JP2003199008A - Broadcasting receiver with built-in recorder and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcasting receiver with a built-in recorder which removes useless data, selectively stores reproducible data and raises recording efficiency in the recorder and also to provide a recording method. <P>SOLUTION: When an MPU 14 receives a recording indication and starts a recording processing, a TSP 12 detects presence of an error based on the error indicator of a TS packet first. Unless the error exists, writing is performed in the recorder 15. When the error is detected, the occurrence of the error per unit time is observed and writing is not performed to the recorder when a value is equal to or more than a prescribed value. In this case, an error occurrence continuing time is recorded in a data management information area which is arranged in the recorder. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device built-in type broadcast receiving device for recording a received digital broadcast and a recording method.

[0002]

2. Description of the Related Art A satellite broadcasting format (digital broadcasting) by digital transmission has already been put to practical use. In this digital broadcasting, by adopting a high-efficiency compression coding technique, a broadcasting signal transmitted from a broadcasting station can be transmitted at a higher speed. A huge amount of information is transmitted. This transmitted information includes SI (used for program selection, etc.) such as information on video / audio signals (program information) forming program contents, information on data broadcasting, program name and program start / end time. Service In
information) is included.

These pieces of information are transmitted by a transport stream which is multiplexed / separated by a transport packet having a fixed length of 188 bytes. A code (error code) for detecting an error is added to this transport packet.

SI information is stored in a television receiver for displaying a program guide for program selection and program reservation. SI
In the case of information, if the received information contains an error,
Since this information is repeatedly received and error detection information other than the above error code is included, the transmission rate is not high, so that the error can be easily corrected. Therefore, the SI information is stored after correcting the error.

On the other hand, in the case of program information, if the received program information includes an error, MPEG (Moving)
It is corrected by a Picture Experts Group) decoder and output as video / audio to the television receiver. In addition, the received program information is stored in the HDD (Ha
A digital broadcast receiver for recording in a recording device such as rd Disk Drive has been proposed (Japanese Patent Laid-Open No. 2001-2001).
268516). In the receiving device incorporating this HDD, although video / audio can be recorded, there is a problem in that the soundness of all data cannot be investigated during recording.

[0006]

As described above, in the prior art,
When recording video / audio signals, all the data to be recorded is not checked. Therefore, when reproducing the recorded data, the data that cannot be reproduced is recorded, and the recording efficiency deteriorates. . In addition, there is a problem in that the state of this error is unknown even during reproduction.

It is an object of the present invention to provide a recording device built-in type broadcast receiving device and a recording method capable of selectively storing reproducible data by removing unnecessary data and improving recording efficiency of the recording device. .

[0008]

In order to achieve the above object, the recording method of the invention according to claim 1 is a transformer for receiving a digital broadcast signal and including a multiplexed packet carrying video information and audio information. In a recording method of readablely recording a desired transport stream in a recording device after demodulating the port stream, the transport stream is selectively recorded in the recording device based on error information of the transport stream. It is characterized by

According to a second aspect of the present invention, in the recording method according to the first aspect, the error information of the transport stream recorded in the recording device is recorded in the recording device in association with the transport stream. To do.

According to a third aspect of the present invention, there is provided the recording method according to the first aspect, wherein the error information is obtained based on an error indicator of a transport packet which constitutes a transport stream.

A recording method according to a fourth aspect of the present invention is characterized in that, in the first aspect, the error information is obtained based on the number of transport packets forming a transport stream per unit time. To do.

According to a fifth aspect of the present invention, there is provided the recording method according to the first aspect, wherein the error information is obtained based on PSI information in the transport stream.

A recording method according to a sixth aspect of the present invention is characterized in that, in the fifth aspect, the error information is obtained based on the PAT in the transport stream.

The recording method of the invention according to claim 7 is the recording method according to claim 5, wherein the error information is obtained based on the PMT in the transport stream.

