JP2005094103A - Signal receiving apparatus and method, recording medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to efficiently utilize a nonvolatile memory area. <P>SOLUTION: An area ID acquisition section 82 decides whether a network ID from a network ID acquisition section 81 is registered in an area cross-reference table, decides whether a free area not corresponding to the network ID exists in the area cross-reference table when no network ID is registered, and outputs the area ID of the free area to a network ID registration section 84 when the free area exists. The network ID registration section 84 registers the network ID from the network ID acquisition section 81 to the area cross-reference table by correlating the network ID to the area ID from the area ID acquisition section 82, and outputs the area ID corresponding to the network ID to a memory access section 86. The signal receiving apparatus or the like is applicable to video signal receivers for receiving and displaying a signal of the terrestrial digital television broadcast. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a signal receiving apparatus and method, a recording medium, and a program, and more particularly, to a signal receiving apparatus and method, a recording medium, and a program that can efficiently use a nonvolatile memory area.

  Conventionally, in a receiving device that receives digital broadcasting of BS (Broadcasting Satellite) or CS (Communication Satellite), there are as many non-volatile memory areas as the number of channels provided by all broadcast content providers (broadcast stations). It is rare for users to select channels for all broadcast stations, and because all broadcast stations did not broadcast data broadcast content that uses non-volatile memory areas, there were many areas that were wasted. .

  Therefore, in the receiver, it has been proposed to reduce the non-volatile memory area in order to reduce the wasted area. However, in this case, the non-volatile memory area is often used up, and when all of the non-volatile memory area is used up, the access from the data broadcasting content of the new broadcasting station may fail, Alternatively, as disclosed in Patent Document 1, a user interface must be provided to the user to select an area to be deleted from the nonvolatile memory area.

  Correspondingly, in terrestrial digital television broadcasting, in the receiver, the area of the non-volatile memory is not allocated to the channels of all the broadcasting stations, and remote control (hereinafter referred to as remote control) It is stipulated that a non-volatile memory area is allocated only to a channel of a broadcasting station registered so that a channel can be selected from a direct selection key.

JP 2001-78103 A

  However, according to the above-mentioned terrestrial digital television broadcast regulations, the receiver cannot read / write data broadcast content of a broadcast station channel that is not registered in the direct selection key of the remote control in the nonvolatile memory area. There is a problem that the user cannot enjoy the data broadcasting content of the channel of the broadcasting station that is not registered in the direct selection key of the remote controller.

  Further, when the user changes the setting of the direct selection key of the remote controller, there is a problem that the contents of the nonvolatile memory stored so far are immediately erased. Furthermore, when the reception environment for data broadcasting contents changes, such as when the user moves, there is a problem that the contents written to all the nonvolatile memory areas may become invalid.

  The present invention has been made in view of such a situation, and makes it possible to efficiently use a nonvolatile memory area.

  The signal receiving apparatus according to the present invention receives the received broadcast in the area correspondence table indicating the correspondence between the network ID for identifying the channel of the data broadcast content included in the broadcast signal and the area ID for identifying the area of the nonvolatile memory. Corresponding area determination means for determining whether or not the network ID of the signal data broadcast content is registered, and when the corresponding area determination means determines that the network ID is not registered in the area correspondence table, A free area determination unit that determines whether or not there is a free area ID that does not correspond to any network ID, and if the free area determination unit determines that there is a free area ID in the area correspondence table, the free area ID is Area table registration means for registering the network ID in the area correspondence table in association with the area, To a region of the nonvolatile memory free space ID associated with the network ID by Buru registering means, characterized in that it comprises a writing means for writing predetermined information of the data broadcast content.

  When the free area determination means determines that there is no free area ID in the area correspondence table, it shows the correspondence between the key ID for identifying the channel selection key of the remote controller for the user to select the channel and the network ID Corresponding key judging means for judging whether or not a network ID is registered in the key correspondence table, and when the correspondence key judging means judges that the network ID is registered in the key correspondence table, it is registered in the key correspondence table. A region detection unit that detects a region ID corresponding to another network ID registered in the region correspondence table, and a non-volatile area ID corresponding to the other network ID detected by the region detection unit And an area initialization means for initializing the area of the volatile memory, and the area table registration means In association with the area ID of the initialized nonvolatile memory area by the step, the network ID may be adapted to register the region correspondence table.

  When it is determined by the corresponding area determining means that the network ID is registered in the area correspondence table, the writing means reads / writes predetermined information of the data broadcast content to / from the non-volatile memory area of the area ID corresponding to the network ID. To be able to.

  The signal receiving method according to the present invention is based on the area correspondence table indicating the correspondence between the network ID for identifying the channel of the data broadcast content included in the broadcast signal and the area ID for identifying the area of the nonvolatile memory. Corresponding area determination step for determining whether or not the network ID of the data broadcasting content of the signal is registered, and if it is determined that the network ID is not registered in the area correspondence table by the processing of the corresponding area determining step When it is determined that there is an empty area ID in the area correspondence table by the processing of the empty area determining step for determining whether there is an empty area ID that does not correspond to any network ID in the table and the empty area determining step, The network ID is registered in the area correspondence table in association with the free area ID. An area table registration step; and a writing step of writing predetermined information of the data broadcast content into the area of the non-volatile memory having the free area ID associated with the network ID by the process of the area table registration step. And

  The program recorded on the recording medium of the present invention is stored in the area correspondence table indicating the correspondence between the network ID for identifying the channel of the data broadcast content included in the broadcast signal and the area ID for identifying the area of the nonvolatile memory. The corresponding area determining step for determining whether or not the network ID of the data broadcast content of the received broadcast signal is registered, and the corresponding area determining step determines that the network ID is not registered in the area corresponding table. If there is a free area ID in the area correspondence table by the process of the free area determination step for determining whether there is a free area ID that does not correspond to any network ID in the area correspondence table and the free area determination step. If determined, the network ID is assigned to the area in association with the free area ID. An area table registration step for registering in the response table, and a writing step for writing predetermined information of the data broadcast content to the area of the non-volatile memory having the free area ID associated with the network ID by the process of the area table registration step. It is characterized by including.

