JP2011244268A - Broadcast apparatus, broadcast receiver, broadcast method, and broadcast reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast service of an information accumulation type which reduces defects in recorded information and reduces consumption of a transmission capacity (band).SOLUTION: A broadcast apparatus comprises a transmission means which continuously transmits N first broadcast programs in a first time zone and continuously transmits M second broadcast programs in a second time zone. The number N of continuous packets of the first data packets transmitted in the first time zone is set so as to be larger than the number M of continuous packets transmitted in the second time zone.

Description

  Embodiments described herein relate generally to a broadcast complement method that complements data of content data transmitted by broadcasting.

In recent years, provision of an information storage type broadcasting service (broadcasting service by a file casting method) is scheduled.
The information storage type broadcast service is a broadcast service that records (stores) distributed content data and metadata in a storage medium managed by the broadcast receiving apparatus, and permits the recorded content data to be reproduced later. .

  For example, in Japan, provision of an information storage type broadcasting service is scheduled mainly in a broadcasting form called multimedia broadcasting for mobile terminals (hereinafter referred to as multimedia broadcasting). A receiver (portable terminal) assumed in multimedia broadcasting is a form in which a multimedia broadcast receiving function is built in a portable device such as a mobile phone, a mobile PC, or a PDA (Personal Digital Assistant).

  In such an information storage type broadcasting service, if there is a defective part in the received or recorded content, there may be a problem in reproducing the content.

Conventionally, in order to reduce the defects of recorded information as much as possible, there have been considered methods such as using a transmission method that is resistant to transmission errors by an error correction method, or retransmitting the same content multiple times. Yes.

  However, methods such as providing error tolerance with error correction methods or resending the same content multiple times consumes a large amount of transmission capacity (bandwidth) used to transmit the same content. There are disadvantages such as a reduction in the number of contents that can be made.

JP 2007-166674

  As described above, in the error correction method or the like, disadvantages such as consuming a large transmission capacity (bandwidth) and reducing the number of contents that can be provided are expected. Therefore, in the embodiment of the present invention, in the information storage type broadcasting service, it is possible to provide an information storage type broadcasting service that reduces the defect of recorded information while reducing the consumption of transmission capacity (bandwidth). Objective.

According to the embodiment, there is provided broadcasting means for broadcasting data relating to the first broadcast program and the second broadcast program, the N first broadcast programs are repeatedly broadcast in the first time zone, and the second The M second broadcast program is repeatedly broadcast during the time period. The first broadcast program number N broadcasted in the first time zone is set to be larger than the second broadcast program number M broadcasted in the second time zone.

The block diagram which shows the broadcasting apparatus using the file-casting system concerning embodiment. The block diagram which shows the broadcast receiving apparatus using the file-casting system concerning embodiment. Referring to a diagram for explaining a broadcasting method using a file casting method according to the embodiment, a file (program group) to be broadcast is divided into a plurality of groups, a time zone for file casting is also divided into a plurality of time zones, and a certain time zone Explanatory drawing of the system which changes the frequency | count of resending of the group allocated to and the frequency | count of resending of the group allocated to another time slot | zone. FIG. 4 is a diagram for explaining a broadcasting method using the file casting method according to the embodiment, and relates to a coding rate of an error correction code of a group assigned to a certain time zone and an error of a group assigned to another time zone. Explanatory drawing of the system which changes the encoding rate of a correction code. FIG. 4 is a diagram for explaining a broadcasting method using the file casting method according to the embodiment, in which the number of retransmissions of a group assigned to a certain time zone and the number of retransmissions of a group assigned to another time zone are changed. FIG. 4 is an explanatory diagram of a method for changing the number of retransmissions of a program group transmitted through transmission channel 1 and transmission channel 2. FIG. 4 is a diagram for explaining a broadcasting method using a file casting method according to the embodiment, in which a storage state is detected in a specific time zone (daytime), and the power is turned off in a retransmission time zone of a group that has already been stored. Illustration.

Embodiments of the present invention will be described below with reference to the drawings.
<Example 1>
FIG. 1 is a block diagram showing a broadcasting apparatus using a file casting method according to the embodiment.
Reference numeral 11 denotes a broadcast transmission device (content transmission device). Here, an example of the content transmission device 11 on the broadcast station side in the multimedia broadcast service described in this embodiment is shown.

