JP2001333375A - Multiplexed broadcast signal recording device and multiplexed broadcast signal recording / reproducing device - Google Patents

Abstract

(57) [Problem] To provide a digital broadcast signal recording device and a recording / reproducing device capable of judging the start of a program or switching of a program in digital broadcasting and automatically starting recording at the start of the program. SOLUTION: In digital broadcasting, a TS packet in which subtitles are transmitted based on data in a multiplex stream is detected, and the detection of a packet transmitting subtitles is determined to be the start of a program or switching of the next program. , The recording means starts recording the program from the recording pause state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a multiplexed broadcast signal recording apparatus and a multiplexed broadcast signal recording / reproducing apparatus for receiving a multiplexed broadcast, for example, a digital broadcast, and recording the received multiplexed broadcast signal.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a configuration example of a conventional digital broadcast receiver 200 provided with a recording / reproducing means for recording / reproducing a digital broadcast signal. Tuner 1 that receives digital broadcast signal received by antenna
Performs channel selection based on control data indicating a selected channel from a control CPU (Central Processing Unit) 9. The received signal of the selected channel is sent to the demodulation unit 2, and the demodulation unit 102 performs digital demodulation. For example, if the digital broadcast signal is MPEG
2 is multiplexed according to the system of Moving Picture Experts Group 2 (Transport Picture Experts Group 2).
Stream) signal TS is obtained. The transport stream signal TS has a configuration multiplexed in units of packets called transport packets, and each transport packet is set for each transmission signal such as video, audio, and data information.

The transport stream signal TS is transmitted via a descrambler 3 to a packet separator (DEMU).
X: demulitiplexer) 4 and recording / reproducing means 5. The descrambling means 3 has a function of canceling the scramble applied to the transport stream signal TS.

The transport stream signal TS obtained from the descrambling means 3 or reproduced from the recording / reproducing means 5 to be described later is input to the packet separating means 4, and one of the transport stream signals TS is included in control data from the control CPU 9. Selected based on In the packet separating means 4, for each program,
Transport packets for video data and audio data of the program (hereinafter, "video packets",
"Audio packet") from the transport stream signal TS. If subtitle data accompanies this program, a transport packet (hereinafter, referred to as “subtitle packet”) for subtitle data is present in the transport stream signal TS, so that it is also separated.

[0005] The video packet, the audio packet, and the subtitle packet are supplied to a video decoding unit 6, an audio decoding unit 8, and a subtitle processing unit 7, respectively.
It is decoded into a caption signal. These are provided to the combining means 11 and combined, and then provided to the display device 13 for display.

On the other hand, the transport stream signal TS is also input to the recording / reproducing means 5, and is used for recording a received program. The program to be recorded is recorded in units of transport packets based on the packet identification information PID (Program IDentification) of the program.

[0007] Recording by the recording / reproducing means 5 is started when control data R0 indicating the start of recording is given from the control CPU 9. The control data R0 is transmitted, for example, by a viewer performing a recording instruction operation on the control CPU 9 using a remote controller (abbreviated as “remote controller” in the figure) 12.
It is provided to the recording / reproducing means 5. Alternatively, when a program reservation has been made, the control CPU 9 sends control data R0 indicating the start of recording at the designated reservation time.

[0008] The transport stream signal TS recorded in this way, when reproduced by the recording / reproducing means 5, is given to the packet separating means 4.

[0009]

In the digital broadcast receiver configured as described above, when recording the program, the viewer may give an instruction to start recording by operating the remote controller 12 or may designate the recording in advance. In any case where a reservation is made to start recording at the set time, recording is started regardless of whether a transport packet of a program to be recorded is input.

[0010] Therefore, when the transport packet is input first and the separation processing or the like is performed with respect to the time when the recording start instruction is issued, the start of the recording is in the middle of the program, and when the transport packet is input later. Means that a transport packet of dummy data is recorded. In other words, there is a problem that the input of the transport packet of the program to be recorded and the start of recording cannot be performed in synchronization with each other, that is, the recording of the program cannot be automatically performed in synchronization with the start of the program. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in a multiplexed broadcast, a multiplexed broadcast signal recording apparatus and a recording apparatus capable of automatically starting recording at the start of a program. It is intended to obtain a playback device.