According to another aspect of the present invention, there is provided a broadcast receiving device with a built-in recording device, which receives a digital broadcast signal, demodulates a transport stream including multiplexed packets carrying video information and audio information, and then outputs a desired signal. In a broadcast receiving device with a built-in recording device that rewritably records the transport stream of
Judgment means for judging an error of the transport stream based on the error information of the stream, selectively recording the transport stream in the recording device based on the judgment means, and recording the error information of the transport stream in the recording device It is characterized by having a control means.

According to a ninth aspect of the present invention, there is provided a broadcast receiving device with a built-in recording device, wherein when the transport stream recorded in the recording device is read out, it is recorded in association with the transport stream. It is characterized by outputting error information.

With such a configuration, it is possible to provide a recording device built-in type broadcast receiving device and a recording method capable of removing unnecessary data and selectively storing reproducible data to improve recording efficiency of the recording device. It will be possible.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an outline of a digital broadcasting system in which a television receiver for digital broadcasting according to an embodiment is used. Transmission information, which is a data group, from the digital broadcasting station 1
And is transmitted to each television receiver 3 as a digital broadcast signal. The transmission information includes video information, audio information, PSI (Program Spec
fic Information) information, SI (Sev)
ice Information) information and data broadcasting information are included.

The video information and the audio information form program content information. The PSI information is data for identifying a broadcast channel, and includes PAT (Program Associate).
onTable), PMT (Program Map T)
include). The SI information is program information used for program reservation, such as the program name and the start / end time of the program.

These pieces of information are transmitted as a transport stream. The MPEG2 transport stream is multiplexed / demultiplexed by a transport packet 4 having a fixed length of 188 bytes as shown in FIG. 2a.
As shown in FIG. 2b, the data of the transport packet 4 includes a header portion 4a indicating packet control information, an adaptation field 4b indicating dynamic state change information of an individual stream, and video and audio data. It is composed of a payload (48 bytes) 4c.

The header portion 4a includes a synchronization byte (8 bits) 4d which is a synchronization signal, an error indicator (1 bit) 4e which indicates the presence or absence of a bit error in the packet,
New PES (Packetized Element)
(ary Stream) packet is the transport
A unit start indicator (1 bit) 4f indicating that the packet starts from the payload, a transport packet priority (1 bit) 4g indicating the importance of this packet, stream identification information and an attribute of the individual stream of the packet. Indicating PID (Packet Identity
fication) (13 bits) 4h.

The header section 4a also includes a scramble control (2 bits) 4i indicating the presence or absence of scrambling of the payload of this packet, a type, an adaptation field control indicating the presence or absence of an adaptation field and the presence or absence of the payload in this packet ( 2 bits) 4
j, a cyclic counter (4 bits) 4k, which is information for detecting whether or not a packet having the same PID is partially discarded on the way.

Regarding the structure of the television receiver 3,
This will be described with reference to FIG. FIG. 3 shows a television receiver 3
2 is a block diagram illustrating the configuration of FIG. The television receiver 3 includes a demodulation stage 11 for demodulating a received broadcast signal, a transport stream processor (hereinafter referred to as TSP) 12 for decoding a transport stream (transport signal) output from the demodulation stage 11, T
An MPU (Micro Procedures) that processes the transport signal output from the SP 12 to the first signal line 13
data output from the sor unit) 14 and the MPU 14 is recorded, and the HDD (Hard Disk Drive) is recorded.
It has a recording device 15 consisting of e).

The MPU 14 is a RAM (Random Access) for temporarily storing data to be recorded in the recording device 15.
ss Memory) 14a. This MPU14
Error information indicating the presence or absence of an error in the TS packet signal based on the error indicator in the TS packet from the TSP 12 to the MPU via the second signal line 16.
14 is transmitted.

The recording device 15 records in the state of the transport stream shown in FIG. The signal recorded in the recording device 15 is reproduced by the MPU 1 during reproduction.
Under the control of No. 4, the signal is output to the third signal line 17, and MPE
It is applied to a G decoder (not shown). After that, the video
It is organized into an audio signal and finally output to a cathode ray tube and a speaker (not shown).

