JP2008219189A - Broadcast stream recorder, broadcast stream recording method, broadcast stream recording program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manage one broadcast content recorded in a recording medium by one file even if normal data corresponding to a failure place in a broadcast stream received by a broadcasting station are acquired by an external device different from the broadcasting station. <P>SOLUTION: This broadcast stream recorder 102 is provided with: a write control part 205 for recording a broadcast stream received from the broadcasting station 101 in the recording medium 209; an error detecting part 202 for detecting a failure place of the received broadcast stream; and the normal data corresponding to the failure place wherein the write control part 205 collects normally received data other than the failure place among the received broadcast streams as one recorded broadcast stream including an area corresponding to the failure place and records the data, and additionally records normal data in the recorded broadcast stream when acquiring the normal data corresponding to the failure place from the external device other than the broadcasting station. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a broadcast stream recording apparatus, a broadcast stream recording method, a broadcast stream recording program, and a recording medium that record stream data such as a broadcast stream on a recording medium.

  In recent years, broadcasting services for mobile devices such as 1Seg have been started, and an environment in which mobile devices such as notebook personal computers, PDAs (Personal Digital Assistants), and mobile phones can view broadcast contents from broadcasting stations has been improved.

  Since these mobile devices are used outside, they cannot receive broadcast radio waves from broadcast stations in environments where radio waves do not enter, such as building shadows and underground. For this reason, there is a problem that a reception error occurs such that a video or audio to be reproduced is interrupted in a state where broadcast radio waves cannot be received.

  As means for solving such a problem, for example, a method of irradiating a radio wave again to a place where the radio wave is weak or the radio wave does not reach using a retransmission facility such as a gap filler is considered.

  As a countermeasure against other reception errors, Patent Document 1 prepares a reception recording device (hereinafter referred to as a server) capable of recording all broadcast streams constituting broadcast content, and receives broadcast radio waves such as the Internet. A terminal device that acquires a broadcast stream corresponding to a reception error portion from a server via a network different from the above is disclosed. Specifically, when an error is included in the broadcast stream received from the broadcast station, or there is a broadcast stream that could not be received, the terminal device sends a broadcast stream transmission request corresponding to the reception error part. , Send to the server via the Internet. The server that has received the transmission request from the terminal device transmits a broadcast stream corresponding to the transmission request to the terminal device. The terminal device that has received the broadcast stream corresponding to the error part from the server records the broadcast stream received from the server together with the control information for instructing the reproduction order and the like on the recording medium. Based on the control information instructing the playback order, the terminal device switches between the broadcast stream acquired by broadcast reception and the broadcast stream acquired from the server as appropriate for playback.

  Hereinafter, an example of storing and reproducing a broadcast stream in Patent Document 1 will be described with reference to FIG. FIG. 12 is an explanatory diagram illustrating a state in which a broadcast stream acquired by receiving broadcast radio waves and a broadcast stream acquired from a server are stored in a recording medium in a terminal device.

  First, a terminal device acquires a broadcast stream by receiving broadcast radio waves. Here, as shown in FIG. 12, when receiving a broadcast stream from a broadcast station, broadcast radio waves are transmitted between the broadcast stream 11 and the broadcast stream 12 and between the broadcast stream 12 and the broadcast stream 13. Reception failure occurs, and there are two reception errors in which the broadcast stream cannot be received. Therefore, the terminal device records the normal broadcast streams 11, 12, and 13 acquired by receiving the broadcast radio wave on its own recording medium.

  Next, the terminal device sends a normal broadcast stream 14 that should be between the broadcast stream 11 and the broadcast stream 12 and a normal broadcast stream 15 that should be between the broadcast stream 12 and the broadcast stream 13. It is obtained from a server that records all broadcast streams via the Internet. The terminal device records the broadcast streams 14 and 15 acquired from the server as update data in a recording medium as a file different from the broadcast streams 11 to 13 acquired from the broadcast station. The terminal device also records control information for determining the reproduction order of the broadcast streams 11 to 15 on the recording medium. Furthermore, when reproducing the broadcast stream recorded on the recording medium, the terminal device performs reproduction by switching the broadcast streams 11 to 15 based on the control information of the recording medium.

As described above, even if a reception error occurs in the broadcast stream received from the broadcasting station, the terminal device can acquire the broadcast stream corresponding to the reception error from the server that records the normal broadcast stream via the Internet. . As a result, the terminal device can record the broadcast content composed of a normal broadcast stream with no reception error on its own recording medium.
JP 2005-65232 A (published March 10, 2005)

  However, in the conventional example, the broadcast stream acquired by the broadcast station and the broadcast stream separately acquired from the server are recorded on the recording medium as individual different files. For this reason, when there are many reception failures such as when the terminal device is a portable mobile device, such as when moving between places with strong or weak broadcasting radio waves, the terminal device will respond to a single reception failure. Thus, the broadcast stream corresponding to the reception error part is acquired from the server, and the acquired broadcast stream is recorded as one file on its own recording medium. That is, if a plurality of reception failures occur during reception of one broadcast content, a large number of files are individually recorded on the recording medium of the terminal device, and a plurality of files are recorded for one broadcast content. Is recorded on the recording medium. Therefore, since a large number of files exist for one broadcast content in the terminal device, there is a problem that management of the broadcast content becomes complicated.

  The broadcast content indicates broadcast program information broadcast from a broadcast station, and the broadcast stream indicates a collection of data for configuring the broadcast content.

  The present invention has been made to solve the above-described problem, and its purpose is to obtain normal data corresponding to a defective portion in a broadcast stream received from a broadcast station from an external device different from the broadcast station. The present invention also provides a broadcast stream recording apparatus, a broadcast stream recording method, a broadcast stream recording program, and a recording medium capable of managing one broadcast content to be recorded on a recording medium by one file.

In order to solve the above problems, a broadcast stream recording apparatus according to the present invention provides:
A broadcast stream recording apparatus comprising recording means for recording a broadcast stream received from a broadcasting station on a recording medium,
Detecting means for detecting a defective portion of data in the received broadcast stream;
An acquisition means for acquiring normal data corresponding to the detected defect location from an external device;
The recording means is
Among the received broadcast streams, normally received data other than the defective part detected by the detection means are recorded together as one recorded broadcast stream including an area corresponding to the defective part,
When the normal data is acquired by the acquisition means, the normal data is additionally recorded in the recorded broadcast stream.

  According to the above configuration, the broadcast stream recording device can be configured to display a normal broadcast stream that does not have a defect when a data defect occurs in the broadcast stream received from the broadcast station due to, for example, a reception failure of the broadcast radio wave from the broadcast station. The areas corresponding to the defective portions are collectively recorded as one recorded broadcast stream on the recording medium. The defective part here is, for example, data error or missing data in the received broadcast stream. The broadcast stream recording apparatus records a normal broadcast stream and an area corresponding to a defective part on a recording medium as one file.