[0012]

Means for Solving the Problems Claim 1 of the present invention
Is demodulated from a multiplexed broadcast signal in which video data and subtitle data are multiplexed, and a video packet that is a packet for the video data, and a subtitle packet that is a packet for the subtitle data. A multiplexed broadcast signal recording device comprising: a demodulation means for obtaining a demodulated signal having the same; and a recording means for starting recording of the demodulated signal upon detection of the caption packet.

[0013] The invention according to claim 2 is as follows.
2. The multiplexed broadcast signal recording device according to claim 1, further comprising a transmission unit that receives a detection signal indicating detection of the caption packet and outputs a recording start signal to the recording unit.

According to a third aspect of the present invention,
3. The multiplex broadcast signal recording device according to claim 2, further comprising: a caption packet detecting unit that detects the caption packet and outputs the detection signal.

According to a fourth aspect of the present invention,
4. The multiplex broadcast signal recording device according to claim 3, wherein the caption packet detection unit determines whether or not the packet is a caption packet based on an identifier in a PES header in the packet.

According to a fifth aspect of the present invention,
3. The multiplexed broadcast signal recording device according to claim 2, further comprising a packet separating unit that separates the video packet and the subtitle packet from the demodulated signal, wherein the packet separating unit outputs the detection signal. A detection signal transmitting unit;

According to a sixth aspect of the present invention, there is provided:
6. The multiplexed broadcast signal recording device according to claim 2, wherein the recording unit is set to a recording standby state before the recording start signal is supplied to the recording unit. The apparatus further includes control means for providing control data to the recording means.

According to a seventh aspect of the present invention,
7. The multiplex broadcast signal recording device according to claim 6, wherein the subtitle packet is detected first after the recording standby state starts, and the recording start signal is issued.

According to the eighth aspect of the present invention,
8. The multiplexed broadcast signal recording device according to claim 7, wherein recording of the demodulated signal is started upon detection of a caption packet of the caption data having a content related to the content of the video data.

According to a ninth aspect of the present invention, there is provided:
A multiplexed broadcast signal recording device according to any one of claims 1 to 8, wherein the recording means also functions as a reproduction means for reproducing the recorded contents, and the reproduced demodulated signal is A multiplex broadcast signal recording / reproducing device that is separated into a video packet and the subtitle packet.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing an example of the configuration of a digital broadcast receiver 101 provided with a recording / reproducing means for recording / reproducing a digital broadcast signal according to Embodiment 1 of the present invention. Similarly to the conventional digital broadcast receiver 200, the digital broadcast receiver 101 has a tuner 1, a demodulating unit 2, a descrambling unit 3, a packet separating unit 4, a recording and reproducing unit 5, a video decoding unit 6, an audio decoding unit 8, a subtitle. Processing means 7, synthesis means 11
It has. These are all connected to the control means 9A, and the operation is controlled by control data to be provided from this. Further, a remote controller 12 capable of transmitting a signal to the control means 9A and a display device 13 are further provided. As the control unit 9A, for example, a known CPU can be employed.

The digital broadcast signal received by the receiving antenna is input to tuner 1. The tuner 1 is provided with control data indicating a channel to be selected from the control means 9A, performs a tuning process, and selects a predetermined channel of digital broadcasting.

The digital broadcast signal of the selected channel is sent to the demodulation means 2. The demodulation means 2 performs digital demodulation. For example, according to control data indicating a program to be selected from the control means 9A, a transport signal TS including a predetermined program is selected and output. Such a channel and a program to be selected are designated by giving a control data to the control means 9A by operating the remote controller 12 by a viewer who has confirmed an electronic program guide (EPG) described later, for example. Is done.

The transport stream signal TS is sent to the packet separating means 4 and the recording / reproducing means 5 via the descrambling means 3. The descrambling means 3 has a function of canceling the scramble applied to the transport stream signal TS. For example, the above-described scramble is performed on the transport stream signal TS for a program such as a pay broadcast, which is permitted to be viewed in a limited manner.

The range of scrambling in ordinary conditional access is the payload of the transport packet, and the descrambling process on the header and the adaptation field of the transport packet is excluded. Also, a transmission control signal PSI (Program Specific Infor
mation), program arrangement information SI (Service Informatio
n), individual information EMM (Entitlement Management Messag)
e), program information / control information ECM (Entitlement Control)
Message) is not subject to scrambling. Whether or not the payload is scrambled and its type can be determined from the scramble control value included in the header of the transport packet.