Next, the procedure of recording data in the recording device 15 of the television receiving device 3 will be described with reference to FIG. When the MPU 14 receives the recording instruction and starts the recording process, first, the TSP 12 detects the presence or absence of an error based on the error indicator of the TS packet (step 1). The detected error information is transmitted from the TSP 12 to the MPU 14. With this error information, T
If there is no error in the SP packet, the MPU 14 performs the writing process to the recording device 15 (step 2). This writing process is performed by the data (T
The S packet) is stored in the RAM 14a by a fixed amount and then written in the recording device 15.

When an error is detected from the error information, the MPU 14 observes the error occurrence per unit time (step 3). The data sent from the TSP 12 during this observation period is temporarily stored in the RAM 14a. When the error occurrence per unit time exceeds a certain limit, the data in error is finally not written in the recording device 15, but the data management information area provided in the recording device 15 The duration of error occurrence, for example, 5 minutes 10 seconds to 6 minutes 50 seconds is recorded as a part of the recorded data management information (step 4). This error information is displayed on a monitor when the data stored in the recording device 15 is reproduced.
Used. Here, the data management information includes information necessary for data management such as the entire recording time in addition to the above-mentioned error information.

When the error occurrence per unit time is within a certain limit, the writing process of the data to the recording device 15 is performed and the continuation time of the error occurrence is recorded in the data management information area (step 5).

Whether or not the recording is completed is detected (step 6). To continue recording, return to the beginning. If the recording has ended, the process ends.

In the above-mentioned embodiment, the recording method for detecting the error state of the received data by the error indicator in the TS packet and selectively recording the data has been described. However, the TS packet per unit time is described. The selective writing of data to the recording device by detecting the error state of the received data due to the fluctuation of the number will be described.

FIG. 5 is a flow chart showing a procedure for detecting the presence / absence of an error state of the received data based on the number of TS packets. First, the number of packets per fixed time is detected to obtain the number of packets per unit time (step 11).
Whether or not there is data of the number of packets per unit time of the previously recorded data is confirmed (step 12). The difference between the number of packets per unit time recorded last time and the number of packets per unit time detected this time is calculated (step 13). still,
When there is no previously recorded data, that is, when the data is recorded for the first time, the number of packets per unit time obtained in step 11 is recorded in the data management information area of the recording device (step 14) and the data is normal. Treat as a state. After that, a writing process to a recording device (not shown) is performed.

Next, the rapid change in the difference in the number of packets obtained in step 13 is monitored. That is, the value of the difference in the number of packets obtained in step 13 is compared with the maximum rate obtained from the PMT in the PSI information (step 15). If it is determined in step 15 that the maximum rate has been exceeded,
It is monitored whether this state continues for a certain period of time (step 16). If it continues for a certain period of time or more, it is determined that an error has occurred, and write-protection processing is performed. That is, the data determined to be in the error state is not written to the recording device, but the time information of the data that has not been written is written to the data management information area of the recording device. Step 16
In case of continuing within a certain time, return to step 11,
Perform predetermined processing.

If it is determined in step 15 that the maximum rate is not exceeded, it is verified whether the value of the number of error packets with respect to the number of received packets is a predetermined value or more (step 17). As a result of the verification, if it is equal to or larger than the predetermined value, it is regarded as a normal state and the writing process to the predetermined recording device is performed. On the other hand, if the value is equal to or more than the predetermined value, the process proceeds to step 16 and the continuation state of the state is determined, and then the predetermined process is performed.

Further, another embodiment will be described. In this other embodiment, the presence or absence of an error in the reception status is detected by monitoring the status of the received data by monitoring PSI information contained in the packet of the transport stream. That is, as described above, the PSI information includes a large number of individual video and audio streams contained in the transport stream. Therefore, which program is selected from a plurality of programs (programs) and which TS packet is extracted. Then, it is information about how to decrypt. From the contents, the television receiver repeats this PSI information at regular intervals (periodically).
Have acquired. Therefore, by monitoring this PSI information, it can be used as an index for judging the data reception state. The PSI information is PAT representing information in TS packet units and P representing service (program) units.
It is possible to know the data reception state from the reception state of any one of these information including MT.

