JP2010239297A - Digital broadcast receiver, control method thereof and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a processing load, while maintaining information perfectness, when re-multiplexing data broadcast after reception. <P>SOLUTION: A digital broadcast receiver 100 receives digital broadcast, demultiplexes the digital broadcast into transport streams and then multiplexes them. When a load state of the device becomes high and there are a plurality of elementary streams of data broadcast to be transmitted, according to a carousel method in transport streams contained in the digital broadcast, data acquisition is limited by a filter 103 for partial elementary streams; and after the lapse of a predetermined time, for non-acquired elementary streams, data are acquired from retransmitted data according to the carousel method. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving apparatus, a control method thereof, and a program, and more particularly to a load reduction technique in an apparatus that executes remultiplexing processing on multiplexed data including a stream transmitted by a carousel method.

  Among documents already known at the time of filing of the present invention, Patent Documents 1 and 2 are cited as documents related to the present invention.

  Patent Document 1 discloses a data transfer device that receives and transfers multiplexed data such as digital broadcasts, and minimizes the load on a CPU (central processing unit) to separate the data. A multiplex data transfer device whose problem is to reduce the scale is described. The present invention is related to the point of reducing the processing load in an apparatus for receiving and transferring multiplexed data such as digital broadcasting.

  Patent Document 2 discloses that a digital broadcast receiver in which a data broadcast is superimposed on a main broadcast correctly reproduces the data of the data broadcast when a special playback operation such as pause, fast forward playback, or rewind playback of the main broadcast is performed. Describe techniques to remedy problems that may not be possible.

  The technology described in Patent Document 2 collects data broadcast data that is normally transmitted or stored in a carousel system separately from audio and video streams by a filter and reproduces an event that occurred in the data broadcast. Decode (paragraph 0031). Also, module data is composed of data broadcast data (a plurality of packet data) (paragraphs 000037-0044).

JP 2003-204511 A JP 2006-261863 A

  As in the above-mentioned Patent Document 1, in an apparatus for receiving and transferring multiplexed data such as digital broadcasting, the multiplexed data is received, separated, and recompressed with respect to the separated various data. After performing, the process of multiplexing and transferring again is performed. The reason why the re-multiplexing process is performed by reducing the data amount in this way is that the load required for the transfer process is reduced and that the multiplexed data after the transfer is easily handled. This re-multiplexing process is used not only when transferring received data but also when performing so-called “n-times recording”, for example.

  However, the remultiplexing process is very burdensome. When the processing capability of the CPU of the apparatus is low, the load or a delay of the entire system due to the load occurs. In the case of a system that transfers data after re-multiplexing processing, data transmission to the transfer destination cannot catch up with data reproduction, causing problems such as video clipping and audio interruption.

  Among the above remultiplexing processes, the load on the processing of video and audio data is large, but there are cases where it is solved by using a dedicated hardware decoder / encoder. On the other hand, a remultiplexing process for data broadcasting included in digital broadcasting rarely uses a dedicated CPU. Therefore, when the processing capability is low, there is a possibility that a problem due to a high load occurs. As a method for solving this problem, a method of discarding an ES (Elementary Stream: hereinafter referred to as “data ES”) of data broadcasting is conceivable, but there is a problem that information integrity cannot be maintained.

  The present invention has been made in view of the above circumstances, and a digital broadcast receiving apparatus that realizes a reduction in processing load while maintaining the integrity of information when data data is remultiplexed after reception, and control thereof An object is to provide a method and a program.

  In order to achieve the above object, the following invention is provided.

  A digital broadcast receiving apparatus according to the present invention decodes a transport stream included in a digital broadcast and separates the transport stream into a stream transmitted by a carousel method and another stream, and data of the other stream A transcoder that performs processing to compress the amount, a filter that performs processing to compress the data amount of the stream transmitted by the carousel method, the other stream that has been compressed, and a stream that is transmitted by the carousel method. Multiplexing processing means for performing the multiplexing processing, load monitoring means for monitoring the load of the multiplexing processing, and filter control means for controlling the filter in accordance with the monitoring result of the load monitoring means, Stream transmitted by the carousel method Define the priority of the stream, characterized in that it comprises a filter for compressing data amount by not performing the data acquisition and low priority stream as restricted.

