JP2014107578A - Digital broadcast receiver and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a digital broadcast receiver which can be switched from broadcast in a layer currently being received to broadcast in other layer only when a determination is made that the broadcast can be received appropriately based on the decode error occurrence rate of broadcast in a layer of switching destination, while suppressing power consumption by not performing the decoding at an unnecessary timing.SOLUTION: When the decode error occurrence rate of high layer broadcast goes above a first threshold during reception of high layer broadcast, a low layer broadcast decode unit starts decoding of low layer broadcast, and determines whether or not the decode error occurrence rate of low layer broadcast is less than a second threshold. When a determination is made that the decode error occurrence rate of low layer broadcast is less than a second threshold, low layer broadcast is output.

Description

  The present invention relates to a digital broadcast receiver and the like.

  In recent years, devices capable of receiving both high-level broadcasts and low-level broadcasts are known as digital broadcast receiving devices. For example, in the case of digital terrestrial television broadcasting (ISDB-T), digital broadcasting is divided into 13 segments. In the case of digital terrestrial television broadcasting, high-layer broadcasting transmitted using 12 segments and low-layer broadcasting transmitted using one segment are included.

  Here, high-layer broadcasting can provide high-quality content (for example, high-resolution video), but is vulnerable to changes in the reception environment. On the other hand, low-layer broadcasting provides low-quality (for example, low-resolution video), but is characterized by being resistant to changes in the reception environment.

  In the case of a receiving apparatus that can receive both high-level broadcasts and low-level broadcasts, it is possible to switch and display images according to reception sensitivity. In this case, since it is difficult to determine the presence or absence of noise, it is difficult to switch at an appropriate timing of the user.

  Therefore, for example, high-level broadcast and low-level broadcast are demodulated at the same time, and when the error correction rate of each layer exceeds a predetermined threshold, the video of each layer is displayed in parallel and the video to be viewed is selected by the user The invention to be made is known (for example, refer to Patent Document 1).

Patent No. 4792157

  However, the above-described method of Patent Document 1 has a problem that unnecessary power consumption occurs because it is necessary to always operate the decoding of each layer in parallel.

  Further, according to the method of Patent Document 1 described above, when the error correction rate of each layer exceeds a predetermined threshold, the image of each layer is displayed. When based on the error correction rate, the error correction rate is not bad, but there are cases where decoding is not successful. In such a case, even if it is determined that “it is correctly received”, if the content is output, it may not be displayed correctly because it includes noise and the like, and unnecessary switching destination candidate content is displayed. There was a problem.

  In view of the above-described problems, the present invention aims at appropriately switching from a broadcast of a currently received layer to a broadcast of another layer based on the decoding error occurrence rate of the broadcast of the layer of the switching destination. It is possible to switch only when it is determined that it can be received at the same time, and to realize a digital broadcast receiving apparatus or the like that can reduce power consumption by not performing decoding at unnecessary timing.

In order to solve the above problems, the digital broadcast receiving apparatus of the present invention provides:
A tuner unit that receives digital broadcasts including high-level broadcasts and low-level broadcasts;
A separation unit that separates and outputs high-level broadcasts and low-level broadcasts;
A high-level broadcast decoding unit that can decode the high-level broadcast and calculate the decoding error rate,
A low-level broadcast decoding unit that can decode the low-level broadcast and calculate the decoding error rate,
A decoding control unit for controlling to start and output decoding of high-level broadcasting by the high-level broadcasting decoding unit;
Have
The decode control unit
A determination unit configured to start decoding of a low-layer broadcast when the decode error occurrence rate of the high-layer broadcast is equal to or higher than a first threshold and determine whether the decode error occurrence rate of the low-layer broadcast is equal to or lower than a second threshold; ,
When the determination unit determines that the decoding error occurrence rate of the low layer broadcast is equal to or less than the second threshold, control is performed to output the low layer broadcast.

