JP4142156B2 - Digital broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital broadcast receiving apparatus, and more particularly to a receiving apparatus that receives and displays data such as digitally compressed video.
[0002]
[Prior art]
In recent years, digital broadcasting has been performed in which digitally-compressed moving images and audio are transmitted by a transmission unit such as a satellite or CATV.
Furthermore, a still image information providing service for transmitting a plurality of still images that are associated with each other in advance through digital broadcasting so that the user can view the necessary still images through interactive operation is considered. Yes.
An operation when using the still image information providing service will be described with reference to FIG.
FIG. 17 is a diagram illustrating an operation image for selecting a still image.
When the user selects “4. Weather forecast” while the “service menu” still image 11 is displayed, the “weather forecast” still image 12 is displayed.
Hereinafter, conventional techniques for providing this still image information providing service will be described with reference to FIGS. 17, 18, and 19.
FIG. 18 is a diagram showing an image of still image data transmitted by the digital broadcast transmitting apparatus side.
A digital broadcast transmitting apparatus repeatedly transmits a plurality of compressed still image data.
The figure shows a state in which the first of the 150 still image data 20 repeatedly transmitted is the “service menu” still image 11 and the seventh is the “weather forecast” still image 12.
[0003]
FIG. 19 is a block diagram showing a configuration of a conventional digital broadcast receiving apparatus 100.
A conventional digital broadcast receiving apparatus 100 is an apparatus that receives data sent from a digital broadcast transmitting apparatus and displays a still image according to a user's operation, and includes a tuner & demodulator 102, a transport decoder 103, A local memory 104, an MPEG decoder 105, a local memory 106, a CPU 109 that controls each unit in the apparatus according to a user's operation, and a main memory 110 are provided.
Here, the tuner & demodulator 102 receives the data 101 sent from the digital broadcast transmitting device side by channel selection such as selecting a satellite to receive, demodulates, and inputs it to the transport decoder 103 It is.
The transport decoder 103 separates and extracts a transport stream designated by the CPU 109 from the data received from the tuner & demodulator 102.
The transmitted data 101 is obtained by time-division multiplexing a large number of encoded streams called transport streams with relatively short fixed-length packets.
The stream type of the transport stream includes “video”, “audio”, “data”, and the like.
When the stream type is “video” or “audio”, the transport decoder 103 inputs the video and audio to the MPEG decoder 105, and the MPEG decoder 105 expands and displays the video and audio.
When the stream type is “data”, the transport decoder 103 stores this data in the local memory 104 attached to the transport decoder 103. The data stored in the local memory 104 can be accessed from the CPU 109.
[0004]
The conventional digital broadcast receiving apparatus 100 decompresses and displays still image data transmitted from the digital broadcast transmitting apparatus in the “video” stream type by the MPEG decoder 105. Still image data is displayed not only for all the still images sent, but only for one image according to the user's selection. That is, the CPU 109 controls the MPEG decoder 105 according to the user's selection, and stops the display at the timing when one target still image is displayed. Incidentally, if the CPU 109 does not perform special control, a plurality of still image data repeatedly sent is input to the MPEG decoder 105, and the MPEG decoder 105 repeatedly displays all the still images as a moving image. become.
A conventional digital broadcast transmission apparatus transmits a still image as a “video” stream type in order to cause the digital broadcast reception apparatus 100 to perform the above-described processing, and data indicating a relationship between the still images. It is transmitted as the “data” stream type.
Here, the data indicating the relationship between the still images indicates, for example, that the still image 11 of the “service menu” and the still image 12 of the “weather forecast” in FIG. 17 are related. There is an identifier for identifying each still image, and information indicating the relationship between the still images. Hereinafter, data indicating the relationship between the still images is referred to as still image related data.
Therefore, the transport decoder 103 of the digital broadcast receiving apparatus 100 stores the still image related data transmitted from the digital broadcast transmitting apparatus in the local memory 104, and the CPU 109 accesses the local memory 104 to access the still image related data. Data is stored in the main memory 110.
The transport decoder 103 of the digital broadcast receiving apparatus 100 inputs still image compressed data transmitted from the digital broadcast transmitting apparatus to the MPEG decoder 105 via the compressed data stream dedicated input port 107.
The MPEG decoder 105 decompresses the video and audio data stored in the local memory 106 and the serial / parallel conversion circuit 111 that converts the data signal input from the transport decoder 103 into an 8-bit parallel signal. And a display circuit 114 for displaying data stored in the local memory 106.
[0005]
Accordingly, the compressed still image data input to the MPEG decoder 105 is stored in the local memory 106, decompressed by the decompression circuit 113, stored again in the local memory 106, and displayed on the display circuit 114. Here, the display by the MPEG decoder 105 means outputting a TV output signal. The CPU 109 accepts the user's operation, refers to the still image related data stored in the main memory 110, acquires the identifier of the still image selected by the user's operation, and stores the identifier of the identifier in the MPEG decoder 105. Instructs to stop when the image data is displayed.
For example, when the still image 11 shown in FIG. 17 is displayed and the user selects “4. Weather forecast”, the CPU 109 sets the identifier of the still image corresponding to “4. In order to display the still image 12 obtained by referring to the storage 110, the MPEG decoder 105 is notified of the identifier and instructed to stop in a state where the still image 12 is displayed.
In response to this, the MPEG decoder 105 inspects the compressed data of the still image sent thereafter and stops the display with the still image 12 displayed.
In this way, the conventional digital broadcast receiving apparatus 100 allows a user to browse necessary still image information through an interactive operation.
[0006]
[Problems to be solved by the invention]
However, the conventional digital broadcast receiving apparatus has a problem that it takes a long time to display a still image selected by a user's operation.
For example, if 150 still image data is repeatedly transmitted from the digital broadcast transmitting device side, a maximum of 150 images from when the user selects until the selected still image is displayed. Takes time to send. If it takes 5 seconds to transmit 150 sheets, the user will wait 5 seconds.
Therefore, in view of the above, the present invention provides a digital broadcast receiving apparatus for realizing a still image information providing service with good response, that is, a digital broadcast receiving apparatus having a high probability of quickly displaying a still image selected by a user. The purpose is to provide.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a digital broadcast receiving apparatus according to the present invention receives a plurality of still image data repeatedly transmitted from a digital broadcast transmitting apparatus, and obtains a single still image designated by a user. A digital broadcast receiving apparatus for displaying, wherein storage means, receiving means for sequentially receiving a plurality of still image data, and predicting one or more still images specified by a user prior to the specification A prediction unit configured to perform, a still image capture unit configured to capture still image data of a still image predicted by the prediction unit among the plurality of still image data received by the reception unit into the storage unit, and a user Specification accepting means for accepting designation of a still image, and a user accepted by the designation accepting means among one or a plurality of still image data stored in the storage means Based on the still picture data for one still image according to the specified characterized by comprising a display means for displaying the still picture.
With the above configuration, when a plurality of still image data is transmitted from a digital broadcast transmitting device, the digital broadcast receiving device according to the present invention receives the plurality of still image data, and the plurality of still image data. One or more items that the user will select are predicted and stored in the storage means prior to the user's selection operation, so that the user can select a still image display instruction by the selection operation. The probability of quickly displaying the still image when the image is displayed is increased.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Embodiment 1>
Embodiment 1 of the digital broadcast receiving apparatus according to the present invention will be described below.
FIG. 1 is a block diagram showing a configuration of digital broadcast receiving apparatus 600 according to Embodiment 1 of the present invention.
The digital broadcast receiving device 600 is a device that receives digitally compressed data transmitted from a digital broadcast transmitting device and extracts necessary information to display a still image in response to a user's interactive operation. Yes, a tuner & demodulator 602, a transport decoder 603, a local memory 604 attached to the transport decoder 603, an MPEG decoder 605, a local memory 606 attached to the MPEG decoder 605, and a user operation A CPU 609 that controls each unit of the digital broadcast receiving apparatus and a main memory 610 accessed from the CPU 609 are provided.
Here, the main memory 610 stores various programs for controlling the CPU 609 to realize the functions of the digital broadcast receiving apparatus 600 as a whole, but can also store other various data.
[0009]
In addition, the CPU 609 can detect a user's operation performed via a remote controller or other input means. In this regard, a general household electrical appliance having a CPU accepts a user's operation and responds accordingly. This is the same as controlling each part.
The tuner & demodulator 602 selects and demodulates the transmitted data, receives the MPEG2 transport stream designated by the CPU 609, and outputs it to the transport decoder 603.
The data transmitted from the digital broadcast transmitting apparatus is an MPEG2 transport stream that is digitally compressed in accordance with the MPEG2 (Moving Picture Experts Group2) standard. This MPEG2 transport stream is multiplexed by a 188-byte fixed-length transport packet, and a plurality of transport streams such as video and audio are multiplexed.
The transport decoder 603 separates and extracts a specific transport stream from received data using a packet identifier (PID) as a filter condition under the control of the CPU 609.
That is, the CPU 609 designates filter conditions for the transport decoder 603 so that the transport decoder 603 extracts necessary data and stores it in the local memory 604, and then from the local memory 604 to the main memory 610. The necessary data is transferred.
[0010]
Here, data transmitted from a digital broadcast transmission apparatus conforms to ISO / IEC 13818-1 (hereinafter referred to as MPEG2 system standard), DVB-SI (Digital Video Broadcasting Service Information) standard, and the like. First, the CPU 609 determines that the PAT PID of the PAT (Program Association Table) of the currently received transponder (satellite repeater) is 0, so the transport decoder 603 Then, PAT is extracted by specifying the filter condition of PID = 0.
