JP2011010105A - Digital broadcast receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital broadcast receiver confirming a plurality of change information including change information concerned with a network acquired in the past.SOLUTION: The digital broadcast receiver for receiving a digital broadcast signal and acquiring a network information table from the received digital broadcast signal is equipped with: a change information recording means which, when change information concerned with a network is included in the network information table, acquires the change information from the network information table, and adds and records the acquired change information in a predetermined recording medium in each acquisition of the change information without erasing the change information acquired in the past and already recorded in the predetermined recording medium; a display instruction receiving means for receiving a display instruction of the change information concerned with the network; and a display means which, when the display instruction is received by the display instruction receiving means, displays a plurality of pieces of change information on a predetermined screen based on the plurality of pieces of change information recorded in the recording medium.

Description

  The present invention relates to a digital broadcast receiving apparatus.

  As a digital broadcast receiving device that receives a digital broadcast signal and obtains a network information table (NIT) from the received digital broadcast signal, broadcast station information such as EPG that is always received and NIT in digital broadcast, etc. When it is determined that the number of broadcast services has decreased by referring to the broadcast service group table, the acquired EPG and broadcast station information are compared, and the broadcast service that has ceased to exist or the newly added broadcast A broadcast receiving apparatus that detects a service and deletes a broadcast service that no longer exists from the broadcast service group list or adds a newly added broadcast service to the list is known (Patent Document 1). reference.).

  Also, the NIT periodically transmitted from the network is acquired, and service change information included in the NIT (information on services of other networks that are added, deleted, or changed after the present, and addition, deletion, or change) Information regarding the effective time when the service is valid) is compared with the service change information table, and if there is newly added service change information, a digital broadcast receiver that adds the information to the service change information table is known. (See Patent Document 2).

JP 2008-22047 A JP 2001-203948 A

  In the digital broadcasting standard, change information for notifying in advance that a change related to the network is performed is included in a part of the broadcast and is sent to the receiving device irregularly. The network change referred to here means, for example, a change in a frequency band used for broadcasting, a change in service contents, a multiplex addition / deletion, and the like. Conventionally, when such change information is sent from the broadcasting station side, the receiving device once displays the acquired change information on the television screen to inform the user of the contents of the change information. Until now, the change information acquired in this way has only been displayed once when acquired, so for example, it is not possible to meet the user's request to view a plurality of change information acquired in the past. It was.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a digital broadcast receiver capable of confirming a plurality of pieces of change information including change information relating to a network acquired in the past.

In order to achieve the above object, the present invention is a digital broadcast receiving apparatus that receives a digital broadcast signal and obtains a NIT from the received digital broadcast signal, and the NIT includes change information about the network. This change information is acquired from the NIT, and whenever the change information is acquired, the acquired change information is recorded on the recording medium without erasing the previously acquired change information already recorded on the predetermined recording medium. Change information recording means, a display instruction accepting means for accepting a display instruction for change information relating to the network, and a plurality of change information recorded on the recording medium when the display instruction is accepted by the display instruction accepting means. And a display unit for displaying the plurality of pieces of change information on a predetermined screen.
According to the present invention, when the display instruction from the user is received, a plurality of pieces of change information recorded on the recording medium are displayed on the screen of the receiving device. A plurality of change information including information can be confirmed.

  The change information recording means extracts at least change start time information, change work period information, and change type information from the descriptor notifying the change of the network included in the NIT as the change information. Further, it is also possible to extract a message relating to a network change from a descriptor for notifying a message included in the NIT and record the extracted information and message on the recording medium. That is, in a digital broadcast according to a predetermined standard, the NIT includes the descriptor as described above, and necessary change information can be obtained from this descriptor.

  Various display modes of the plurality of change information by the display means are conceivable. As an example, the display means is based on a combination of the change start time information, the change work period information, the change type information, and a message regarding the network change. Each change information may be displayed as a list in time series on one screen. With such a configuration, it is possible to overlook the contents of a plurality of pieces of change information acquired from the past to the latest in a list format. Alternatively, the display means selects the change information to be displayed from each change information including a combination of the change start time information, the change work period information, the change type information, and a network change message. The selection field may be displayed on the screen, and the change information selected through the selection field may be displayed on the screen. With this configuration, it is possible to arbitrarily select change information whose contents are to be confirmed from a plurality of pieces of change information acquired from the past to the latest, and confirm the contents of the selected change information.