A procedure for recording data in the recording device 15 in the television receiving device 3 using this PSI information will be described with reference to FIG. When the MPU 14 receives the recording instruction and starts the recording process, first, the TSP 12
Acquires PSI information (step 21). When the PSI information is acquired, the received data is determined to be in the normal state, and the MPU 14 performs the writing process to the recording device 15 (step 22). Since this writing process is the same as that described in the above-mentioned embodiment, the description thereof is omitted here.

When the PSI information cannot be acquired in step 21, the time when it cannot be acquired is observed and it is determined whether it is within a certain time (step 23). TSP during this observation period
The data sent from 12 is temporarily stored in the RAM 14a. When the time when the PSI information is not obtained exceeds a certain limit, the received data is judged to be in an error state, and the data during this time is not finally written to the storage device 15. However, the duration of error occurrence is recorded as a part of the data management information in the data management information area provided in the recording device 15 (step 24).

If the time during which the PSI information is not obtained in step 23 is within the predetermined time, the writing process of this data to the recording device 15 is performed and the continuation time of the error occurrence is recorded in the data management information area ( Step two
5).

Whether or not recording is completed is detected (step 2
6) When continuing recording, return to the beginning. If the recording has ended, the process ends.

[0039]

According to the invention described in detail above, a recording device built-in type broadcast receiving device and a recording method capable of removing unnecessary data and selectively storing reproducible data to improve the recording efficiency of the recording device. It is possible to provide.

[Brief description of drawings]

FIG. 1 is a block diagram showing a broadcasting system in which a television receiver according to an embodiment of the present invention is used.

FIG. 2 is a schematic diagram showing a transport stream transmitted in a broadcasting system.

FIG. 3 is a block diagram schematically showing a television receiver according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a broadcast signal recording method according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a broadcast signal recording method according to another embodiment of the present invention.

FIG. 6 is a flowchart showing a broadcast signal recording method according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Digital broadcasting station 2 ... Modulation stage 3 ... Television receiving device 4 ... Transport
Packet 11 ... Demodulation stage 12 ... Transport stream processor 13 ... First signal line 14 ... MPU 15 ... Recording device 16 ... Second signal line 17 ... Third signal line

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 20/18 570 G11B 20/18 574B 574 H04N 5/44 Z H04N 5/44 5/76 Z 5/76 5/91 LF term (reference) 5C025 CA20 CB10 DA01 DA04 DA10 5C052 AB04 CC11 CC12 DD04 EE03 5C053 FA20 FA23 GB06 GB11 GB14 GB15 GB38 JA01 5D044 AB05 AB07 BC01 CC04 DE47 DE53 EF05 GK08 GK12 HH17 HL11

Claims (9)

[Claims] 1. A digital broadcast signal is received, a transport stream including multiplexed packets carrying at least video information and audio information is demodulated, and then a desired transport stream is recorded on a recording device in a readable manner. In the recording method described above, the transport stream is selectively recorded in the recording device based on error information of the transport stream. 2. The recording method according to claim 1, wherein error information of the transport stream recorded in the recording device is recorded in the recording device in association with the transport stream. 3. The error information is obtained based on an error indicator of a transport packet forming a transport stream.
Recording method described. 4. The recording method according to claim 1, wherein the error information is obtained based on the number of transport packets forming a transport stream per unit time. 5. The recording method according to claim 1, wherein the error information is obtained based on PSI information in a transport stream. 6. The recording method according to claim 5, wherein the error information is obtained based on a PAT in a transport stream. 7. The recording method according to claim 5, wherein the error information is obtained based on a PMT in a transport stream. 8. A digital broadcast signal is received, a transport stream including multiplexed packets carrying video information and audio information is demodulated, and then a desired transport stream is recorded on a recording device in a readable manner. In the broadcast receiver with built-in recording device,
Judgment means for judging an error of the transport stream based on the error information of the stream, selectively recording the transport stream in the recording device based on the judgment means, and recording the error information of the transport stream in the recording device A broadcast receiving device with a built-in recording device, comprising a control means. 9. A transport recorded in a recording device.
9. The broadcast receiving device with a built-in recording device according to claim 8, wherein when reading the stream, the error information recorded in association with the transport stream is output.