Reference numeral 12 is an input terminal for content for a real-time broadcasting service, reference numeral 13 is an MPEG encoder, reference numeral 15 is a TS processing section, reference numeral 16 is an encryption processing section, reference numeral 17 is a TS multiplexing section, reference numeral 18 is an input terminal, Reference numeral 19 denotes an encryption processing unit, reference numeral 20 denotes a content processing unit, reference numeral 21 denotes a TS conversion processing unit, reference numeral 22 denotes an EPG data generation unit, reference numeral 23 denotes a TS conversion processing unit, reference numeral 24 denotes a transmission path encoding unit, reference numeral 25 Is an output terminal.

Reference numeral 26 is an antenna, reference numeral 27 is an output terminal, reference numeral 28 is a network server (broadcast complement server), reference numeral 29 is an input terminal, reference numeral 30 is a content recording device (HDD), reference numeral 30a is a hard disk, reference numeral 31 is a network interface, reference numeral 32 is an input / output terminal, and 33 is a network.

The content transmission device 11 includes an input terminal 12 to which content (broadcast program) for a real-time broadcast service is input (in a multimedia broadcast service, in addition to a broadcast service using a file casting method, Real-time broadcasting service that allows users to enjoy content in real time without accumulating content is also planned).

  The content input to the input terminal 12 is subjected to compression processing by a moving picture experts group (MPEG) encoder 13 and subjected to PES processing / sectioning processing by a PES (packetized elementary stream) / sectioning processing unit 14. The

Then, TS processing is performed by the TS (transport tsream) processing unit 15, encryption processing is performed by the encryption processing unit 16, and then supplied to the TS multiplexing unit 17.

  In addition, the content transmission device 11 includes an input terminal 18 to which content for a storage-type broadcast service (broadcast service based on a file casting method) is input.

This storable broadcasting service is a service for transmitting content to be automatically stored in a receiving device, which will be described later, by broadcasting, and viewing the content automatically stored by the receiving device at a predetermined timing.

As a result, an information storage type broadcast service (broadcast service based on a file casting method) can be realized.
The content input to the input terminal 18 is previously subjected to an encoding process such as an MPEG compression process, and further subjected to a PES process / section process. Note that the encoding process depends on various contents such as video contents, audio contents, data contents such as games, mixed contents of characters and photographs such as newspaper magazines.

The content is encrypted by the encryption processing unit 19, and the content processing unit 20 performs FLUTE processing, IP (internet protocol) packetization / header compression (ROHC) processing, encapsulation (ULE) processing, and the like.

Further, after the TS process is performed by the TS process unit 21, it is supplied to the TS multiplexer 17.
The content transmission device 11 includes an EPG (electronic program guide) data generation unit 22.
The EPG data generation unit 22 generates program arrangement information such as SI (service information) and PSI (program specific information) for creating an electronic program guide that is a delivery schedule table for content for a real-time broadcasting service. Yes.

In addition, it generates program arrangement information such as SI (service information) and PSI (program specific information) that are also used to create a distribution schedule (repeated distribution schedule described later) for content for an information storage type broadcast service. ing. Alternatively, a delivery schedule table (repeated schedule table described later) for content for an information storage type broadcast service may be distributed by broadcast as metadata instead of SI or PSI. Alternatively, SI, PSI, and metadata may be distributed over a network.

Then, the program arrangement information generated by the EPG data generation unit 22 is subjected to TS conversion processing by the TS conversion processing unit 23 and then supplied to the TS multiplexing unit 17.
The TS multiplexer 17 multiplexes the TSs output from the TS processing units 21 and 23 and the encryption processing unit 16.
The TS multiplexed by the TS multiplexer 17 is subjected to encoding processing corresponding to the transmission path by the transmission path encoding section 24, and then supplied to the antenna 26 via the output terminal 25 and transmitted. .

  Further, the content for the storage-type broadcast service that has been encrypted by the encryption processing unit 19 is also supplied to the input terminal 29 of the network server 28 (broadcast complement server) via the output terminal 27.

The network server 28 supplies the content supplied to the input terminal 29 to an HDD (hard disk drive) 30 that is a recording device, and records the content on the hard disk 30a.