  The technical idea of the present invention can be realized by means other than a digital broadcast receiving apparatus. For example, it is possible to grasp an invention of a method including processing steps executed by each configuration of the apparatus, and an invention of a computer-readable program that causes the apparatus to realize a function executed by each configuration of the apparatus. Furthermore, a digital broadcast receiving apparatus that receives a digital broadcast signal and obtains a NIT from the received digital broadcast signal, including a descriptor for notifying the NIT of a network change and a descriptor for notifying a message If there is a change information about the network, the change start time information, the change work period information, the change type information, and the descriptor for notifying the above message are used as the change information about the network. Extract a message ID for associating and extract a network change message from the descriptor for notifying the message associated with the message ID, and start extracting the extracted information every time change information is extracted Time information, change work period information, change type information and network A change information recording means for recording change information consisting of a combination with a message relating to a change in the recording information on the recording medium without erasing the previously acquired change information recorded on the predetermined recording medium, and a network Display instruction receiving means for receiving a change information display instruction from a menu field of a predetermined screen, and information on the change start time recorded on the recording medium when the display instruction is received by the display instruction receiving means A list of numbers assigned in chronological order to each change information consisting of a combination of the change work period information, change type information, and network change message is displayed on the above screen. There is also one configuration comprising display means for displaying change information corresponding to the number selected on the screen from among the above screens. It can be grasped as an invention.

It is the block diagram which showed schematic structure of the liquid crystal television. It is the figure which showed an example of the screen which showed the change information of the network. It is the figure which showed the other example of the screen which showed the change information of the network.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal television (liquid crystal TV) 10 according to the present embodiment. The liquid crystal TV 10 corresponds to an example of a digital broadcast receiver. The liquid crystal TV 10 generally includes a front end processing circuit 11, a decoding processing circuit 12, a microcomputer 13, a real time clock (RTC) 14, a liquid crystal panel 15, a remote control I / F 16, and a liquid crystal panel driving circuit 17. The backlight 19 and the backlight drive circuit 20 are included.

The backlight 19 is disposed on the back side of the liquid crystal panel 15 and irradiates the liquid crystal panel 15 from the back side. Under the control of the microcomputer 13, the backlight drive circuit 20 turns on / off the backlight 19 and adjusts the brightness at the time of lighting.
The front-end processing circuit 11 functions as a tuner that receives broadcast signals via the antenna 11a and the like. In the present embodiment, the front-end processing circuit 11 receives a digital broadcast signal of a predetermined standard (for example, a digital broadcast signal according to the European digital broadcast standard) as a radio wave having a frequency of a designated channel, and the received broadcast signal. Is converted into an intermediate frequency signal, the intermediate frequency signal as an analog signal is converted into a digital signal, and a transport stream (TS) is extracted from the digital signal. The front end processing circuit 11 outputs the extracted TS to the decoding processing circuit 12.

  The digital broadcast signal received by the front-end processing circuit 11 may be a terrestrial digital broadcast signal or a satellite digital broadcast signal. Further, the front-end processing circuit 11 may extract a TS by receiving a signal related to IP broadcasting by connecting to an IP (Internet Protocol) network, or may perform digital cable television (CATV) broadcasting via a cable. You may receive and extract TS from the received digital CATV broadcast.

  The decoding processing circuit 12 includes a descrambling circuit, a demultiplexing circuit, a decoding circuit, an image processing circuit, an OSD (on-screen display) circuit 12a, and the like, and descrambles the TS by the descrambling circuit. The descrambled TS is composed of a plurality of transport packets, and each transport packet stores various data such as a video signal, an audio signal, and SI (Service Information). The demultiplex circuit extracts a video signal and an audio signal relating to a channel designated by the user from the TS.

  The video signal and audio signal extracted from the TS are in a state of being encoded (encoded) according to the MPEG standard, and the decoding circuit decodes (decodes) the video signal and audio signal according to the MPEG standard. The image processing circuit performs various types of image processing such as scaling processing, color correction processing, and edge enhancement processing according to the number of pixels of the liquid crystal panel 15 on the decoded video signal, and represents an image for one screen. Generate a video signal. The decoding processing circuit 12 outputs the generated video signal to the liquid crystal panel driving circuit 17 via the OSD circuit 12a. The OSD circuit 12a generates an OSD signal corresponding to various displays based on data such as a control signal and character information input from the microcomputer 13, and superimposes the OSD signal on the video signal or only the OSD signal. Can be output to the liquid crystal panel drive circuit 17.

  The liquid crystal panel driving circuit 17 temporarily stores the video signal (including the OSD signal) input from the decoding processing circuit 12 in a predetermined frame memory, and outputs the stored signal to the liquid crystal panel 15 at a predetermined timing. Thus, each pixel of the liquid crystal panel 15 constituted by the pixel arrangement is driven, and an image based on the video signal is displayed on the liquid crystal panel 15.

  The remote control I / F 16 receives signals of various instructions (for example, a channel selection instruction, a menu screen display instruction, etc.) issued from a remote controller (not shown) outside the liquid crystal TV 10 based on a user operation. . The microcomputer 13 performs processing and control according to the instruction signal input via the remote control I / F 16. Although not shown in the figure, the liquid crystal TV 10 is a TV, such as an audio signal circuit for outputting audio based on the decoded audio signal, a speaker, and a power supply circuit for supplying driving power to each part of the liquid crystal TV 10. Each of the general configurations is provided.