The program of the present invention
A tuner unit that receives digital broadcasts including high-level broadcasts and low-level broadcasts;
A separation unit that separates and outputs high-level broadcasts and low-level broadcasts;
A high-level broadcast decoding unit that can decode the high-level broadcast and calculate the decoding error rate,
A low-level broadcast decoding unit that can decode the low-level broadcast and calculate the decoding error rate,
A decoding control unit for controlling to start and output decoding of high-level broadcasting by the high-level broadcasting decoding unit;
On a computer with
A determination function for starting decoding of a low layer broadcast when the decode error occurrence rate of the high layer broadcast is equal to or greater than a first threshold and determining whether the decode error occurrence rate of the low layer broadcast is equal to or less than a second threshold; Prepared,
When the determination function determines that the decoding error occurrence rate of the low-layer broadcast is equal to or less than the second threshold, the control function for outputting the low-layer broadcast is realized.

  The digital broadcast receiving apparatus according to the present invention enables a low-level broadcast when a high-level broadcast decode error rate is equal to or higher than a first threshold when the high-level broadcast decoding unit is decoding the high-level broadcast. Decoding is started, and it is determined whether the decoding error rate of the low-level broadcast is equal to or lower than the second threshold. Then, when it is determined that the decoding error occurrence rate of the low layer broadcast is equal to or less than the second threshold, the low layer broadcast is output. As a result, the digital broadcast receiving apparatus with reduced power consumption can be provided by decoding the low-level broadcast only when the high-level broadcast is not properly decoded. Furthermore, since the decoded video is output only when the decoding error occurrence rate of the low-level broadcast is determined to be equal to or lower than the second threshold, it is possible to prevent content (video) that has not been decoded correctly from being output. it can.

  In addition, the digital broadcast receiving apparatus of the present invention has a high-level decoding when the low-level broadcast decoding error rate is equal to or lower than the first threshold when the low-level broadcast decoding unit is decoding the low-level broadcast. Hierarchical broadcast decoding is started, and it is determined whether the decoding error occurrence rate of the high hierarchical broadcast is equal to or lower than the second threshold. When it is determined that the decoding error occurrence rate of the low layer broadcast is equal to or less than the second threshold, the high layer broadcast is output. As a result, the high-level broadcast is decoded only when the high-level broadcast is appropriately decoded, and a digital broadcast receiving apparatus with reduced power consumption can be provided. Furthermore, since the decoded content is output only when the decoding error occurrence rate of the high-level broadcast is determined to be equal to or less than the second threshold, it is possible to prevent content (video) that has not been correctly decoded from being output. it can.

It is a functional block diagram of the digital broadcast receiver in this embodiment. It is an operation | movement flow for demonstrating the process in 1st Embodiment. It is an operation | movement flow for demonstrating the operation example in 1st Embodiment. It is an operation | movement flow for demonstrating the process in 2nd Embodiment. It is an operation | movement flow for demonstrating the operation example in 2nd Embodiment. It is an operation | movement flow for demonstrating the operation example in 3rd Embodiment. It is an operation | movement flow for demonstrating the operation example in 4th Embodiment.

  Hereinafter, an embodiment when the digital broadcast receiving apparatus of the present invention is applied will be described. The digital broadcast receiving apparatus described in the present embodiment is an apparatus that can receive high-level broadcast (for example, 12-segment video) and low-level broadcast (for example, one-segment video) from digital broadcast.

[1. First Embodiment]
[1.1 Functional configuration]
First, the functional configuration of the digital broadcast receiving apparatus 1 in the first embodiment will be described with reference to FIG. The digital broadcast receiving apparatus 1 includes a tuner unit 10, a demultiplexer unit 20, a decode control unit 30, a high layer broadcast decode unit 40, a low layer broadcast decode unit 50, an output video creation unit 60, and a video output unit. 70, a control unit 100, and a storage unit 110.

  The tuner unit 10 is a functional unit for receiving a broadcast wave of a program that broadcasts broadcast content desired by a user and outputting a TS (Transport Stream). The output TS is input to the demultiplexer unit 20.