Since the PID of the PMT (Program Map Table) is written in the PAT, the CPU 609 subsequently acquires the PID of the PMT corresponding to the program to be used, designates it as a filter condition, and sends it to the transport decoder 603. The PMT is extracted and the PID of the necessary stream data such as “video”, “audio”, “data” is obtained with reference to the PMT, and “video”, “audio”, “data” are used as filter conditions. The necessary stream data of any of the types can be separated and extracted. Of the stream data, those stored as private sections of the MPEG2 standard are designated by using section IDs instead of the above-mentioned PIDs. Here, for simplicity of explanation, all of them are PIDs. It is assumed that it can be specified.
When the stream type of the transport stream is “video” or “audio”, the transport decoder 603 inputs the video and audio to the MPEG decoder 605, and the MPEG decoder 605 decompresses the video and audio. indicate. When the stream type is “data”, the transport decoder 603 stores this data in the local memory 604 attached to the transport decoder 603.
[0011]
The MPEG decoder 605 stores a CPU access port 608 that receives input from the CPU 609, a byte conversion circuit 612 that converts 32-bit parallel data input from the CPU access port 608 into four 8-bit parallel data, and a local memory 606. The decompression circuit 613 decompresses the compressed still image data and stores it again in the local memory 606, and the display circuit 614 displays a still image based on the still image data stored in the local memory 606.
Hereinafter, the operation of the digital broadcast receiving apparatus 600 having the above-described configuration will be described.
In the first embodiment, the digital broadcast transmitting apparatus repeatedly transmits compressed still image data corresponding to 150 still images (see FIG. 18). However, the digital broadcast transmission apparatus in the first embodiment transmits not only still image related data but also still image data as a “data” stream type, unlike the digital broadcast transmission apparatus in the above-described conventional technology. ing.
The tuner & demodulator 602 of the digital broadcast receiving apparatus 600 sequentially receives and demodulates repeatedly transmitted data, and inputs the data to the transport decoder 603.
In response to this, the transport decoder 603 stores, in the local memory 604, still image related data transmitted with the stream type “data” under the control of the CPU 609.
[0012]
The CPU 609 transfers the still image related data from the local memory 604 to the main memory 610 and refers to the still image related data, thereby transferring the necessary still image data as needed according to the user's operation to the transport decoder 603. It is extracted from the received data by control and stored in the main memory 610.
Since the digital broadcast receiving apparatus 600 displays the first still image among a plurality of transmitted still images immediately after being activated, the main memory 610 stores still image related data. The first still image data and other necessary still image data are stored.
Note that the CPU 609 predicts still image data that may be selected by the user and causes the transport decoder 603 to extract it. The predictive control operation of the CPU 609 will be described later.
Immediately after the digital broadcast receiving apparatus 600 is activated, the CPU 609 displays the first still image data from the main memory 610 in order to display the first still image among the plurality of transmitted still images. The data is taken out and input to the byte conversion circuit 612 via the CPU access port 608.
The MPEG decoder 605 decompresses the first still image data input to the byte conversion circuit 612 by the decompression circuit 613 using the local memory 606 and displays it on the display circuit 614.
[0013]
As a result, the still image 11 shown in FIG. 17 is displayed on the display device connected to the digital broadcast receiving device 600.
Thereafter, when a user's selection operation is performed to select “4. Weather forecast”, the CPU 609 accepts the user's operation, refers to the still image related data stored in the main memory 610, and The still picture data selected by the above operation is taken out from the main memory 610 and inputted to the byte conversion circuit 612 inside the MPEG decoder 605 via the CPU access port 608.
When the still image related data stored in the main memory 610 is such that when the user selects “4. Weather forecast” in the first still image, the seventh still image is displayed. The CPU 609 inputs the seventh still image data to the byte conversion circuit 612.
The MPEG decoder 605 stores the still image data input to the byte conversion circuit 612 in the local memory 606, expands it in the expansion circuit 613, stores it again in the local memory 606, and displays it on the display circuit 614.
Accordingly, the still image 12 of FIG. 17 is displayed on the display device connected to the digital broadcast receiving device 600.
[0014]
(Byte conversion circuit)
Hereinafter, the byte conversion circuit 612 will be described in detail.
FIG. 2 is a block diagram showing the internal configuration of the byte conversion circuit 612.
The byte conversion circuit 612 determines a 32-bit input buffer 702 for temporarily storing input data, a data selector 703 in units of 8 bits, data to be selected, and a counter 707 for sequentially sending out the data. Is configured by an output order determination register 705 that determines whether to proceed in ascending order or descending order.
The CPU 609 handles 4 bytes as one word, and can process the data at high speed by accessing the main memory 610 in units of 4 bytes. Data transfer to the byte conversion circuit 612 via the CPU access port 608 is possible. Is also performed in 32-bit parallel.
Further, the decompression circuit 613 that captures the data output from the byte conversion circuit 612 can capture parallel 8-bit data.
Input data 701 having a 32-bit width input from the CPU 609 via the CPU access port 608 is accumulated in the input buffer 702 and input to the data selector 703 in units of 8 bits.
[0015]
The input four 8-bit data are output as output data 709 in order from the most significant byte or the least significant byte. Whether to output from the most significant byte or from the least significant byte is determined by the value of the output order determination register 705.
The output order determination register 705 is for initial setting that operates when the digital broadcast receiving apparatus 600 is activated so that it is 0 when the CPU type is the big endian type and 1 when the CPU type is the little endian type. The program is set according to the CPU type.
If the CPU type is a big endian type, the value of the output order determination register 705 is 0, and the counter 707 advances counting in ascending order, and D (31:24), D (23:16), D (15: 8) ), D (7: 0). If the CPU type is a little endian type, the value of the output order determination register 705 is 1, and the counter 707 advances the count in descending order, and D (7: 0), D (15: 8), D (23:16) ), D (31:24) are sequentially output.
As described above, the byte conversion circuit 612 outputs the 4-byte data input by the CPU 609 to the local memory 606 one byte at a time. Therefore, the decompression circuit 613 simply changes the memory address from the local memory 606 byte by byte. Data can be captured continuously.
[0016]
(Predictive control operation)
Hereinafter, the above-described predictive control operation of the CPU 609, that is, a procedure in which the CPU 609 stores a plurality of still image data that may be selected by the user in the main memory 110 will be described in detail.
FIG. 3 is an image diagram showing a relationship between still images.
In a state where the first still image is displayed, the user performs selection operation to the digital broadcast receiving device 600 to the second, fourth, fifth, seventh, eleventh, .. Can be displayed in one of the still images.
In a state where the seventh still image is displayed, the user selects and operates one of the eighth, ninth, and first still images on the digital broadcast receiving device 600. Can be displayed.
Note that the first still image is special, and in any state where still images other than the first one are displayed, the first operation is performed by the user on the digital broadcast receiving device 600 by the selection operation. Still images can be displayed.
The still picture related data is repeatedly transmitted at a predetermined interval in a stream type of “data” from the transmission side of the digital broadcast. The digital broadcast receiving apparatus 600 separates and extracts the still image related data from the received data by the transport decoder 603 under the control of the CPU 609 once after activation, and stores it in the main memory 610 via the local memory 604. To do.
[0017]
The control of the CPU 609 is performed by a program stored in the main memory 610, and the CPU 609 uses the main memory 610 as a work area when executing the program.
The still image related data stored in the main memory 610 is hereinafter referred to as a still image information table.
FIG. 4 is a diagram showing the contents of the still image information table.
Each still image has an identification number, a parent still image identification number, a child still image identification number, and information about the size of the still image data.
Here, the parent means a still image displayed before displaying the still image, and the child means a still image displayed when a user performs a selection operation on the still image. And
Also, in the figure, the identification number value (N) indicates the Nth still image. Therefore, the figure shows that the parent of the second still image is, for example, the first still image.
FIG. 5 is a flowchart of a process of storing a plurality of still image data that may be selected by the user in the main memory 110.
Hereinafter, processing for storing still image data in the main memory 610 will be described in accordance with the processing steps of the flowchart of FIG.
After starting up the digital broadcast receiving apparatus 600, the CPU 609 first sets a variable M, which holds the identification number of the still image to be displayed, to 1 in order to display the first still image (step S51). Here, the identification number is a numerical value indicating the number of still image data.
[0018]
The CPU 609 refers to the still image information table for the first still image data, and array variable N = {2, 4, 5, 7 that holds the identification number of the still image that is a child of the first still image. , 11, 50} is obtained (step S52). This has the meaning of predicting a still image that may be selected by the user.
The CPU 609 checks whether or not the first still image data is stored in the main memory 610 (step S53), and if not, controls the transport decoder 603 to control the first still image data from the received data. Are extracted and stored in the local memory 604, and the first still image data is extracted from the local memory 604 and stored in the main memory 610 (step S54).
Subsequently, the CPU 609 retrieves the first still image data from the main memory 610 and inputs it to the byte conversion circuit 612 inside the MPEG decoder 605 via the CPU access port 608 (step S55). In response to this, the MPEG decoder 605 decompresses the first still image data input to the byte conversion circuit 612 by the decompression circuit 613 using the local memory 606 and displays it on the display circuit 614.
After the digital broadcast receiving apparatus 600 displays a still image, the CPU 609 determines whether or not the user has performed a selection operation (step S56). The user's operation can be performed at any time, and the CPU 609 determines whether or not such a user's operation has been performed in step S56.
[0019]
While the user has not yet performed the selection operation, the CPU 609 refers to the array variable N = {2, 4, 5, 7, 11, 50} and stores the second, fourth, fifth, seventh, It is determined whether there are all the 11th and 50th still image data (step S57). If there is still image data not yet stored in the main memory 610, the transport decoder 603 is controlled to determine one still image data from the received data. Still image data is extracted and stored in the local memory 604. The still image data is extracted from the local memory 604, stored in the main memory 610 (step S58), and the process returns to the determination in step S56.
Therefore, the CPU 609 tries to store the second, fourth, fifth, seventh, eleventh, and fiftyth still image data in the main memory 610 as much as possible until the user performs the selection operation.
When the user performs a selection operation (step S56), the CPU 609 refers to the still image information table, acquires the identification number of the still image to be displayed, and sets M = identification number (step S59). . Here, if the still image to be displayed next by the user's selection is the seventh still image, M = 7.