The HDD 30 is connected to a network 33 such as the Internet via a network interface 31 and an input / output terminal 32.
When the HDD 30 receives a content acquisition request from the receiver via the input / output terminal 32 and the network interface 31 from the network 33, the HDD 30 reads all or part of the requested content from the hard disk 30 a, and the network interface 31. The data is transmitted to the network 33 via the input / output terminal 32.

This makes it possible to implement a service (broadcast supplement method) that acquires supplemental data through a communication channel.
The EPG data generation unit 22 also provides information related to a broadcast service distribution schedule by a file casting method, in addition to an electronic program guide for real-time broadcast service content.

FIG. 2 is a block diagram showing a broadcast receiving apparatus using the file casting method according to the embodiment.
Reference numeral 34 denotes a broadcast receiving device (content receiving device). Here, an example of a broadcast receiving device (content receiving device) 34 on the receiving side in the multimedia broadcasting service is shown.

Reference numeral 35 is an antenna, reference numeral 36 is an input terminal, reference numeral 37 is a channel selection demodulator, reference numeral 38 is a TS separator, reference numeral 39 is a decoding processor, reference numeral 40 is a PES / section separator, reference numeral 41 is an MPEG decoder, Reference numeral 42 denotes a selective multiplexing unit.

Reference numeral 43 denotes a program guide creation unit.
Reference numeral 44 denotes a content decoding unit, reference numeral 45 denotes an HDD, reference numeral 45a denotes a hard disk, reference numeral 46 denotes a decoding processing unit, and reference numeral 47 denotes a decoder.
Reference numeral 48 denotes a video display unit, and reference numeral 49 denotes a speaker.
Reference numeral 50 denotes a control unit, reference numeral 50a denotes a CPU, reference numeral 50b denotes a memory unit, reference numeral 51 denotes an operation unit, reference numeral 52 denotes a communication control unit, reference numeral 53 denotes a network interface, and reference numeral 54 denotes an input / output terminal.

The digital broadcast signal received by the antenna 35 is supplied to the channel selection demodulation unit 37 via the input terminal 36.
This channel selection demodulator 37 selects a broadcast signal of a desired channel from the input broadcast signal, and demodulates the TS by performing demodulation processing on the selected broadcast signal.
The TS output from the channel selection / demodulation unit 37 is supplied to the TS separation unit 38, the TS corresponding to the content for real-time broadcasting service, the TS corresponding to the content for storage broadcasting service, and the EPG It is separated into TS corresponding to the program arrangement information generated by the data generation unit 22.

  Among these, the TS corresponding to the content for the real-time broadcasting service is subjected to encryption decryption processing by the decryption processing unit 39, and is converted into PES / section by video and audio by the PES / section separation unit 40. After being divided into contents, the MPEG decoder 41 performs decompression processing on each of the video and audio contents, and then supplies them to the selective multiplexing unit 42.

  Also, the TS corresponding to the program arrangement information separated by the TS separation unit 38 is supplied to the program guide creation unit 43 to create contents for OSD (on screen display) for displaying the electronic program guide. Provided.

Then, the OSD content corresponding to the electronic program guide created by the program guide creation unit 43 is supplied to the selection multiplexing unit 42.
Further, the TS corresponding to the content for the storage-type broadcast service separated by the TS separation unit 38 is encapsulated (ULE) decoding processing, IP packetization / header compression (ROHC) decoding processing by the content decoding unit 44, After the FLUTE decoding process or the like, the HDD 45 records (accumulates) the data on the hard disk 45a.

  Further, the content read from the hard disk 45a by the HDD 45 is subjected to encryption decryption processing by the decryption processing unit 46, decoded by the decoder 47 in accordance with each content such as video and audio, and then the selective multiplexing. To the conversion unit 42.

  The selective multiplexing unit 42 selectively multiplexes the video content supplied from the MPEG decoder 41, the program guide creation unit 43, and the decoder 47, for example, for multi-screen display, and displays the video. The video is output to the unit 48 and displayed.

The selective multiplexing unit 42 selectively outputs the audio content supplied from the MPEG decoder 41 and the decoder 47 to the speaker 49 for audio reproduction.

  Here, in the broadcast receiving apparatus (content receiving device) 34, all the operations including the above-described various receiving operations and recording / reproducing operations are controlled by the control unit 50.