  The demultiplexer unit 20 acquires each ES in the TS, and separates and outputs each ES. In the present embodiment, high-level broadcast ES (for example, 12-segment broadcast ES) and low-layer broadcast ES (for example, 1-segment broadcast ES) are separated and output.

  The high-level broadcast decoding unit 40 and the low-level broadcast decoding unit 50 are functional units for decoding the ES input from the demultiplexer unit 20 and decoding video data, audio data, and character data. The video data and character data are output to the output video creation unit 60, and the audio data is output to the audio output unit (not shown). Further, the high layer broadcast decoding unit 40 decodes the high layer broadcast ES, and the low layer broadcast decode unit 50 decodes the low layer broadcast ES.

  Also, the high-layer broadcast decoding unit 40 and the low-layer broadcast decoding unit 50 calculate the decoding error occurrence rate when decoding the ESs.

  Here, the decoding error occurrence rate refers to the number of errors in units of decoding frames (frames output by the encoder during encoding) per unit time.

  The decoded frame is obtained from an ES (Elementary Stream) to be viewed in a broadcast TS (Transport Stream).

  If a defect occurs in the received TS due to deterioration of the broadcast wave reception status, an error occurs in the decoding frame to be decoded as a result.

  By counting this as a decoding error, a decoding error occurrence rate per unit time can be calculated.

  It should be noted that the decode frame can be checked for errors by checking “decode frame header validity”, “decode frame length”, and “CRC validity described in the decode frame”. Although possible, the method is not limited to this.

  In this embodiment, the decoding error occurrence rate is used as an example for determining whether or not the program to be viewed can withstand viewing. However, other parameters may be used for the determination method.

  For example, it is conceivable that even when a PCR (Program Clock Reference) that is periodically sent to confirm the timing for playing back the decoded sound cannot be received for a certain period of time, the decoding target program cannot be played back with a quality that can withstand viewing.

  In this case, it is possible to determine whether or not the viewing target program can withstand viewing by providing a threshold for the continuity of PCR, such as the number of PCRs confirmed in a certain time.

  The decoding control unit 30 determines whether each decoding unit (the high layer broadcasting decoding unit 40 or the low layer broadcasting decoding unit 50) is based on the decoding error occurrence rate acquired from the high layer broadcasting decoding unit 40 and the low layer broadcasting decoding unit 50. It is a functional part for controlling execution / stop.

  The output video creation unit 60 is a functional unit that creates video data to be output to the video output unit 70 in accordance with the notification content from the decode control unit 30. In the present embodiment, “output the output of the high-level broadcast decoding unit 40 to the video output unit 70”, “output the output of the low-level broadcast decoding unit 50 to the video output unit 70”. It is possible to perform an operation of “combining the outputs of the high-layer broadcast decoding unit 40 / low-layer broadcast decoding unit 50 and outputting them to the video output unit 70”.

  The video output unit 70 is a functional unit for outputting the video data input from the output video creation unit 60. For example, a display device such as a liquid crystal display may be provided and output to the display device, or may be displayed on another display device connected by HDMI or the like.

  The control unit 100 is a functional unit for controlling the entire digital broadcast receiving apparatus 1. The control unit 100 implements various functions by reading and executing various programs stored in the storage unit 110, and is configured by, for example, a CPU (Central Process Unit).

  The storage unit 110 is a functional unit that stores various programs and various data necessary for the operation of the digital broadcast receiving apparatus 1. The storage unit 110 includes, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like.

[1.2 Process flow]
Next, the flow of processing in the first embodiment will be described with reference to FIG. FIG. 2 shows processing executed when the digital broadcast receiving apparatus 1 is viewing a high-level broadcast.

  First, it is determined whether or not the decoding error occurrence rate of the high-level broadcast is equal to or higher than the threshold value a (step S102). Here, when the decoding error occurrence rate is less than the threshold value a, viewing of the high-level broadcast is continued.

  Further, the threshold value in the present embodiment is a value that can maintain a constant viewing quality in high (low) layer broadcasting. There are various items that can be considered as a certain level of viewing quality. For example, from "the occupancy ratio of (block) noise that can occur on the viewing screen per unit time" or "the number of frames that drop frames per unit time" This is a calculated value. For example, when using an occupancy ratio of (block) noise that can occur on the viewing screen per unit time, the threshold may be set to “5%” or the like.

