JP2007096407A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver capable of reducing a defect imposed on display of a plurality of kinds of information items even when a processing load is increased in the case that the display of the information items is effective. <P>SOLUTION: In a state that display of data broadcast information and display of close-captioned information are both set effective, a processing load detection section 21 detects a state of use of an input buffer 7 and outputs a control signal for denoting a processing load excess to a control section 1 when the state of use indicates overflow. Then the control section 1 switches the operating mode from an ordinary mode into a processing load reduction mode. The control section 1 controls a data broadcast decoder 12 so as to stop reproduction of the data broadcast information under this mode. Since the processing load of a graphic processing section 13 is reduced, the close-captioned information is displayed on a display section 14 in a correct timing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus having a function of receiving broadcast radio waves including information for data broadcasting and information for caption broadcasting.

  2. Description of the Related Art Conventionally, digital broadcast receivers that receive digital broadcasts such as terrestrial digital broadcasts and satellite digital broadcasts have been operated. In this digital broadcast receivers, video information, audio information, data broadcast information, and the like are used. It has a function of receiving multiplexed broadcast radio waves and reproducing video information, audio information, and data broadcast information included in the broadcast radio waves (see, for example, Patent Document 1).

This broadcast radio wave includes information for subtitle broadcast depending on the program, and some digital broadcast receiving apparatuses have a function of reproducing the information for subtitle broadcast.
JP 2004-129310 A

  However, the processing speed for reproducing video information, audio information, data broadcasting information, and subtitle broadcasting information depends on the size of decoding processing capability, graphic processing capability, memory bus bandwidth, and the like. Thus, for example, when the processing load increases, for example, when a large-area caption is frequently updated on the display screen and content is received that frequently updates the large-area data broadcasting screen. May not be able to perform normal processing on the display. In this case, synchronization between reproduction of video and audio information and reproduction of information for subtitle broadcasting is disturbed, or a part of information to be reproduced is lost without being reproduced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a digital broadcast receiving apparatus that can alleviate inconveniences associated with display even when the processing load increases when the display of multiple types of information is enabled. .

  That is, a digital broadcast receiving apparatus according to the present invention includes a receiving channel selection means for receiving and selecting a broadcast radio wave, video information included in the received and selected broadcast radio wave, data broadcasting information independent of the video information, and A reproduction means for reproducing the information for subtitle broadcasting, and when the magnitude of the processing load required for the reproduction is detected and the detection result satisfies a predetermined condition, the above-mentioned reproduction content is processed by the processing load. It is characterized by being able to change the playback content to be reduced.

  In the digital broadcast receiving apparatus according to the present invention, reception channel selection means for receiving and selecting broadcast radio waves, video information included in the broadcast radio waves selected for reception, information for data broadcasting independent of the video information, and caption broadcasting And a reproducing means for reproducing the information for use, and detecting the amount of processing load required for the reproduction, and when the detection result satisfies a predetermined condition, the processing load of the above-described reproduction content is reduced. Since the reproduction contents are changed, it is possible to reduce the inconvenience associated with the display even when the processing load increases when the display of a plurality of types of information is enabled.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, a first embodiment of the present invention will be described.
FIG. 1 is a block diagram showing a configuration example of an internal circuit of the digital broadcast receiving apparatus according to the first embodiment of the present invention.
This digital broadcast receiving apparatus includes a control unit 1 that controls the operation of the entire apparatus, and a tuner unit 3 that selects a radio wave of a broadcasting station selected in advance from a broadcast wave of a terrestrial digital television broadcast received by a TV (television) antenna 2. And a demultiplexer 4 that demodulates the selected radio wave and separates it into a TV video signal, a TV audio signal, a data broadcast signal, and a caption broadcast signal.

  The digital broadcast receiving apparatus further includes input buffers 5, 6, 7 and a data broadcast data storage unit 8. The input buffer 5 temporarily stores information included in the TV audio signal separated by the demultiplexer 4. The input buffer 6 receives the TV video signal separated as described above and temporarily accumulates this signal. The input buffer 7 temporarily stores the subtitle broadcast signal separated as described above. The data broadcast data storage unit 8 stores the data broadcast signals separated as described above.