The control unit 50 includes a central processing unit (CPU) 50a, receives operation information sent from the operation unit 51 by a user operation (not shown), and controls each unit so that the operation content is reflected. is doing.

In this case, the control unit 50 uses the memory unit 50b.
The memory unit 50b mainly includes a ROM (read only memory) storing a control program executed by the CPU 50a, a RAM (random access memory) for providing a work area to the CPU 50a, various setting information and control information. And so on.

Further, the control unit 50 can generate a request for obtaining desired complementary data to the HDD 30 of the network server 28 via the communication control unit 52.
That is, the communication control unit 52 generates a request for acquiring desired complementary data to the HDD 30 via the network interface 53, the input / output terminal 54, the network 33, the input / output terminal 32 of the network server 28, and the network interface 31. Yes.

  The communication control unit 52 acquires the content read by the HDD 30 from the hard disk 30a based on the content acquisition request via the network interface 31, the input / output terminal 32, the network 33, the input / output terminal 54, and the network interface 53. The data is recorded on the hard disk 45a by the HDD 45.

  Thus, the user can view not only a real-time broadcasting service for viewing various contents such as broadcast programs and data broadcasts in real time, but also a service for viewing various contents transmitted for storage and stored in the HDD 45 at an arbitrary timing. In addition to being able to enjoy a service for acquiring and viewing necessary content from the network server 28 at an arbitrary timing, the content data recorded on the hard disk 45a by the HDD 45 as content for the storage-type broadcasting service can be received. Can be acquired from the network server 28 as supplementary data, and various contents stored in the HDD 45 can be supplemented to receive the service.

  FIG. 3 is a diagram for explaining a broadcasting method using the file casting method according to the embodiment. The broadcast file (program group) is divided into a plurality of groups, and the time zone for file casting is also divided into a plurality of time zones. FIG. 10 is an explanatory diagram of a method of changing the number of retransmissions of a group assigned to a certain time zone and the number of retransmissions of a group assigned to another time zone.

  As shown in FIG. 3, here, the daytime distribution time zone is from 9:00 am to 21:00 pm. In multimedia broadcasting for portable terminals, it is assumed that a user carries a broadcast receiver (mobile terminal) and receives the broadcast while moving. Therefore, in the daytime distribution time zone, it is generally assumed that the multimedia broadcast receiver (portable terminal) is likely to move with the user as the user moves.

That is, it is often assumed that the user cannot move stably during the daytime and cannot stably receive the user because the user is in a vehicle, in a building, or in a place with a poor radio wave condition.
On the other hand, the night distribution time zone is from 21:00 to 9:00 the next morning. In the night delivery time zone, it is generally assumed that there is a high possibility that the movement of the user and the movement of the receiving device are small compared to the daytime.

In other words, at night, the user inserts the broadcast receiver into a jacket (attached device) that can supply power in the house (charging the equipment, etc.) and supplying broadcast radio waves with an antenna other than the antenna built in the receiver. Therefore, an information storage type broadcasting system (file casting system) is preferable because multimedia broadcasting can be stably received. Alternatively, it is possible to place the broadcast receiver (portable terminal) in a place where a multimedia broadcast can be stably received, such as by a window, without being inserted into a jacket (attached device).

In the multimedia broadcasting for portable terminals having such characteristics, as shown in FIG. 3, a predetermined broadcast transmission channel is used, and as described above, the day program data (multimedia) As content and services provided as broadcasts, various services such as video content, which is the mainstream of current TV services, content mainly based on texts and photographs such as newspapers, and data content such as games may be provided. Because it is considered, it is described as the program group) and will be distributed in 12 hours from 9:00 to 21:00. Here, the number of retransmissions is four.

Similarly, as night program data, the night distribution program group (a plurality of content groups as in the day distribution program group) is distributed from 12 o'clock to 9 o'clock the next morning. In this example, the number of retransmissions is two.

With this configuration, when the transmission capacity (bandwidth) of a certain broadcast transmission channel is constant, the number of retransmissions for the day distribution program group is four and the number of retransmissions for the night distribution program group is two. The total amount of content (programs) that can be transmitted in the distribution program group is twice that of content (programs) that can be transmitted in the day distribution program group, and more content can be provided.

On the other hand, as described above, in the day distribution program group, the number of retransmissions of the program group is increased from the night distribution program group in accordance with the user's behavior pattern, thereby preventing accumulation leakage and reducing information defect recording. It becomes possible.