  Furthermore, the broadcast stream recording device includes an acquisition unit that acquires a normal broadcast stream corresponding to a defective portion due to reception failure from an external device different from the broadcast station. Further, the broadcast stream recording apparatus additionally records a normal broadcast stream corresponding to the defective part acquired by the acquisition unit on the recorded broadcast stream recorded on the recording medium.

  Therefore, the normal broadcast stream corresponding to the defective part acquired by the acquisition means is recorded in the file of the recorded broadcast stream. As a result, the broadcast stream recording device can receive the broadcast stream received from the broadcast station and the external device. The acquired broadcast stream can be recorded on the recording medium as one file.

  As described above, the broadcast stream recording apparatus of the present invention is recorded on the recording medium even when normal data corresponding to the defective part in the broadcast stream received from the broadcast station is acquired from an external device different from the broadcast station. There is an effect that one broadcast content can be managed by one file.

(Broadcast stream recording method)
In order to solve the above problem, a broadcast stream recording method according to the present invention provides:
A broadcast stream recording method comprising a recording step of recording a broadcast stream received from a broadcasting station on a recording medium,
A detection step of detecting a defective portion of data in the received broadcast stream;
An acquisition step of acquiring normal data corresponding to the detected defect location from an external device;
In the above recording step,
Among the received broadcast streams, normally received data other than the defective part detected by the detection step is recorded together as one recorded broadcast stream including an area corresponding to the defective part,
When the normal data is acquired in the acquisition step, the normal data is additionally recorded in the recorded broadcast stream.

  According to said structure, there exists an effect similar to the content reproduction apparatus based on this invention.

In the broadcast stream recording apparatus according to the present invention,
The recording means is
In addition to recording any dummy data in the area corresponding to the above defect location,
When the normal data is acquired by the acquisition unit, it is preferable that the normal data is overwritten on the dummy data.

  According to the above configuration, since the dummy data is recorded in the area corresponding to the defective part, normally received data other than the defective part and the dummy data are collectively recorded as one recorded broadcast stream. . Furthermore, the broadcast stream received from the broadcast station as one recorded broadcast stream, in other words, as a complete single file, by overwriting the dummy broadcast data with the normal broadcast stream acquired from the external device, and the external device The obtained broadcast stream can be recorded on a recording medium as one file.

In the broadcast stream recording apparatus according to the present invention,
The recording means is
When the defective portion is detected by the detecting means, arbitrary dummy data is recorded up to one access unit in the recording medium in the area corresponding to the defective portion,
After the dummy data is recorded up to the access unit, the recording of the dummy data on the recording medium is stopped while the defective portion is still detected by the detecting means.

  According to the above configuration, when the detection unit detects a defective part during recording of the broadcast stream received from the broadcast station, the recording unit can store up to one access unit of the recording medium that is recording the broadcast stream. Record any dummy data. In other words, the detection of the defective part prevents the free area from being generated in the access unit being recorded.

  Furthermore, the received broadcast stream after the occurrence of the defective portion is recorded from the beginning of a new access unit. Therefore, the free space in the access unit prevents the broadcast stream before the occurrence of the defective portion and the broadcast stream after the occurrence of the defective portion from being divided into individual files.

  Further, according to the above configuration, the recording unit records the dummy data up to the access unit, and then stops recording the dummy data on the recording medium while the detection unit continues to detect the defective portion. As a result, even if the defect location becomes long, dummy data is not recorded for all areas corresponding to the failure location. As a result, the broadcast stream recording apparatus has an effect that the recording medium can be used efficiently.

In the broadcast stream recording apparatus according to the present invention,
Dividing means for dividing the received broadcast stream into partial streams having a predetermined data length;
Generating means for generating, for each partial stream, an identifier for individually identifying the partial stream,
The detection means detects a defective portion of the data for each partial stream,
The recording means records the normally received partial streams together as the recorded broadcast stream, and at least the identifiers of normal partial streams located before and after the defective portion among the generated identifiers. It is preferable to record on the recording medium.

  According to said structure, when specifying the partial stream corresponding to a malfunction location, it can identify only with the identifier of the normal broadcast stream located before and behind a malfunction location.

  Therefore, when acquiring the partial stream corresponding to the defective portion from the external device, only the identifier of the normal broadcast stream located before and after the defective portion is transmitted to the external device, so that the normal partial stream corresponding to the defective portion is transmitted. The effect that can be acquired.

In the broadcast stream recording apparatus according to the present invention,
Preferably, the generating means generates the identifier for each partial stream by combining the predetermined function for generating the identifier and the content information of the broadcast stream.

  According to the above configuration, since the identifier is generated by combining the predetermined function and the content information of the broadcast stream, it is possible to prevent different identifiers from having the same identifier.

In the broadcast stream recording apparatus according to the present invention,
The predetermined function is preferably a hash function.

  According to said structure, it can prevent becoming the same identifier in a different partial stream.

In the broadcast stream recording apparatus according to the present invention,
The recording means preferably records only the identifiers of normal partial streams located before and after the defective portion among the generated identifiers on the recording medium.

  According to the above configuration, since it is not necessary to record on the recording medium other than the identifiers of normal partial streams located before and after the defective part, the process of recording data on the recording medium can be reduced.

In the broadcast stream recording apparatus according to the present invention,
It is preferable that the image processing apparatus further includes transmission means for reading the partial stream requested to be transmitted from the outside from the recording medium and transmitting the partial stream to the outside.

  With the above configuration, the broadcast stream requested by the other broadcast stream recording apparatus can be transmitted to the other broadcast stream recording apparatus. As a result, it can serve as a server for other broadcast stream recording devices.

In the broadcast stream recording apparatus according to the present invention,
Setting means for setting a priority for each partial stream in the recorded broadcast stream;
The transmission means preferably transmits the partial stream set with a higher priority to the outside with higher priority.

  According to said structure, a partial stream with a high priority can be preferentially transmitted to the exterior.

In the broadcast stream recording apparatus according to the present invention,
The setting means sets the priority set for the partial stream to be subjected to the intra-screen encoding higher than the priority set for the other partial streams, based on the encoding information of the video signal in the broadcast stream. It is preferable.

  According to the above configuration, since it is possible to preferentially transmit a partial stream to be subjected to intra-frame encoding, when a connection with the outside is disconnected during connection, a broadcast stream transmission request is issued. More images can be decoded in the broadcast stream recording apparatus that has been performed.

(Program and recording medium)
The broadcast stream recording apparatus may be realized by a computer. In this case, a broadcast stream recording program for realizing the broadcast stream recording apparatus in the computer by operating the computer as each of the above means, and a computer-readable recording medium recording the broadcast stream recording program are also included in the scope of the present invention. enter.