Next, the CPU 609 returns to the process of step S52, and obtains an array variable N = {8, 9} that holds the identification number of the still image that is a child of the seventh still image (step S52).
After obtaining the array variable N = {8, 9}, the CPU 609 determines whether the seventh still image data is already stored in the main memory 610 (step S53).
If the seventh still image data is not yet stored in the main memory 610, the seventh still image data is stored via the transport decoder 603 in the same manner as the above-described process for fetching the first still image data into the main memory 610. The th still image data is taken into the main memory 610 (step S54).
[0020]
If the user's selection operation for requesting display of the seventh still image is performed after a certain period of time since the display of the first still image, step S58 described above is performed. Thus, since the seventh still image data is already stored in the main memory 610, the CPU 609 executes step S55. That is, the CPU 609 inputs the seventh still image data to the MPEG decoder 605. Accordingly, the seventh still image is displayed.
Thereafter, the processing from step S52 to step S59 is repeated as long as the digital broadcast receiving apparatus 600 is operating.
In this way, the CPU 609 stores still image data that is a child of the still image in the main memory 610 in addition to the still image data that should be displayed by the user's selection operation. Processing for the next selection is performed.
If the user is selected again before all the still image data that is to be displayed is stored in the main memory 610, the CPU 609 further determines the next user. Take action to prepare for selection.
That is, when the user is selected, the previously predicted information is discarded instead of continuing the process of storing the still image data for the still image predicted in the previous step S52 in the main memory 610. That is, ignoring and starting a process of storing still image data for the still image newly predicted in step S52 in the main memory 610.
In this way, the CPU 609 performs a predictive control operation that predicts a plurality of still image data that may be selected by the user and stores them in the main memory 610 in advance.
[0021]
It should be noted that the first still image data is stored once in the main memory 610 so that it can be displayed immediately if the user selects the first still image from any still image display state. Other still image data that will not be erased thereafter is required if there is no free space when the still image data that has been newly stored needs to be stored in the area used for storing the still image in the main memory 610. It is erased accordingly. As for this erasing, those that are not likely to be selected in the next operation as a result of the user's selection operation are preferentially erased.
As described above, the digital broadcast receiving apparatus 600 according to the present invention limits the size of an area that can be used for storing still images in the main memory 610 by performing an operation in preparation for the user's next selection. It is possible to provide a still image information providing service with good response even when
[0022]
<Embodiment 2>
A second embodiment of the present invention in which a digital broadcast receiving apparatus according to the present invention displays a still image using the graphics display function of an MPEG decoder will be described below with reference to FIGS.
One of the functions of the conventional MPEG decoder 105 is a function of outputting graphics display data directly stored in the local memory 106 to a TV. Hereinafter, it is referred to as a graphics display function. If the graphics to be displayed by the CPU 109 is created as data corresponding to the pixel and stored in the local memory 106, the output is TV output by the MPEG decoder 105 using the display circuit 114 (see FIG. 19).
The second embodiment is a modification of the digital broadcast receiving device 600 according to the first embodiment, and the processing steps until the still image data stored in the main memory 610 is displayed are different.
That is, in the second embodiment, the digital broadcast receiving apparatus 600 stores a program for expanding compressed still image data in the main memory 610 (see FIG. 1). Unlike still image data stored in 610 being expanded and displayed by the expansion circuit 613 of the MPEG decoder 605, in the second embodiment, still image data stored in the main memory 610 is separately stored in the main memory 610. The stored program is decompressed by execution by the CPU 609 to be displayable pixel data, stored in the local memory 606, and displayed by the graphics display function of the MPEG decoder 605 (see FIG. 1).
Since the second embodiment is the same as the first embodiment in other points, the other description is omitted. A technique for decompressing compressed still image data by software is a conventional technique.
[0023]
<Embodiment 3>
Hereinafter, Embodiment 3 of the present invention will be described with reference to FIGS.
The digital broadcast receiving apparatus according to Embodiment 3 uses the graphics display function of the MPEG decoder, and further uses the function of expanding and displaying the video data of the MPEG decoder to superimpose still images and other videos. indicate.
Conventionally, the MPEG decoder 105 has a function of displaying pixel data stored in the local memory 106 in graphics, and a function of expanding and displaying compressed video and audio data stored in the local memory 106 by the expansion circuit 113. Hold it together (see FIG. 19).
Hereinafter, both the pixel image data generated by the CPU based on the graphic display data and the still image pixel image data obtained by decompressing the compressed still image data by the CPU by the program are referred to as graphic data.
[0024]
FIG. 6 is a block diagram showing a configuration of digital broadcast receiving apparatus 1600 according to Embodiment 3.
The digital broadcast receiving apparatus 1600 includes a tuner & demodulator 1602 that selects and demodulates transmitted data, and a transport decoder 1603 that separates packets such as “video”, “audio”, and “data” from the transport stream. A local memory 1604 attached to the transport decoder 1603, an MPEG decoder 1605, a local memory 1606 attached to the MPEG decoder 1605, a CPU 1609 for central control of the digital broadcast receiving apparatus, and a main memory 1610 accessed from the CPU 1609. Is provided.
The main memory 1610 stores various programs for controlling the CPU 1609 to realize the functions of the entire digital broadcast receiving apparatus 1600, but can also store other various data.
Data 1601 transmitted from the transmission apparatus side is selected and demodulated by a tuner & demodulator 1602 and input to a transport decoder 1603. The data to be transmitted is obtained by time-division multiplexing a large number of encoded streams called transport streams with relatively short fixed-length packets.
The transport decoder 1603 separates and extracts a specific transport stream from received data using a packet identifier (PID) as a filter condition under the control of the CPU 1609.
That is, the CPU 1609 designates filter conditions to the transport decoder 1603 to extract necessary data from the transport decoder 1603 and store it in the local memory 1604, and then from the local memory 1604 to the main memory 1610. The necessary data is transferred.
[0025]
Here, assuming that the data transmitted from the digital broadcast transmission apparatus conforms to the MPEG2 system standard, DVB-SI standard, etc., the CPU 1609 specifies the filter condition in the transport decoder 1603. , PAT of PID defined in advance is extracted, PID of PMT is obtained by referring to PAT, PMT is extracted by specifying this as a filter condition, and necessary “video” is obtained by referring to PMT, Obtaining PID of stream data such as “audio”, “data”, etc., and using this as a filter condition, the necessary stream data of any type of “video”, “audio”, “data” can be separated and extracted it can.
When the stream type of the transport stream is “video” or “audio”, the transport decoder 1603 inputs the video and audio to the MPEG decoder 1605, and the MPEG decoder 1605 decompresses the video and audio. indicate. If the stream type is “data”, the transport decoder 1603 stores this data in the local memory 1604 attached to the transport decoder 1603.
Data stored in the local memory 1604 can be accessed from the CPU 1609.
[0026]
In the third embodiment, the digital broadcast transmitting apparatus transmits moving images and sounds such as TV programs, graphics display data such as program guides, and 150 still image data.
150 still image data are repeatedly transmitted. Here, the moving image is transmitted in the “video” stream type, the audio is transmitted in the “audio” stream type, and the graphics display data and the still image data are transmitted in the “data” stream type.
The tuner & demodulator 1602 of the digital broadcast receiving apparatus 1600 sequentially receives and demodulates repeatedly transmitted data and inputs the data to the transport decoder 1603.
In response, the transport decoder 1603 stores, in the local memory 1604, still image related data transmitted with the stream type “data” under the control of the CPU 1609.
The CPU 1609 transfers the still image related data from the local memory 1604 to the main memory 1610, and refers to the still image related data, thereby transferring the necessary still image data as needed according to the user's operation to the transport decoder 1603. It is extracted from received data by control and stored in the main memory 1610.
Since the digital broadcast receiving apparatus 1600 displays the first still image among a plurality of transmitted still images immediately after being activated, the main memory 1610 stores still image related data. The first still image data and other necessary still image data are stored.
[0027]
Note that the CPU 1609 predicts still image data that can be selected by the user and causes the transport decoder 1603 to extract the prediction data. The predictive control operation of the CPU 1609 is the predictive control of the CPU 609 in the first embodiment. The operation is the same.
The MPEG decoder 1605 also decompresses the compressed video and audio data stored in the local memory 1606 and stores the decompressed data in the local memory 1606 again, the video and audio decompressed by the decompression circuit 1613, and the local memory. A display circuit 1614 that superimposes and displays graphics display data directly stored in 1606, a stream input port 1607 that receives input of a transport decoder of compressed video and audio data, and a stream input port 1607 A serial / parallel conversion circuit 1611 that converts serial data into 8-bit parallel data, a CPU access port 1608 that receives graphic data from the CPU 1609, and 32-bit data input from the CPU access port A byte conversion circuit 1612 for converting the data into four 8-bit data, and an arbitration circuit 1615 for transferring video and audio data sent from the serial / parallel conversion circuit 1611 and graphic data sent from the byte conversion circuit 1612 to the local memory 1606. have.
Immediately after the digital broadcast receiving apparatus 1600 is activated, the CPU 1609 displays the first still image data from the main memory 1610 in order to display the first still image among the plurality of transmitted still images. Then, the graphic data to be decompressed and displayed under the control of a program separately stored in the main memory 1610 is generated and input to the arbitration circuit 1615 via the CPU access port 1608 and the byte conversion circuit 1612.
[0028]
Also, video and audio data sent from the digital broadcast transmitting apparatus side is extracted by the transport decoder 1603 under the control of the CPU 1609 and arbitrated via the stream input port 1607 and the serial / parallel conversion circuit 1611. Input to the circuit 1615.
The arbitration circuit 1615 stores in the local memory 1606 graphic data sent from different paths and compressed video and audio data. The video and audio data stored in the local memory 1606 is expanded by the expansion circuit 1613 and stored in the local memory 1606 again.