At night, it is assumed that there is less movement of the broadcast receiver (portable terminal) than in the daytime, and it is inserted into a jacket (attached device) that can supply power from a household power source and the like and supply broadcast waves from an antenna. Because it is assumed that it is possible to receive broadcasts stably, etc., in the night distribution program group, more contents (programs) can be transmitted with less number of retransmissions than in the daytime without omission of accumulation or information defect, Recording on equipment is possible.

That is, the number N (here, 4) of program groups broadcasted during the daytime period is larger than the number M (here, 2) of program groups broadcasted during the nighttime period. It is also possible to reduce the total data amount of the program group that is broadcast during the daytime period, and to increase the number of retransmissions compared to the nighttime program group than the night time period. Thereby, although there is much movement in the daytime (stable reception is not possible), it is suitable for preventing accumulation leakage.

In this embodiment, the files to be cast are divided into a plurality of groups, the time zone for file casting is also divided into a plurality of time zones, the groups are associated with the time zones, and assigned to a certain time zone. The number of group retransmissions and the number of group retransmissions assigned to different time zones are changed.

Note that the disclosure of the number of retransmissions in this embodiment is an exemplification, and it is desirable to change appropriately according to the time zone. The time zone is divided into 9 o'clock and 21 o'clock, but it is desirable to set an appropriate time according to the user's behavior pattern. In addition, although an example of dividing the interband into two is shown, it is more detailed according to the user's behavior pattern, 3 or more (for example, if there are three, the moving user's behavior pattern moves well, sometimes moves, moves It is also possible to categorize it in a case where it can be classified into “No”.

By configuring in this way, it is possible to provide an information storage type broadcasting service that reduces transmission capacity (bandwidth) consumption while reducing defects in the information recorded on the recording medium in the information storage type broadcasting service. It is.

FIG. 4 is a diagram for explaining a broadcasting method using the file casting method according to the embodiment. The coding rate of the error correction code of the group assigned to a certain time zone and the assigned time rate to another time zone. It is explanatory drawing of the system which changes the code rate of the error correction code | cord | chord of another group.

In an information storage type broadcasting service, transmission / reception of program data can be applied to transmission / reception of error correction codes.
Here, a broadcast transmission channel is used to deliver the daytime program group between 9 am and 9 pm. As for the coding rate of the error correction code, for example, 1/2 of the transmission capacity (bandwidth) is used as the correction code.

Also, the night distribution program group will be distributed from 21:00 to 9:00 the next morning. In this example, the correction code has a coding rate of 0, that is, no correction code.
As shown in FIG. 4, when the transmission capacity (bandwidth) of a transmission channel of a certain broadcast is constant, the total amount of content (program) itself that can be transmitted in a night distribution program group with a high coding rate is the day distribution program. The content (program) that can be transmitted in the county is doubled, and more content can be provided.

By configuring in this way, it is assumed that the user moves a lot during the day as in the above case, but by applying a strong error correction code to the daytime distribution program group, accumulation leakage is prevented and information defects are reduced. Thus, it is possible to record to a recording device.

Further, in the night distribution program group, it becomes possible to record information with reduced accumulation errors and information defects with a lot of contents (programs) with an error correction code weaker than noon.
Also in this embodiment, the coding rate of the correction code is an example, and can be changed according to the time zone.
3 and 4, the reception error (reception sensitivity) at the receiver is detected in a specific time zone (night) where the number of retransmissions of the program is small or the correction code is weak, and the reception error is detected. It is possible to warn when there are many.

Whether or not it is this specific time zone (night) is provided together with the broadcast signal from the broadcast station. In addition, the warning is to be notified to the user by using functions such as sound, light, vibration, etc. that are installed in mobile devices such as mobile phones, mobile PCs, and PDAs. As a result, the user can recognize that there are many reception errors by warning, and in that case, the broadcast receiver (portable terminal) can be relocated to a place where multimedia broadcasts can be stably received, such as by the window. , It is possible to prevent the accumulation omission of the night distribution program group with a small number of retransmissions or weak correction codes

Alternatively, whether or not a specific time zone (night) is not provided together with the broadcast signal from the broadcast station, the number of retransmissions of the program group or the coding rate of the correction code is detected by the receiver, and the number of retransmissions is predetermined. It is also possible to be in a specific time zone (night) when the value is less than the numerical value of or when the coding rate of the correction code is higher than a predetermined value (weak correction code). This predetermined numerical value may be set by the user, or may be provided together with a broadcast signal from a broadcast station.