  In the broadcast stream recording apparatus of the present invention, as described above, the recording unit receives the data received normally other than the defective part detected by the detecting unit in the received broadcast stream in the area corresponding to the defective part. In addition, the normal data is additionally recorded in the recorded broadcast stream when normal data is acquired by the acquisition unit.

  Therefore, the broadcast stream recording apparatus of the present invention can manage one broadcast content recorded on the recording medium by one file.

  Embodiments according to the present invention will be described below with reference to the drawings.

(System configuration)
First, the configuration of the entire system in which the broadcast stream recording apparatus operates in this embodiment will be described below with reference to FIG. FIG. 2 is an explanatory diagram showing the overall system configuration in which the broadcast stream recording apparatus operates in the embodiment of the present invention.

  As shown in the figure, a system in which the broadcast stream recording apparatus 102 of the present invention operates includes a broadcast station 101 that transmits a broadcast stream by broadcast radio waves, and a broadcast that receives a broadcast stream from the broadcast station 101 and records it on a recording medium. The stream recording device 102 and the broadcast stream transmitting device 103 (external device), and the network 104 such as the Internet connecting the broadcast stream recording device 102 and the broadcast stream transmitting device 103 are configured.

  The broadcast stream transmitting apparatus 103 is installed in a place such as a home where there is no change in the broadcast radio wave status from the broadcast station. The broadcast stream recording apparatus 102 is in a portable environment such as a mobile phone.

(Operation of the entire system)
The broadcast stream recording device 102 and the broadcast stream transmission device 103 receive the broadcast stream transmitted from the broadcast station 101 by broadcast radio waves. The broadcast stream recording apparatus 102 and the broadcast stream transmission apparatus 103 record the received broadcast stream on respective recording media built therein. Here, since the broadcast stream recording apparatus 102 is an apparatus in a portable mobile environment, the broadcast stream recording apparatus 102 may move to the shadow of a building or underground, where the radio wave intensity from the broadcast station 101 is weak. By moving to such a place where the radio wave intensity of the broadcast radio wave is weak, the broadcast stream recording apparatus 102 has an error such as data error or data loss due to poor reception in the broadcast stream recorded on its recording medium. It includes a reception error (failure location).

  Here, when the broadcast stream recording apparatus 102 detects that there is a reception error in the broadcast stream recorded in its own recording medium, the broadcast stream recording apparatus 102 sends a broadcast stream transmission request corresponding to the reception error portion via the network 104 to the broadcast stream. The data is transmitted to the stream transmission device 103. The broadcast stream transmitting apparatus 103 that has received the transmission request from the broadcast stream recording apparatus 102 transmits a normal broadcast stream based on the transmission request to the broadcast stream recording apparatus 102. The broadcast stream recording apparatus 102 records the normal broadcast stream corresponding to the reception error part received from the broadcast stream transmission apparatus 103 on its own recording medium. As a result, the broadcast stream recording apparatus 102 can record the broadcast content composed of the broadcast stream that does not include a reception error in a recording medium built therein.

(Configuration of Broadcast Stream Recording Device 102)
Next, the configuration of the broadcast stream recording apparatus 102 will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the broadcast stream recording apparatus 102 in the embodiment of the present invention.

  As shown in the figure, the broadcast stream recording apparatus 102 includes a tuner 201 that receives a broadcast stream from the broadcast station 101 via an antenna 211, and a data error due to poor reception or a state in which the broadcast stream received cannot be received. An error detection unit 202 (detection unit) that detects presence / absence of reception insensitivity, a stream division unit 210 (division unit) that divides a broadcast stream from the broadcast station 101 into a predetermined data size length, and a predetermined data size An ID generation unit 204 (generation unit) that generates an ID corresponding to each broadcast stream divided in length, a write control unit 205 (recording unit) that controls recording of the divided broadcast stream, and the received broadcast stream And a recording medium 209 for recording IDs, and reading for reading data recorded on the recording medium 209 Control unit 208, a retransmission control unit 207 that outputs broadcast stream information corresponding to the reception error part to other devices as a transmission request, and a net interface unit 206 (acquisition means) that is an interface with the Internet. The

(Operation of Broadcast Stream Recording Device 102)
Next, the operation of the broadcast stream recording apparatus 102 will be described. A broadcast stream from the broadcast station 101 received via the antenna 211 and the tuner 201 is input to the error detection unit 202. The error detection unit 202 that has received the broadcast stream from the broadcast station 101 performs processing such as data demodulation and error correction to generate broadcast data. The broadcast data generated by the error detection unit 202 is a collection of fixed-length data called packets. Examples of broadcast data include TS (Transport Stream) standardized by MPEG (Moving Picture Expert Group). When the broadcast data is TS, the packet size is 188 bytes long.

  Here, when the broadcast stream recording apparatus 102 enters the shadow of a building, underground, or the like and the radio wave intensity of the broadcast radio wave becomes weak, a data error is mixed in the broadcast data generated by the error detection unit 202. Furthermore, when a reception insensitivity state where all or part of the broadcast radio waves from the broadcast station 101 cannot be received, a phenomenon such as loss of broadcast data recorded by the broadcast stream recording apparatus 102 occurs. Here, when the error detection unit 202 detects that a reception error such as data error or data loss has occurred in the received broadcast data, the error detection unit 202 generates information indicating the start of the reception error. Thereafter, when the broadcast radio wave can be normally received again, information indicating the end of the reception error is generated. The information indicating the start of the reception error generated by the error detection unit 202 and the information indicating the end of the reception error are combined into the reception insensitive information, and the error detection unit 202 stores the reception insensitive information in the write control unit 205. Output.

  Next, the broadcast data generated in the error detection unit 202 is output to the stream division unit 210 and the write control unit 205. The stream division unit 210 divides the broadcast data input from the error detection unit 202 into a predetermined unit, for example, the packet unit. Further, the stream dividing unit 210 outputs the divided broadcast data to the ID generation unit 204.

(Configuration and operation of ID generation unit 204)
Also, the ID generation unit 204 generates an ID value corresponding to each broadcast data divided by the stream division unit 210. Hereinafter, the configuration and operation of the ID generation unit 204 will be described with reference to FIG. FIG. 5 is a block diagram illustrating a configuration of the ID generation unit 204.