The display circuit 1614 superimposes and displays the decompressed video stored in the local memory 1606 and the graphic data of the still image stored in the local memory 1606.
Thereafter, even when the display of the seventh still image is required by the user's operation, the digital broadcast receiving apparatus 1600 displays the video and the image as in the case of the display of the first still image. The graphic data of the still image is superimposed and displayed.
As described above, the digital broadcast receiving apparatus according to the present invention can also superimpose and display the video and the still image.
[0029]
<Embodiment 4>
Embodiment 4 of the digital broadcast receiving apparatus according to the present invention will be described below.
In the above-described third embodiment, the still image is displayed using the graphics display function of the MPEG decoder.
The graphics display function of the MPEG decoder is also used to display graphics display data such as a program table sent from the digital broadcast transmitting apparatus side. The graphics display data is data having elements such as graphic types, display coordinates, and sizes for displaying characters, lines, and other graphics. The CPU 1609 stores graphics display data in the main memory 1610 via the transport decoder 1603 and the local memory 1604, and generates graphic data that is a pixel image based on the graphics display data.
In the fourth embodiment, the digital broadcast receiving apparatus according to the present invention receives the graphics display data of the program guide, the video and audio data, and displays the graphics and the video in a superimposed manner. Let's take an example. The other points are the same as in the third embodiment. In particular, the arbitration circuit 1615, which has not been described in detail in the third embodiment, will be described in detail by comparing it with a normally considered arbitration circuit.
The video and audio expanded by the expansion circuit 1613 and the graphics generated by the CPU 1609 are overlapped by the display circuit 1614 and output as a TV output signal (see FIG. 6).
[0030]
FIG. 7 is a diagram showing a display surface on which video and graphics are displayed overlapping each other.
A program guide graphic 1002 is displayed on the display surface 1001, and a TV program moving image 1003 is displayed in the background of the program guide graphic 1002. Although not shown in the figure, sound is also reproduced while this display surface is displayed.
In this way, in order to display video and graphics superimposed and reproduce audio, video and audio data and graphic data must each be stored in the local memory 1606 once. Note that video and audio data and graphic data are stored in the local memory 1606 through different paths.
The arbitration circuit 1615 performs data transfer control in order to arbitrate data from the above two paths and store the data in the local memory 1606 via one bus.
[0031]
(Normal arbitration circuit)
Here, a conceivable arbitration circuit will be described with reference to FIGS.
FIG. 8 is a functional block diagram of an arbitration circuit 1700 that is normally considered.
Video and audio data are intermittently sent to the arbitration circuit 1700 which can be considered normally at a predetermined transfer rate. Further, graphics data is intermittently sent to the arbitration circuit 1700.
In the following description, video and audio are transferred to A, video and audio data are transferred to the local memory attached to the MPEG decoder, A are transferred, graphics are transferred to B, and graphic data are transferred to the local memory attached to the MPEG decoder. Is called B transfer.
The arbitration circuit 1700 includes a transfer counter 1710 that counts the number of transfer clocks during A or B transfer, an A transfer control unit 1702 that controls execution of A transfer, and a B transfer that controls execution of B transfer. The controller 1706 checks whether transfer is possible, and if transfer is possible, the transfer right check unit 1701 that instructs A to transfer to the A transfer controller 1702, and whether transfer B can be checked and transferred. B transfer right check unit 1705 for instructing transfer to B transfer control unit 1706, A transfer right holding unit 1704 holding A transfer right, and B transfer right holding unit holding B transfer right One of the transfer right holding unit 1704, the transfer right holding unit 1704, and the transfer right holding unit 1708 of B is set to a value indicating that the transfer right exists, and the other is set to a value indicating that no transfer right exists. A transmission right setting unit 1709, an A transfer request holding unit 1703 that holds a transfer right request from the A transfer right check unit 1701, and a B right that holds a transfer right request from the B transfer right check unit 1705. A transfer request holding unit 1707.
[0032]
The transfer counter 1710 is set to a value obtained by subtracting 1 from the number of clocks per processing unit when transfer is started by the transfer control unit 1702 of A or the transfer control unit 1706 of B, and is decremented by 1 every clock. Assuming that one processing unit of A transfer and B transfer is 2 clocks, the transfer counter is set to 1 when the transfer starts to be executed.
Here, since the video and audio data must be transferred at a certain transfer rate, the transfer of A should not be performed after the transfer of B is completed. For this reason, the A transfer and the B transfer are each divided into fixed processing units and processed for each processing unit. When a transfer request is generated at the same time, the transfer is alternately performed for each fixed processing unit transfer. .
FIG. 9 is a flowchart showing a processing flow of the transfer right setting unit 1709 in the normal arbitration circuit 1700.
This flow loops once per clock.
A-REQ in the flow is a signal indicating that a transfer request for A has been issued, B-REQ is a signal indicating that a transfer request for B has been issued, and A-ACK is transferred to A B-ACK is a signal indicating that there is a right, and B-ACK is a signal indicating that B has the right to transfer.
If the transfer counter 1710 is 0 and an A transfer request is issued to the A transfer request holding unit 1703, a value indicating that the transfer right holding unit 1704 has the transfer right is set (step S1801, S1802, S1805).
If the transfer counter 1710 is 0, no A transfer request is issued to the A transfer request holding unit 1703, and B transfer request is issued to the B transfer request holding unit 1707, B A value indicating that there is a transfer right is set in the transfer right holding unit 1708 (steps S1801, S1802, S1803, and S1806).
In cases other than the above two cases, the values of the A transfer right holding unit 1704 and the B transfer right holding unit 1708 are maintained (steps S1801, S1804, S1807, S1808).
[0033]
FIG. 10 is a flowchart showing a processing flow of the A transfer right check unit 1701 in the arbitration circuit 1700 which can be considered normally.
This flow also loops once per clock.
If there is data to be transferred and there is no value indicating that transfer right exists in A's transfer right holding unit 1704, a value indicating that there is a transfer request is set in A's transfer request holding unit 1703 (step S1901). , S1902, S1903).
Further, there is data to be transferred, the A transfer right holding unit 1704 has a value indicating that the transfer right exists, the transfer counter 1710 is 0, and the B transfer request holding unit 1707 has a transfer request. If there is no such value, the transfer counter 1710 is set to a value obtained by subtracting 1 from the number of clocks 2 in one processing unit, that is, 1 and the A transfer control unit 1702 is controlled to start the A transfer ( Steps S1901, S1902, S1904, S1905, S1906, S1907).
Note that the processing flow of the transfer right check unit 1705 for B is the same as that shown in FIG.
The processing timing of A transfer and B transfer in the normal arbitration circuit 1700 having the above-described configuration and processing flow will be described below.
[0034]
FIG. 11 is a processing timing chart of the arbitration circuit 1700 that is normally considered.
Regardless of whether the transfer of A is performed fast or late, the transfer request of A is generated intermittently. If the transfer of A is performed late, that is, if it takes a long time from the transfer request to the completion of transfer after waiting by the arbitration circuit, the data of A may be discarded. Even if the video data is somewhat discarded, the display image is only slightly degraded.
On the other hand, since the graphic data is not sent from the outside but is generated by the CPU 1609, the CPU 1609 can make a request for the next B transfer as soon as the B transfer is completed. Therefore, if the B transfer is performed fast, the next B transfer request is generated quickly, and if the B transfer is performed late, the next B transfer request is generated late. Further, the data B is not discarded.
Since B1 occurs at t1 and B has already obtained the transfer right (B-ACK), the transfer process of B1 is performed with two clocks t2 and t3.
Since A1 occurs at t3 and A has not obtained the transfer right (A-ACK), a transfer request (A-REQ) is issued at t4.
Since the counter is 0 at t4, the transfer right (A-ACK) is given to A at t5 in response to the transfer request (A-REQ) of A.
Since A has acquired the transfer right (A-ACK) at t5, the transfer process of A1 is performed with two clocks at t6 and t7.
B2 occurs at t8, five clocks after the completion of transfer of B1 (t3), and B does not obtain the transfer right (B-ACK), so a transfer request (B-REQ) is issued at t9.
[0035]
Since the counter is 0 at t9, the transfer right (B-ACK) is given to B at t10 in response to the transfer request (B-REQ) of B.
Since B obtains the transfer right (B-ACK) at t10, the transfer process of B2 is performed with two clocks t11 and t12.
Similarly, A2 generated at t9 is transferred with two clocks t14 and t15, and A3 generated at t15 is transferred with two clocks t16 and t17.
B3 occurs at t16, four clocks after the completion of transfer of B2 (t12), but B3 transfer processing is not performed until t17.
As described above, in the normal arbitration circuit 1700, since the transfer right exists in A after the transfer of A is performed, if the transfer of B needs to be performed at this time, the transfer of B is performed. After issuing the request, the transfer right is acquired at least one clock later, and B can finally be transferred.
That is, in the normally considered arbitration circuit, when transfer of one processing unit of either A or B is completed, the transfer side of A and B holds the right to transfer next, and the current transfer right The side that does not hold the request can transfer only after receiving a permission at least one clock after issuing the transfer request.
[0036]
However, in the normally considered arbitration circuit, since the transfer of A and the transfer of B are processed equally, the graphic of the program guide is displayed rather than the background video 1003 as in the case of displaying the display surface 1001 shown in FIG. When the process 1002 is important, that is, when it is necessary to preferentially process the B transfer request over the A transfer request, there is a problem that a normal arbitration circuit is not sufficient.
In other words, video and audio change with time, and even if some data is lost, the previous data can be displayed, so even if transfer of A is delayed, the next data is transmitted. When the data arrives from the apparatus side, it is possible to discard the previous data and issue a transfer request for A for the next data, but the graphics data is not allowed to be lost.
[0037]
(Arbitration circuit in the digital broadcast receiving apparatus according to the present invention)
The arbitration circuit in the digital broadcast receiving apparatus according to the present invention improves the above-described normally-considered arbitration circuit, and can preferentially process a transfer request on the higher importance side.