  Note that the threshold value used in the present embodiment is predetermined, but may be adjusted by a user, for example. Moreover, it is good also as changing according to the environment (For example, environment, such as a movement, indoors, the outdoors, and the area) of a digital broadcast receiver. In this case, threshold values (for example, threshold value a to threshold value d including those to be described later) are stored in the storage unit 110 and updated as appropriate.

  Further, when the decoding error occurrence rate is equal to or higher than the threshold value a (step S102; Yes), that is, when a decoding error occurs due to reception sensitivity degradation or the like while viewing the high-layer broadcast, the low-layer broadcast is decoded. Start (step S104).

  Subsequently, it is determined whether or not the decoding rate of the low-level broadcast is equal to or less than the threshold value b (step S106). Here, when the low layer broadcast decoding error occurrence rate is larger than the threshold value b, since the decoding is not correctly performed not only in the high layer broadcast but also in the low layer broadcast, the superimposed display is not performed at this time. The threshold value b is a value (for example, “3%”) at which it is determined that the low-level broadcast can be appropriately output (decoded).

  When the low-layer broadcast decoding error occurrence rate becomes equal to or less than the threshold value b (step S106; Yes), the low-layer broadcast video is synthesized and displayed on the high-layer broadcast video, for example, superimposed (step S108). Here, the user selects which broadcast is to be decoded from the superimposed display state.

  When the user selects the low-level broadcast (step S110; Yes), the low-level broadcast is displayed on the full screen (step S112), and the decoding of the high-level broadcast is stopped (step S114).

  On the other hand, when the high layer broadcast is selected (step S110; No), the decoding of the low layer broadcast is stopped (step S116), and the superimposed display is stopped (step S118). It should be noted that step S116 and step S118 may be reversed.

[1.3 Example of operation]
Subsequently, an operation example will be described with reference to FIG. FIG. 3A is a diagram illustrating an example of a state in which high-layer broadcasting is received. FIG. 3A shows a state in which high-level broadcasting is output (displayed), but the video is disturbed due to a decrease in reception sensitivity.

  At this time, decoding of the low-layer broadcast is started, and when the decoding error occurrence rate of the low-layer broadcast is equal to or less than the threshold value b, the low-layer broadcast is superimposed on the display of the high-layer broadcast and displayed in a small screen (FIG. 3B). ).

  At this stage, for example, when the user selects a low-level broadcast, the low-level broadcast is displayed on the full screen (FIG. 3C). At this time, decoding of the high-level broadcast is stopped.

  Here, various methods are conceivable as selection methods for high-layer broadcasting and low-layer broadcasting. For example, when the display screen is constituted by a touch panel, the broadcast screen may be touched (tapped). Further, it may be selected by an input device such as a remote control device, a keyboard, a mouse, or the like.

  Moreover, it is good also as a structure by which either broadcast is automatically selected when predetermined time passes. For example, when a predetermined time has elapsed, the low-level broadcast may be automatically selected, or conversely, the selection of the low-level broadcast may be canceled (the high-level broadcast is selected).

[1.4 Effect]
As described above, according to the present embodiment, when a high-level broadcast cannot be properly decoded during reception / decoding of the high-level broadcast, the low-level broadcast can be superimposed and displayed. At this time, by using the decoding error occurrence rate of the low-level broadcast, when the low-level broadcast cannot be decoded properly, the superimposed display is not performed, so that the digital broadcast receiving apparatus is highly convenient for the user. .

  In addition, since the decoding process of the low-level broadcast is executed only when the high-level broadcast cannot be properly decoded, it becomes possible to suppress the decoding process at unnecessary timing and to reduce power consumption. Become.

[2. Second Embodiment]
[2.1 Process flow]
Next, the second embodiment will be described. In the second embodiment, the functional configuration of the digital broadcast receiving apparatus 1 is the same as that of the first embodiment. The second embodiment is an embodiment for explaining the operation in the case of viewing (decoding) a low-level broadcast.