  As shown in the figure, the ID generation unit 204 includes an eigenvalue generation unit 501 and a content identification information generation unit 502. The divided broadcast data input from the stream dividing unit 210 is input to the eigenvalue generating unit 501. The eigenvalue generation unit 501 performs arithmetic processing on the input divided broadcast data, and generates a unique number corresponding to each divided broadcast data. In addition, the content identification information generation unit 502 generates identification information from content information of broadcast content configured by broadcast data, for example, a title of the broadcast content. Next, the unique number generated by the eigenvalue generation unit 501 and the identification information generated by the content identification information generation unit 502 are combined, and the ID generation unit 204 corresponds to each divided broadcast data. The ID is output to the write control unit 205. In addition, as the calculation processing in the unique information generation unit 501, a method using index values such as 0, 1, 2,... From the beginning of content, a method using time information when broadcast content is received, There is a method using a hash function that does not take the same value with the same content. If a hash function is used instead of a simple index or time information, the broadcast data divided can be uniquely specified by the ID value. For example, between the broadcast stream recording device and the broadcast stream transmission device, Therefore, it is not necessary to strictly match the recording start timing and the time of each device itself.

(Dummy data recording)
Next, the operation in the write control unit 205 will be described with reference to FIGS. FIG. 6A is an explanatory diagram showing data input to the write control unit 205, and FIG. 6B is an explanatory diagram showing data written to the recording medium 209 by the write control unit 205. (C) is explanatory drawing which shows the divided | segmented normal broadcast data acquired from the broadcast stream transmission apparatus 103. FIG.

  As shown in FIG. 6A, the reception insensitivity information, the broadcast data, and the ID input by the writing control unit 205 are as follows for each normal broadcast data with no reception error and each divided normal broadcast data. This is reception insensitivity information indicating a corresponding ID and a location where a reception error has occurred.

  Here, the writing control unit 205 sequentially inputs the input broadcast data and the corresponding ID to the recording medium 209. Here, when information indicating the start of a reception error is input from the error detection unit 202, recording of broadcast data and ID is stopped, and recording of dummy data is started instead. Next, when the write control unit 205 inputs information indicating the end of the reception error from the error detection unit 202, the recording of the dummy data is terminated. Further, after inputting information indicating the end of the reception error, the writing control unit 205 starts writing the input normal broadcast data and the ID corresponding to the recording medium 209. Even if broadcast data is input to the write control unit 205 between the time when the information indicating the start of the reception error and the time when the information indicating the end of the reception error is input, the write control unit 205 The input broadcast data is not written to the recording medium 209. As a result, the recording medium 209 is in a state where dummy data is recorded in the area corresponding to the reception error, as shown in FIG. Here, the shaded portion in FIG. 5B is an area where dummy data is recorded. In FIG. 5B, the broadcast data and the ID corresponding to the broadcast data are recorded on the recording medium 209 as separate files, but the same is obtained by alternately interleaving the broadcast data and the corresponding ID. You may save as a file. Further, in the present embodiment, the reception insensitivity information from the error detection unit 202 is recorded at the head of the area where the broadcast data is recorded, but may be recorded on the recording medium 209 as a separate file.

(Recording dummy data in cluster units)
As described above, the writing control unit 205 continues to record the dummy data on the recording medium 209 after inputting the information indicating the start of the reception error until inputting the information indicating the end of the reception error. ing. However, the present embodiment is not limited to this, and dummy data may be recorded in cluster units that are recording units of the recording medium 209 as described below.

  In the following, another embodiment relating to recording of dummy data will be described with reference to FIGS. FIG. 13A is an explanatory diagram showing broadcast data received from the broadcast station 101, and FIG. 13B shows broadcast data received from the broadcast station 101 and clusters that are access units in the recording medium 209. It is explanatory drawing which shows a relationship, The same figure (c) is the broadcast data corresponding to the reception error location acquired from the broadcast stream transmission apparatus 103.

  As shown in FIG. 5A, in the broadcast stream recording apparatus 102, after receiving broadcast data A to C from the broadcast station 101, a reception error due to reception failure occurs. Thereafter, there is no occurrence of reception failure, and normal broadcast data F to I with no reception error are received. Note that broadcast data corresponding to a reception error occurring between reception of broadcast data C and reception of broadcast data F are broadcast data D and E. In FIG. 5B, it is assumed that clusters, which are access units of the recording medium 209, are arranged in order of reproduction from left to right.

  As shown in FIGS. 2A and 2B, the write control unit 205 records broadcast data A and B in the first cluster, and broadcast data C in the second cluster. Here, it is assumed that broadcast data is divided so that two broadcast streams correspond to one cluster. Since the size of the received broadcast data C and the cluster size do not always coincide with each other, the write control unit 205 receives the broadcast data C when information indicating the start of reception error is input after the broadcast data C is input. Dummy data is recorded in an empty area in the second cluster in which is recorded. Next, the write control unit 205 ends the recording of dummy data when there is no free area in the second cluster. Further, after finishing the recording of the dummy data in the empty area of the second cluster, the write control unit 205 is in a standby state until information indicating the end of the reception error is input. After the information indicating the end of the reception error is input, the write control unit 205 sequentially records the input broadcast data F to I in each cluster. Further, when the broadcast data D and E corresponding to the reception error location are acquired from the broadcast stream transmitting apparatus 103, the write control unit 205 has already recorded the broadcast data D and E on the recording medium 209. After I, recording is performed on the recording medium 209.

  As described above, when a vacant area occurs in a cluster in which broadcast data is recorded due to a reception error, the write control unit 205 records dummy data in the vacant area, and vacant area in the cluster in which the broadcast data is recorded. There is no state. As described above, in the cluster in which the broadcast data constituting one broadcast content is recorded, the cluster in which the broadcast data constituting one broadcast content is recorded as one file by eliminating the free area of the cluster due to a reception error. The recording medium 209 is recognized.

(Read boundary ID)
Next, the read control unit 208 reads out reception insensitivity information from the recording medium 209 based on the control from the retransmission control unit 207. Further, the read control unit 208 outputs the read reception insensitivity information to the retransmission control unit 207. Here, if reception insensitivity information is not recorded on the recording medium 209, the retransmission control unit 207 determines that the broadcast data recorded on the recording medium 209 is broadcast data with no reception error. On the other hand, if reception insensitivity information is recorded on the recording medium 209, the retransmission control unit 207 determines that there is a reception error in the broadcast data recorded on the recording medium 209, and the broadcast data corresponding to the location of the reception error Is acquired from the broadcast stream transmitting apparatus 103.

  When the reception insensitivity information is input from the read control unit 208, the retransmission control unit 207, as shown in FIG. 6B, normal broadcast data adjacent to the boundary between the location where there is a reception error and the normal broadcast data. The read control unit 208 is controlled so as to read two IDs corresponding to (hereinafter referred to as boundary IDs). The read control unit 208 reads two boundary IDs from the recording medium 209 based on an instruction from the retransmission control unit 207 and outputs the two boundary IDs to the retransmission control unit 207.

  The retransmission control unit 207 that has input the two boundary IDs transmits the two boundary IDs to the broadcast stream transmitting apparatus 103 via the network interface unit 206 in order to acquire normal broadcast data corresponding to the location of the reception error. To do.