Hereinafter, an arbitration circuit in the digital broadcast receiving apparatus according to Embodiment 4 will be described with reference to FIGS.
The arbitration circuit 1615 accepts two systems of data: video and audio data input from the serial / parallel conversion circuit 1611 and graphics data input by the CPU 1609, and local memory 1606 while arbitrating these data. It realizes the function to transfer to.
Note that the above-described two systems of data are both input to the arbitration circuit 1615 with the storage destination address in the local memory 1606.
The video and audio data that need to be decompressed must be stored in the first area in the local memory 1606, and this first area is accessed from the decompression circuit 1613. Further, graphics data to be directly displayed by the display circuit 1614 needs to be stored in the second area in the local memory 1606, and this second area is accessed from the display circuit 1614. Will be.
Accordingly, the arbitration circuit 1615 determines which of the two systems of data is input by referring to the input storage destination address, arbitrates these, and transfers data.
[0038]
FIG. 12 is a functional block diagram of the arbitration circuit 1615 according to the present invention.
Video and audio data are intermittently sent to the arbitration circuit 1615 at a predetermined transfer rate. Further, graphics data is intermittently sent to the arbitration circuit 1615.
In the following description, video and audio are referred to as A, transfer of video and audio data to the local memory 1606 is referred to as A, graphics is referred to as B, and graphic data is transferred to the local memory 1606 as B transfer.
The arbitration circuit 1615 includes a transfer counter 2710 that counts the number of transfer clocks during A or B transfer, an A transfer control unit 2702 that controls execution of A transfer, and B transfer that controls execution of B transfer. The controller 2706 checks whether transfer is possible, and if transfer is possible, the transfer right check unit 2701 of A instructs the transfer control unit 2702 of A to transfer, and checks whether transfer of B is possible. B transfer right check unit 2705 for instructing transfer to B transfer control unit 2706, A transfer right holding unit 2704 for holding A transfer right, and B transfer right holding unit for holding B transfer right 2708, the transfer right holding unit 2704 of A, and the transfer right holding unit 2708 of B are set to a value indicating that the transfer right exists, and the other is set to a value indicating that no transfer right exists. A transfer right setting unit 2709, an A transfer request holding unit 2703 that holds a transfer right request from the A transfer right check unit 2701, and a B transfer right request from the B transfer right check unit 2705 A transfer request holding unit 2707 and a priority holding unit 2711 that holds a value indicating which one of A and B is preferentially processed.
[0039]
The transfer counter 2710 is set to a value obtained by subtracting 1 from the number of clocks in one processing unit when transfer starts to be executed by the transfer control unit 2702 of A or the transfer control unit 2706 of B, and 1 is subtracted every clock. . Assuming that one processing unit of A transfer and B transfer is 2 clocks, the transfer counter is set to 1 when the transfer starts to be executed.
Here, since the video and audio data must be transferred at a certain transfer rate, the transfer of A should not be performed after the transfer of B is completed. For this reason, the A transfer and the B transfer are each divided into fixed processing units and processed for each processing unit. When a transfer request is generated at the same time, the transfer is alternately performed for each fixed processing unit transfer. .
FIG. 13 is a flowchart showing a processing flow of the transfer right setting unit 2709 in the arbitration circuit 1615.
This flow loops once per clock.
[0040]
A-REQ in the flow is a signal indicating that a transfer request for A has been issued, B-REQ is a signal indicating that a transfer request for B has been issued, and A-ACK is transferred to A B-ACK is a signal indicating that there is a right, and B-ACK is a signal indicating that B has the right to transfer.
If the transfer counter 2710 is not 0, the values of the A transfer right holding unit 2704 and the B transfer right holding unit 2708 are maintained (steps S2801, S2802, S2803, and S2804).
If the transfer counter 2710 is 0, the value of the priority holding unit 2711 indicates that A has priority, and A transfer request is issued to the A transfer request holding unit 2703, A Is set to the transfer right holding unit 2704 (steps S2801, S2805, S2806, S2808).
The transfer counter 2710 is 0, the value of the priority holding unit 2711 indicates that A has priority, the A transfer request is not issued to the A transfer request holding unit 2703, and If a B transfer request is issued to the B transfer request holding unit 2707, a value indicating that the B transfer right holding unit 2708 has the transfer right is set (steps S2801, S2805, S2806, S2807, S2809).
[0041]
The transfer counter 2710 is 0, the value of the priority holding unit 2711 indicates that A has priority, the A transfer request is not issued to the A transfer request holding unit 2703, and If no B transfer request is issued to the B transfer request holding unit 2707, a value indicating that the transfer right holding unit 2704 has the transfer right is set (steps S2801, S2805, S2806, S2807, S2808).
If the transfer counter 2710 is 0, the value of the priority holding unit 2711 indicates that A has no priority, and a B transfer request is issued to the B transfer request holding unit 2707, B Is set to the transfer right holding unit 2708 (steps S2801, S2805, S2810, and S2812).
The transfer counter 2710 is 0, the value of the priority holding unit 2711 indicates that A has no priority, the B transfer request holding unit 2707 has not issued a B transfer request, and If the A transfer request is issued to the A transfer request holding unit 2703, a value indicating that the A transfer right holding unit 2704 has the transfer right is set (steps S2801, S2805, S2810, S2811, and S2813).
The transfer counter 2710 is 0, the value of the priority holding unit 2711 indicates that A has no priority, the B transfer request holding unit 2707 has not issued a B transfer request, and If the A transfer request is not issued to the A transfer request holding unit 2703, a value indicating that the B transfer right holding unit 2708 has the transfer right is set (steps S2801, S2805, S2810, S2811, and S2812).
[0042]
FIG. 14 is a flowchart showing a processing flow of the transfer right check unit 2701 of A in the arbitration circuit 1615.
This flow also loops once per clock.
If there is data to be transferred and there is no value indicating that transfer right exists in A's transfer right holding unit 2704, a value indicating that there is a transfer request is set in A's transfer request holding unit 2703 (step S2901). , S2902, S2903).
When there is data to be transferred, the transfer right holding unit 2704 of A has a value indicating that the transfer right exists, and the priority holding unit 2711 indicates a value indicating that A does not have the priority , A transfer request holding unit 2703 is set to a value indicating that there is a transfer request (steps S2901, S2902, S2904, S2905).
There is data to be transferred, the A transfer right holding unit 2704 has a value indicating that the transfer right exists, and the priority holding unit 2711 indicates a value indicating that A has priority, and If the transfer counter 2710 is 0 and there is no value indicating that there is a transfer request in the B transfer request holding unit 2707, the transfer counter 2710 is set to a value obtained by subtracting 1 from the number of clocks of 1 processing unit, that is, 1. Then, the A transfer control unit 2702 is controlled to start the A transfer (steps S2901, S2902, S2904, S2906, S2907, S2908, S2909).
[0043]
Note that the processing flow of the transfer right check unit 2705 for B is the same as that shown in FIG.
The processing timing of A transfer and B transfer in the arbitration circuit 1615 having the above-described configuration and processing flow will be described below.
FIG. 15 is a processing timing diagram of the arbitration circuit 1615.
Here, a case where B has priority is shown.
Regardless of whether the transfer of A is performed fast or late, the transfer request of A is generated intermittently. If the transfer of A is performed late, that is, if it takes a long time from the transfer request to the completion of transfer after waiting by the arbitration circuit, the data of A may be discarded. Even if the video data is somewhat discarded, the display image is only slightly degraded.
On the other hand, since the graphic data is generated by the CPU, if the B transfer is performed quickly, the next B transfer request is generated quickly, and if the B transfer is performed slowly, the next B Transfer requests occur late. Further, the data B is not discarded.
[0044]
Since B1 occurs at t1 and B has already obtained the transfer right (B-ACK), the transfer process of B1 is performed with two clocks t2 and t3.
Since A1 occurs at t3 and A has not obtained the transfer right (A-ACK), a transfer request (A-REQ) is issued at t4.
Since the counter is 0 at t4, the transfer right (A-ACK) is given to A at t5 in response to the transfer request (A-REQ) of A.
Since A has acquired the transfer right (A-ACK) at t5, the transfer process of A1 is performed with two clocks at t6 and t7.
At t7, the counter is 0, and both A and B have not issued transfer requests (A-REQ, B-REQ), so at t8, B who has priority has transfer right (B-ACK). .
Since B2 is generated at t8 five clocks after the completion of transfer of B1 (t3) and B has acquired the transfer right (B-ACK), the transfer process of B2 is performed with two clocks of t9 and t10.
Similarly, A2 generated at t9 is transferred at two clocks t12 and t13, and B3 generated at t14 four clocks after the completion of B2 transfer (t10) is transferred at two clocks t15 and t16. Is done.
[0045]
Therefore, the transfer processing of B1, B2, and B3 by the arbitration circuit 1615 is completed by t16, and the transfer processing of B1, B2, and B3 by the normal arbitration circuit 1700 is not completed by t17.
As described above, in the arbitration circuit 1615, even after the transfer of A is performed, the transfer right is transferred to B having priority, so if a transfer of B is necessary at this time, a transfer request for B is issued. Therefore, as compared with the normal arbitration circuit 1700, the time from the transfer request of B to the transfer right being granted to B can be shortened.
According to the arbitration circuit 1615, still image graphic data and compressed video data such as moving images can be transferred to the local memory 1606 with priority given to still images, and moving images are added to the background of still images. Even when they are displayed in a superimposed manner, still images can be preferentially displayed. That is, even when the still image and the video are overlapped and displayed as shown in the third embodiment, the still image can be displayed at high speed.
[0046]
<Embodiment 5>
Embodiment 5 of the digital broadcast receiving apparatus according to the present invention will be described below.
FIG. 16 is a block diagram showing a configuration of digital broadcast receiving apparatus 3600 according to Embodiment 5. In FIG.