  In such a configuration, when the received digital broadcast signal includes change information regarding the network, the liquid crystal TV 10 acquires the change information and records it on a predetermined recording medium each time. Here, the acquisition and recording process of the change information by the microcomputer 13 will be described. The microcomputer 13 instructs the decoding processing circuit 12 to acquire the NIT as SI from the TS in the course of the above processing by the decoding processing circuit 12. When the NIT includes a descriptor for notifying a network change and a descriptor for notifying a message, predetermined change information regarding the network is extracted from these descriptors (descriptors). For example, according to the European digital broadcasting standard (see ETSI EN 300 468), network_change_notify_descriptor is defined as a descriptor for notifying a network change as a kind of information included in the NIT, and as a descriptor for notifying a message. message_descriptor is specified.

  Therefore, when the network_change_notify_descriptor is obtained from the NIT, the microcomputer 13 acquires start_time_of_change, change_duration, change_type, and message_id from the network_change_notify_descriptor. start_time_of_change is information indicating the start time of the network change work (change process), change_duration is information indicating the change work period (the length of time required for the change work), change_type is information indicating the change type, and message_id Is an ID for associating with message_descriptor, and these are all defined as information included in network_change_notify_descriptor in the European digital broadcasting standard. The change_type represents the type of network change work (for example, change of frequency band used for broadcasting, change of service contents, addition / deletion of multiplex, etc.). Further, the microcomputer 13 acquires text_char (message) from the message_descriptor having the same message_id as the message_id. message_id and text_char are also defined as information included in the message_descriptor in the European digital broadcasting standard. The text_char is a character string for displaying a message related to the network change (message to be notified to the viewer when the network is changed).

  The microcomputer 13 stores a set of change information including start_time_of_change, change_duration, change_type, and text_char (message) regarding a certain change work of the network acquired (extracted) from each descriptor as described above in a predetermined memory (recording medium). ) Record in 13a. At this time, the microcomputer 13 additionally records the newly acquired change information in the memory 13a without deleting the previously acquired change information recorded in the memory 13a. As described above, the microcomputer 13 acquires the change information from the NIT when the NIT includes the change information regarding the network, and adds the change information to the memory 13a and records the change information every time the change information is acquired. It can be said that it functions as a recording means.

  Next, a case where the liquid crystal TV 10 displays the change information on the screen according to a user instruction will be described. The user can cause the liquid crystal TV 10 to display the change information regarding the network by operating the remote controller. That is, when the microcomputer 13 receives an instruction to display a predetermined menu screen from the remote controller via the remote control I / F 16, the microcomputer 13 displays the predetermined menu screen on the liquid crystal panel 15 and displays the menu screen. Thus, an instruction to display network change information can be received as an item in the menu. In this way, it can be said that the liquid crystal TV 10 includes a display instruction receiving unit in that it can receive a change information display instruction.

  When receiving the change information display instruction, the microcomputer 13 instructs the OSD circuit 12a to generate image data for displaying the network change information based on the change information already recorded in the memory 13a. Instruct. When the OSD circuit 12a receives the instruction from the microcomputer 13, the OSD circuit 12a generates image data (OSD signal) for displaying the change information based on the change information recorded in the memory 13a. It outputs to the liquid crystal panel drive circuit 17. As a result, network change information is displayed on the liquid crystal panel 15. That is, the liquid crystal TV 10 functions as a display unit that displays a plurality of pieces of change information on a predetermined screen when the display instruction receiving unit receives an instruction to display change information.

  FIG. 2 is an example of a screen showing network change information displayed on the liquid crystal panel 15. In FIG. 2, a plurality of pieces of change information are displayed in a list on the screen of the liquid crystal panel 15. In other words, each displayed change information is composed of start_time_of_change (change start time), change_duration (change work period), change_type (change type) and message, and each change information is displayed as a list in chronological order. Has been. In FIG. 2, each change information is numbered 1, 2, 3,..., Indicating that the change information with the smaller number is acquired (recording time) is older. That is, the OSD circuit 12 a generates an OSD signal representing a list display of change information as shown in FIG. 2 based on the change information recorded in the memory 13 a and outputs the OSD signal to the liquid crystal panel drive circuit 17. Note that the network change information displayed in a list in this way includes information indicating a change work that has already been executed and information indicating a change work that is scheduled to be executed in the future.