(Acquisition of normal broadcast stream)
Next, a process in which the broadcast stream recording apparatus 102 acquires a normal broadcast stream corresponding to a reception error location from the broadcast stream transmission apparatus 103 will be described with reference to FIG. FIG. 7 is a sequence diagram showing a normal broadcast stream request and response flow in the broadcast stream recording apparatus 102 and the broadcast stream transmission apparatus 103.

  As shown in the figure, when the broadcast stream recording apparatus 102 detects that the broadcast data recorded in the recording medium 209 included in the broadcast stream recording apparatus 102 has a reception error, the broadcast stream recording apparatus 102 A connection with the broadcast stream transmitting apparatus 103 is established. Next, the broadcast stream recording apparatus 102 makes an ID inquiry to the broadcast stream transmission apparatus 103 to inquire whether a normal broadcast stream corresponding to the location of the reception error is recorded. Specifically, the broadcast stream recording apparatus 102 transmits the two boundary IDs read from the recording medium 209 to the broadcast stream transmission apparatus 103 (step 701: hereinafter abbreviated as S701). The broadcast stream transmitting apparatus 103 that has received two boundary IDs from the broadcast stream 102 searches whether broadcast data existing between the two boundary IDs is recorded in its own recording medium (S702). As a result of the search, when normal broadcast data existing between two received boundary IDs has been recorded, the broadcast stream transmitting apparatus 103 broadcasts normal broadcast data existing between the two boundary IDs. The data is transmitted to the stream recording device 102 (S703). Note that the detailed processing for searching for broadcast data existing between two boundary IDs in S702 will be described later.

(Write update data)
Here, normal broadcast data existing between two boundary IDs, in other words, broadcast data received from the broadcast stream transmitting apparatus 103, which is normal broadcast data corresponding to a reception error location (hereinafter referred to as update data). The stream recording apparatus 102 inputs the update data to the write control unit 205 via the network interface unit 206. Furthermore, the writing control unit 205 that has input the update data overwrites the input update data on the dummy data recorded on the recording medium 209 as shown in FIG. The write control unit 205 overwrites the update data with the dummy data recorded on the recording medium 209 so that the broadcast data recorded on the recording medium 209 has the same state as the state where the broadcast data without reception error is recorded. Become.

  In the present embodiment, the broadcast stream recording apparatus 102 records all IDs corresponding to broadcast data to be recorded on the recording medium 209 on the recording medium 209, but the present invention is not limited to this. Of the IDs to be recorded, only two boundary IDs for indicating the location of the reception error may be recorded on the recording medium 209. Furthermore, after the update data is overwritten on the dummy data, in other words, after all the normal broadcast data is recorded on the recording medium 209 of the broadcast stream recording apparatus 102, an ID corresponding to the broadcast data is not necessary. The ID may be deleted. With such a configuration, files corresponding to IDs can be reduced, and content management becomes easy.

(Configuration of Broadcast Stream Transmitting Device 103)
The configuration of the broadcast stream 103 will be described below with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of the broadcast stream transmitting apparatus 103.

  As shown in the figure, the broadcast stream 103 is in a state where the tuner 201 that receives the broadcast stream from the broadcast station 101 via the antenna 211 and the received broadcast stream cannot receive data errors due to poor reception or cannot be received. Corresponding to the error detection unit 202 that detects the presence or absence of reception insensitivity, the stream division unit 210 that divides the broadcast stream from the broadcast station 101 into a predetermined data size length, and the broadcast stream that is divided into the predetermined data size length An ID generation unit 204 that generates an ID to be recorded, a write control unit 205 that controls recording of the divided broadcast stream, a recording medium 209 that records the divided broadcast stream, and data recorded on the recording medium 209 A read control unit 208 to read and a network as an interface with the Internet. In response to a broadcast data transmission request from the interface unit 206 and an external device, a transmission data detection unit 212 (transmission unit, setting unit) that detects whether broadcast data corresponding to the transmission request is recorded in its own recording medium 209 ).

(Operation of Broadcast Stream Transmitting Device 103)
Next, the operation in the broadcast stream transmitting apparatus 103 will be described with reference to FIG. Note that in the description of the operation of the broadcast stream transmitting apparatus 103, a different part from the broadcast stream recording apparatus 102 will be described, and the antenna 211, the error detecting unit 211, the stream dividing unit 210, the ID generating unit 204, which are overlapping blocks, Description of operations in the write control unit 205 and the recording medium 209 is omitted.

  The broadcast stream transmitting apparatus 103 records the broadcast stream received from the broadcast station 101 on the recording medium 209 as broadcast data. In the broadcast stream transmitting apparatus 103, all IDs corresponding to broadcast data recorded on the recording medium 209 are also recorded on the recording medium 209.

  FIG. 8 is a sequence diagram showing processing from the reception of the boundary ID to the transmission of the update data indicated by the two boundary IDs in the broadcast stream transmitting apparatus 103.

  As shown in the figure, after establishing a connection with the broadcast stream recording apparatus 102, the broadcast stream transmitting apparatus 103 receives two boundary IDs that are ID inquiries from the broadcast stream recording apparatus 102 to the network interface unit 206. (S801). The two boundary IDs received by the network interface unit 206 are input to the transmission data detection unit 212 as a determination processing start request (S802). The transmission data detection unit 212 having input the two boundary IDs controls the read control unit 208 to read all IDs recorded on the recording medium 209 (hereinafter referred to as storage IDs) (S803). The read control unit 208 reads the storage ID based on the control of the transmission data detection unit 212. Further, the read control unit 208 outputs the read storage ID to the transmission data detection unit 212 (S804). Next, the transmission data detection unit 212 sequentially compares the storage ID and the two boundary IDs (S805). In the comparison in S805, after two IDs that match the two boundary IDs are detected from the stored ID, the ID between the two matching IDs, in other words, the ID corresponding to the update data (hereinafter referred to as a transmission ID). ) Is transmitted to the read control unit 208 (S806). The read control unit 208 reads broadcast data corresponding to the transmission ID recorded in the recording medium 209 based on the input transmission ID, and sequentially outputs the read broadcast data to the network interface unit 206 as update data (S807). ). The network interface unit 206 sequentially transmits the update data input from the read control unit 208 to the broadcast stream recording apparatus 102 that has transmitted the boundary ID (S808).

(Successive comparison)
Here, the successive comparison of S805 in the transmission data detection unit 212 will be described with reference to FIG. FIG. 9 is an explanatory diagram showing a process of generating a transmission ID by successive comparison between the stored ID and the two boundary IDs in the transmission data detection unit 212.

  The transmission data detection unit 212 that has input the storage ID and the two boundary IDs performs sequential comparison with the storage ID for each of the two boundary IDs composed of a pair of IDs, as shown in FIG. Here, after an ID that matches each of the two boundary IDs is detected in the stored ID, the transmission data detection unit 212 uses the ID between the two matching IDs as the transmission ID corresponding to the update data. And output to the read control unit 208.