A digital broadcast receiving apparatus 3600 according to the fifth embodiment is a modification of the digital broadcast receiving apparatus 1600 according to the third and fourth embodiments, and includes a tuner and demodulator 1602 that selects and demodulates transmitted data, a transformer Central control of a transport decoder 3603 that separates packets such as “video”, “audio”, and “data” from the port stream, an MPEG decoder 1605, a local memory 1606 attached to the MPEG decoder 1605, and a digital broadcast receiver. A CPU 1609 that controls the main memory 3610 that is accessed from the CPU 1609 is provided.
In the figure, the same parts are denoted by the same reference numerals in the digital broadcast receiving apparatus 3600 and the digital broadcast receiving apparatus 1600 (see FIG. 6).
The digital broadcast receiving apparatus 3600 is significantly different from the digital broadcast receiving apparatus 1600 according to Embodiments 3 and 4 in that the local memory 604 is not provided, and an equivalent function can be realized without the local memory 604. The main memory 3610 stores a program to be executed by the CPU 1609, and the transport decoder 3603 extracts necessary data from the data input from the tuner & demodulator 1602 under the control of the CPU 1609, and A function of storing in the storage 3610 is provided.
[0047]
Hereinafter, a procedure until the digital broadcast receiving apparatus 3600 according to Embodiment 5 stores the received still image data in the main memory 3610 will be described.
Immediately after the digital broadcast receiving apparatus 3600 is activated, the CPU 1609 notifies the transport decoder 3603 of the address of a certain area in the main memory 3610.
Thereafter, the digital broadcast receiving apparatus 3600 receives and demodulates data repeatedly transmitted from the digital broadcast transmitting apparatus by the tuner & demodulator 1602 and sequentially inputs the data to the transport decoder 3603.
Under the control of the CPU 1609, the transport decoder 3603 extracts necessary still image data from the input data by identifying it with the PID, and uses the address previously notified from the CPU 1609 to specify in the main memory 3610. The still image data is transferred to the area. Note that the transport decoder 3603 is equivalent to the transport decoder 1603 in Embodiments 3 and 4 in terms of the function of extracting specific data designated by the CPU 1609 from the input data.
In this way, the digital broadcast receiving device 3600 stores the received still image data in the main memory 3610. The procedure for storing still image related data in the main memory 3610 is similar to the procedure for the still image data described above.
[0048]
As described above, the digital broadcast receiving apparatus according to the present invention has been described based on the embodiments, but the present invention is not limited to these embodiments. That is,
(1) In the embodiment, 150 still image data and one still image-related data are repeatedly transmitted from the digital broadcast transmitting apparatus side, but the present invention is not limited to this. These still image data and one still image related data may be paired, and 150 sets thereof may be repeatedly transmitted. In this case, the still image related data is information indicating only still image data directly linked from one still image data paired therewith.
Here, the link is information for specifying still image data to be displayed next in order to realize display transition based on a user operation between a still image and a still image, and is currently displayed. Information related to still images. For example, in the still image related data paired with the seventh still image data, the still image that can be selected by the user when the seventh still image is displayed is the eighth or ninth still image. If there is, the numbers 8 and 9 for identifying these still image data are included as information indicating the link destination.
As described above, even if the still image data and the still image related data indicating the identification information of the still image data that is a link destination from the still image data are paired, the digital broadcast receiving device Referring to the image related data, the prediction control operation generally follows the flowchart shown in FIG. However, when taking still image data into the main memory, the still image related data paired therewith is also taken into the main memory.
In addition, this
Even when such still image data and still image related data are paired, the digital broadcast receiving apparatus captures all the still image related data in the main memory in advance and displays the still image as shown in the embodiment. As the image information table (see FIG. 4), the prediction control operation may be performed with reference to the still image information table.
[0049]
(2) In the embodiment, the still image related data indicates information such as which still image is a child of a certain still image, but the user can further select a still image that is a child. It is good also as including the information which shows the order with high possibility of being performed. For example, the still image information table shown in FIG. 4 indicates that the numbers of still images that are children of the still image with the identification number 1 are 2, 4, 5, 7, 11, and 50. Still picture-related data may be created in advance on the digital broadcast transmitting apparatus side so that the order of numbers is the order in which the user is likely to be selected. In this case, the prediction control operation performed by the CPU 609 shown in FIG. 5 is to store still image data in the main memory in consideration of the high possibility of being selected by the user in step S58. When the still image storage area relating to overflows, it may not be stored thereafter. Further, only those that are highly likely to be selected by the user may be stored in the main memory in advance. As a result, even when the area where the still image can be stored in the main memory is very small, the probability that the still image can be displayed in response to the user's selection operation is improved.
[0050]
(3) In the first and second embodiments, the number of still image data transmitted from the digital broadcast transmission apparatus is 150. However, the number is not limited to this number. It may be a sheet.
[0051]
(4) In the first and second embodiments, the digital broadcast transmitting apparatus repeatedly transmits 150 still image data. However, it is not always necessary to repeatedly transmit the completely same still image. It may have changed. For example, the still image of “weather forecast” may be a still image that changes to the latest information every three hours. In this case, a processing program that replaces the still image data stored in the main memory 610 with new still image data that has been transmitted at regular intervals is stored in the main memory 610, and the program is executed by the CPU 609. You can do that.
[0052]
(5) In the first and second embodiments, the digital broadcast receiving apparatus 600 temporarily stores still image data extracted from the local memory 604 in the main memory 610. However, the digital broadcast receiving apparatus 600 does not store in the main memory 610 but the local memory 606. It may be stored.
[0053]
(6) In the first embodiment, the output order determination register 705 in the byte conversion circuit 612 is set to 0 if the CPU type is a big endian type and to 1 if the CPU type is a little endian type. Although the initial setting program that operates when the digital broadcast receiving apparatus 600 is activated is set according to the CPU type, the output order determination register 705 may be fixed to 0 or 1 in advance. However, in this case, the CPU 609 adapted to the value of the output order determination register 705 is a constituent element of the digital broadcast receiving apparatus.
[0054]
(7) In the first embodiment, the input data of the byte conversion circuit 612 is 32-bit parallel, and the CPU 609 handles 4 bytes as one word. However, the input data of the byte conversion circuit 612 is limited to 32 bits. If n is an integer greater than or equal to 2, it may be n times 8 and the CPU 609 may handle any number of bytes as one word. If the input data of the byte conversion circuit 612 corresponds to the word length of the CPU 609, the CPU 609 can transfer data such as a still image from the main memory 610 to the local memory 606 at high speed. For example, if the input data of the byte conversion circuit 612 is 32-bit parallel and the word length of the CPU 609 is 4 bytes as in the first embodiment, the performance of the CPU 609 can be maximized.
Further, the byte conversion circuit 612 may transfer the data directly to the decompression circuit 613 instead of transferring the data to the local memory 606.
[0055]
(8) In the main memory storage unit according to the first embodiment, the CPU 609 should display a plurality of still image data that may be selected by the user according to the user's selection as a unit for storing in the main memory 610. In addition to the still image data, the still image data that is a child of the still image is stored in the main memory 610, so that the process for preparing for the next user selection is used. As a process for preparing for the next user selection, a process for preparing for the next user selection, or a process for preparing for the number of user selections. Also good.
For example, in order to prepare for the next selection of the next user, step S52 is referred to the still image information table, and the identification number of the still image that is a child of the Mth still image is changed. What is necessary is just to change so that all the identification numbers of the still image which is a child may be obtained in the array variable N. However, if many still images are stored in the main memory in advance, the capacity of the main memory 610 that can be used for storing still images must be increased.
[0056]
(9) In the predictive control operation (see FIG. 5) of the CPU 609 shown in the first embodiment, the selection operation by the user is performed at step S56 every time one still image data is taken into the main memory at step S58. However, the processing order of the determination is not limited to this. For example, even during execution of processing for sequentially fetching necessary still image data into the main memory based on prediction, the user If any selection operation is performed, the process of sequentially taking the still image data into the main memory may be interrupted, and the process may proceed to step S59.
[0057]
(10) In the arbitration circuit 1615 shown in the fourth embodiment, the still image data expanded by software by the CPU 1609 as shown in the third embodiment addresses the second area in the local memory 1606. If it is input, it is stored in the local memory 1606, and as a result, a still image is displayed by the display circuit 1614.
As another form, the CPU 1609 may input and input the first area in the local memory 1606 without expanding the still image data by software. In this case, the arbitration circuit 1615 In order to transfer the still image data to the first area in the local memory 1606, the still image data is expanded by the expansion circuit 1613 and displayed on the display circuit 1614 as a result. However, the CPU 1609 inputs the still image data to the arbitration circuit 1615 via the byte conversion circuit 1612 in this way only when video and audio data are not input to the arbitration circuit 1615.
[0058]
(11) In the fourth embodiment, the execution time of one processing unit for A transfer and B transfer is set to 2 clocks. However, the execution time of one processing unit is not limited to 2 clocks. Also good. Further, the execution time of one processing unit of A transfer and B transfer may be different.
[0059]
(12) In the fourth embodiment, the end of transfer execution in one processing unit is detected by the transfer counter 2710. However, instead of using the transfer counter, it indicates whether transfer is being executed in one processing unit or not. Any circuit may be used, for example, a circuit that holds 1 during execution of one processing unit and holds 0 when transfer of one processing unit is not being executed.
[0060]
(13) In the fourth embodiment, the case where priority is given to the transfer of B has been described. However, the value of the priority holding unit 2711 of the arbitration circuit 1615 can be changed at any time.