  When the low-layer broadcast is being received, if the low-layer broadcast decode error rate is equal to or less than the threshold value c (step S202; Yes), the decoding of the high-layer broadcast is started (step S204). Here, the threshold value c is a value at which low-layer broadcasting can be sufficiently decoded, that is, a value determined that there is a high possibility that high-layer broadcasting can be appropriately decoded (output) because the reception environment is good (for example, “ 1% ").

  Here, when the high layer broadcast decoding error occurrence rate is larger than the threshold value d, the process waits until the high layer decoding error occurrence rate becomes equal to or less than the threshold value d (Step S206; No → Step S216; No → Step S206). Here, the threshold value d is a value (for example, “5%”) at which it is determined that the high-level broadcast can be appropriately decoded (output).

  If the decoding error occurrence rate of the high layer broadcast does not become the threshold value d or less even after receiving for a predetermined time, the decoding of the high layer broadcast is stopped, and the process returns to step S202 to execute the process (step S206; No → step S216). ; Yes-> step S218-> step S202). As a result, power consumption can be reduced when high-level broadcasting cannot be decoded properly for a predetermined time.

  When the decoding error occurrence rate of the high-level broadcast is equal to or lower than the threshold value d (step S206; Yes), the high-level broadcast video is synthesized and superimposed on the low-level broadcast video (step S208). Here, when the high-level broadcast is selected (step S210; Yes), the high-level broadcast is fully displayed (step S212), and the decoding of the low-level broadcast is stopped (step S214).

  On the other hand, when the low hierarchy broadcast is selected (step S210; No), the decoding of the high hierarchy broadcast is stopped (step S220), and the superimposed display of the high hierarchy broadcast is stopped (step S222). Note that the operations in steps S220 and S222 may be reversed.

[2.2 Example of operation]
Next, an operation example will be described with reference to FIG. FIG. 5A is a diagram illustrating an example of a state in which a low-level broadcast is received.

  At this time, when the decoding error occurrence rate of the low layer broadcast is equal to or less than the threshold value c, that is, when the reception status of the low layer broadcast is improved, the decoding of the high layer broadcast is started. Then, when the decoding rate of the high-layer broadcast is equal to or less than the threshold value d, the low-layer broadcast is superimposed on the display of the high-layer broadcast (FIG. 5B).

  At this stage, for example, when the user selects a high hierarchy broadcast, the high hierarchy broadcast is displayed on the full screen (FIG. 5C). At this time, decoding of the low-level broadcast is stopped.

  Various methods can be considered as a method for selecting each hierarchical broadcast. For example, when the display screen is configured by a touch panel, the broadcast may be touched (tapped), or may be selected by an input device such as a remote control device, a keyboard, or a mouse.

  Moreover, it is good also as a structure by which either broadcast is automatically selected when predetermined time passes. For example, when a predetermined time elapses, the high hierarchy broadcast may be automatically selected, or conversely, the selection of the high hierarchy broadcast may be canceled (the low hierarchy broadcast is selected).

[2.3 Effects]
As described above, according to the present embodiment, since the reception status of the low-level broadcast is suitable while the low-level broadcast is being received, the high-level broadcast is synthesized when it is expected that the high-level broadcast can be received. Can be displayed. At this time, by using the decoding error occurrence rate of the high-level broadcast, if the high-level broadcast cannot be decoded properly, the composite display is not performed, so that the digital broadcast receiving apparatus is highly convenient for the user. .

[3. Third Embodiment]
Subsequently, the third embodiment will be described. In the above-described embodiment, the case of performing sub-screen display (superimposed display) has been described. However, the third embodiment is an embodiment in which an identification display or the like is synthesized and displayed instead of a video of a switching destination hierarchy.

  Here, the functional configuration and processing in the third embodiment are the same as those in the first embodiment and the second embodiment. However, on the output screen, it is assumed that the hierarchy is switched by displaying the broadcast (video) having a different hierarchy without displaying the synthesized (superimposed) display.