  A control method of a digital broadcast receiving apparatus according to the present invention includes a transport stream decoder that decodes a transport stream included in a digital broadcast and separates the stream into a stream transmitted by a carousel method, and the other stream. A control method for a digital broadcast receiving apparatus, comprising: a transcoder that performs a process of compressing a data amount of a stream; and a multiplexing processing unit that performs a multiplexing process on the compressed other stream. A load monitoring step for monitoring a load; and a filter control step for controlling a filter for performing a process of compressing a data amount of a stream transmitted by the carousel method according to a monitoring result by the load monitoring step, The filter is a stream transmitted by the carousel method. Define the priority of the stream, characterized in that it comprises a filter for compressing data amount by not performing the data acquisition and low priority stream as restricted.

  The program according to the present invention decodes a transport stream included in a digital broadcast, separates the transport stream transmitted by the carousel method into other streams, and compresses the data amount of the other streams. A load monitoring process for monitoring a load of the multiplexing process in a digital broadcast receiving device having a transcoder for performing the process to be performed, and a multiplexing processing means for multiplexing the compressed other stream, and the load And a filter control process that controls a filter that performs a process of compressing a data amount of a stream transmitted by the carousel method according to a monitoring result by the monitoring process, and the filter is transmitted by the carousel method. Prioritize the stream, and , Characterized by the filter including a filter for compressing data amount by not performing the data acquisition and low priority stream as restricted.

  According to the present invention, it is possible to reduce the processing load while maintaining the integrity of information when data data is remultiplexed after reception.

It is a block diagram which shows the principal part structure of the digital broadcast receiver which concerns on embodiment by this invention. It is a conceptual diagram which shows the image of the data acquisition restriction | limiting by filter control in this embodiment. It is a conceptual diagram which shows on the time-axis the image from which one data ES in this embodiment becomes a data acquisition object or a restriction | limiting object. It is an activity diagram which shows the whole operation | movement of the digital broadcast receiver which concerns on this embodiment. FIG. 5 is a sub-activity diagram of the filter control process of FIG. 4. It is a figure which shows an example of the change transition of the limit data by the filter control process which concerns on the said embodiment.

  Hereinafter, embodiments of the present invention will be described in detail.

FIG. 1 shows a main configuration of a digital broadcast receiver 100 according to the present embodiment.
As illustrated, the digital broadcast receiver 100 includes a TS decoder 101, a transcoder 102, a filter 103, a multiplexer 104, a multiplexing processing buffer 105, a filter control unit 106, and a buffer monitoring unit 107.

  The digital broadcast receiver 100 according to the present embodiment decodes and separates each transport stream (hereinafter, also referred to as “TS”) included in a digital broadcast wave received by a receiving unit (not shown) by the TS decoder 101. The video PES (Packetized Elementary Stream) packet and the audio PES packet are input to the transcoder 102, and other PES packets, PSI (Program Specific Information) information, and the like are input to the filter 103.

FIG. 2 shows an image of data acquisition restriction by filter control in the present embodiment.
As shown in the figure, an elementary stream (hereinafter, sometimes referred to as “ES”) of a certain channel (service) is time-divided and transmitted separately in a broadcast wave. Each TS decoder 101 in FIG. Separated.

  The video ES and audio ES input to the transcoder 102 are input to the multiplexer 104 after being subjected to compression processing such as lowering the bit rate. Similarly, a packet or the like input to the filter 103 is input to the multiplexer 104 after being subjected to processing for reducing (compressing) the data amount. An image of these processes is shown in the center of FIG.

The multiplexer 104 performs a process of multiplexing each input elementary stream again to form a transport stream. The right part of FIG. 2 shows an image of this processing.
The multiplexer 104 uses the multiplexing processing buffer 105 as a temporary storage unit (buffer) when executing the multiplexing processing.

The buffer monitoring unit 107 monitors the data amount (data buffer) of the multiplexing processing buffer 105 and measures the processing load state. For monitoring the amount of data, for example, the buffer usage is monitored at a rate of 100 minutes. Further, the buffer monitoring unit 107 always transmits the monitoring result to the filter control unit 106.
The filter control unit 106 controls the filter 103 according to the monitoring result of the buffer monitoring unit 107.

  The process (filter process) by the filter 103 will be described in more detail. As shown in the central part of FIG. 2, in the filtering process according to the present embodiment, when there are a plurality of data ESs among the input information, first, a priority is determined for each data ES. Next, when the entire digital broadcasting receiver 100 is subjected to a high load due to re-multiplexing processing or the like, the data ES having a low priority is set as a data acquisition restriction target, and the load is reduced. Further, the data multiplexing restriction target ES is switched in a certain time unit to maintain the integrity of information.