  The program of the present invention stores the received broadcast signal in the area correspondence table indicating the correspondence between the network ID for identifying the channel of the data broadcast content included in the broadcast signal and the area ID for identifying the area of the nonvolatile memory. When it is determined that the network ID is not registered in the region correspondence table by the corresponding region determination step for determining whether or not the network ID of the data broadcasting content is registered, and the processing of the corresponding region determination step, the region correspondence table A free area determination step for determining whether or not there is a free area ID that does not correspond to any network ID, and if it is determined that there is a free area ID in the area correspondence table by the processing of the free area determination step, a free area Area where the network ID is registered in the area correspondence table in association with the ID. A table registration step; and a writing step of writing predetermined information of the data broadcast content into the non-volatile memory area of the free area ID associated with the network ID by the process of the area table registration step. To do.

  In the present invention, the received broadcast signal data is stored in the area correspondence table indicating the correspondence between the network ID for identifying the channel of the data broadcast content included in the broadcast signal and the area ID for identifying the area of the nonvolatile memory. When it is determined whether or not the network ID of the broadcast content is registered, and it is determined that the network ID is not registered in the area correspondence table, an empty area ID that does not correspond to any network ID is stored in the area correspondence table. It is determined whether or not there is. If it is determined that there is a free area ID in the area correspondence table, the network ID is registered in the area correspondence table in association with the free area ID, and the nonvolatile memory of the free area ID associated with the network ID is stored. Predetermined information of the data broadcast content is written in the area.

  According to the present invention, the nonvolatile memory area can be efficiently used. Furthermore, according to the present invention, even if the channel setting of the remote controller changes, the contents written in the nonvolatile memory area can be used.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode of the present invention will be described below. The correspondence relationship between the disclosed invention and the embodiments is exemplified as follows. Although there are embodiments which are described in this specification but are not described here as corresponding to the invention, the embodiments correspond to the invention. It does not mean that it is not a thing. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean all the inventions described in the specification. In other words, this description is for the invention described in the specification and not claimed in this application, i.e., for the invention that will be applied for in the future or that will appear as a result of amendment and added. It does not deny existence.

  According to the present invention, a signal receiving device (for example, the video signal receiving device 1 in FIG. 1) for receiving a broadcast signal is provided. This signal receiving apparatus shows a correspondence relationship between a network ID for identifying a channel of data broadcast content included in a broadcast signal and an area ID for identifying an area of a nonvolatile memory (for example, the nonvolatile memory 55 in FIG. 2). Corresponding area determination means for determining whether or not the network ID of the data broadcast content of the received broadcast signal is registered in the area correspondence table (for example, the area correspondence table 101 in FIG. 4) (for example, step S3 in FIG. 6). 3, which executes the process of FIG. 3 and the corresponding region determination means, when it is determined that the network ID is not registered in the region correspondence table, any network ID is supported in the region correspondence table. Free space determination means for determining whether there is a free space ID (for example, the process of step S4 in FIG. 6 is executed). The area table for registering the network ID in the area correspondence table in association with the free area ID when it is determined that there is a free area ID in the area correspondence table by the area ID acquisition unit 82) in FIG. Predetermined information of the data broadcast content is written into the area of the non-volatile memory having the free area ID associated with the network ID by the registration means (for example, the network ID registration unit 84 in FIG. 3) and the area table registration means. And writing means (for example, the memory access unit 86 in FIG. 3).

  This signal receiving apparatus includes a key ID for identifying a tuning key of a remote controller for a user to instruct channel selection, and a network ID when it is determined by the vacant area determining means that there is no vacant area ID in the area correspondence table. Corresponding key determination means for determining whether or not the network ID is registered in the key correspondence table (for example, the remote control key correspondence table 121 in FIG. 8) indicating the correspondence relationship with (for example, the process of step S6 in FIG. 6). When it is determined that the network ID is registered in the key correspondence table by the area ID acquisition unit 82) in FIG. 3 to be executed and the corresponding key determination means, the area correspondence table is not registered in the key correspondence table. A region detecting means for detecting a region ID corresponding to another network ID registered in the network (for example, the process of step S7 in FIG. 6). 3 for executing the above and area initialization means for initializing the area of the nonvolatile memory having the area ID corresponding to the other network ID detected by the area detection means (for example, the area of FIG. 3). And an area table registration means (for example, the network ID registration section 84 in FIG. 3) is associated with the area ID of the area of the nonvolatile memory initialized by the initialization means. The ID can be registered in the area correspondence table.

  According to the present invention, a signal receiving method for receiving a broadcast signal is provided. In this signal reception method, an area correspondence table showing a correspondence relationship between a network ID for identifying a channel of data broadcast content included in a broadcast signal and an area ID for identifying an area of a nonvolatile memory is stored in the area correspondence table. If the network ID of the data broadcast content is not registered in the region correspondence table by the corresponding region determination step (for example, step S3 in FIG. 6) for determining whether or not the network ID of the data broadcasting content is registered and the processing of the corresponding region determination step. If it is determined, a free area determination step (for example, step S4 in FIG. 6) for determining whether or not there is a free area ID that does not correspond to any network ID in the area correspondence table, and processing of the free area determination step If it is determined that there is a free area ID in the area correspondence table, Correspondingly, an area table registration step (for example, step S10 in FIG. 6) for registering the network ID in the area correspondence table, and a non-volatile memory of the free area ID associated with the network ID by the processing of the area table registration step. And a writing step (for example, step S12 in FIG. 6) for writing predetermined information of the data broadcast content to the area.

  Note that the recording medium and program of the present invention have basically the same configuration as that of the signal receiving method of the present invention described above, and therefore will not be described because they are repeated.

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

  FIG. 1 shows a configuration example of a video signal receiving apparatus 1 to which the present invention is applied. In the case of the example of FIG. 1, the video signal receiving apparatus 1 receives and selects a digital terrestrial television broadcast signal via an antenna 2 based on an operation of a remote controller (hereinafter referred to as a remote controller) 3 by a user. And displayed on the built-in display 22 or the like.

  The remote control 3 has a direct selection key consisting of 1 to 12 numeric buttons, a selection key consisting of up and down buttons, various function buttons, and the like. A light emitting unit (not shown) of the remote control 3 is displayed on the video signal receiving device 1 by the user. An instruction signal (infrared signal) is transmitted to the video signal receiving device 1 by being directed to the light receiving unit 26 and pressing (operating) those keys or buttons.