  The digital broadcast receiving apparatus further includes an audio decoder 9, a video decoder 10, a caption decoder 11, and a data broadcast decoder 12. The audio decoder 9 decodes (decodes) the TV audio signal stored in the input buffer 5 and outputs it. The video decoder 10 decodes and outputs the TV video signal stored in the input buffer 6. The subtitle decoder 11 decodes the subtitle broadcast signal stored in the input buffer 7 and outputs it. The data broadcast decoder 12 decodes and outputs the data broadcast signal stored in the data broadcast data storage unit 8 when necessary.

  The digital broadcast receiving apparatus selects one or a plurality of signals from the signals input from the video decoder 10, the caption decoder 11, the data broadcast decoder 12, etc., and synthesizes them and outputs them to the display unit (monitor) 14. The graphic processing unit 13 is provided. The graphic processing unit 13 performs scaling and image synthesis on the selected signal, and outputs the signal obtained by the synthesis to the display unit 14. The signal output from the audio decoder 9 is input to the audio reproduction unit (speaker) 15.

  The digital broadcast receiving apparatus includes a processing load detection unit 21 and a setting variable detection unit 22. The digital broadcast receiving apparatus further includes a remote control receiving unit 23 that receives an infrared signal from a remote control 24 that is an input device. The remote control receiving unit 23 is connected to the control unit 1.

  The processing load detection unit 21 quantifies the processing load required for reproducing TV video, TV sound, information for subtitle broadcasting, and information for data broadcasting, and determines whether or not this numerical value satisfies a predetermined condition. . The setting variable detection unit 22 detects the presence / absence of subtitle broadcast information and data broadcast display by the user's operation on the remote controller 24, the channel selection, and the program content change.

  The remote controller 24 includes various keys such as a transmitter for performing infrared communication with the remote controller receiver 23, a power key for turning on / off the power of the digital broadcast receiver, and a cursor key on a stick.

Next, the operation of the digital broadcast receiving apparatus having the configuration shown in FIG. 1 will be described.
This digital broadcast receiving apparatus has a function of reducing inconveniences associated with these display forms even when the processing load for displaying various information increases. Here, the inconvenience related to the display form means that display of various information is delayed or the display itself is lost. However, reductions in the resolution of the display image, the number of display colors, the frame rate, and the like are not included in the inconvenience related to the display mode described above.

  In this digital broadcast receiving apparatus, the normal TV video information of the channel that the user is viewing, the information for data broadcasting of the same channel and the information for subtitle broadcasting of the same channel are displayed on the monitor together, and the amount of information of various types of information is preliminarily displayed. It is assumed that when the information for data broadcasting is frequently updated manually in accordance with the operation on the remote controller 24 that exceeds a predetermined value, display delay or omission of various information occurs.

  The information for data broadcasting is, for example, character information and image information indicating news or weather forecast, and is information independent of the above-described normal TV video information and information for subtitle broadcasting. Also, the information for subtitle broadcasting is, for example, character information indicating a dubbed speech of a movie, and is information independent of the above-described normal TV video information and information for data broadcasting.

FIG. 2 is a flowchart showing an example of display control processing by the digital broadcast receiving apparatus according to the first embodiment of the present invention.
This digital broadcast receiving apparatus performs processing in accordance with either the normal mode or the processing load reduction mode. When the power of the digital broadcast receiving apparatus is turned on, the control unit 1 starts processing according to the normal mode.

  When the operation mode is the normal mode, the control unit 1 controls whether to display the TV video information, the information for data broadcasting, and the information for subtitle broadcasting on the display unit 14 according to the display setting by operating the remote controller 24.

  On the other hand, in the case where the current operation mode is the processing load reduction mode, the control unit 1 displays one of the pieces of information in which the display on the display unit 14 is enabled by the display setting by the operation of the remote controller 24. By changing this, the processing load for displaying various types of information on the display unit 14 is reduced, and delays or omissions in the display of these information do not occur.

  When the operation mode is the normal mode and the display of the data broadcast information and the subtitle broadcast information is both enabled through predetermined operations of the various keys of the remote controller 24, the graphic processing unit 13 is set to the TV video signal, Graphic processing such as scaling and image composition based on the data broadcast signal and the subtitle broadcast signal is performed, and the resultant signal is output to the display unit 14.

  In this state (YES in step S1), the digital broadcast receiving apparatus determines whether the processing load for displaying various information on the display unit 14 satisfies a predetermined condition. Specifically, the control unit 1 detects a free state of the input buffer 7 for caption broadcasting, and outputs a control signal including information obtained by quantifying the free state to the processing load detection unit 21. Then, the processing load detection unit 21 determines whether or not the use state is an overflow state by comparing the empty state value of the input buffer 7 with a predetermined reference value (step S2).