  In data broadcasting, a carousel method is generally employed in which the same data is repeatedly broadcast. The carousel data is transmitted as module data compressed in the ZIP format or the like. Accordingly, each data ES obtained by decoding the data broadcast by the TS decoder 101 can be reacquired because the same data is retransmitted after waiting for a certain period.

  FIG. 3 shows, on the time axis, an image in which one data ES in the present embodiment is a data acquisition target or a restriction target. In the example illustrated in FIG. 3, after the data ES becomes a data acquisition target (acquisition period), the data ES becomes a restriction target (restriction period), and then becomes a data acquisition target again.

  In the case of the data acquisition target from the data acquisition target indicated by the symbol A in FIG. 3, the filter control unit 106 detects the high load of the digital broadcast receiver 100 according to the monitoring result of the buffer monitoring unit 107, and This is the case where the acquisition of the data ES is restricted, or the data acquisition of the data acquisition target is completed. In addition, in the case indicated as the reference symbol B from the data acquisition restriction target, the filter control unit 106 determines that the digital broadcast receiver 100 has recovered from the high load state according to the monitoring result of the buffer monitoring unit 107. In this case, the acquisition is resumed, or the acquisition of another data ES is completed. That is, the acquisition of the data ES subject to restriction on data acquisition is stopped when the load is high, and the acquisition is resumed after recovery from the high load state or after the acquisition of another data ES is completed.

  Even if a part of the data has already been acquired, in the re-acquisition, the acquisition state is regarded as the initial state (no acquisition data amount), and acquisition is performed for the maximum retransmission cycle. Since the data ES is transmitted by the data carousel method, if data is acquired during the maximum retransmission period, the data acquisition is guaranteed. In other words, the integrity of the information can be maintained.

  Next, an outline of the procedure of the present embodiment described above will be described with reference to the activity diagram of FIG. FIG. 4 is an activity diagram showing the overall operation of the digital broadcast receiver 100.

  In FIG. 4, the digital broadcast receiver 100 first receives multiplexed data (step S101). Next, the TS decoder 101 performs data analysis and separation processing, and separates data necessary for video, audio, and data broadcasting from the received data (step S102).

  Next, for the data ES, the buffer monitoring unit 107 monitors the amount of data in the multiplexing process of the multiplexing process buffer 105 and measures the processing load state (step S103). In parallel processing, the filter control unit 106 performs filter control based on load monitoring (step S104), and the filter 103 performs filtering (step S105). Specifically, data acquisition is restricted for one or a plurality of data ES at high load. Normal processing is performed at low load.

  Next, the multiplexer 104 performs a process of multiplexing the video ES, the audio ES, and the data ES (step S106). In the present embodiment, the multiplexing process is for reducing the load of the subsequent transfer process (step S107).

  Next, filter control processing according to the present embodiment will be described with reference to the activity diagram of FIG. FIG. 5 is a sub-activity diagram of the filter control process shown in FIG.

  The buffer monitoring unit 107 monitors the multiplexing processing buffer 105 used for multiplexing processing. The filter control unit 106 sets the load state of the digital broadcast receiver 100 to the “high load state” when the buffer size usage state becomes 80%, for example, and when the usage state decreases from that state to 60%, for example. Considered returning from high load.

  In addition, the filter control unit 106 does not restrict reception of the data ES in the initial state. Further, the filter control unit 106 controls the filtering conditions of the filter 103 according to the following cases during monitoring of the multiplexing processing buffer 105.

The first case is a transition from the initial state to the high load state.
The filter control unit 106 sets / changes the filtering condition of the filter 103, that is, the restriction target ES (step S201 in FIG. 5), and sets the data ES having a low acquisition priority as the restriction target. The priority is determined by the size of the component tag in each data ES.

The second case is a transition from a high load state to a low load state.
The filter control unit 106 releases the restriction and starts receiving all data ES (step S203).

The third case is a transition to a high load state.
The filter control unit 106 sets / changes the filtering condition of the filter 103, that is, the restriction target ES (step S201), and stops reception with the data ES having a low priority as the restriction target according to the priority change.