  In the video signal receiving device 1 of FIG. 1, a CPU (Central Processing Unit) 11 is a program stored in a ROM (Read Only Memory) 12, a program loaded in a RAM (Random Access Memory) 13, or In accordance with a user instruction signal obtained via the operation unit 25 or the light receiving unit 26, each unit of the video signal receiving apparatus 1 is controlled to execute various processes. The RAM 13 also appropriately stores data necessary for the CPU 11 to execute various processes.

  The CPU 11, ROM 12, and RAM 13 are connected to each other via a bus 14. Further, a tuner 15, a front end unit 16, a demultiplexer 17, a decoder unit 18, an OSD (On Screen Display) unit 19, a video signal processing unit 20, and an audio signal processing unit 21 are connected to the bus 14. A predetermined process is executed according to the control.

  The tuner 15 selects a broadcast signal received via the antenna 2 and outputs the selected signal to the front end unit 16. The front end unit 16 converts the signal from the tuner 15 into a digital signal, demodulates it, and outputs it to the demultiplexer 17. The demultiplexer 17 separates the multiplexed digital signal transport stream into a stream such as video or audio data or section data. The demultiplexer 17 outputs video data and audio data to the decoder unit 18 and outputs section data to the CPU 11. The decoder unit 18 decodes the video data from the demultiplexer 17 and outputs it to the video signal processing unit 20, and also decodes the audio data from the demultiplexer 17 and outputs it to the audio signal processing unit 21.

  The CPU 11 expands each piece of information of the section data from the demultiplexer 17 in the RAM 13. The section data includes SI (Service Information) information, PSI (Program Specific Information) information, data broadcast content information, and the like. The CPU 11 expands the data broadcast content information of the section data in the RAM 13, converts it into a predetermined format, and outputs it to the OSD unit 19. The OSD unit 19 generates data broadcast content screen information based on the data broadcast content information from the CPU 11 and outputs it to the video signal processing unit 20.

  The video signal processing unit 20 adds (superimposes) the data broadcast content screen information from the OSD unit 19 to the video data from the demultiplexer 18, converts it into a signal in the NTSC format, and displays the video data on the display 22. Let The audio signal processing unit 21 causes the audio data from the demultiplexer 18 to be output from the speaker 23.

  The CPU 11 is also connected to the input / output interface 24. The input / output interface 24 includes input buttons, dials, and the like. The input / output interface 24 receives a user instruction signal (infrared signal) from the operation unit 25 that outputs a user instruction signal to the CPU 11 and the remote controller 3, and receives the user instruction signal. , A light receiving unit 26 that outputs to the CPU 11, a communication unit 27 that performs communication processing via a telephone line or a network (not shown), and information on the operation of the video signal receiving device 1 that is installed in the front part of the video signal receiving device 1 main body. A display unit 28 composed of an FL (Fluorescent) tube or the like for displaying the above is connected.

  A drive 29 is connected to the input / output interface 24 as necessary, and a removable recording medium 30 made of a recording medium such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is appropriately mounted. The drive 29 is used when data is read from or written to the removable recording medium 30. The computer program read from the removable recording medium 30 is installed in the ROM 13 or a storage unit (not shown) as necessary. The computer program may be distributed by the communication unit 27 via a network or the like.

  FIG. 2 is a block diagram illustrating a functional configuration example of the video signal receiving apparatus 1. The functional blocks shown in FIG. 2 are realized by executing a predetermined control program by the CPU 11 of FIG.

  The channel selection control unit 51 has a remote control key correspondence table (FIG. 8 to be described later) showing the correspondence between the direct selection keys (numeric buttons) of the remote controller 3 and the channels of the broadcast station. This remote control key correspondence table is stored in the SI information database (DB) 52 when the video signal receiving apparatus 1 is shipped, installed, forced channel scan, or when the setting of the remote control 3 is changed. It is generated by the channel selection control unit 51 based on SI information and the like. When the channel selection control unit 51 receives a direct selection key designation signal from the user via the light receiving unit 26, the channel selection control unit 51 receives the channel information corresponding to the direct selection key designation signal from the user based on the remote control key correspondence table. And the acquired channel information is output to the tuner 15. The channel information includes a network ID for identifying a broadcast station (broadcast content provider) and a service ID for identifying the type of service (channel) provided by the broadcast station. In the SI information DB 52, SI and PSI information from the section data acquisition unit 53 is analyzed and stored as information necessary for channel selection.

  The section data acquisition unit 53 receives the section data separated by the demultiplexer 17 and is necessary for displaying (reproducing) data broadcast content such as SI information, PSI information, and data broadcast content information from the section data. The file data is acquired, and the acquired file data is output to the data broadcast control unit 54. Further, the section data acquisition unit 53 outputs the acquired SI information and PSI information to the SI information DB 52.

  The data broadcast control unit 54 interprets the data broadcast content broadcast as the data broadcast among the broadcast signals, and displays it on the display 22 via the OSD unit 19 and the video signal processing unit 20. That is, the data broadcast control unit 54 interprets the file data necessary for displaying the data broadcast content from the section data acquisition unit 53, converts it into a predetermined format, and outputs it to the OSD unit 19. Further, the data broadcast control unit 54 inputs an instruction signal from the user via the light receiving unit 26, and in response to the instruction signal, the inside of the video signal receiving apparatus 1 such as drawing and communication described in the data broadcast content is received. It also controls processing.

  Here, some data broadcast contents have request information for access (read / write) to the nonvolatile memory 55. The access request information to the non-volatile memory 55 is, for example, when the data broadcast content is a game data broadcast content, such as the name of the data broadcast content, the name of the user, and the score obtained by the user. This is request information for writing user information or the like in the nonvolatile memory 55 or request information for reading information written in the nonvolatile memory 55.

  On the other hand, in the video signal receiving apparatus 1, the nonvolatile memory 55 is divided into areas corresponding to the number of direct selection keys (for example, 12) of the remote controller 3. Therefore, the data broadcast control unit 54 associates each area of the non-volatile memory 55 with an area ID for identifying each area so that writing from only one broadcasting station channel is performed for each area. Then, an area correspondence table showing the correspondence between the associated area ID and the network ID of the channel of the broadcasting station that accesses the area ID is set, and the nonvolatile memory 55 is set based on the area correspondence table. Control reading and writing of data.