  Alternatively, when receiving a subtitle broadcast signal, the control unit 1 obtains the size of the subtitle broadcast data from the demultiplexer and outputs a control signal including information obtained by quantifying the free state of the input buffer 7 to the processing load detection unit 21. Output to. Then, the processing load detection unit 21 determines whether or not the input buffer 7 is in an overflow state by comparing whether or not the numerical value of the used empty state of the input buffer 7 is smaller than the size of the subtitle broadcast data. (Step S2).

  When the usage state of the input buffer 7 is an overflow state, information for subtitle broadcast is lost, and a state in which the information for subtitle broadcast is not normally displayed on the display unit 14 occurs. In this case, since the processing load on the graphic processing unit 13 is also increasing, there is a possibility that normal display of information for subtitle broadcasting and information for data broadcasting on at least one display unit 14 may not be performed. In particular, if the information for subtitle broadcasting is not normally displayed on the display unit 14, the video information and the information for subtitle broadcasting are not displayed on the display unit 14 in synchronization with each other. When the control unit 1 determines that the above-described usage state is an overflow state, the control unit 1 determines that the information for subtitle broadcasting is not displayed on the display unit 14 at a normal timing.

  FIG. 3 is a diagram showing an example of the reproduction timing of each information when video information and subtitle broadcast information are reproduced in synchronization by the digital broadcast receiving device according to the first embodiment of the present invention. is there.

  FIG. 4 is a diagram illustrating an example of the reproduction timing of each information when the video information and the information for subtitle broadcasting are not reproduced in synchronization by the digital broadcast receiving device according to the first embodiment of the present invention. is there.

  Further, the control unit 1 may perform other processing in order to determine whether or not the information for subtitle broadcasting is normally displayed on the display unit 14. Specifically, the control unit 1 extracts information on the scheduled display start time of each character data included in the signal input to the input buffer 7 in association with the identifier of the character data. The caption decoder 11 outputs a control signal indicating this to the control unit 1 together with the identifier of the character data every time the decoding process of each character data signal is completed.

  When the control unit 1 receives the control signal from the caption decoder 11, the control unit 1 measures the input time of this signal by an internal clock circuit (not shown). The control unit 1 outputs the input information and time information to the processing load detection unit 21. The processing load detector 21 calculates a difference value between the input time indicated by this information and the scheduled display start time associated with the same identifier as the character data identifier related to the input time. This difference value corresponds to the time T shown in FIG. When the calculated difference value exceeds a predetermined reference value, the control unit 1 determines that the information for subtitle broadcasting is not displayed on the display unit 14 at a normal timing.

  In addition, when the information for subtitle broadcasting is not reproduced, the control unit 1 obtains information on the predetermined display start scheduled time of each image included in the signal input to the data broadcast data storage unit 8. Extracted in association with an image identifier. The data broadcast decoder 12 outputs a control signal indicating this to the control unit 1 together with the identifier of the image every time the decoding process of the signal of each image is completed.

  When the control unit 1 receives a control signal from the data broadcast decoder 12, the control unit 1 measures the input time of this signal by an internal clock circuit (not shown). The control unit 1 outputs the input information and time information to the processing load detection unit 21. The processing load detector 21 calculates a difference value between the input time indicated by the input information and the scheduled display start time associated with the same identifier as the identifier of the image related to the input time. When the calculated difference value exceeds a predetermined reference value, the control unit 1 determines that the information for data broadcasting is not displayed on the display unit 14 at a normal timing.

  When the processing load detection unit 21 determines that normal display of information for caption broadcasting is not performed on the display unit 14 or when it is determined that normal display of information for data broadcasting is not displayed on the display unit 14 ( In step S2, the control signal indicating the excess processing load is output to the control unit 1.

  When the control unit 1 receives the control signal from the processing load detection unit 21, the control unit 1 outputs the control signal to the graphic processing unit 13 so that the character information of the warning message stored in advance in the internal memory is displayed on the display unit 14 (Step S1). S3). This warning message is “reducing processing load”, for example.

  The warning message is not limited to text information but may be voice information. Therefore, the control unit 1 may output the audio information of the warning message stored in advance in the internal memory to the audio reproduction unit 15.