The fourth case is a case where the non-restricted data ES is received continuously for a maximum retransmission period (for example, 180 seconds) or longer.
In this case, the non-restricted data ES is received through the step S202 and the step S204 in FIG. 5 for 180 seconds or more of the maximum retransmission period of the data carousel method. In this case, for the filtering condition, the filter control unit 106 changes the priority of the received data ES to the lowest value to increase the priority of other data ES, and changes the data ES to be restricted (step S205). ).

  An example of the switching transition of the limit data by the filter control process according to the present embodiment is shown in FIG. In FIG. 6A, since three data ES are given priority levels of ES1, 2, and 3 in the initial state, ES3 with the lowest priority is a data acquisition restriction target. ing. In order to facilitate understanding, the maximum retransmission period is set to three blocks in the figure.

  Since each data ES is sent asynchronously, the amount of data that can be acquired in a certain time varies for each data ES. Assume that data in a range surrounded by a dotted line is acquired during the transition from FIG. 6A to FIG.

  In FIG. 6B, since the data for the maximum retransmission period of the data ES2 can be acquired during the transition from FIG. 6A to FIG. 6B, the priority of the data ES2 becomes the lowest value. Therefore, the restriction target moves to the data ES2. Next, it is assumed that data for the maximum retransmission period of the data ES1 is acquired during the transition from FIG. 6 (b) to (c).

  In FIG. 6C, since the data for the maximum retransmission period of the data ES1 can be acquired during the transition from FIG. 6B to FIG. 6C, the priority of the data ES1 becomes the lowest value. Therefore, the restriction target moves to the data ES1. At this time, when the load state becomes a higher load, the already acquired data ES2 may be the restriction target.

  According to the embodiment described above, when the load state of the digital broadcast receiver 100 becomes high, the elementary stream of the data broadcast transmitted by the carousel method among the transport streams included in the digital broadcast. If there are a plurality of elementary streams, the data acquisition of some elementary streams is restricted. Therefore, when re-multiplexing after receiving a data broadcast, the amount of data subject to re-multiplexing can be reduced (data amount compression) with respect to the amount of received data, thus reducing the processing load. To do. In addition, according to the present embodiment, data is acquired from retransmission data by the carousel method for elementary streams that have not been acquired after a predetermined time has elapsed. Therefore, the integrity of information can be maintained.

Next, another embodiment according to the present invention will be described.
In the above description, an embodiment in which all data ES is subjected to filtering processing has been described. However, in this case, there is no guarantee that the data broadcast data that is displayed first when the user presses the d button is included in the transferred data. Therefore, there is a possibility that the responsiveness to the user operation is deteriorated.

  Therefore, regarding the data ES of the component tag 0x40 in which “startup.bml” which is the default component of the data broadcast data is defined, this is not included in the filter processing target. That is, as a modification of the above-described embodiment, in the above-described embodiment, a filter that predetermines that the data ES of the component tag 0x40 is not restricted is added to the filter of the filter 103 in FIG. According to this configuration, it is possible to solve the problem related to the responsiveness.

Furthermore, other embodiments will be described.
In data broadcasting, there is a technique in which a broadcast station transmits an event message in accordance with a video scene and controls a script using the event message as a link with a program. To cope with this, if it is known in advance that a certain data ES includes an event message, the data ES may be excluded from the restriction target. Similar to the embodiment in which a filter for preliminarily defining data ES including a default component is excluded from a restriction target, a filter for preliminarily defining a data ES including an event message as non-restriction target is added.

Furthermore, other embodiments will be described.
In the embodiment described above, an example in which the number of data ESs to be limited by the multiplexing process is one is shown with reference to FIG. However, the present invention is not limited to this, and a plurality of data ES may be restricted at the same time. Also, when multiple data ESs are subject to multiplexing processing restriction at the same time, two data ESs in one timeline, three data ESs in another timeline, or the bit rate of the data are measured and cupped. Changing the ring is advantageous in reducing the load because the total number of packets of each data ES transmitted per unit time is leveled.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the invention.

  For example, the operation (the operation shown in each flowchart) in each of the above-described embodiments can be executed by hardware, software, or a combined configuration of both.

  When executing processing by software, a program in which a processing sequence is recorded may be installed and executed in a memory in a computer incorporated in dedicated hardware. Or you may install and run a program in the general purpose computer which can perform various processes.