In the packet separating means 4, the individual information EMM
And the program information / control information ECM are extracted from the transport stream signal TS and provided to the IC card 10 via the control means 9A. The IC card 10 collates the viewing information stored in advance with the individual information EMM and the program information / control information ECM, extracts the key information, and extracts the key information.
Give to. The controller 9A sends the scramble key Ks to the descrambler 3 based on the key information. The descrambling means 3 performs a process of descrambling based on the scramble key Ks and the scramble control value.

In the packet separating means 4, the transport stream signal T output from the descrambling means 3 is output.
The transmission control signal PSI, time information, and the like are extracted from S and transmitted to the control means 9A as control information. The control unit 9A returns the control data to the packet separating unit 4 based on these, and the packet separating unit 4 executes the separating process based on this.

The program arrangement information SI is also multiplexed as transport packets in the transport stream signal TS, and is separated by the packet separating means 4.
The program arrangement information SI includes data indicating information such as the channel name of the service, the title of each program, the start / end time, the duration, the content, the progress status, and the like. Using this, a screen of the electronic program guide EPG, which is a program list, can be created and displayed, which can be provided for the convenience of the viewer to select a program. Of course, it is also possible for the viewer to operate the remote controller 12 to give control data to the control means 9A so that the electronic program guide EPG is not displayed.

In this embodiment, it is assumed that the selected program is accompanied by subtitle data. The subtitle data is roughly divided into subtitles having contents related to the video and audio contents of the program (hereinafter, referred to as “program subtitles”) and subtitles having no relation, for example, a flash report (hereinafter, referred to as “information subtitles”). There are two types. These may be multiplexed as transport packets in the transport stream signal TS independently of video packets and audio packets, or may be sent in the user data area of the picture layer in video data. In this embodiment, the domestic BS (Br
An example in which subtitle data is provided as subtitle packets, which are independent transport packets, according to an oadcasting satellite digital broadcast.

The packet separating means 4 separates video packets, audio packets and subtitle packets of the program from the transport stream signal TS for each program. These separated transport packets are sent to the video decoding unit 6, the audio decoding unit 8, and the subtitle processing unit 7.

The video data is encoded by the MPEG2 system. The video decoding means 6 decodes the video data based on the control data given from the control means 9A and outputs a video signal. At the time of decoding, data such as a sequence header and a sequence end code in the video data are identified, and a video format based on an image size, an aspect ratio, a scanning method and a frame frequency, a sequence start, and a sequence end code are detected (sequence end). Is transmitted to the control means 9A.

The audio data is also encoded, and the audio decoding means 8 decodes the audio data based on the control data supplied from the control means 9A and outputs an audio signal. At the time of decoding, data such as a header in audio data is identified, and data indicating information such as an audio format based on a sampling frequency, the number of audio channels, and the like is sent to the control unit 9A.

The subtitle processing means 7 performs a predetermined process on the input subtitle data based on the control data supplied from the control means 9A to obtain a subtitle signal, which is then synthesized.
Send to 1.

The control means 9A generates control data for the synthesizing means 11 to perform the synthesizing process based on the data of the above-mentioned video format, audio format and the like and the presence or absence of subtitle data, and supplies the control data to the synthesizing means 11. Combining means 11
Then, the decoded video signal, audio signal, and caption signal are synthesized based on the control data. The output after the synthesis is provided to the display device 13 and displayed.

Specifically, when there is a subtitle signal, the synthesizing means 11 superimposes the subtitle signal on the video signal, and uses the video signal and the audio signal on which the subtitle is superimposed as a display signal, and sends this to the display device 13. Output. Then, the display device 13 displays video and audio with subtitles according to the input display signal.
Of course, when there is no caption signal, or when the viewer sends, for example, the remote controller 12 not to display the caption to the control means 9A as control data, the video signal and the audio signal on which the caption is not superimposed are displayed. It is provided to the display device 13 as a signal.

In the present invention, the caption packet is detected not only by the packet separating means 4 but also by the caption packet detecting means 14 provided in the digital broadcast receiver 101. The caption packet detection means 14 is also supplied with the transport stream signal TS from the descrambling means 3, and when detecting a caption packet therein, supplies a detection signal D to the control means 9A.

