 300 and the corresponding still image in the reproduction position storage unit 124.

When the user turns on the power after returning home, the television receiving device 100 b displays a GUI as shown in FIG. 14 on the image display unit 112 based on the information stored in the reproduction position storage unit 124. When continuous content information is held in the reproduction position storage unit 124, the first still image is used as an index. A list of still images of contents that the user could not view is displayed as an index. When a specific still image is selected by the remote controller 116 or the operation unit 114, the television receiving device 100b acquires the digest stream from the designated position accumulated in advance from the HDD 126 and causes the image display unit 112 to display the digest stream. Thereby, the user can visually confirm the desired content on the screen.

  With the above procedure, the user can easily confirm only the content from the desired position visually on the television receiver 100b without manually searching for the position of the content that could not be seen on the go.

  A fourth embodiment of the present invention will be described. The fourth embodiment is different from the first, second, and third embodiments described above in the method for storing the reproduction position information.

In the fourth embodiment, the television receivers 100, 100 a, and 100 b use the mobile phone to store the location information of the content that the user has not been able to view on the mobile phone 300 and the still image information corresponding thereto, When communication with 300 is cut off, it is transmitted together with a user ID to a server (not shown) connected to the Internet 403. The user ID is information used to identify the mobile phone 300 with which the television receivers 100, 100a, 100b are communicating, and the TCP / IP between the television receivers 100, 100a, 100b and the mobile phone 300. When the connection is established, it is transmitted from the mobile phone 300 to the television receivers 100, 100a, 100b . The television receivers 100, 100a, and 100b that have transmitted the information to the server delete the information from the reproduction position storage unit 124.

When the user is forced to give up viewing on the mobile phone 300 due to a communication error, a decoding error, or the like when returning home, the user is expected to view the content on the television receivers 100, 100a, 100b at home. Is done. The user inputs a user ID for identifying his / her mobile phone 300 to the television receivers 100, 100a and 100b . The television receivers 100, 100a, and 100b acquire information necessary for this purpose from the above-described server, and perform control so that the user can easily view again from a desired location.

By adopting such a configuration, not only the use of a plurality of users becomes comfortable, but also the resources of the television receivers 100, 100a, 100b can be used more effectively.

In the present embodiment, the television receivers 100, 100a, and 100b transmit information to the server when communication with the communication partner mobile phone 300 is cut off, but the information is transmitted one by one during communication. You may change to

The present invention can be implemented in various forms without departing from the spirit or main features thereof. Therefore, the above-described first to fourth embodiments are merely examples in all respects and should not be construed in a limited manner.

100, 100a, 100b: TV receiver 101: tuner 102: descrambler 103: demultiplexer 104: video decoder 105: audio decoder 106: data stream processing unit 107: memory unit 108: image configuration unit 109: display control unit 110: DAC
112: Image display unit 113: Audio output unit
114: Operation unit
115: Light receiving unit 116: Remote control
117: IC card control unit 118: CPU
120: Bus
121: IEEE 1394 interface 122: encoder 123: communication control unit 124: playback position storage unit 125: still image capture device 126: HDD
130: D-VHS
131: Printer

Claims (8)

A television receiver capable of communicating with a mobile terminal device connected via a network,
Playback control means for controlling playback of moving image data recorded on a recording medium ;
Communication means for transmitting the video data reproduced by the reproduction control means to the portable terminal device via the network;
Detecting means for detecting occurrence of a communication error in the network;
A storage that stores reproduction position information indicating a reproduction position of the moving image data when the communication error occurs when the detection unit detects the occurrence of the communication error during transmission of the moving image data. Means,
The television receiving apparatus characterized in that the reproduction control means can reproduce the moving image data recorded on the recording medium again from the reproduction position indicated by the reproduction position information stored in the storage unit. . The network is a network using TCP / IP,
The detection unit generates a communication error in the network when a response indicating that the mobile terminal device has successfully received the TCP / IP segment transmitted by the communication unit via the network is not returned. The television receiver according to claim 1, wherein the reception is detected. The storage means stores, in the storage unit, a still image corresponding to the reproduction position indicated by the reproduction position information together with the reproduction position information when the detection means detects the occurrence of the communication error.
The said reproduction | regeneration control means presents the said still image memorize | stored in the said memory | storage part, when reproduction | regeneration control of the said moving image data recorded on the said recording medium is given. TV receiver. A network system capable of communicating between a television receiver connected via a network and a mobile terminal device,
The portable terminal device
A decoder for decoding video data received from the television receiver via the network;
Detecting the occurrence of a decoding error of the decoder, and notifying means for notifying the occurrence of the decoding error to the television receiver via the network,
The television receiver is
Playback control means for controlling playback of moving image data recorded on a recording medium ;
Communication means for transmitting the video data reproduced by the reproduction control means to the portable terminal device via the network;
A storage that stores reproduction position information indicating a reproduction position of the moving image data when the decoding error occurs when the notification unit is notified of the occurrence of the decoding error during transmission of the moving image data. Means,
The network system, wherein the reproduction control unit can reproduce the moving image data recorded on the recording medium again from a reproduction position indicated by the reproduction position information stored in the storage unit. The network is a network using TCP / IP,
The network system according to claim 4, wherein the notification unit of the mobile terminal device uses a part of a TCP / IP header for notification of a decoding error. The storage means stores a still image of the moving image data corresponding to the reproduction position indicated by the reproduction position information together with the reproduction position information when the notification means notifies the occurrence of the decoding error;
The said reproduction | regeneration control means presents the said still image memorize | stored in the said memory | storage part, when reproduction | regeneration control of the said moving image data recorded on the said recording medium is given. Network system. A method for controlling a television receiver capable of communicating with a mobile terminal device connected via a network,
A playback control step for controlling playback of the moving image data recorded on the recording medium ;
Transmitting the reproduced moving image data to the portable terminal device via the network;
A detection step of detecting the occurrence of a communication error in the network;
A storage that stores reproduction position information indicating a reproduction position of the moving image data when the communication error occurs in the storage unit when the occurrence of the communication error is detected in the detection step during transmission of the moving image data And having steps
The method of controlling a television receiver , wherein the moving image data recorded on the recording medium can be reproduced again from the reproduction position indicated by the reproduction position information stored in the storage unit. A control method for a network system capable of communicating between a television receiver connected via a network and a mobile terminal device,
A playback control step in which the television receiver controls playback of moving image data recorded on a recording medium ;
Transmitting the reproduced video data from the television receiver to the portable terminal device via the network;
A decoding step in which the mobile terminal device decodes video data received from the television receiver via the network;
A notification step of detecting the occurrence of a decoding error and notifying the occurrence of the decoding error from the mobile terminal device to the television receiving device via the network;
When the television receiver is notified of the occurrence of the decoding error during transmission of the moving image data, the television receiver stores reproduction position information indicating the reproduction position of the moving image data when the decoding error occurs in the storage unit. A memory step;
A method for controlling a network system, wherein the moving image data recorded on the recording medium can be reproduced again from the reproduction position indicated by the reproduction position information stored in the storage unit.

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