With this configuration, in information storage broadcasting services, the consumption of transmission capacity (bandwidth) is reduced while reducing the defect in recorded information by taking into account user behavior characteristics that change over time such as day and night. It is possible to provide an information storage type broadcasting service.

  FIG. 5 is a diagram for explaining a broadcasting method using the file casting method according to the embodiment, and the number of retransmissions of a group assigned to a certain time zone and the number of retransmissions of a group assigned to another time zone. FIG. 2 is an explanatory diagram of a method of changing the number of retransmissions of a program group transmitted through transmission channel 1 and transmission channel 2.

  In the description of FIGS. 3 and 4, an example in which one transmission channel is used in transmission of a program group has been described. However, the embodiment of FIG. 5 can be applied to a plurality of transmission channels.

For example, a program (content) with high immediacy such as news is required to provide a program to a viewer as soon as possible (that is, accumulate as soon as possible), but in the embodiment of FIG. 5, this is possible. is there.

  That is, here, the transmission channel 1 is configured in the same manner as in the example of FIG. 3, but the transmission channel 2 has a smaller amount of data for the day distribution program group 2 and the day distribution program group 3 (for example, in FIG. 5). The program group is set to be about 1/2, and the retransmission period is increased to make it frequent.

By doing so, the day delivery program group 2 and the day delivery program group 3 can accumulate (complete) the programs as soon as possible.
Then, the program can be provided to the user as soon as possible from the start of distribution.
That is, here, it is possible to provide highly immediate content by setting the program broadcast on the transmission channel 2 to a program group with a smaller amount of data (for example, about 1/2 in the figure) than the transmission channel 1. become.

That is, in this embodiment, a specific time zone is further subdivided and the retransmission cycle is changed (increased).
As a result, content with high immediacy is completed as soon as possible.
Although an example of retransmitting program data is used here, this embodiment can also be applied to a method of changing the coding rate of an error correction code as shown in FIG.
FIG. 6 is a diagram for explaining a broadcasting method using the file casting method according to the embodiment. In the specific time zone (daytime), the accumulation state is detected, and the power is supplied in the retransmission time zone of the group that has been accumulated. It is explanatory drawing of the system turned off.

  Similar to FIG. 3, this embodiment relates to a diagram for explaining a broadcasting method using the file casting method according to the embodiment, and divides a file (program group) to be broadcast into a plurality of groups and performs file casting. The band is also divided into a plurality of time periods, and the number of retransmissions of a group assigned to a certain time period and the number of retransmissions of a group assigned to another time period are changed.

Here again, the time from 9 am to 21 pm is the daytime distribution time zone. Also, the night delivery time zone is from 21:00 to 9:00 the next morning.
Then, using a predetermined broadcast transmission channel, the daytime distribution program group (a group in which a plurality of data packets are continuous) is distributed between 9:00 and 21:00. Here, the number of retransmissions is four.

Similarly, a night distribution program group (a group of a plurality of data packets) is distributed from 21:00 to 9:00 the next morning. In this example, the number of retransmissions is two.
Here, as shown in the figure, the receiver detects the accumulation state in a specific time zone (daytime). Then, for the group detected to be accumulated, for example, the power is turned off in the corresponding retransmission time zone so as to reduce the power used by the broadcast receiving device (content receiving device) 34. Note that the broadcast receiving device (content receiving device) 34 is assumed to be mounted on a mobile device such as a mobile phone, a mobile PC, or a PDA, and the reduction of the power used by the broadcast receiving device (content receiving device) 34 is at least broadcast. This is for the functional block part related to reception, and it does not cover the power supply related to the mobile phone function, mobile PC function, and PDA function part.