  That is, for example, if a high-level broadcast is being displayed, in step S108 in FIG. 2, instead of superimposing and displaying the low-level broadcast on the high-level broadcast, an identification display indicating that switching to the low-level broadcast is possible is performed. Further, if the low-level broadcast is being displayed, in step S208 in FIG. 4, instead of displaying the high-level broadcast superimposed on the low-level broadcast, an identification display indicating that the high-level broadcast can be switched is displayed.

  Specifically, as shown in FIG. 6A, a high-level broadcast is output (decoded), but the video is disturbed due to a decrease in reception sensitivity. Here, decoding of the low layer broadcast is started, and when the decoding error occurrence rate of the low layer broadcast is equal to or less than the threshold value b, it is identified and displayed that the low layer broadcast can be received (M100 in FIG. 6B).

  When the identification display is made, the user can switch to the lower layer broadcast because it can be switched to the lower layer broadcast (the decoding error occurrence rate of the high layer broadcast is high and cannot be decoded properly). (Fig. 6 (c)).

  As described above, according to the present embodiment, when it is detected that the high-level broadcast cannot be properly output, the identification display is performed without performing the composite display when the switching to the low-level broadcast is effective. This makes it possible to notify the user.

  A superimposed display such as a child screen may occupy most of the viewing screen, which may interfere with viewing. In such a case, the identification display can be used to notify the user that the viewing screen can be switched at an appropriate timing without disturbing the viewing screen. In particular, it is effective in an apparatus in which the size of the display screen is limited, such as a mobile phone including a smartphone.

  In this embodiment, an example of switching to a low-layer broadcast while receiving a high-level broadcast (during display) has been described, but when switching to a high-level broadcast can be performed while receiving a low-level broadcast (during display) Can also be identified and displayed.

[4. Fourth Embodiment]
Next, a fourth embodiment will be described. In addition to the embodiment described above, an operation for explicitly canceling the operation for switching the hierarchy is added.

  For example, as shown in FIG. 7A, it is assumed that the reception status is improved and the high-level broadcast is superimposed and displayed during reception (display) of the low-level broadcast (FIG. 7B). In this case, a cancel display is displayed on the display screen. When cancel is selected by the user, the reception of the high-level broadcast is explicitly stopped, and the low-level broadcast is continuously received (FIG. 7C).

  As described above, according to the present embodiment, when it is desired to continuously receive the low-level broadcast, the low-level broadcast can be continuously received by selecting the cancel operation. For example, after performing the cancel operation, low-level broadcast may be continuously received for a predetermined time, or low-level broadcast may be continuously received during the same channel.

  In this embodiment, an example of switching to a high-level broadcast while receiving (displaying) a low-level broadcast has been described. However, when switching to a low-level broadcast can be performed while receiving (displaying) a high-level broadcast. Can also be identified and displayed.

[5. Modified example]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

  Note that the digital broadcast receiving apparatus of the above-described embodiment is applicable as long as it can receive digital broadcasts such as a mobile phone including a smartphone, a tablet, a car navigation system, a TV, and a computer.

  Further, in the above-described embodiment, the decoding error occurrence rate is adopted as a trigger as the hierarchy switching, but the switching may be performed using other criteria. For example, tuner reception sensitivity, BER (Bit Error Rate), PER (Packet Error Rate) of received data, or the like may be used.

  In the above-described embodiments, each embodiment (the first embodiment and the second embodiment) has been described independently. However, it is needless to say that the embodiments may operate continuously. For example, in the first embodiment, the high hierarchy broadcast is switched to the low hierarchy broadcast while viewing. Then, an operation of switching to a higher hierarchy broadcast while viewing the lower hierarchy broadcast may be performed.

  As a result, for example, when the reception environment fluctuates due to movement, it is possible to view (receive) a high-level broadcast as much as possible, and always

  In the above-described embodiment, a screen having a layer different from the layer currently being received has been described as being superimposed on the child screen. However, for example, the screen may be displayed using a divided screen. That is, it is only necessary to be able to confirm the screen to which the user switches.