  Then, the control unit 1 switches the operation mode from the normal mode to the processing load reduction mode. In this mode, the control unit 1 performs processing load reduction processing for displaying various information on the display unit 14 (step S4). Specifically, the control unit 1 controls the data broadcast decoder 12 so that the reproduction of information for data broadcasting is stopped. As a result, the processing load on the graphic processing unit 13 is reduced, so that information for subtitle broadcasting is displayed on the display unit 14 at the correct timing.

  As another example of the processing load reduction processing for display on the display unit 14, the control unit 1 displays the information for subtitle broadcasting in order to display the information on the information for data broadcasting on the display unit 14 at a normal timing. The subtitle decoder 11 may be controlled so that the reproduction of the video stops.

FIG. 5 is a diagram showing an example of a procedure for synthesizing various types of information including information related to caption broadcasting by the digital broadcast receiving device according to the first embodiment of the present invention.
FIG. 6 is a diagram showing an example of a procedure for synthesizing various types of information other than information related to caption broadcasting by the digital broadcast receiving device according to the first embodiment of the present invention.

  As shown in FIG. 5, in order to display moving image information, text / graphic information for data broadcasting, background information for data broadcasting, and information for subtitle broadcasting together on the display unit 14, the graphic processing unit 13 Performs scaling processing on video information, synthesizes text / graphic information for data broadcasting and background information for data broadcasting, synthesizes information for subtitles with this synthesized information, and scales the information as described above. Combine the information of the later video. The moving image information is TV image information.

  On the other hand, as shown in FIG. 6, when the information for subtitle broadcasting is not to be displayed on the display unit 14, the graphic processing unit 13 performs scaling processing on the information of the moving image, and the characters / graphics for data broadcasting are displayed. The information and the background information for data broadcasting are combined, and the above-mentioned scaled moving picture information is combined with the combined information.

  That is, when three types of information are combined as shown in FIG. 6 as compared with the case where four types of information are combined as shown in FIG. The processing load of the unit 13 is reduced.

  After the control unit 1 performs the processing load reduction process for display on the display unit 14, the setting variable detection unit 22 monitors the processing content of the control unit 1. As a result of this monitoring, the setting variable detection unit 22 operates when the display setting of the information for data broadcasting or the information for subtitle broadcasting is invalidated or the channel selection channel is changed by the operation on the remote controller 24, or the program being received is changed. If it is determined that the broadcast has ended and another program has started, the processing load on the display unit 14 is considered to have been reduced, and the processing load on the display unit 14 is displayed. A control signal indicating that the reduction process is canceled is output to the control unit 1.

  When the control unit 1 receives the control signal from the setting variable detection unit 22, the control unit 1 returns the operation mode from the processing load reduction mode to the normal mode. Then, the information displayed on the display unit 14 is information in which the display setting is valid according to the operation on the remote controller 24 before the operation mode shifts to the processing load reduction mode.

  As described above, in the digital broadcast receiving apparatus according to the first embodiment of the present invention, when data broadcasting information and subtitle broadcasting information are simultaneously displayed, at least one type of information is displayed. By changing the display form, the processing load for displaying various information on the display unit 14 can be reduced, so that delays and omissions in processing for displaying various information can be prevented.

  Next, another example of the processing load reduction process described above will be described. In the processing described above, it has been described that the display of one type of information is stopped when the information for data broadcasting and the information for subtitle broadcasting are simultaneously displayed. However, when this processing is performed, the information for data broadcasting and the subtitle are displayed. Broadcast information cannot be displayed on the display unit 14 at the same time.

Hereinafter, while maintaining the display of the data broadcasting information and the subtitle broadcasting information on the display unit 14, the processing load reduction processing for displaying various types of information is prevented so that the display delay or omission of these information does not occur explain.
Examples of this processing include reducing the number of quantization bits of various signals, changing the color format, reducing the resolution, and reducing the frame rate.

  In the above example, the reduction of the number of quantization bits will be described. When the operation mode is shifted to the processing load reduction mode, the control unit 1 outputs a control signal for instructing the graphic processing unit 13 to reduce the number of quantization bits of the input / output signal. When this control signal is input, the graphic processing unit 13 reduces the number of quantization bits of some or all of the various input / output signals to a predetermined number of bits.

  As a result, the color resolution of various types of information displayed on the display unit 14 is reduced, but the amount of signal processing required for scaling and synthesis processing by the graphic processing unit 13 is reduced, so the processing load for displaying various types of information is reduced. Become. As a result, the amount of update of various types of information per unit time is increased, and the information for subtitle broadcasting and the information for data broadcasting on the display unit 14 can be updated smoothly.