  FIG. 3 is a block diagram illustrating a detailed functional configuration example of the data broadcast control unit 54 of FIG. In the example of FIG. 3, the data broadcast control unit 54 includes a network ID acquisition unit 81, a region ID acquisition unit 82, a remote control key correspondence table acquisition unit 83, a network ID registration unit 84, a region initialization unit 85, and a memory access unit 86. Consists of.

  When the file data is input from the section data acquisition unit 53, the network ID acquisition unit 81 determines whether the data broadcast content has access request information for accessing the nonvolatile memory 55, and determines that there is access request information. In this case, the network ID for identifying the channel of the data broadcasting content being received is acquired from the SI information of the file data, and the acquired network ID is output to the area ID acquisition unit 82 and the network ID registration unit 84.

  When the network ID is input from the network ID acquisition unit 81, the region ID acquisition unit 82 determines whether the input network ID is registered in the region correspondence table, and the network ID is registered in the region correspondence table. If it is determined, the area ID corresponding to the network ID is output to the memory access unit 86. On the other hand, when it is determined that the network ID is not registered in the area correspondence table, when the access request information is a read request, the corresponding data is not written in the non-volatile memory 55, so the processing ends. However, when the access request information is a write request, the area ID acquisition unit 82 determines whether there is an area that does not correspond to any network ID (that is, a free area) in the area correspondence table, The area ID of the empty area in the area correspondence table is output to the network ID registration unit 84.

  Furthermore, when the area ID acquisition unit 82 determines that there is no free area in the area correspondence table, the remote control key correspondence table acquisition unit 83 acquires the remote control key correspondence table from the channel selection control unit 51 and displays the remote control key correspondence table in the remote control key correspondence table. When it is determined whether or not the network ID from the network ID acquisition unit 81 is registered, and it is determined that the network ID from the network ID acquisition unit 81 is registered in the remote control key correspondence table, the remote control key correspondence table Other network IDs that are not registered in the area are detected from the area correspondence table, and the area IDs corresponding to the detected other network IDs are output to the area initialization unit 85.

  The remote control key correspondence table acquisition unit 83 acquires a remote control key correspondence table from the channel selection control unit 51 based on the control of the region ID acquisition unit 82, and outputs the acquired remote control key correspondence table to the region ID acquisition unit 82. When the region ID is input from the region ID acquisition unit 82 or the region initialization unit 85, the network ID registration unit 84 associates the network ID from the network ID acquisition unit 81 with the region correspondence table in association with the input region ID. The region ID associated with the network ID is output to the memory access unit 86.

  When the region ID is input from the region ID acquisition unit 82, the region initialization unit 85 initializes the region of the nonvolatile memory 55 corresponding to the input region ID, and sets the region ID of the initialized region as the network ID. The data is output to the registration unit 84. When the area ID is input from the area ID acquisition unit 82 or the network ID registration unit 84, the memory access unit 86 receives predetermined data from the area ID acquisition unit 82 or the network ID based on the access instruction information of the data broadcast content. Write to the area of the nonvolatile memory 55 corresponding to the area ID from the registration unit 84. In addition, the memory access unit 86 reads data written in the area of the nonvolatile memory 55 corresponding to the area ID from the area ID acquisition unit 82 based on the access instruction information of the data broadcast content.

  FIG. 4 shows a configuration example of the area correspondence table 101 included in the data broadcast control unit 54.

  In the case of the example of FIG. 4, the area correspondence table 101 identifies an area ID that is an identification number of each area of the nonvolatile memory 55 and a channel that can perform data read / write (access) to each area ID. It consists of a network ID. In the example of FIG. 4, an initial state in which the video signal receiving apparatus 1 has not yet written from the data broadcast content is shown, and the network ID is not registered in the area correspondence table 101. Therefore, in the area correspondence table 101, the network IDs corresponding to the area IDs “0” to “11” are all “0 (unregistered)”.

  FIG. 5 shows a correspondence relationship between the area correspondence table 101 of FIG. 4 and the nonvolatile memory 55. In the example of FIG. 5, the non-volatile memory 55 is composed of 12 areas A to L corresponding to the number of direct selection keys of the remote controller 3 (12 in the example of FIG. 5).

  In the example of FIG. 5, the area ID “0” of the area correspondence table 101 is shown to correspond to the area A of the non-volatile memory 55, and the area ID “1” of the area correspondence table 101 is non-volatile. The area ID “2” of the area correspondence table 101 corresponds to the area C of the nonvolatile memory 55. Hereinafter, although illustration is omitted, similarly, the area ID “3” of the area correspondence table 101 corresponds to the area D of the non-volatile memory 55, and the area ID “4” of the area correspondence table 101 is non-volatile. The area ID “5” of the area correspondence table 101 corresponds to the area F of the nonvolatile memory 55, and the area ID “6” of the area correspondence table 101 corresponds to the area E of the nonvolatile memory 55. This corresponds to the region G. The area ID “7” of the area correspondence table 101 corresponds to the area H of the non-volatile memory 55, and the area ID “8” of the area correspondence table 101 corresponds to the area I of the non-volatile memory 55. The area ID “9” corresponds to the area J of the nonvolatile memory 55, and the area ID “10” of the area correspondence table 101 corresponds to the area K of the nonvolatile memory 55. The area ID “11” in the area correspondence table 101 corresponds to the area L of the nonvolatile memory 55.

  As described above, each area of the nonvolatile memory 55 is associated with an area ID for identifying the area, and further, the area ID is associated with the network ID of the channel of the broadcasting station of the data broadcast content. By managing as the table 101, when there is access request information in the data broadcast content, the area ID corresponding to the network ID of the data broadcast content is acquired based on the area correspondence table 101, and the acquired area ID corresponds. Reading / writing to the area of the non-volatile memory 55 is executed.

  Next, the operation of the video signal receiving apparatus 1 will be described.

  The user uses the remote control 3 to instruct the selection of a broadcast station that broadcasts the desired data broadcast content. The light receiving unit 26 outputs an instruction signal from the remote controller 3 by the user to the channel selection control unit 51. When the designation of the direct selection key from the user is input via the light receiving unit 26, the channel selection control unit 51 acquires channel information corresponding to the designated direct selection key based on the remote control key correspondence table. The acquired channel information is output to the tuner 15. The tuner 15 selects a broadcast signal received via the antenna 3 based on the channel information from the channel selection control unit 51, and outputs the selected signal to the front end unit 16. The front end unit 16 receives the signal from the tuner 15, converts it to a digital signal, demodulates it, and outputs it to the demultiplexer 17.