[0061]
【The invention's effect】
As is clear from the above description, the digital broadcast receiving apparatus according to the present invention receives a plurality of still image data repeatedly transmitted from a digital broadcast transmitting apparatus, and obtains a single still image designated by the user. A digital broadcast receiving apparatus for displaying, wherein storage means, receiving means for sequentially receiving a plurality of still image data, and predicting one or more still images specified by a user prior to the specification A prediction unit configured to perform, a still image capture unit configured to capture still image data of a still image predicted by the prediction unit among the plurality of still image data received by the reception unit into the storage unit, and a user A designation receiving unit that receives a designation of a still image, and a use received by the designation receiving unit among one or a plurality of still image data stored in the storage unit Based of the still image data for one still image according to the specified characterized by comprising a display means for displaying the still picture.
Thus, when a plurality of still image data is transmitted from a digital broadcast transmitting device, the digital broadcast receiving device according to the present invention receives the plurality of still image data, and stores the plurality of still image data. One or more items that the user will select are predicted and stored in the storage means prior to the user's selection operation, so that the user can issue a still image display instruction by the selection operation. When this happens, the probability of displaying the still image quickly is increased.
[0062]
In addition, the receiving unit further receives connection information indicating which of the still images that can be designated next by the user when displaying the still images for each of the plurality of still images. One or more of the prediction means that will be specified by the user by referring to the connection information stored in the storage means by the receiving means. It is also possible to predict a still image.
As a result, the digital broadcast receiving apparatus according to the present invention enables information indicating which still image can be selected by the user in a state where a certain still image is displayed, that is, between still images. Since the link information indicating the link relationship is received, by predicting the still image data to be stored in the storage unit with reference to this, for example, a still image not related to the link is not stored in the storage unit. The storage area capacity of the storage means for storing still image data can be kept small.
[0063]
In addition, the prediction unit refers to the connection information stored in the storage unit, and at least follows the designation of the still image by the user in relation to the still image displayed by the display unit. It is also possible to predict one or a plurality of still images that will be designated by the user by one designation operation.
Thereby, the digital broadcast receiving apparatus according to the present invention recognizes the still image designated by the user, refers to the link information, the still image that the user will select in the next operation, It is possible to predict a still image or the like that will be selected by the next several operations.
Therefore, by storing the still image data in the storage unit in advance based on this prediction, the probability of quickly displaying the still image selected by the user is increased. In addition, the ability to predict the still image that the user will select in the next operation allows the number of still image data to be prefetched for quick display of the still image to be limited to the minimum necessary number. The storage area capacity of the storage means for storing still image data can be kept small.
[0064]
The designation accepting unit accepts designation of a still image by a user even while the still image fetching unit fetches still image data into the storage unit, and the prediction unit includes the designation accepting unit. When the still image according to the designation is displayed by the display means as a result of the designation being accepted by, the prediction result made so far is discarded, the prediction is newly started, and the still picture is captured. When the designation is accepted by the designation accepting unit, the means stores the still image data if the still image data for one still image related to the designation is not yet stored in the storage unit. And when the prediction result is discarded by the prediction unit and a new prediction is started, the still image data about the still image newly predicted by the prediction unit is stored. It is also possible to be incorporated into serial storage means.
As a result, the digital broadcast receiving apparatus according to the present invention performs a new prediction again in response to the user's designation, so that the still image data to be stored in the storage means in advance according to the current state is specified. Even when the storage area capacity of the storage means for storing still image data is small, the probability of promptly displaying the still image when the user gives an instruction to display a still image by a selection operation is increased.
[0065]
Further, the still image data is digitally compressed and transmitted from the transmission device of digital broadcasting, and the display means is a display data storage unit that is a memory for storing data to be displayed, A decompression unit for decompressing the digitally compressed data; and an image display unit for displaying an image based on the data stored in the display data storage unit, wherein the display means uses the decompression unit to It is also possible to display the still image using the image display unit by expanding the still image data according to the designation and storing it in the display data storage unit.
Thus, the digital broadcast receiving apparatus according to the present invention uses the still image data predicted by the prediction means as a display instruction from the user when the still image data is digitally compressed and transmitted from the digital broadcast transmitting apparatus side. Since it can be stored in a compressed state when it is stored in the storage means in advance, the storage area capacity of the storage means can be kept small.
[0066]
The decompression unit decompresses the still image data specified by a user by executing a computer program, and the still image data is transmitted together with video data from the digital broadcast transmission device, The digital broadcast receiving apparatus further includes video receiving means for receiving the video data, and the display means further supplies the display data storage unit for the still image data specified by the user expanded by the expansion unit. A transfer control unit that performs arbitration between the first transfer and the second transfer of the video data received by the video receiving unit to the display data storage unit, and the transfer control unit includes: A transfer necessity detector for detecting that the necessity for one transfer or the second transfer has occurred and that the necessity has not occurred; and The transfer right is exclusively granted to any one of the two transfers, and the transfer necessity is detected when the transfer necessity detection unit detects that the transfer is necessary. If the transfer right is granted to the transfer in which the transfer occurs, and the necessity is generated for both the first transfer and the second transfer, the transfer is performed while the need is generated. A transfer that grants the transfer right to the first transfer and grants the transfer right to the first transfer if the necessity does not occur for either the first transfer or the second transfer. The transfer right is granted by the transfer right granting unit with respect to a transfer detected by the transfer necessity detecting unit among the right transfer unit and the first transfer or the second transfer. When the transfer It is also possible to include a transfer execution unit for executing.
As a result, the digital broadcast receiving apparatus according to the present invention can display the still image by expanding the compressed still image data without using the expansion circuit in the MPEG decoder. Therefore, there is only one expansion circuit. Even when a non-MPEG decoder is used, during the still image display, the MPEG decoder can expand the compressed data of another video or audio so that the video can be displayed over the still image. Become.
Furthermore, the digital broadcast receiving apparatus according to the present invention can arbitrate data transfer of received still image data and video data to one display data storage memory, and In both cases, transfer rights are given to the transfer of still image data when there is no need to transfer, so the next transfer of still image data will start without requiring time to request the transfer right. Therefore, even if the image is somewhat deteriorated, it is suitable for a purpose of quickly displaying a still image.
[0067]
In addition, the image display unit includes a transfer unit that transfers the still image data specified by a user from the storage unit to the decompression unit, and the transfer unit is configured to input n (n is 2 or more). An input buffer that temporarily stores 8 bits of data), and a CPU that takes n bytes as one word, takes out the still image data from the storage means, and stores n bytes in the input buffer. A counter that counts from 0 to (n−1) or (n−1) to 0, and an output order storage unit that stores in advance values indicating whether the counter is advanced in ascending order or descending order; A data selection unit that selects any one of n pieces of 8-bit data stored in the input buffer according to the value of the counter, and the 8-bit data selected by the data selection unit. The may be a fact composed of a data output unit to be transferred to the expansion unit.
As a result, the digital broadcast receiving apparatus according to the present invention allows the CPU to read still image data in word units from the main memory even when the decompression circuit inside the MPEG decoder can process only 8-bit parallel data. Can be input to the MPEG decoder. Accordingly, the CPU can transfer still image data in byte units at a higher speed than when transferring the still image data from the main memory to the MPEG decoder.
[0068]
The connection information is repeatedly transmitted from the transmission device, and the reception unit receives the connection information transmitted from the transmission device and stores the connection information in the storage unit only once. You can also.
As a result, the digital broadcast receiving apparatus according to the present invention stores the connection information indicating the connection relationship between the still images in the storage unit only once, and refers to this information to specify the still image that will be designated by the user. Since the image can be predicted, it is not necessary to sequentially store the connection information in the storage means.
[0069]
The link information is paired with each of the still image data, and can be specified next by the user when the still image is displayed by the display unit based on the still image data. The link information is repeatedly transmitted from the transmission device, and the reception unit transmits the plurality of links transmitted from the transmission device. Information is received and sequentially stored in the storage means, and the prediction means is a still image displayed by the display means among the plurality of link information stored in the storage means by the reception means. By referring to one link information paired with the still image data for the user, the user can perform a single designation operation subsequent to the designation of the still image by the user. It may be to predict one or more still images will be constant.
Accordingly, since the link information is a set of link information, the digital broadcast receiving apparatus according to the present invention is next designated by the user when a certain still image is displayed by at least one link information. It is possible to predict a still image that will be recorded, and even if the storage area capacity of the storage means is small.
[0070]
The digital broadcast receiving apparatus according to the present invention receives a plurality of digitally compressed still image data repeatedly transmitted from a digital broadcast transmitting apparatus, and displays one still image designated by the user. A digital broadcast receiving apparatus that outputs an image signal for storing a storage unit, a receiving unit that sequentially receives a plurality of the still image data, and one or more still images that are specified by a user A prediction unit configured to perform, a still image capture unit configured to capture still image data of a still image predicted by the prediction unit among the plurality of still image data received by the reception unit into the storage unit, and a user A designation accepting unit that accepts designation of a still image, and one or a plurality of still image data stored in the storage unit; Characterized in that it comprises an extension output means for outputting an image signal by decompressing the still picture data for one still image according to the designated use's.
Thus, when a plurality of still image data is transmitted from a digital broadcast transmitting device, the digital broadcast receiving device according to the present invention receives the plurality of still image data, and stores the plurality of still image data. One or more items that the user will select are predicted and stored in the storage means prior to the user's selection operation, so that the user can issue a still image display instruction by the selection operation. The probability of quickly outputting an image signal for displaying the still image is increased.
[0071]
In addition, the reception unit further receives connection information indicating which still image can be designated by the user in a state in which an image signal related to the still image is output for each of the plurality of still images. One or more of the prediction means that will be specified by the user by referring to the connection information stored in the storage means by the receiving means. It is also possible to predict a still image.
As a result, the digital broadcast receiving apparatus according to the present invention, in a state in which an image signal of a certain still image is being output, information indicating which still image the user can select next, that is, Since connection information indicating a connection relationship between still images is received, by referring to this information and predicting still image data to be stored in the storage unit, for example, a still image not related to connection is stored in the storage unit. Thus, the storage area capacity of the storage means for storing still image data can be kept small.