  The change of the color format in the above example will be described. Here, when the operation mode is the normal mode, the video decoder 10, the caption decoder 11 and the data broadcast decoder 12 output color signals as RGB signals of 8 bits each for a total of 24 bits.

  When the operation mode is shifted to the processing load reduction mode, the control unit 1 outputs a control signal indicating the change of the color format of the color signal to the video decoder 10, the caption decoder 11, and the data broadcast decoder 12.

  When the video decoder 10, the subtitle decoder 11 and the data broadcast decoder 12 input this control signal, the color signal is a total of 16 bits including a luminance signal Y: 8 bits, a color difference signal RY: 4 bits, and BY: 4 bits. Output as a signal. This reduces the number of bits per pixel of the color signal.

  As another example of the color format change, the control unit 1 gives a control signal indicating the change of the color format of the color signal to the input stage of the graphic processing unit 13 when the operation mode is shifted to the processing load reduction mode. You may make it output. When such a color format change is performed, the color resolution of various types of information is reduced, but the amount of signal processing required for scaling and combining processing by the graphic processing unit 13 is reduced, so that the processing load for displaying various types of information is reduced. become.

  In the above example, resolution reduction will be described. When the operation mode is shifted to the processing load reduction mode, the control unit 1 outputs a control signal indicating that the resolution of the output signal is changed to the video decoder 10, the caption decoder 11, and the data broadcast decoder 12. When the video decoder 10, subtitle decoder 11 and data broadcast decoder 12 receive this control signal, the resolution of the output signal is reduced to a predetermined resolution. As a result, the amount of signal processing required for scaling and synthesis processing by the graphic processing unit 13 is reduced, so that the processing load for displaying various types of information is reduced.

  As another example of resolution reduction, the control unit 1 outputs a control signal indicating that the resolution of the input signal is reduced to the graphic processing unit 13 when the operation mode is shifted to the processing load reduction mode. When this control signal is input, the graphic output unit 13 inputs the signals from the video decoder 10, the caption decoder 11 and the data broadcast decoder 12 by thinning them out at predetermined intervals. Thereby, the resolution of the signal processed by the graphic processing unit 13 is reduced.

  In the above example, the reduction of the frame rate will be described. When the operation mode is shifted to the processing load reduction mode, the control unit 1 outputs a control signal indicating that the frame rate of the output signal is changed to the video decoder 10, the caption decoder 11, and the data broadcast decoder 12. When this control signal is input, the video decoder 10, the caption decoder 11 and the data broadcast decoder 12 reduce the number of updated images per unit time included in the output signal to a predetermined number. As a result, the amount of signal processing required for scaling and synthesis processing by the graphic processing unit 13 is reduced, so that the processing load for displaying various types of information is reduced.

  As another example of reducing the frame rate, the control unit 1 outputs a control signal indicating that the frame rate of the input signal is reduced to the graphic processing unit 13 when the operation mode is shifted to the processing load reduction mode. To do. When this control signal is input, the graphic output unit 13 inputs the signals from the video decoder 10, the caption decoder 11 and the data broadcast decoder 12 by thinning them at predetermined intervals for each image. Thereby, the resolution of the signal processed by the graphic processing unit 13 is reduced.

  In addition, as a process for reducing the processing load related to the display of various information described above, manual updating of information for data broadcasting according to an operation on the remote controller 24 is disabled instead of controlling signal processing by various decoders and graphic processing unit 13. You may make it. As a result, the update amount of information for data broadcasting is reduced, so that the processing load for displaying various information is reduced.

  In addition, each of a plurality of types of processing load reduction processing for displaying various types of information as described above may be executed in stages. Specifically, when the control unit 1 shifts the operation mode to the processing load reduction mode, first, the manual update of the information for data broadcasting according to the operation on the remote controller 24 is invalidated, and the processing is performed after the execution of this processing. When a control signal indicating excess processing load is input from the load detection unit 21, the number of quantization bits of the signal is reduced by various decoders and the graphic processing unit 13 while maintaining the invalidity of the manual update described above. Control may be performed as follows. Thereby, it is possible to prevent the display contents of various information from being displayed on the display unit 14 from being changed unnecessarily.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The configuration of the digital broadcast receiving apparatus according to the present embodiment is basically the same as that shown in FIG.
FIG. 7 is a block diagram showing a configuration example of an internal circuit of the digital broadcast receiving apparatus according to the second embodiment of the present invention.