  The demultiplexer 17 receives the transport stream of the multiplexed digital signal and separates it into a stream such as video or audio data or section data. Then, the demultiplexer 17 outputs the video data and audio data to the decoder unit 18. The decoder unit 18 decodes the video data from the demultiplexer 17 and outputs it to the video signal processing unit 20.

  Further, the demultiplexer 17 outputs the section data to the section data acquisition unit 53. The section data acquisition unit 53 inputs the section data separated by the demultiplexer 17 and, from the section data, file data necessary for displaying data broadcast content such as SI information, PSI information, and data broadcast content information. The acquired file data is output to the data broadcast control unit 54.

  When the file data of the data broadcast content is input from the section data acquisition unit 53, the data broadcast control unit 54 interprets the file data necessary for displaying the data broadcast content from the section data acquisition unit 53, and performs predetermined processing. The data is converted into a format and output to the OSD unit 19. The OSD unit 19 generates data broadcast content screen information based on the data broadcast content information from the CPU 11 and outputs it to the video signal processing unit 20. The video signal processing unit 20 adds (superimposes) the data broadcast content screen information from the OSD unit 19 to the video data from the demultiplexer 18, converts it into a signal in the NTSC format, and displays the video data on the display 22. Let

  As described above, the video signal receiving apparatus 1 receives the broadcast signal and displays the broadcast content or the data broadcast content included in the broadcast signal.

  When the file data of the data broadcast content is input from the section data acquisition unit 53, the data broadcast control unit 54 executes a memory access control process for the nonvolatile memory 55 in parallel with the above-described process. This memory access control process will be described with reference to the flowchart of FIG. In the example of FIG. 6, the case where the access request information of the data broadcast content is the write request information will be described.

  When the file data of the data broadcast content is input from the section data acquisition unit 53, the network ID acquisition unit 81 stores the data broadcast content in the nonvolatile memory 55 based on the file data from the section data acquisition unit 53 in step S1. If it is determined whether there is access request information (write request information) for the data broadcast, and if it is determined that there is access request information in the data broadcast content, the process proceeds to step S2 and the SI information of the file data from the section data acquisition unit 53 The network ID for identifying the channel of the data broadcasting content being received is acquired, and the acquired network ID is output to the area ID acquisition unit 82 and the network ID registration unit 84, and the process proceeds to step S3.

  When the network ID is input from the network ID acquisition unit 81, the region ID acquisition unit 82 determines whether or not the network ID from the network ID acquisition unit 81 is registered in the region correspondence table 101 in step S3. If it is determined that the network ID is not registered in the area correspondence table 101, the process proceeds to step S4, and it is determined whether or not there is an area (that is, a free area) that does not correspond to the network ID in the area correspondence table 101. To do.

  If the area ID acquisition unit 82 determines in step S4 that there is no free area in the area correspondence table 101, the area ID acquisition unit 82 proceeds to step S5, controls the remote control key correspondence table acquisition unit 83, and selects the remote control key from the channel selection control unit 51. The correspondence table is acquired, and the process proceeds to step S6, in which it is determined whether or not the network ID acquired by the network ID acquisition unit 81 is registered in the remote control key correspondence table from the remote control key correspondence table acquisition unit 83.

  If the area ID acquisition unit 82 determines in step S6 that the network ID is registered in the remote control key correspondence table, the area ID acquisition unit 82 proceeds to step S7 and assigns another network ID that is not registered in the remote control key correspondence table to the area ID. The area ID corresponding to the detected other network ID is acquired from the correspondence table 101, the acquired area ID is output to the area initialization unit 85, and the process proceeds to step S8.

  In the video signal receiving apparatus 1, the size of the area correspondence table 101 is set to be the same as the remote control key correspondence table or larger than the remote control key correspondence table. Therefore, when the network ID is registered in all the area IDs of the area correspondence table 101 and there is no free area in the area correspondence table 101, the data broadcast content of the network ID registered in the remote control key correspondence table is transferred to the nonvolatile memory 55. When there is access request information for the network, the network ID is registered in the area correspondence table 101 or is not registered in the area correspondence table 101, but is registered in the area correspondence table 101 in the remote control key correspondence table. It is clear that a network ID that has not been registered is registered. Therefore, in step S7, other network IDs that are not registered in the remote control key correspondence table are detected from the region correspondence table 101.

  When the region ID is input from the region ID acquisition unit 82, the region initialization unit 85 initializes and initializes the region of the nonvolatile memory 55 corresponding to the region ID from the region ID acquisition unit 82 in step S8. The area ID of the area is output to the network ID registration unit 84, and the process proceeds to step S10.

  On the other hand, if it is determined in step S4 that there is a free area in the area correspondence table 101, the area ID acquisition unit 82 proceeds to step S9 and acquires and acquires the area ID of the free area from the area correspondence table 101. The area ID of the empty area is output to the network ID registration unit 84, and the process proceeds to step S10.

  When the area ID of the empty area is input from the area ID acquisition unit 82 or the area initialization unit 85, the network ID registration unit 84 acquires the network ID in association with the input area ID of the empty area in step S10. The network ID from the unit 81 is registered in the region correspondence table 101, the region ID associated with the network ID is output to the memory access unit 86, and the process proceeds to step S12.

  If it is determined in step S3 that the network ID from the network ID acquisition unit 81 is registered in the region correspondence table 101, the region ID acquisition unit 82 proceeds to step S11, and from the region correspondence table 101, the network The area ID corresponding to the ID is acquired, the acquired area ID is output to the memory access unit 86, and the process proceeds to step S12.

  When the memory access unit 86 inputs the region ID from the region ID acquisition unit 82 or the network ID registration unit 84, in step S12, based on the access request information (write request information) of the data broadcast content, predetermined data is stored. Write to the area of the non-volatile memory 55 corresponding to the area ID from the area ID acquisition unit 82 or the network ID registration unit 84, and the memory access control process ends.

  On the other hand, if it is determined in step S1 that there is no access request information in the data broadcast content based on the file data from the section data acquisition unit 53, or in step S6, the network ID is registered in the remote control key correspondence table. If it is determined that the data has not been written, the area ID acquisition unit 82 ends the memory access control process without writing data in the nonvolatile memory 55.