  For example, the program can be recorded in advance on a hard disk or a ROM (Read Only Memory) as a recording medium. Alternatively, the program can be stored (recorded) temporarily or permanently in a removable recording medium such as an optical disk, a magnetic disk, or a semiconductor memory. Such a removable recording medium can be provided as so-called package software.

  The program may be wirelessly transferred from the download site to the computer in addition to being installed on the computer from the removable recording medium as described above. Or you may wire-transfer to a computer via networks, such as LAN (Local Area Network) and the internet. The computer can receive the transferred program and install it on a recording medium such as a built-in hard disk.

  In addition to being executed in time series in accordance with the processing operations described in the above embodiment, the processing capability of the apparatus that executes the processing, or a configuration to execute in parallel or individually as necessary Is also possible.

  In addition, the system described in the above embodiment can be configured to have a logical set configuration of a plurality of devices or to mix the functions of each device.

  The present invention can be applied to a system, apparatus (apparatus), method, program, and the like that execute remultiplexing processing on multiplexed data including a stream transmitted by the carousel method.

DESCRIPTION OF SYMBOLS 100 Digital broadcast receiver 101 TS decoder 102 Transcoder 103 Filter 104 Multiplexer 105 Multiplexing process buffer 106 Filter control part 107 Buffer monitoring part

Claims (7)

A digital broadcast receiving apparatus that receives a digital broadcast and multiplexes it after separating it into each transport stream,
If the load status of the device becomes high,
When there are multiple elementary streams of data broadcasting transmitted by the carousel method among transport streams included in digital broadcasting, data acquisition of some elementary streams is restricted, and after a predetermined time has elapsed, A digital broadcast receiving apparatus, wherein elementary streams that have not been acquired are acquired from retransmission data by a carousel method. A transport stream decoder that decodes a transport stream included in the digital broadcast and separates the transport stream into a stream transmitted by the carousel method and another stream;
A transcoder that performs processing to compress the data amount of the other streams;
A filter that performs processing for compressing the data amount of the stream transmitted by the carousel method;
Multiplexing processing means for multiplexing the compressed other stream and the stream transmitted by the carousel method;
Load monitoring means for monitoring the load of the multiplexing process;
Filter control means for controlling the filter according to the monitoring result of the load monitoring means;
Have
The filter includes a filter that sets a priority for a stream transmitted by the carousel method, and compresses a data amount by not acquiring data with a low priority among the streams as a restriction target. A digital broadcast receiver. A multiplexing processing buffer used for the multiplexing processing;
3. The digital broadcast receiving apparatus according to claim 2, wherein the load monitoring unit monitors a data amount of the multiplexing processing buffer and measures a load state of the multiplexing processing.   4. The digital broadcast receiving apparatus according to claim 2, wherein the filter lowers the priority of a stream from which data for the maximum retransmission period of the carousel method is acquired.   5. The filter according to claim 2, wherein the filter includes a filter in which a data elementary stream of a component tag 0x40 is preliminarily excluded from a restriction among streams transmitted by the carousel method. 6. Digital broadcast receiver. A transport stream decoder that decodes a transport stream included in the digital broadcast and separates the transport stream into a stream transmitted by the carousel method and another stream;
A transcoder that performs processing to compress the data amount of the other streams;
A multiplexing processing means for multiplexing the compressed other stream;
A method for controlling a digital broadcast receiving apparatus comprising:
A load monitoring step for monitoring the load of the multiplexing process;
A filter control step of controlling a filter that performs processing for compressing the data amount of the stream transmitted by the carousel method according to the monitoring result of the load monitoring step,
The filter includes a filter that sets a priority for a stream transmitted by the carousel method, and compresses a data amount by not acquiring data with a low priority among the streams as a restriction target. And a control method of the digital broadcast receiving apparatus. A transport stream decoder that decodes a transport stream included in the digital broadcast and separates the transport stream into a stream transmitted by the carousel method and another stream;
A transcoder that performs processing to compress the data amount of the other streams;
A multiplexing processing means for multiplexing the compressed other stream;
In a digital broadcast receiving apparatus having
A load monitoring process for monitoring the load of the multiplexing process;
A filter control process for controlling a filter that performs a process of compressing a data amount of a stream transmitted by the carousel method according to a monitoring result by the load monitoring process;
The filter is a filter including a filter that compresses the amount of data by setting priority to a stream transmitted by the carousel method and not acquiring data with a low priority among the streams as a restriction target. A program characterized by that.

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