  The digital broadcast receiver according to the second embodiment of the present invention is different from the digital broadcast receiver according to the first embodiment of the present invention in that a processing list is used instead of the processing load detector 21 and the setting variable detector 22. A storage unit 31 is provided.

The processing list storage unit 31 stores a predetermined number of pieces of information related to various processes to be executed by the graphic processing unit 13. The various decoders, that is, the video decoder 10, the subtitle decoder 11, and the data broadcast decoder 12, output to the control unit 1 a control signal for requesting graphic processing for the signal subjected to the decoding processing when the decoding processing of the input signal is completed. To do. This control signal includes identification information of the decoder that issued the signal.
When the control unit 1 receives the control signal described above, the control unit 1 stores information included in the signal in the processing list storage unit 31.

FIG. 8 is a diagram showing a configuration example of the processing reservation list stored in the processing list storage unit of the digital broadcast receiving device according to the second embodiment of the present invention in a table format.
In this processing reservation list, processing request contents from various decoders, processing request issuance order, and identification information of a processing request issuing source are associated and managed. The issue order is updated by incrementing by 1 in the order in which the processing requests are issued. Among the managed information, information on processing executed by the graphic processing unit 13 is deleted from the processing reservation list.

Next, the operation of the digital broadcast receiving apparatus according to the second embodiment of the present invention will be described.
In this digital broadcast receiving apparatus, the graphic processor 13 preferentially executes graphic processing relating to information for subtitle broadcasting over graphic processing relating to other information.

FIG. 9 is a flowchart showing an example of display control processing by the digital broadcast receiving apparatus according to the second embodiment of the present invention.
First, the control unit 1 reads the processing reservation list stored in the processing list storage unit 31, and determines whether or not the processing request information from the caption decoder 11 is included in the list (step S11).

  When the control unit 1 determines that the processing request information from the caption decoder 11 is included in the processing reservation list (YES in step S11), the issuer of the processing requests managed in the processing reservation list The decoder is the caption decoder 11 and outputs a control signal for instructing execution of processing according to the processing request with the earliest issue order to the graphic processing unit 13 (step S12).

  Then, the control unit 1 deletes the processing request information regarding the instructed processing from the processing reservation list stored in the processing list storage unit 31 (step S13). As a result, the processing according to the earliest processing request from the caption decoder 11 in the processing reservation list is preferentially executed regardless of the issue order of the entire processing reservation list.

  On the other hand, when the control unit 1 determines that the processing request information from the caption decoder 11 is not included in the processing reservation list (NO in step S11), the processing reservation list stored in the processing list storage unit 31 It is determined whether or not processing request information from a decoder other than the caption decoder 11 is included (step S14).

  When it is determined that the processing reservation list includes processing request information from a decoder other than the caption decoder 11 (YES in step S14), the control unit 1 determines the processing request managed in the processing reservation list. Among them, a control signal for instructing execution of processing according to the processing request with the earliest issue order is output to the graphic processing unit 13 (step S15). Then, the control unit 1 deletes the processing request information regarding the instructed processing from the processing reservation list stored in the processing list storage unit 31 (step S16).