  Next, another example of the memory access control process of FIG. 6 will be described with reference to the flowchart of FIG. In the example of FIG. 7, a case will be described in which the access request information of the data broadcast content is read request information.

  When the file data of the data broadcast content is input from the section data acquisition unit 53, the network ID acquisition unit 81 stores the data broadcast content in the nonvolatile memory 55 based on the file data from the section data acquisition unit 53 in step S31. When it is determined whether there is access request information (reading information) to the data broadcast, and it is determined that there is access request information in the data broadcast content, the process proceeds to step S32 and from the SI information of the file data from the section data acquisition unit 53 Then, the network ID for identifying the channel of the data broadcasting content being received is acquired, and the acquired network ID is output to the area ID acquisition unit 82 and the network ID registration unit 84, and the process proceeds to step S33.

  When the network ID is input from the network ID acquisition unit 81, the region ID acquisition unit 82 determines whether or not the network ID from the network ID acquisition unit 81 is registered in the region correspondence table 101 in step S33. When it is determined that the network ID is not registered in the area correspondence table 101, the data corresponding to the network ID is not written in the nonvolatile memory 55, so the memory access control process is terminated.

  If the area ID acquisition unit 82 determines in step S33 that the network ID from the network ID acquisition unit 81 is registered in the area correspondence table 101, the area ID acquisition unit 82 proceeds to step S34 and corresponds to the network ID from the area correspondence table 101. The area ID to be acquired is acquired, the acquired area ID is output to the memory access unit 86, and the process proceeds to step S35.

  When the area ID from the area ID acquisition unit 82 is input, the memory access unit 86 corresponds to the area ID from the area ID acquisition unit 82 based on the access request information (read request information) of the data broadcast content in step S35. The data written in the area of the nonvolatile memory 55 to be read is read, and the memory access control process is terminated.

  On the other hand, if it is determined in step S31 that there is no access request information in the data broadcast content, the network ID acquisition unit 81 ends the memory access control process.

  As described above, reading / writing (access) of data to / from the nonvolatile memory 55 is managed by the area correspondence table 101 and the remote control key correspondence table. Even for data broadcast contents of channels not registered in the table, data can be read from and written to the nonvolatile memory 55.

  Further, when the network ID of the data broadcasting content is registered in the remote control key correspondence table, if there is no free area in the area correspondence table 101, the area of the channel not registered in the remote control key correspondence table from the free area correspondence table 101 Since the ID is detected, the area of the nonvolatile memory 55 corresponding to the detected area ID is initialized and the area is used, the data broadcast content of the channel registered in the remote control key correspondence table is It is accepted preferentially and data can be written into the nonvolatile memory 55. Therefore, the video signal receiving apparatus 1 can be operated in accordance with the data broadcasting operation regulations for digital terrestrial television broadcasting.

  Next, the transition of the area correspondence table 101 in the access control process to the nonvolatile memory 55 executed as described above will be specifically described. At this time, the remote control key correspondence table is set as shown in FIG.

  FIG. 8 shows a configuration example of the remote control key correspondence table 121. In the example of FIG. 8, the remote control key correspondence table 121 includes a remote control key ID for identifying a direct selection key of the remote control 3, a service ID for identifying the type of service (channel) provided by a broadcast station with a network ID, and a broadcast A network ID for identifying the station is registered in association with each other. This remote control key correspondence table 121 is stored in the SI information database (DB) 52 when the video signal receiving apparatus 1 is shipped, installed, forced channel scan, or when the channel setting of the remote control 3 is changed. Generated based on stored information.

  In the remote control key correspondence table 121 in FIG. 8, the remote control key ID “1” is associated with the service ID “0x0400” and the network ID “0x7FE0”, and the remote control key ID “2” is the service ID “0x0408” and the network. The remote control key ID “3” is associated with the service ID “0x6038” and the network ID “0x7F77”, and the remote control key ID “4” is associated with the service ID “0x0410” and the network ID “0”. 0x7FE2 ”, the remote control key ID“ 5 ”is associated with the service ID“ 0x0428 ”and the network ID“ 0x7FE5 ”, and the remote control key ID“ 6 ”is the service ID“ 0x0418 ”and the network ID“ 0x7 ”. Associated with the E3 ".

  The remote control key ID “7” is associated with the service ID “0x0430” and the network ID “0x7FE6”, and the remote control key ID “8” is associated with the service ID “0x0420” and the network ID “0x7FE4”. The remote control key ID “9” is associated with the service ID “0x5C38” and the network ID “0x7F87”. The remote control key ID “10” and the remote control key ID “11” are not registered because the service ID and the network ID are not associated with each other. The remote control key ID “12” is associated with the service ID “0x0440” and the network ID “0x7FE8”.

  First, in the initial state of the video signal receiving apparatus 1, the nonvolatile memory 55 is in a state where no data is written in any area, and the area correspondence table 101 is described above with reference to the area correspondence table 101 of FIG. As described above, the network ID is not registered in any area ID. In such a state, when an access request is indicated to the nonvolatile memory 55 from the data broadcast content of the channel with the network ID “0x7FE0”, the area ID acquisition unit 82 is the uppermost part of the area correspondence table 101 in FIG. Since it is determined that the area ID “0” is a free area and the area ID “0” is output to the network ID registration unit 84, the network ID registration unit 84, as shown in FIG. The network ID “0x7FE0” is associated with the area ID “0” in the uppermost row of FIG. As a result, the memory access unit 86 causes the area of the nonvolatile memory 55 to correspond to the area ID “0” (area A in FIG. 5) based on the access request information from the data broadcast content of the channel having the network ID “0x7FE0”. ) Is written.

  As described above, when there is an empty area in the area correspondence table 101, any network ID is registered in the empty area of the area correspondence table 101, and the area of the nonvolatile memory 55 can be accessed. . That is, when there is an empty area in the area correspondence table 101, the area of the nonvolatile memory 55 is accessed even if the network ID of the data broadcast content requested for access is not registered in the remote control key correspondence table 121. Can do.

  As described above, as a result of reading / writing data from / to the nonvolatile memory 55 from a plurality of channels, in the area correspondence table 101, as shown in FIG. 10, a network ID corresponds to each area ID. Attached and registered.