FIG. 2 shows a control means 9 for recording a program.
FIG. 3A is a block diagram showing the exchange of signals between the recording / reproducing means 5 and the caption packet detecting means 14, and FIG. 3 is a flowchart for explaining the operation of starting recording. When recording a program, first, in step S1, a program to be recorded is specified. Specifically, for example, when the viewer operates a recording start instruction or program recording reservation using the remote controller 12 a predetermined time before the start time of the program to be recorded, the instruction content is changed by the control means. It is sent to 9A.

Next, at step S2, the control means 9A
The control data F1 for instructing the recording standby state (recording pause state) is sent to the recording / reproducing means 5. In response to this, the recording / reproducing means 5 enters a recording standby state. Further, the control means 9A gives the control data F2 to the caption packet detecting means 14, thereby causing the caption packet detecting means 14 to identify the presence or absence of a caption packet. Caption packet detecting means 14
In PES, the PES (Pack
From the identifier in the (etized Elementary Stream) header, it is determined whether or not the transport packet is a subtitle packet, and preferably, whether the transport packet is a program subtitle or an information subtitle.

Thereafter, in step S3, the caption packet detecting means 14 transmits the transport stream signal TS
When a caption packet from the PC, preferably a caption packet for a program caption, is detected, a detection signal D is provided to the control means 9A. The control means 9A includes a transmission means 8 for transmitting a recording start flag, and the detection signal D is given to the transmission means 8.

Upon receiving the detection signal D in step S4, the transmitting means 8 determines whether or not the first subtitle packet has been detected after entering the recording pause state. If it is the first detection, the process proceeds to step S5,
A is a recording start flag R as control data from the transmitting means 8.
1 is transmitted to the recording / reproducing means 5.

Upon receiving the recording start flag R1, the recording / reproducing means 5 selectively records the transport stream signal TS input from the descrambling means 3 in packet units in step S6. The recording / reproducing unit 5 records a transport packet having the packet identification information PID of the program to be recorded based on the control data from the control unit 9A.

Since the program subtitle is a subtitle directly related to the content of the video or audio, if this is detected first, it is determined that the program is switched to the next program at a break in the program or that the program is started. it can. A subtitle packet from the subtitle packet detecting means 14, particularly a subtitle packet of a program subtitle, is detected, and if this is the first subtitle packet, it is determined that it is time to start a program or switch to the next program, and a recording start flag is set. The recording start flag R1 is transmitted from the transmitting means 8 to the recording / reproducing means 5, and recording of the program is started.

Note that detection of subtitle packets continues to be performed even after recording of a program is started. Therefore, as shown by the broken line in FIG. 3, although the operation for starting recording is not described, the process proceeds from step S6 to step S3. In this case, the detected caption packet is determined not to be the first detection in step S4.
The process proceeds to 7. In step 7, the recording start flag R
1 is not transmitted, and the recording / reproducing means 5 continues the recording operation as it is.

As described above, from the multiplexed transport stream signal TS, the caption packet detecting means 14 has selected the caption packet, preferably the program caption, when the transmission of the caption packet of the program caption was first detected. Since the recording and reproduction means 5 starts recording of the program, the viewer does not need to instruct the start of recording from the remote controller 12 or the like at the same time as the start of the program. Will automatically start recording.

[0045] Then, the viewer operates the remote controller 1.
When an instruction to stop recording is given in 2 or the like, or when a predetermined time has come, the recording / reproducing means 5 stops recording according to control data from the control means 9A.

When the recording / reproducing means 5 performs a reproducing operation,
The transport stream signal TS subjected to the reproduction processing is sent to the packet separating means 4. The packet separating means 4 converts one of the transport stream signal TS from the descrambling means 3 and the transport stream signal TS reproduced by the recording and reproducing means 5 into the control means 9A.
And performs the above-described separation processing. Normally, when the recording / reproducing means 5 performs a reproducing operation,
The transport stream signal TS to be output is separated by the packet separating means 4. However, even during the reproduction operation, the packet separating means 4 may perform the above-described separating process on the transport stream signal TS from the descrambling means 3 and display the contents.

Embodiment 2 In the first embodiment,
A caption packet detecting means 14 is provided to detect the presence or absence of a caption packet. However, in the present embodiment, when separating a video packet, an audio packet, and a caption packet from the transport stream signal TS, it is determined whether or not a caption packet is detected.