  As described above, in the digital broadcast receiving apparatus according to the second embodiment of the present invention, subtitles are reserved when graphic processing relating to information for subtitle broadcasting and graphic processing relating to other information are both reserved. Since the processing according to the reservation of the graphic processing related to the broadcast information is controlled to be executed with priority, even if the processing load on the graphic processing unit 13 is increased, the subtitle broadcast information is displayed on the display unit 14. The display is not delayed or the display itself is not lost. Therefore, since the synchronization between the TV image being watched by the user and the subtitle information is maintained, the viewer is not confused.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows the structural example of the internal circuit of the digital broadcast receiver according to the 1st Embodiment of this invention. 5 is a flowchart showing an example of display control processing by the digital broadcast receiving device according to the first embodiment of the present invention. The figure which shows an example of the reproduction | regeneration timing of each information in case the video information by the digital broadcast receiver according to the 1st Embodiment of this invention and the information for caption broadcasting are reproduced | regenerated synchronously. The figure which shows an example of the reproduction | regeneration timing of each information in case the video information by the digital broadcast receiver according to the 1st Embodiment of this invention and the information for caption broadcasting are not reproduced | regenerated synchronously. The figure which shows an example of the synthetic | combination procedure of the various information containing the information regarding the caption broadcast by the digital broadcast receiver according to the 1st Embodiment of this invention. The figure which shows an example of the synthetic | combination procedure of various information other than the information regarding subtitle broadcast by the digital broadcast receiver according to the 1st Embodiment of this invention. The block diagram which shows the structural example of the internal circuit of the digital broadcast receiver according to the 2nd Embodiment of this invention. The figure which showed the structural example of the process reservation list memorize | stored in the process list memory | storage part of the digital broadcast receiver according to the 2nd Embodiment of this invention with a table format. The flowchart which shows an example of the display control processing by the digital broadcast receiver according to the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Control part, 2 ... TV antenna, 3 ... Tuner part, 4 ... Demultiplexer, 5, 6, 7 ... Input buffer, 8 ... Data broadcast data storage part, 9 ... Audio decoder, 10 ... Video decoder, 11 ... Subtitle Decoder, 12 ... data broadcast decoder, 13 ... graphic processing unit, 14 ... display unit, 15 ... audio reproduction unit, 21 ... processing load detection unit, 22 ... setting variable detection unit, 23 ... remote control reception unit, 24 ... remote control, 31 ... processing list storage unit.

Claims (10)

Receiving channel selection means for receiving and selecting broadcast radio waves;
Reproduction means for reproducing the video information included in the broadcast radio wave selected for reception, information for data broadcasting independent of the video information, and information for subtitle broadcasting,
Detecting means for detecting the amount of processing load required for reproduction by the reproducing means;
And a control means for changing, when the detection result by the detection means satisfies a predetermined condition, the content reproduced by the reproduction means to be reproduced so that the processing load is reduced. Broadcast receiving device. The control means includes
The reproduction unit is controlled so that reproduction of any one of the information for data broadcasting and the information for subtitle broadcasting is stopped when a detection result by the detection unit satisfies the predetermined condition. The digital broadcast receiver according to claim 1. The control means includes
The reproduction means is controlled so that the display quality of at least one of the video information, the data broadcast and the subtitle broadcast information is lowered when a detection result by the detection means satisfies the predetermined condition. The digital broadcast receiver according to claim 1. It further comprises an input means for accepting an operation related to updating data broadcasting information,
2. The digital broadcast receiving apparatus according to claim 1, wherein the control unit invalidates an operation on the input unit when a detection result by the detection unit satisfies the predetermined condition. The control means includes
Reproduction in which the processing load is reduced by executing any one of a plurality of types of predetermined processing when a detection result by the detection unit satisfies the predetermined condition. Variable in content,
2. The digital processing according to claim 1, wherein a predetermined process that is not executed among the plurality of types is executed when the detection result satisfies the predetermined condition even after the variable execution. Broadcast receiving device. Further comprising storage means for temporarily storing information for subtitle broadcasting included in the broadcast radio wave selected for reception,
The reproduction means reads out the information for subtitle broadcasting stored in the storage means, reproduces the information,
2. The digital broadcast receiving apparatus according to claim 1, wherein the detection unit detects the size of the processing load based on a usage state of the storage unit. It further includes a timing means,
The information for subtitle broadcast included in the broadcast radio wave selected for reception includes information on a scheduled time of execution of a predetermined process related to reproduction of the information for subtitle broadcast by the reproduction means,
The detecting means acquires time information timed by the time measuring means at the time of execution of a predetermined process by the reproducing means, and the processing load is based on a difference between the acquired time and the scheduled time. The digital broadcast receiving apparatus according to claim 1, wherein the size of the digital broadcast is detected. Recognizing means for recognizing a change in the type of information to be reproduced by the reproducing means;
2. The digital broadcast receiving apparatus according to claim 1, wherein the control unit cancels the reproduction content change when the recognizing unit recognizes a change in the type of information to be reproduced after the reproduction content is changed. .   2. The digital broadcast receiving apparatus according to claim 1, further comprising notifying means for notifying the playback content when the control means starts changing. Receiving channel selection means for receiving and selecting broadcast radio waves;
Reproduction means for reproducing the video information included in the broadcast radio wave selected for reception, information for data broadcasting independent of the video information, and information for subtitle broadcasting,
Control means for controlling the reproduction means so that the various processes related to reproduction of the information for subtitle broadcasting are executed with priority over the various processes related to reproduction of the information for data broadcasting. A digital broadcast receiver characterized by the above.

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