(Broadcast stream priority)
Next, the priority of the broadcast data corresponding to the boundary ID in the broadcast stream transmitting apparatus 103 will be described with reference to FIG. 10 and FIG. FIG. 10 is an explanatory diagram showing broadcast stream priorities recorded in the broadcast stream transmitting apparatus 103.

(Transmission processing based on priority)
Here, since the broadcast stream recording apparatus 102 is a mobile device in a portable mobile environment, the communication line may be disconnected during the connection with the broadcast stream transmission apparatus 103. For example, it is assumed that the connection is disconnected while the broadcast stream recording apparatus 102 is receiving update data from the broadcast stream transmission apparatus 103. In such a case, in the broadcast data recorded in the broadcast stream transmitting apparatus 102, all requested update data cannot be received, and a part of the reception error remains in the broadcast data recorded in the recording medium 209. It will remain as it is.

  Here, when the update data corresponding to each transmission ID is output from the broadcast stream transmission apparatus 103 to the broadcast stream recording apparatus 102, the transmission data detection unit 212 determines the priority for each update data corresponding to each transmission ID. May be set, and update data may be output based on the priority.

  Hereinafter, transmission of update data based on the priority of broadcast data will be described with reference to FIG. FIG. 10 is an explanatory diagram showing the received boundary ID and the priority of broadcast data recorded on the recording medium 209 in the broadcast stream transmitting apparatus 103.

  As shown in the figure, the broadcast stream transmitting apparatus 103 inputs four boundary IDs indicating two reception error locations from the broadcast stream 102. In the figure, update data (A) and update data (B) corresponding to the reception error location indicated by the four boundary IDs are displayed by shading.

  Here, in the broadcast data recorded on the recording medium 209 of the broadcast stream transmitting apparatus 103, it is assumed that the broadcast data recorded in the area surrounded by the black frame shown in FIG. At this time, the broadcast stream recording apparatus 102 transmits the update data (A) after transmitting the update data (B), rather than transmitting the update data (B) after transmitting the update data (A). Even when the connection between the broadcast stream transmission apparatus 103 and the broadcast stream transmission apparatus 103 is disconnected during connection, it is possible to preferentially transmit a broadcast stream having a high priority to the broadcast stream recording apparatus 102.

(Priority setting and transmission processing)
In the following, the priority setting and sending process of update data, and the effects of sending update data based on the priority will be described with reference to FIGS. 11A to 11C using an example. .

  In FIGS. 3A to 3C, the broadcast data to be recorded is video information, and the broadcast data is further divided into frame units of the video information. Further, in FIGS. 4A to 4C, the frames are arranged in the order of reproduction from left to right.

  FIG. 11A is an explanatory diagram showing an example of broadcast data recorded by the broadcast stream recording apparatus 102 before update data recording, and FIG. 11B shows after update data recording not based on priority. It is explanatory drawing which shows an example of the broadcast data which the broadcast stream recording apparatus 102 has recorded, (c) is the broadcast stream recording apparatus 102 after the update data recording based on a priority is recorded. It is explanatory drawing which shows an example of broadcast data.

  As shown in FIG. 5A, in the broadcast data stored in the recording medium 209 in the broadcast stream storage device 102, the third frame to the ninth frame are reception error locations. In FIG. 9A, an I frame indicates a video frame encoded by intra-screen encoding, and P indicates a video frame encoded by inter-screen encoding. Further, in FIG. 6A, a frame marked with a cross indicates that it is a reception error location.

  Next, the broadcast stream transmitting apparatus 103 sequentially transmits the update data corresponding to the location of the reception error shown in FIG. 5A to the broadcast stream recording apparatus 102 in units of frames. Here, it is assumed that the communication line between the broadcast stream recording apparatus 102 and the broadcast stream transmission apparatus 103 is disconnected during transmission of update data, and the broadcast stream recording apparatus 102 receives only update data for four frames.

  Here, when the broadcast stream transmitting apparatus 103 transmits the update data to the broadcast stream recording apparatus 102 without considering the priority for each update data in units of frames, the broadcast data recorded by the broadcast stream recording apparatus 102 is the same. As shown in FIG.

  As shown in FIG. 4B, the broadcast stream recording apparatus 102 receives up to 4 frames from the beginning of the update data sequentially from the broadcast stream transmission apparatus 103, and records normal update data up to the received 4 frames. is doing. Here, looking at the number of unreproducible video frames in FIG. 7B, first, the seventh to ninth frames that could not be received from the broadcast stream transmitting apparatus 103 cannot be reproduced. Further, the 10th and 11th P frames, which were normally recorded in FIG. This is because the ninth I frame is a reception error, and the tenth and eleventh P frames encoded by the inter-frame coding are not decoded. Accordingly, in FIG. 5B, the number of frames that cannot be reproduced is five frames.

  Next, a case will be described in which the broadcast stream transmitting apparatus 103 sets a priority for each piece of update data in units of frames and transmits update data based on the priority.

  The transmission data detection unit 212 in the broadcast stream transmission apparatus 103 detects the encoded information for each frame constituting the update data, with respect to the update data input from the read control unit 208. Furthermore, the transmission data detection unit 212 sets a priority for each frame of the update data based on the detected encoding information for each frame. Specifically, a high priority is set for a video frame encoded by intra-screen encoding, and a low priority is set for a video frame encoded by inter-screen encoding. .

  Next, the transmission data detection unit 212 transmits update data to the broadcast stream recording apparatus 102 preferentially from the video frame encoded by the inter-frame encoding with a high priority based on the set priority.

  When the configuration in which the broadcast stream transmitting apparatus 103 transmits the update data based on the priority as described above is applied to the state described in FIGS. 11A and 11B, the broadcast recorded in the broadcast stream recording apparatus The data is as shown in FIG.

  As described above, since the broadcast stream transmitting apparatus 103 transmits update data based on the priority of each frame of the update data, the update data received by the broadcast stream recording apparatus 102 is shown in FIG. As shown in FIG. 4, there are four frames of the fifth and ninth I frames and the third and fourth P frames.

  Here, in the same figure (c), when the unreproducible frame is seen, it becomes only the sixth to eighth frames that could not be received due to the disconnection of the communication line. Therefore, in FIG. 3C, the number of frames that cannot be reproduced is three frames.

  As a result, compared to the case where the broadcast stream transmitting apparatus 103 transmits the update data without setting the priority for the update data, the case where the update data is transmitted with the priority set for the update data is reproduced. The number of possible frames increases.

  As described above, the broadcast stream transmitting apparatus 103 sets the priority for the update data, and transmits the update data based on the priority, so that the broadcast stream recording apparatus 102 can reliably transmit the highly important broadcast data. Can be sent to.