As a result, it is possible to suppress the power consumption of the battery or the like connected to the broadcast receiving device (content receiving device) 34 while preventing the program from being leaked.
It is also possible to configure such that storage is stopped or a warning is issued when the stored power of the battery is low.
That is, in this embodiment, the accumulation state is detected in a specific time zone (daytime), and the power is turned off in the retransmission time zone of the group that has already been accumulated.
Thereby, it is possible to suppress battery consumption while preventing accumulation leakage.
Further, when the remaining battery level is low, it is possible to stop accumulation or issue a warning.
<Example 2>
In the above embodiment, in order to provide an information storage type broadcasting service that consumes less transmission capacity (bandwidth), the number of retransmissions in a specific time zone is reduced or the coding rate of an error correction code is increased (correction). It was explained that the code was weak. Therefore, it is necessary to reduce the reception error in the night time zone as compared with other time zones, such as by inserting it in a jacket (attached device) capable of supplying broadcast radio waves.

An example to improve this is shown below.
This embodiment is applied to the broadcast receiving device (content receiving device) 34, for example.
Here, the broadcast receiving apparatus (content receiving apparatus) 34 further includes means for detecting a time zone in which the number of retransmissions or the encoding rate of the error correction code is suppressed.
Also, a means for detecting a reception error (reception sensitivity) is provided.
A means for warning is provided when there are many reception errors.
As a result, when there is a warning in a time zone in which the number of retransmissions is reduced or the encoding rate of the error correction code is increased (correction code is weak), the user can use the jacket that can supply the broadcast wave to the receiver. By inserting it into the (attached device), it is possible to prevent the program from being stored and to record without any information defect.

The warning is given to the user by sound or light.
Alternatively, instead of means for detecting a reception error (reception sensitivity), it is possible to have a means for detecting insertion into a jacket (attached device) capable of supplying broadcast radio waves, and to detect the presence or absence of insertion.

  In addition, the broadcast reception device (content receiving device) 34 may observe and detect an actual broadcast signal to determine whether the number of retransmissions or the time zone in which the encoding rate of the error correction code is suppressed. Alternatively, information indicating whether or not it is a time zone in which the coding rate of the error correction code is suppressed may be newly set as information, provided from the broadcasting station side, and detected by the broadcast receiving device (content receiving device) 34. .

Note that the information may be binary, and when the number of retransmissions or the error correction code coding rate is divided into three or more states, information of three or more values may be transmitted.
These pieces of information may be distributed to receivers as broadcast signal as part of program guide information using, for example, SI / PSI, or broadcast signal or part of program guide information using metadata. It may be delivered from a server to a receiver using a network.

<Example 3>
In the above embodiment, the number of retransmissions in a specific time zone is increased or the coding rate of the error correction code is decreased (correction code is made stronger).
Accordingly, when the program can be normally received during the time period, no further reception is required. For this reason, if data reception is continued even in a state where it is not necessary to receive a program, there is a possibility that power is wasted. An example for improving this problem is shown below.

Here, the broadcast receiving apparatus (content receiving apparatus) 34 includes means for detecting a time zone in which the number of retransmissions or the coding rate of the error correction code is lowered.
Also, a means for detecting the completion of reception of the program group scheduled for transmission is provided.
In addition, when the reception of the program group is completed (when it has already been accumulated), the retransmission time zone includes means for turning off the power.
This makes it possible to suppress battery consumption while preventing accumulation leakage.
When receiving contents of a plurality of transmission channels, for example, the above operation may be performed for each transmission channel.
Further, when the battery is low, the data storage may be stopped or a warning that the battery is low and the remaining amount is low may be issued.
By configuring as described above, in this embodiment, in the information storage type broadcasting service, the information storage type broadcasting service that reduces the recorded information defect while reducing the consumption of the transmission capacity (bandwidth). Service can be provided.

  Note that the above embodiment is not limited to the description itself, and in the implementation stage, the constituent elements can be variously modified and embodied without departing from the spirit of the invention.