  In the case of the example in FIG. 10, the network ID “0x7FE0” is associated with the area ID “0” as in FIG. 9. The area ID “1” is associated with the network ID “0x6FE0”, the area ID “2” is associated with the network ID “0x6FE1”, and the area ID “3” is associated with the network ID “0x6FE2”. The area ID “4” is associated with the network ID “0x6FE3”, and the area ID “5” is associated with the network ID “0x6FE4”. The area ID “6” is associated with the network ID “0x6FE5”, the area ID “7” is associated with the network ID “0x6FE6”, and the area ID “8” is associated with the network ID “0x6FE7”. ”, The area ID“ 9 ”is associated with the network ID“ 0x6FE8 ”, and the area ID“ 10 ”is associated with the network ID“ 0x6FE9 ”. The area ID “11” indicates that the network ID is associated with the unregistered “0”.

  Then, in the state of the area correspondence table 101 in FIG. 10, when there is an access request to the nonvolatile memory 55 from the data broadcast content of the network ID “0x7FE2” that is not registered in the area correspondence table 101, FIG. As shown in FIG. 11, the network ID “0x7FE2” is registered in the area ID “11”, which is an empty area in the ten area correspondence table 101, and the area of the nonvolatile memory 55 corresponding to the area ID “11” Data reading / writing to (region L in FIG. 5) is executed. As a result, each network ID is associated with all the area IDs of the area correspondence table 101, so that the area correspondence table 101 has no free area ID that is not associated with the network ID.

  At this time, a channel that is not registered in the area correspondence table 101 of FIG. 11 but has a network ID “0x7E77” registered in association with the remote control key ID “3” of the remote control key correspondence table 121 of FIG. When there is an access request to the nonvolatile memory 55, the area ID acquisition unit 82 is registered in the remote control key correspondence table 121 in FIG. 8 from the network IDs registered in the area correspondence table 101 in FIG. Detects network IDs that are not. In the area correspondence table 101 of FIG. 11, the network ID “0x6FE0” corresponding to the second area ID “1” from the top is not registered in the remote control key correspondence table 121.

  Therefore, the area ID acquisition unit 82 detects the network ID “0x6FE0”, acquires the area ID “1” corresponding to the network ID “0x6FE0”, and uses the acquired area ID “1” as the area initialization unit. Output to 85. The area initialization unit 85 initializes the area (area B in FIG. 5) of the nonvolatile memory 55 corresponding to the area ID “1”, and the network ID registration unit 84, as shown in FIG. In 101, the network ID “0x7E77” is registered in association with the area ID “1” corresponding to the initialized area B.

  Thus, even when there is no free area in the area correspondence table 101, the access request from the channel with the network ID “0x7E77” registered in the remote control key correspondence table 101 is preferentially accepted. 86, based on the access request information from the channel having the network ID “0x7E77” registered in the remote control key correspondence table 101, data is written to the area of the nonvolatile memory 55 corresponding to the area ID “1”. can do.

  In the above description, when detecting a network ID registered in the area correspondence table 101 in FIG. 11 that is not registered in the remote control key correspondence table 121 in FIG. The network ID “0x6FE0” of the second area ID “1” registered in the area correspondence table 101 is detected, but the network ID not registered in the remote control key correspondence table 121 is detected. If there is, any network ID may be detected in the area correspondence table 101. In this case, since data of an arbitrary network ID that is not registered in the remote control key correspondence table 121 is deleted from the area of the nonvolatile memory 55, items such as the presence / absence of a flag are provided in the area correspondence table 101. In this way, data from important channels may not be erased.

  As described above, in the area correspondence table 101, each area of the nonvolatile memory 55 is managed in association with the network ID of the channel, and the remote control key correspondence table 121 is also referred to. Broadcast stations registered in the key can use the nonvolatile memory preferentially. Further, a broadcasting station (channel) that is not registered in the direct selection key of the remote controller can be used if there is an empty area in the nonvolatile memory.

  As described above, for example, when the contents of the remote control key correspondence table 121 are completely rewritten due to the user's moving, or when there is an access from a channel with a new network ID, the non-volatile memory 55 is stored based on the region correspondence table 101. Since old contents are gradually deleted, or when only a part of the contents of the remote control key correspondence table 121 is rewritten, the areas are not sequentially registered in the remote control key correspondence table 121 based on the area correspondence table 101. Since initialization is performed, the area of the nonvolatile memory 55 corresponding to the channel that has not been changed in the remote control key correspondence table 121 is not affected, and the data so far is guaranteed.

  Similarly, when the setting of the network ID is changed, the area of the nonvolatile memory 55 is changed according to the user's intention (change of the direct selection key of the remote controller 3) or the change of the area.

  As described above, when the user moves or when the user changes the setting of the direct selection key of the remote controller 3 (that is, the setting of the remote control key correspondence table 121), the contents of the area correspondence table 101 (that is, the network ID). Is rewritten according to the moved location or the setting changed by the user. That is, when moving or changing the setting of the direct selection key on the remote control, it is not necessary to initialize the settings related to the non-volatile memory area and data broadcasting contents, and the non-volatile memory area should be used as it is. Can do.

  As described above, the non-volatile memory area accessed from the data broadcast content can be efficiently utilized in accordance with the data broadcasting operation regulations of terrestrial digital television broadcasting.

  In the above description, the video signal receiving device 1 incorporating the display 22 has been described. However, the video signal receiving device connected to an external television device may be used, or a set top box or the like may be used. You may be made to do.

  In the above description, the digital terrestrial television broadcast signal has been described. However, the present invention may be applied to a BS or CS digital signal.

  The series of processes described above can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a program storage medium in a general-purpose personal computer or the like.

  As shown in FIG. 1, a program storage medium that stores a program that is installed in a computer and can be executed by the computer is a magnetic disk (including a flexible disk), an optical disk (CD-ROM (Compact Disc-Read). Removable recording media (package media) such as Only Memory), DVD (Digital Versatile Disc), magneto-optical disc (including MD (Mini-Disc) (trademark)), or semiconductor memory, or programs temporarily It is configured by a ROM 12 or the like that is stored permanently or permanently.

  In the present specification, the steps shown in the flowcharts include not only processes performed in time series according to the order described, but also processes executed in parallel or individually even if not necessarily performed in time series. Is included.