FIG. 4 is a block diagram showing an example of the configuration of a digital broadcast receiver 102 provided with recording / reproducing means for recording / reproducing a digital broadcast signal according to Embodiment 2 of the present invention.

The digital broadcast receiver 10 shown in FIG.
Compared to the digital broadcast receiver 1, the digital broadcast receiver 102 does not have the caption packet detecting means 14, but has a configuration in which the packet separating means 14 is replaced by a packet separating means 4A.
The packet separating means 4A has a caption packet detection signal transmitting section 4b, and has not only a function of separating video packets, audio packets, and caption packets from the transport stream signal TS, but also the presence or absence of a caption packet by the packet detection signal transmitting section 4b. Has a function of outputting a detection signal D indicating the following.

Therefore, also in the present embodiment, the transmitting means 8 which has inputted the detection signal D transmits the recording start flag R1 to the recording / reproducing means 5 in the recording standby state, and this triggers the recording / reproducing means. 5 is the same as the first embodiment in that recording is started, and the same effect as in the first embodiment can be obtained.

[0051]

According to the multiplex broadcast signal recording apparatus according to the first to sixth aspects of the present invention, the detection of the transmission of the subtitle packet triggers the recording of the selected program to the recording / reproducing means 5. Is started, there is no need for the viewer to instruct the start of recording from the remote controller 12 or the like in accordance with the start of the program, and the recording of the program is automatically started even when the program is reserved.

According to the multiplexed broadcast signal recording apparatus of the present invention, recording of a program starts when a caption packet is detected first after the recording standby state starts. Therefore, recording is automatically started at the start of the program.

According to the multiplexed broadcast signal recording / reproducing apparatus of the ninth aspect of the present invention, the contents recorded by the multiplexed broadcast signal recording apparatus of the first to eighth aspects are reproduced.

[0054]

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a configuration of a digital broadcast receiver according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a part of the configuration of the digital broadcast receiver according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating an example of an operation of the digital broadcast receiver according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a configuration of a digital broadcast receiver according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration example of a conventional digital broadcast receiver.

[Explanation of symbols]

2 demodulation means, 4,4A packet separation means, 4b caption packet detection section, 5 recording / reproduction means, 9A control means,
14 Caption packet detecting means, 8 transmitting means.

Claims (9)

[Claims] A demodulated broadcast signal in which video data and subtitle data are multiplexed is demodulated to convert a video packet that is a packet for the video data and a subtitle packet that is a packet for the subtitle data. A multiplexed broadcast signal recording device, comprising: a demodulation unit for obtaining a demodulated signal having the same; and a recording unit for starting recording of the demodulated signal in response to detection of the caption packet. 2. The multiplex broadcast signal recording device according to claim 1, further comprising a transmission unit that receives a detection signal indicating detection of the caption packet and outputs a recording start signal to the recording unit. 3. The apparatus further comprises: a caption packet detecting unit that detects the caption packet and outputs the detection signal.
The multiplex broadcast signal recording device according to claim 2. 4. The multiplex broadcast signal recording apparatus according to claim 3, wherein said caption packet detection means determines whether or not the packet is a caption packet based on an identifier in a PES header in the packet. 5. The apparatus according to claim 2, further comprising: a packet separating unit that separates the video packet and the caption packet from the demodulated signal, wherein the packet separating unit includes a caption packet detection signal transmitting unit that outputs the detection signal. A multiplexed broadcast signal recording device as described in the above. 6. The recording apparatus according to claim 2, further comprising control means for supplying control data to said recording means for causing said recording means to be in a recording standby state before said recording start signal is supplied to said recording means. 6. The multiplexed broadcast signal recording device according to any one of 5. 7. The multiplex broadcast signal recording apparatus according to claim 6, wherein said subtitle packet is detected first after said recording standby state starts, and said recording start signal is issued. 8. The multiplexed broadcast signal recording apparatus according to claim 7, wherein the recording of the demodulated signal is started upon detection of a caption packet of the caption data having a content related to the content of the video data. . 9. A multiplexed broadcast signal recording device according to claim 1, wherein said recording means also functions as a reproducing means for reproducing the recorded contents, and The multiplexed broadcast signal recording / reproducing device, wherein the demodulated signal is separated into the video packet and the subtitle packet.