(Modification of Broadcast Stream Recording Device 102)
The broadcast stream recording device 102 described above functions as a terminal that receives broadcast data from the broadcast station 101 and update data from the broadcast stream transmission device 103 and records the broadcast data on its own recording medium 209. It is what has. However, the present invention is not limited to this, and the configuration of the configuration of the broadcast stream recording apparatus 102 and the configuration of the broadcast stream recording apparatus 103 as shown in FIG. . FIG. 4 is a block diagram illustrating a configuration of the broadcast stream recording apparatus 105.

  As shown in the figure, the broadcast stream recording apparatus 105 has a function as a terminal of the broadcast stream recording apparatus 102 and a function as a server of the broadcast stream transmission apparatus 103. A transmission data detection unit 212, and a retransmission control unit 207 that is not included in the configuration of the broadcast stream transmission apparatus 103.

  Note that the functional operation of each block included in the broadcast stream recording apparatus 105 is the same as the functional operation of each block corresponding to the broadcast stream recording apparatus 102 and the broadcast stream transmission apparatus 103, and thus description of the functional operation is omitted here. .

(Modification of Broadcast Stream Transmission Device 103)
The broadcast stream transmitting apparatus 103 described above is configured to receive broadcast radio waves from the broadcast station 101 and acquire broadcast data. However, the present embodiment is not limited to this, and the broadcast data to be acquired may be acquired from a server or the like that records the broadcast data via the Internet. When acquiring broadcast data via the Internet, the broadcast stream transmitting apparatus has the configuration of the broadcast stream transmitting apparatus 106 shown in FIG. FIG. 14 is a block diagram showing a configuration of the broadcast stream transmitting apparatus 106.

  As shown in the figure, the broadcast stream transmitting apparatus 106 includes a recording medium 209, a read control unit 208, transmission data 212, and a network interface unit 206. Note that the functional operation of each block constituting the broadcast stream transmitting apparatus 106 is the same as the functional operation of each block corresponding to the broadcast stream transmitting apparatus 103, and thus description of the functional operation is omitted here.

  In the present embodiment, the broadcast stream recording apparatus 102 transmits a boundary ID to the broadcast stream transmitting apparatus 103 in order to designate broadcast data corresponding to the reception error location. However, the present invention is not limited to this, and the broadcast data corresponding to the reception error location may be designated by the value of the data length of the broadcast data constituting the broadcast content instead of the boundary ID. Specifically, in the broadcast data constituting the broadcast content, the data length from the beginning of the broadcast data to the location where the occurrence of the reception error starts, and from the location where the reception error occurrence ends to the end of the broadcast data. Broadcast data corresponding to a reception error location may be designated by the data length.

  In the present embodiment, the broadcast stream recording device 102 and the broadcast stream recording device 103 are configured to incorporate the recording medium 209 for recording broadcast data, but the present invention is not limited to this. The external recording device may be detachable from the broadcast stream recording device 102 and the broadcast stream recording device 103.

(Program-related invention)
Note that each unit included in the broadcast reception stream recording / playback device and each unit included in the data playback device may be configured by hardware logic, or a calculation unit such as a CPU may be a ROM (Read Only Memory) or You may be the structure implement | achieved by running the program memorize | stored in memory | storage means, such as RAM.

  When each of the above-described configurations is configured by calculation means such as a CPU and storage means, a computer having these means reads the recording medium on which the above-mentioned program is recorded and executes the program so that various functions of the above-described units and Various processes can be realized. In addition, by recording the program on a removable recording medium, the various functions and various processes described above can be realized on an arbitrary computer.

  This recording medium may be a program medium such as a memory (not shown) such as a ROM for processing by a computer, or a program reader as an external storage device (not shown). The program medium may be readable by inserting a recording medium therein.

  In any case, the stored program is preferably configured to be accessed and executed by the microprocessor. Furthermore, it is preferable that the program is read out, and the read program is downloaded to a program storage area of the microcomputer and the program is executed. It is assumed that this download program is stored in advance in the main unit.

  In addition, if the system configuration is capable of connecting to a communication network including the Internet, the recording medium is preferably a recording medium that fluidly carries the program so as to download the program from the communication network.

  Further, when the program is downloaded from the communication network as described above, it is preferable that the download program is stored in the main device in advance or installed from another recording medium.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. That is, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

  The information storage medium of the present invention may be configured as follows.

(First configuration)
A tuner for receiving broadcast waves, a data error / reception insensitivity detection unit for detecting at least one of data error and reception insensitivity of the received broadcast stream, and a stream division unit for dividing the broadcast stream into predetermined units, Control is performed to write the broadcast stream and the generated ID value to a recording medium based on a detection result by the data error / reception deadness detection unit and an ID generation unit that generates an ID value for the divided stream. A write control unit, a read control unit for reading a broadcast stream and ID value stored in the recording medium, a retransmission control unit for determining ID values before and after reception failure, and performing broadcast stream request control therebetween, and other devices Through a network, send out the preceding and following ID values, and receive the corresponding broadcast data. A work interface unit, the write control unit, if there is no correct broadcast stream due to data error or reception insensitivity, leave that area, and then when the broadcast data is obtained via the network, A broadcast stream recording apparatus for recording a received broadcast stream, wherein the broadcast stream is recorded in the empty area.

(Second configuration)
The broadcast control apparatus according to the first configuration, wherein the write control unit stores only ID values before and after reception failure.

(Third configuration)
The broadcast control apparatus according to the first configuration or the second configuration, wherein the write control unit writes dummy data when there is no broadcast stream.

(Fourth configuration)
The writing control unit writes the dummy data up to the access unit of the recording medium when the broadcast stream does not exist, and stops writing until the broadcast stream is received again. 2. A broadcast stream recording apparatus according to the configuration of 2.

(Fifth configuration)
When a broadcast stream and a recording medium in which an ID value generated for each unit obtained by dividing the broadcast stream is stored in advance and connected to another device via a network and receiving an ID value from another device, If there is broadcast data corresponding to it, it is determined by reading the ID on the recording medium whether the network interface part that transmits it and the broadcast stream including the ID value received from the other device are stored in the recording medium, A broadcast stream transmission apparatus comprising: a transmission data detection unit that controls to transmit a corresponding broadcast stream to another device if it exists.

(Sixth configuration)
6. The broadcast stream transmission apparatus according to the fifth configuration, wherein the transmission data detection unit sets the priority of a broadcast stream to be transmitted, and transmits the broadcast stream from the highest priority.

(Seventh configuration)
In the fifth configuration or the sixth configuration, the priority is determined based on an encoding mode of a video signal included in a broadcast stream, and increases the priority of what is encoded in the screen. Such a broadcast stream transmission device.