  DESCRIPTION OF SYMBOLS 11 ... Broadcast transmission apparatus (content transmission apparatus), 12 ... Input terminal, 13 ... MPEG encoder, 15 ... TS conversion process part, 16 ... Encryption process part, 17 ... TS multiplexing part, 18 ... Input terminal, 19 ... Encryption Conversion processing unit, 20 ... content processing unit, 21 ... TS conversion processing unit, 22 ... EPG data generation unit, 23 ... TS conversion processing unit, 24 ... transmission path encoding unit, 25 ... output terminal, 26 ... antenna, 27 ... Output terminal 28 ... Network server (broadcast complement server) 29 ... Input terminal 30 ... Content recording device (HDD) 30a ... Hard disk 31 ... Network interface 32 ... Input / output terminal 33 ... Network 34 ... Broadcast reception Device (content receiving device), 35 ... antenna, 36 ... input terminal, 37 ... channel selection demodulator, 38 ... TS separator, 39 ... decoding processor, 4 ... PES / section separation unit, 41 ... MPEG decoder, 42 ... selective multiplexing unit, 43 ... program table creation unit, 44 ... content decoding unit, 45 ... HDD, 45a ... recorded (accumulated) on hard disk, 46 ... decoding Processing unit 47 ... Decoder 48 ... Video display unit 49 ... Speaker 50 ... Control unit 50a ... CPU 50b ... Memory unit 51 ... Operation unit 52 ... Communication control unit 53 ... Network interface 54 ... On Output terminal.

Claims (15)

  Broadcasting means for repeatedly broadcasting N pieces of data of the first broadcast program in the first time zone and broadcasting M pieces of data of the second broadcast program in the second time zone, The broadcast apparatus characterized in that the number of repetitions N of the first data broadcast in the time zone is greater than the number of repetitions M of the second data broadcast in the second time zone. The broadcasting apparatus according to claim 1, wherein the information amount of one data of the first broadcast program is smaller than the information amount of one data of the second broadcast program. The first broadcast program data is broadcast N times in the first data stream and the third broadcast program data is repeated L times in the second data stream in the first time zone, and in the second time zone. Broadcast means for repeatedly broadcasting the data of the second broadcast program in the first or second data stream by M times, wherein the repetition number N is smaller than the repetition number L and larger than the repetition number M. Broadcasting equipment. 4. The information amount of one data of the first broadcast program is larger than the information amount of one data of the third broadcast program, and is smaller than the information amount of data of the second broadcast program. The broadcasting apparatus described.   5. The broadcasting apparatus according to claim 1, wherein the first time zone includes daytime, and the second time zone includes nighttime. Receiving means for receiving data of a first broadcast program repeated N times transmitted in a first time zone and receiving data of a second broadcast program repeated M times sent in a second time zone; The broadcast receiving apparatus is characterized in that the number of repetitions N of the data of the first broadcast program is greater than the number of repetitions M of the data of the second broadcast program. 7. The broadcast receiving apparatus according to claim 6, wherein an information amount of one data of the first broadcast program is smaller than an information amount of one data of the second broadcast program. The N repeated first broadcast program data and the L repeated third broadcast program data transmitted in the first time zone are received and the M repeated first broadcast program data transmitted in the second time zone. A broadcast receiving apparatus comprising receiving means for receiving data of two broadcast programs, wherein the continuous repetition N is smaller than the repetition number L and larger than the repetition number M. 9. The information amount of one data of the first broadcast program is larger than the information amount of one data of the third broadcast program, and is smaller than the information amount of one data of the second broadcast program. The broadcast receiving apparatus described in 1.   10. The broadcast receiving apparatus according to claim 6, wherein the first time zone includes daytime and the second time zone includes night. Data accumulation detection means for detecting data accumulation completion of at least the data of the first broadcast program;
The apparatus further comprises power reduction means for reducing the power usage of the broadcast receiving device, and when the data storage completion of the data of the first broadcast program is detected, the power usage of the broadcast receiving device is reduced. The broadcast receiving apparatus according to claim 6. The broadcast receiving apparatus according to claim 6, wherein the data of the second broadcast program includes an error correction code. N times the first broadcast program is repeatedly transmitted in the first time zone, and M times the second broadcast program is repeatedly transmitted in the second time zone, and is transmitted in the first time zone. The broadcast reception method characterized in that the first data repetition number N is larger than the second data repetition number M transmitted in the second time period. Receiving first data of N repetitions of the first broadcast program transmitted in the first time zone, and receiving M repeated second data transmitted in the second time zone. The broadcast receiving method characterized in that the number of repetitions N of the first data is greater than the number of repetitions M of the second data. Detecting at least completion of data storage of data of the first broadcast program;
The method further comprises the step of reducing the power usage of the broadcast receiving device, and when the data storage completion of the data of the first broadcast program is detected, the power usage of the broadcast receiving device is reduced. Item 15. The broadcast receiving method according to Item 14.

Images