  The display mode of the network change information in the present embodiment is not limited to that shown in FIG. FIG. 3 is another example of a screen showing network change information displayed on the liquid crystal panel 15. In FIG. 3, a selection column (numbers 1, 2, 3,...) For selecting change information to be displayed from a plurality of pieces of change information is displayed on the screen, and arbitrarily selected via the selection column. Display change information on the screen. That is, in the upper area of the screen, numbers corresponding to the number of change information recorded in the memory 13a at that time are displayed as 1, 2, 3,..., And the user operates the remote controller or the like. By instructing the microcomputer 13 to select one of these numbers, change information (start_time_of_change (change start time), change_duration (change_duration) corresponding to the selected number (number “1” in the example of FIG. 3)) is selected. Change work period), change_type (change type) and change information comprising messages) are displayed in the lower area of the screen.

  In the display mode of FIG. 3 as well, numbers are assigned to each change information in chronological order, and the numbers 1, 2, 3,. This indicates that the recorded time (recording time) is old. That is, the OSD circuit 12a, based on the change information recorded in the memory 13a, selects a column according to the number of change information as shown in FIG. 3 and one change information selected at that time (however, by default) For example, the OSD signal for displaying the content related to the change information having the smallest number is generated and output to the liquid crystal panel drive circuit 17.

  As described above, according to the present embodiment, the liquid crystal TV 10 includes a descriptor (network_change_notify_descriptor) for notifying the NIT acquired from the received digital broadcast signal and a descriptor (message_descriptor) for notifying the message. If there is a network_change_notify_descriptor, start_time_of_change (change start time), change_duration (change work period), change_type (change type) are obtained from the network_change_notify_descriptor, and a message is obtained from the message_descriptor. Change information obtained by combining the acquired start_time_of_change (change start time), change_duration (change work period), change_type (change type) and message in the past recorded in the memory 13a. Without erasing In addition to recording on the recording medium of the memory 13a, when a user instructs to display network change information, a plurality of change information including past change information recorded in the memory 13a is listed on the screen. I wanted to display it. For this reason, when the change information of the network is acquired on the receiver side, a plurality of change information including the change information acquired in the past, which cannot be achieved with the conventional configuration of displaying the change information only once, is collected. Can be provided to the user.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal television, 11 ... Front end processing circuit, 12 ... Decoding processing circuit, 12a ... OSD circuit, 13 ... Microcomputer, 13a ... Memory, 14 ... Real time clock, 15 ... Liquid crystal panel, 16 ... Remote control I / F , 17 ... Liquid crystal panel drive circuit, 19 ... Backlight, 20 ... Backlight drive circuit

Claims (5)

A digital broadcast receiver that receives a digital broadcast signal and acquires a network information table from the received digital broadcast signal,
When the network information table includes change information regarding the network, the change information is acquired from the network information table, and each time the change information is acquired, the acquired change information is recorded in the past on a predetermined recording medium. Change information recording means for additionally recording on the recording medium without erasing the acquired change information,
Display instruction accepting means for accepting a display instruction of change information related to the network;
Display means for displaying the plurality of change information on a predetermined screen based on the plurality of change information recorded on the recording medium when the display instruction is received by the display instruction receiving means. A digital broadcast receiver characterized by the above.   The change information recording means extracts at least change start time information, change work period information, and change type information from the descriptor for notifying the network change included in the network information table as the change information. And extracting a message relating to a network change from a descriptor for notifying a message included in the network information table, and recording each of the extracted information and message on the recording medium. Item 4. The digital broadcast receiver according to Item 1.   The display means displays the change information including a combination of the change start time information, the change work period information, the change type information, and a network change message in a single screen in a time series. The digital broadcast receiver according to claim 2.   The display means is for selecting change information to be displayed from each change information including a combination of the change start time information, change work period information, change type information, and a network change message. 3. The digital broadcast receiving apparatus according to claim 2, wherein a selection field is displayed on the screen, and change information selected through the selection field is displayed on the screen. A digital broadcast receiver that receives a digital broadcast signal and acquires a network information table from the received digital broadcast signal,
When the network information table includes a descriptor for notifying a network change and a descriptor for notifying a message, the change information about the network is changed from the descriptor notifying the network change to the change start time. For extracting information, information on change work period, change type information, and message ID for associating the descriptor for notifying the message and notifying the message associated with the message ID Each time a change message is extracted from the descriptor, a change consisting of a combination of the change start time information, change work period information, change type information, and network change message is extracted. Information recorded in the past on a specified recording medium A change information recording means for recording in addition to the recording medium without erasing the acquired change information,
A display instruction receiving means for receiving a display instruction of change information related to the network from a menu field of a predetermined screen;
When the display instruction is received by the display instruction receiving means, a combination of the change start time information, the change work period information, the change type information, and the network change message recorded on the recording medium A list of numbers assigned in a time series to each change information consisting of is displayed on the screen, and change information corresponding to a number selected on the screen from the displayed numbers is displayed on the screen. A digital broadcast receiving apparatus comprising: a display unit.

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