It is a block diagram which shows the structural example of the video signal receiver of this invention. It is a functional block diagram which shows the function structural example of the video signal receiver of FIG. FIG. 3 is a functional block diagram illustrating a more detailed functional configuration example of a data broadcast control unit in FIG. 2. It is a figure which shows the structural example of the area | region correspondence table which the data broadcast control part of FIG. 2 has. FIG. 5 is a diagram for explaining a correspondence relationship between the area correspondence table in FIG. 4 and the area of the nonvolatile memory in FIG. 2. 3 is a flowchart illustrating a memory access control process of the video signal receiving device in FIG. 1. 6 is a flowchart for explaining another example of the memory access control process of the video signal receiving apparatus of FIG. 1. FIG. 3 is a diagram illustrating a configuration example of a remote control key correspondence table included in the channel selection control unit of FIG. 2. It is a figure which shows the other structural example of the area | region correspondence table | surface of FIG. It is a figure which shows the further another structural example of the area | region correspondence table | surface of FIG. It is a figure which shows the other structural example of the area | region correspondence table | surface of FIG. It is a figure which shows the further another structural example of the area | region correspondence table | surface of FIG.

Explanation of symbols

1 video signal receiving device, 11 CPU, 12 ROM, 13 RAM, 15 tuner, 17 demultiplexer, 19 OSD unit, 20 video signal processing unit, 22 display, 26 light receiving unit, 51 channel selection control unit, 52 SI information DB, 53 section data acquisition unit, 54 data broadcast control unit, 55 nonvolatile memory, 81 network ID acquisition unit, 82 area ID acquisition unit, 83 remote control key correspondence table acquisition unit, 84 network ID registration unit, 85 area initialization unit, 86 Memory access part, 101 area correspondence table, 121 remote control key correspondence table

Claims (6)

In a signal receiving device that receives a broadcast signal,
The data broadcast content of the received broadcast signal is stored in an area correspondence table indicating a correspondence relationship between a network ID for identifying a channel of data broadcast content included in the broadcast signal and an area ID for identifying an area of a nonvolatile memory. Corresponding area determination means for determining whether or not the network ID is registered,
When it is determined by the corresponding area determination means that the network ID is not registered in the area correspondence table, it is determined whether or not there is a free area ID that does not correspond to any network ID in the area correspondence table. Free space determination means;
An area table registration means for registering the network ID in the area correspondence table in association with the free area ID when the free area determination means determines that the free area ID exists in the area correspondence table; A signal receiving apparatus comprising: a writing unit that writes predetermined information of the data broadcast content into the non-volatile memory area of the free area ID associated with the network ID by a table registration unit. . When the free area determination means determines that the free area ID does not exist in the area correspondence table, a key ID for identifying a remote controller channel selection key for the user to instruct channel selection, and the network ID Corresponding key determination means for determining whether or not the network ID is registered in the key correspondence table indicating the correspondence relationship;
When it is determined by the corresponding key determination means that the network ID is registered in the key correspondence table, other networks that are not registered in the key correspondence table and registered in the area correspondence table Area detecting means for detecting an area ID corresponding to the ID;
Area initialization means for initializing an area of the nonvolatile memory of the area ID corresponding to the other network ID detected by the area detection means;
The area table registration means registers the network ID in the area correspondence table in association with the area ID of the area of the nonvolatile memory initialized by the initialization means. A signal receiving apparatus according to claim 1. When it is determined by the corresponding area determination means that the network ID is registered in the area correspondence table, the writing means transmits the data broadcast to the area of the nonvolatile memory of the area ID corresponding to the network ID. 2. The signal receiving apparatus according to claim 1, wherein predetermined information of content is written. In a signal receiving method for receiving a broadcast signal,
The data broadcast content of the received broadcast signal is stored in an area correspondence table indicating a correspondence relationship between a network ID for identifying a channel of data broadcast content included in the broadcast signal and an area ID for identifying an area of a nonvolatile memory. A corresponding region determining step for determining whether or not the network ID of the device is registered;
If it is determined by the processing of the corresponding area determination step that the network ID is not registered in the area correspondence table, whether or not there is a free area ID that does not correspond to any network ID in the area correspondence table. A free space determination step to determine;
A region table registration step of registering the network ID in the region correspondence table in association with the free region ID when it is determined by the processing of the free region determination step that the free region ID exists in the region correspondence table; ,
And a writing step of writing predetermined information of the data broadcast content into the non-volatile memory area of the free area ID associated with the network ID by the process of the area table registration step. Signal reception method. A recording medium on which a program for causing a computer to perform a process of receiving a broadcast signal is recorded,
The data broadcast content of the received broadcast signal is stored in an area correspondence table indicating a correspondence relationship between a network ID for identifying a channel of data broadcast content included in the broadcast signal and an area ID for identifying an area of a nonvolatile memory. A corresponding region determining step for determining whether or not the network ID of the device is registered;
If it is determined by the processing of the corresponding area determination step that the network ID is not registered in the area correspondence table, whether or not there is a free area ID that does not correspond to any network ID in the area correspondence table. A free space determination step to determine;
A region table registration step of registering the network ID in the region correspondence table in association with the free region ID when it is determined by the processing of the free region determination step that the free region ID exists in the region correspondence table; ,
And a writing step of writing predetermined information of the data broadcast content into the non-volatile memory area of the free area ID associated with the network ID by the process of the area table registration step. A recording medium on which a program to be recorded is recorded. A program for causing a computer to perform a process of receiving a broadcast signal,
The data broadcast content of the received broadcast signal is stored in an area correspondence table indicating a correspondence relationship between a network ID for identifying a channel of data broadcast content included in the broadcast signal and an area ID for identifying an area of a nonvolatile memory. A corresponding region determining step for determining whether or not the network ID of the device is registered;
If it is determined in the corresponding area determination step that the network ID is not registered in the area correspondence table, whether or not there is a free area ID that does not correspond to any network ID in the area correspondence table. A free space determination step to determine;
A region table registration step of registering the network ID in the region correspondence table in association with the free region ID when it is determined by the processing of the free region determination step that the free region ID exists in the region correspondence table; ,
And a writing step of writing predetermined information of the data broadcast content into the non-volatile memory area of the free area ID associated with the network ID by the process of the area table registration step. Program to do.

Images