(Eighth configuration)
The ID generation unit obtains the divided stream by combining a conversion value that is a unique value for each divided stream obtained by a predetermined function and content identification information. A broadcast stream recording apparatus according to any one of the first to fourth configurations.

(Ninth configuration)
The ID is obtained by combining a conversion value that is a unique value for each divided stream obtained by dividing the divided stream by a predetermined function and content identification information. A broadcast stream transmission apparatus according to any one of the configurations 7 to 7.

(10th configuration)
The broadcast stream recording / reproducing apparatus according to any one of the first to ninth configurations, wherein the predetermined function is a hash function.

  The present invention provides a broadcast stream recording apparatus capable of managing one broadcast content to be recorded on a recording medium by one file even when a broadcast stream is acquired from an external apparatus different from the broadcast station. In particular, it can be used in a mobile phone or a personal digital assistant capable of receiving broadcast radio waves.

It is a block diagram which shows the structure of the broadcast stream recording apparatus based on embodiment of this invention. It is explanatory drawing which shows the structure of the whole system by which the broadcast stream recording apparatus based on embodiment of this invention operate | moves. It is a block diagram which shows the structure of the broadcast stream transmission apparatus based on embodiment of this invention. It is a block diagram which shows the structure of the broadcast stream recording apparatus which has a function of the broadcast stream transmission apparatus based on embodiment of this invention. It is a block diagram which shows the structure of the ID production | generation part based on embodiment of this invention. (A) is explanatory drawing which shows the broadcast data containing the reception error received from the broadcasting station based on Embodiment of this invention, (b) is a reception error location based on Embodiment of this invention. It is explanatory drawing which shows the broadcast data which recorded dummy data in (c), It is explanatory drawing which shows the update data acquired from the broadcast stream transmission apparatus based on embodiment of this invention. It is a sequence diagram which shows the flow of the update data acquisition in the broadcast stream recording apparatus and broadcast stream transmission apparatus based on embodiment of this invention. It is a sequence diagram which shows the flow from boundary ID reception to update data transmission in the broadcast stream transmission apparatus based on embodiment of this invention. It is explanatory drawing which shows the process of the successive comparison with boundary ID and preservation | save ID in the transmission data detection part based on embodiment of this invention. It is explanatory drawing which shows the priority and update data of broadcast data in the broadcast stream transmission apparatus based on embodiment of this invention. (A)-(c) is explanatory drawing which shows the priority of the broadcast data in the broadcast data transmitter which concerns on embodiment of this invention. It is explanatory drawing which shows the relationship between the broadcast stream received from the broadcasting station in the prior art example, and the update data corresponding to a reception error location. (A)-(c) is explanatory drawing which shows the relationship between the broadcast data recorded on the recording medium based on Embodiment of this invention, and a cluster. It is a block diagram which shows the structure of the broadcast stream transmission apparatus which acquires a broadcast stream via the internet based on embodiment of this invention.

Explanation of symbols

101 broadcast station 102 broadcast stream recording device 103 broadcast stream transmission device (external device)
105 Broadcast Stream Recording Device 106 Broadcast Stream Transmitting Device (External Device)
202 Error detection unit (detection means)
204 ID generation unit (generation means)
205 Write controller (recording means)
206 Network interface unit (acquisition means)
207 Retransmission control unit 208 Reading control unit 209 Recording medium 210 Stream division unit (division means)
212 Transmission data detection unit (transmission means, setting means)

Claims (13)

A broadcast stream recording apparatus comprising recording means for recording a broadcast stream received from a broadcasting station on a recording medium,
Detecting means for detecting a defective portion of data in the received broadcast stream;
An acquisition means for acquiring normal data corresponding to the detected defect location from an external device;
The recording means is
Among the received broadcast streams, normally received data other than the defective part detected by the detection means are recorded together as one recorded broadcast stream including an area corresponding to the defective part,
A broadcast stream recording apparatus, wherein when the normal data is acquired by the acquisition means, the normal data is additionally recorded in the recorded broadcast stream. The recording means is
In addition to recording any dummy data in the area corresponding to the above defect location,
The broadcast stream recording apparatus according to claim 1, wherein when the normal data is acquired by the acquisition unit, the normal data is overwritten on the dummy data. The recording means is
When the defective portion is detected by the detecting means, arbitrary dummy data is recorded up to one access unit in the recording medium in the area corresponding to the defective portion,
2. The recording of the dummy data on the recording medium is stopped while the defective portion continues to be detected by the detecting unit after the dummy data is recorded up to the access unit. 3. Broadcast stream recording device. Dividing means for dividing the received broadcast stream into partial streams having a predetermined data length;
Generating means for generating, for each partial stream, an identifier for individually identifying the partial stream,
The detection means detects a defective portion of the data for each partial stream,
The recording means records the normally received partial streams together as the recorded broadcast stream, and at least the identifiers of normal partial streams located before and after the defective portion among the generated identifiers. The broadcast stream recording apparatus according to claim 1, wherein the broadcast stream recording apparatus records on the recording medium.   5. The broadcast according to claim 4, wherein the generation unit generates the identifier for each partial stream by combining the predetermined function for generating the identifier and the content information of the broadcast stream. Stream recording device.   6. The broadcast stream recording apparatus according to claim 5, wherein the predetermined function is a hash function.   7. The recording device according to claim 4, wherein the recording unit records, on the recording medium, only the identifiers of normal partial streams located before and after the defective portion among the generated identifiers. The broadcast stream recording apparatus according to item 1.   The broadcast according to any one of claims 1 to 6, further comprising transmission means for reading out the partial stream requested to be transmitted from the outside from the recording medium and transmitting the partial stream to the outside. Stream recording device. Setting means for setting a priority for each partial stream in the recorded broadcast stream;
9. The broadcast stream recording apparatus according to claim 8, wherein the transmission means transmits the partial stream set with a higher priority to the outside with higher priority.   The setting means sets the priority set for the partial stream to be subjected to the intra-screen encoding higher than the priority set for the other partial streams, based on the encoding information of the video signal in the broadcast stream. The broadcast stream recording apparatus according to claim 9. A broadcast stream recording method comprising a recording step of recording a broadcast stream received from a broadcasting station on a recording medium,
A detection step of detecting a defective portion of data in the received broadcast stream;
An acquisition step of acquiring normal data corresponding to the detected defect location from an external device;
In the above recording step,
Among the received broadcast streams, normally received data other than the defective part detected by the detection step is recorded together as one recorded broadcast stream including an area corresponding to the defective part,
A broadcast stream recording method, wherein when the normal data is acquired in the acquisition step, the normal data is additionally recorded in the recorded broadcast stream.   A broadcast stream recording program for operating the broadcast stream recording apparatus according to any one of claims 1 to 11, wherein the broadcast stream recording program causes a computer to function as each of the above means.   A computer-readable recording medium on which the broadcast stream recording program according to claim 12 is recorded.

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