[0072]
The digital broadcast receiving apparatus according to the present invention is a digital broadcast receiving apparatus that receives first type data and second type data transmitted from a digital broadcast transmitting apparatus and outputs a signal based on these data. A signal output means for outputting a signal based on the input data, a receiving means for receiving the first type data and the second type data, and the first type data from the data received by the receiving means. First extracting means for extracting the second type data from the data received by the receiving means, and from the first extracting means for the first type data to the signal output means Transfer control means for performing a first transfer and a second transfer of the second type data from the second extraction means to the signal output means while arbitrating, the transfer control means A transfer necessity detection unit for detecting that the necessity for the first transfer or the second transfer has occurred and that the necessity has not occurred, and the first transfer and the second transfer. A priority information storage unit for storing priority information indicating which is to be preferentially performed, and a transfer right exclusively for the transfer of the first transfer or the second transfer. When the transfer necessity detecting unit detects that the transfer is necessary, the transfer right is granted to the transfer where the transfer is necessary, and the first transfer and the first transfer If the necessity arises for both of the two transfers, the transfer right is given to the person who has produced the necessity first while the necessity arises, and the first transfer and the second transfer are given. The need arises for both forwarding and If there is not, a transfer right granting unit that grants the transfer right to the transfer to be preferentially performed with reference to the priority information storage unit, and the transfer necessity among the first transfer and the second transfer A transfer execution unit that executes the transfer when the transfer right is granted by the transfer right granting unit with respect to the transfer that is detected to be necessary by the detection unit. To do.
As a result, the digital broadcast receiving apparatus according to the present invention can control the transfer according to the importance of the data to be transferred with respect to the data transfer for outputting the received data by decompression or the like. Since it is possible to preferentially handle still image data as an arbitration method for transfer with video data, the probability of promptly displaying a still image selected by the user is increased.
[0073]
Further, the first type data is graphic data for displaying graphics, the second type data is moving image data for displaying moving images, and the priority information storage unit includes the graphic data. Priority information indicating that transfer is preferentially performed is stored, and the right granting unit determines whether the transfer is necessary for both the first transfer and the second transfer by the transfer necessity detection unit. When it is detected that the image is not generated, the transfer right is granted to the first transfer, and the output means superimposes the graphics and the moving image based on the inputted graphic data and the moving image data. It is also possible to output an image signal for display.
As a result, the digital broadcast receiving apparatus according to the present invention can quickly display a graphics display such as a program guide, and display a moving image superimposed on the background.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus 600 according to Embodiment 1 of the present invention.
FIG. 2 is a block diagram showing an internal configuration of a byte conversion circuit 612;
FIG. 3 is an image diagram showing a relationship between still images.
FIG. 4 is a diagram showing the contents of a still image information table.
FIG. 5 is a flowchart of processing for storing a plurality of still image data that may be selected by a user in the main memory 110;
6 is a block diagram showing a configuration of a digital broadcast receiving apparatus 1600 according to Embodiment 3. FIG.
FIG. 7 is a diagram illustrating a display surface on which video and graphics are displayed in an overlapping manner.
FIG. 8 is a functional block diagram of an arbitration circuit 1700 that is normally considered.
FIG. 9 is a flowchart showing a processing flow of a transfer right setting unit 1709 in an arbitration circuit 1700 that can be considered normally.
FIG. 10 is a flowchart showing a processing flow of a transfer right check unit 1701 of A in a conceivable arbitration circuit 1700;
FIG. 11 is a processing timing diagram of an arbitration circuit 1700 that is normally considered.
FIG. 12 is a functional block diagram of an arbitration circuit 1615 according to the present invention.
13 is a flowchart showing a processing flow of a transfer right setting unit 2709 in the arbitration circuit 1615. FIG.
FIG. 14 is a flowchart showing a processing flow of a transfer right check unit 2701 of A in the arbitration circuit 1615.
15 is a processing timing diagram of the arbitration circuit 1615. FIG.
16 is a block diagram showing a configuration of a digital broadcast receiving apparatus 3600 according to Embodiment 5. FIG.
FIG. 17 is a diagram illustrating an operation image for selecting a still image.
FIG. 18 is a diagram illustrating an image of still image data transmitted from the digital broadcast transmitting apparatus side.
FIG. 19 is a block diagram showing a configuration of a conventional digital broadcast receiving apparatus 100.
[Explanation of symbols]
100, 600, 1600 Digital broadcast receiver
102, 602, 1602 Demodulator
103, 603, 1603 Transport decoder
104, 604, 1604 local memory
105, 605, 1605 MPEG decoder
106, 606, 1606 Local memory
107 Dedicated input port for compressed data stream
109, 609, 1609 CPU
110, 610, 1610 Main memory
111, 1611 serial parallel conversion circuit
113, 613, 1613 expansion circuit
114, 614, 1614 Display circuit
608, 1608 CPU access port
612, 1612 byte conversion circuit
702 Input buffer
703 Data selector
705 Output order determination register
707 counter
1607 Stream input port
1615 Arbitration circuit
2701 A Transfer Rights Check Department
2702 A transfer controller
2703 A transfer request holding unit
2704 A transfer right holder
2705 B Transfer Rights Check Department
2706 B transfer control unit
2707 B transfer request holding unit
2708 B transfer right holder
2709 Transfer right setting section
2710 Transfer counter
2711 Priority holding unit

Claims (4)

A digital broadcast receiver that receives a plurality of still image data repeatedly transmitted from a digital broadcast transmitter and displays a single still image designated by a user,
Storage means;
Receiving means for repeatedly receiving the plurality of still image data and receiving connection information indicating a connection relationship between the still images;
A designation accepting means for accepting designation of a still image by a user;
Predicting means for predicting one or more still images that will be designated next by the user prior to the next designation by referring to the connection information for the still picture designated by the designation receiving means. When,
A still image capturing unit that captures the still image data into the storage unit when the receiving unit receives still image data about the still image predicted by the prediction unit;
Based on the still image data of one still image related to the user's designation received by the designation receiving unit among the one or more still image data stored in the storage unit, the still image is displayed. and a display means for,
The prediction unit refers to the connection information stored in the storage unit, and relates to the still image displayed by the display unit at least once following the designation of the still image by the user. Predict one or more still images that will be specified to the user by the specifying operation of
The designation accepting unit accepts designation of a still image by a user even while the still image capturing unit captures still image data in the storage unit,
When the display unit displays a still image related to the designation as a result of accepting the designation by the designation accepting unit, the prediction unit discards the prediction result performed so far and newly creates the prediction Start
When the designation is accepted by the designation accepting unit, the still image capturing unit is configured to store the still image data for one still image according to the designation if the still image data is not yet stored in the storage unit. Image data is taken into the storage means, and when the prediction result is discarded by the prediction means and a new prediction is started, still image data about the still image newly predicted by the prediction means is stored in the storage means. Capture,
The still image data is digitally compressed and transmitted from the transmission device of digital broadcasting,
The display means includes
A display data storage unit which is a memory for storing data to be displayed;
A decompression unit for decompressing digitally compressed data;
An image display unit that displays an image based on the data stored in the display data storage unit,
The display means displays the still image using the image display unit by expanding the still image data specified by the user using the expansion unit and storing it in the display data storage unit. ,
The decompression unit decompresses the still image data according to the user's designation by executing a computer program,
The still image data is transmitted together with video data from the transmission device of digital broadcasting,
The digital broadcast receiving apparatus further comprises video receiving means for receiving the video data,
The display means further includes a first transfer of the still image data, which is specified by the user expanded by the expansion unit, to the display data storage unit, and the video data received by the video reception unit. A transfer control unit that performs the second transfer to the display data storage unit while arbitrating;
The transfer control unit
A transfer necessity detector for detecting that said it and the necessity necessity occurs for the first transfer or the second transfer is not Ji live,
The transfer right is exclusively granted to either the first transfer or the second transfer, and the transfer necessity detecting unit detects that the transfer is necessary. When the transfer right is granted to the transfer in need of transfer, and the necessity arises for both the first transfer and the second transfer, the necessity arises. The transfer right is granted to the person who has generated the necessity first, and if the necessity has not occurred in either the first transfer or the second transfer, the first transfer is performed. A transfer right granting unit for granting the transfer right;
When the transfer right is granted by the transfer right granting unit for the transfer detected by the transfer necessity detecting unit among the first transfer or the second transfer, A digital broadcast receiving apparatus comprising: a transfer execution unit that executes the transfer . The image display unit includes a transfer unit that transfers the still image data according to a user designation from the storage unit to the decompression unit,
The transfer unit
An input buffer for temporarily storing n pieces of input 8-bit data (n is an integer of 2 or more);
a CPU that takes n bytes as one word, takes out the still image data from the storage means, and stores it in the input buffer in units of n bytes;
A counter that counts from 0 to (n-1) or (n-1) to 0;
An output order storage unit that stores in advance a value indicating whether the counter is advanced in ascending order or descending order;
A data selection unit that selects any one of 8-bit data stored in the input buffer according to the value of the counter;
It said data digital broadcast receiving apparatus according to claim 1, wherein the 8-bit data selected by the selection unit to consist of a data output unit to be transferred to the expansion unit. The connection information is repeatedly transmitted from the transmission device,
The receiving means is a digital broadcast receiving apparatus according to claim 1, wherein the storing only once in said storage means for receiving the connection information transmitted from the transmitting device. The link information is paired with each of the still image data, and the still image that can be designated next by the user when the still image is displayed by the display unit based on the still image data. It consists of multiple link information indicating whether or not
The plurality of link information is repeatedly transmitted from the transmission device,
The receiving means receives a plurality of the link information transmitted from the transmitting device and sequentially stores them in the storage means,
The prediction means refers to one link information paired with still image data of the still image displayed by the display means among the plurality of link information stored in the storage means by the receiving means. The digital broadcasting according to claim 1, wherein one or a plurality of still images to be designated by the user are predicted by one designation operation subsequent to designation of the still image by the user. Receiver device.

Images