  In addition, the program that operates in each device in the embodiment is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments. Information handled by these devices is temporarily stored in a temporary storage device (for example, RAM) at the time of processing, then stored in various ROM or HDD storage devices, and read and corrected by the CPU as necessary. • Writing is performed.

  Here, as a recording medium for storing the program, a semiconductor medium (for example, ROM, a non-volatile memory card, etc.), an optical recording medium / a magneto-optical recording medium (for example, a DVD (Digital Versatile Disc), MO (Magneto Optical), etc. Disc), MD (Mini Disc), CD (Compact Disc), BD, etc.), magnetic recording medium (for example, magnetic tape, flexible disk, etc.), etc. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.

  In addition, when distributing to the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, of course, the storage device of the server computer is also included in the present invention.

  In addition, a part or all of each device in the above-described embodiments may be realized as an LSI (Large Scale Integration) that is typically an integrated circuit. Each functional block of each device may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, it is of course possible to use an integrated circuit based on this technology.

1: Digital broadcast receiver 10: Tuner unit 20: Demultiplexer unit 30: Decode control unit 40: High layer broadcast decode unit 50: Low layer broadcast decode unit 60: Output video creation unit 70: Video output unit 100: Control unit 110 : Storage unit

Claims (5)

A tuner unit that receives digital broadcasts including high-level broadcasts and low-level broadcasts;
A separation unit that separates and outputs high-level broadcasts and low-level broadcasts;
A high-level broadcast decoding unit that can decode the high-level broadcast and calculate the decoding error rate,
A low-level broadcast decoding unit that can decode the low-level broadcast and calculate the decoding error rate,
A decoding control unit for controlling to start and output decoding of high-level broadcasting by the high-level broadcasting decoding unit;
Have
The decode control unit
A determination unit configured to start decoding of a low-layer broadcast when the decode error occurrence rate of the high-layer broadcast is equal to or higher than a first threshold and determine whether the decode error occurrence rate of the low-layer broadcast is equal to or lower than a second threshold; Prepared,
A digital broadcast receiving apparatus that performs control to output a low-layer broadcast when the determination unit determines that a decoding error occurrence rate of the low-layer broadcast is equal to or less than a second threshold value. The decode control unit
The digital broadcast receiving apparatus according to claim 1, wherein the low-level broadcast is combined with the high-level broadcast and output. The decoding control unit starts decoding the high-level broadcast when the low-level broadcast decoding error occurrence rate is equal to or lower than a third threshold during the output of the low-level broadcast,
The determination unit determines whether the decoding error rate of the high-level broadcast is a fourth threshold value or less;
3. The digital according to claim 1, wherein, when the determination unit determines that the decoding error occurrence rate of the high layer broadcast is equal to or less than a fourth threshold value, control for outputting the high layer broadcast is performed. Broadcast receiving device. The decode control unit
4. The digital broadcast receiving apparatus according to claim 3, wherein if the decoding error occurrence rate of the low layer broadcast is not determined to be equal to or less than the second threshold even after a predetermined time has elapsed, the decoding of the high layer broadcast is stopped. . A tuner unit that receives digital broadcasts including high-level broadcasts and low-level broadcasts;
A separation unit that separates and outputs high-level broadcasts and low-level broadcasts;
A high-level broadcast decoding unit that can decode the high-level broadcast and calculate the decoding error rate,
A low-level broadcast decoding unit that can decode the low-level broadcast and calculate the decoding error rate,
A decoding control unit for controlling to start and output decoding of high-level broadcasting by the high-level broadcasting decoding unit;
On a computer with
A determination function for starting decoding of a low layer broadcast when the decode error occurrence rate of the high layer broadcast is equal to or greater than a first threshold and determining whether the decode error rate of the low layer broadcast is equal to or less than a second threshold; ,
When the determination function determines that the decoding error occurrence rate of the low layer broadcast is equal to or lower than the second threshold, an output function for outputting the low layer broadcast;
A program to realize

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