JP2003143561A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly display broadcast data. SOLUTION: A recorder is provided with an input means which inputs a digital signal string of a designated channel out of a television broadcast signal received by a reception means, a recording means which extracts broadcast data related to programs broadcast on the designated channel from the inputted digital signal string and records information data of programs of the designated channel and extracted broadcast data on a storage medium, a reproducing means which reproduces the information data and the broadcast data from the storage medium, and a multiplexing means which multiplexes the broadcast data and the information data reproduced by the reproducing means at a prescribed timing to generate and output a multiplexed data string.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device, and more particularly to a device for recording data broadcasting data in a television broadcasting signal.

[0002]

2. Description of the Related Art In recent years, digital television broadcasting has attracted attention as a next-generation television broadcasting system. Therefore, digital TV broadcast reception decoder (hereinafter ST
B; called a set-top box), and digital TV using broadcasting satellites in Japan
Broadcast has started.

In digital TV broadcasting, not only broadcasting by audio and video, but also digital data called data broadcasting such as weather forecast and news are broadcast. In this data broadcasting, a relatively small amount of data is repeatedly transmitted from the broadcasting station so that the information of the data broadcasting can be displayed in the shortest possible time when the receiver switches channels or when the power is turned on.

On the other hand, in recent years, a technique for recording such a digital TV broadcast signal in a digital signal state has been considered. For example, a digital TV signal is received by STB, and a digital VTR such as DVHS is kept in the form of the digital signal.
It is conceivable to record the signal of the digital TV broadcast without deteriorating the signal by transmitting the signal.

Therefore, a recording device such as a digital VTR and an S
In connection with the TB, a connection using a digital interface such as IEEE1394 has been proposed instead of the conventional connection using analog input / output.

[0006]

As described above, the digital TV broadcast signal received by the STB can be recorded by the digital VTR, but in order to reduce the cost, the recording device has a decoder for video and audio data. However, it does not have a decoder (browser) for data broadcasting data. Therefore, in order for the user to view the recorded data broadcast, it is necessary to send the reproduced data broadcast data to the STB side and decode the data broadcast data on the STB side.

However, the received digital TV broadcast data string is recorded / reproduced by the recording device as it is, and STB
When a data broadcasting signal is decoded on the side, it takes time until the data necessary for decoding processing is detected by detecting the data broadcasting data multiplexed in the reproduced digital TV broadcasting data string, and the data broadcasting is displayed. It took time to get there.

In addition, in the recording / reproducing apparatus, in addition to normal reproduction, various operations such as fast-forwarding, stopping, and rewinding are often performed, and it is necessary to re-acquire the data broadcast data on the STB side each time. It took a long time to display.

An object of the present invention is to solve the above problems.

Another object of the present invention is to enable data broadcast data to be displayed quickly.

[0011]

In order to solve the above-mentioned problems, in the present invention, an input means for inputting a digital signal sequence of a designated channel in a television broadcast signal received by the receiving means, From the input digital signal sequence, the data of the data broadcast relating to the program broadcast on the specified channel is extracted, and the information data of the program of the specified channel and the extracted data broadcast data are extracted. Recording means for recording in a storage medium, reproducing means for reproducing the information data and the data broadcast data from the storage medium, and data broadcast data and information data reproduced by the reproducing means at a predetermined timing. Multiplexing means for multiplexing and generating and outputting a multiplexed data string is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 shows a digital recording apparatus 200 and a receiving apparatus (hereinafter referred to as S) connected to the digital recording apparatus 200 in a digital television broadcast recording system to which the present invention is applied.
It is a figure showing composition of TB) 100. In FIG.
The STB 100 and the recording device 200 are connected by a line L according to IEEE1394.

First, the structure of the STB 100 will be described.

First, a case where a program received by the tuner section 101 is displayed on an external display device to watch a program will be described.

In the STB 100, a signal supplied by an antenna or a cable (not shown) is supplied to the tuner unit 1.
01 is input. The tuner unit 101 performs processing such as demodulation and error correction on the received signal to generate a digital data string of a format called a transport stream (TS). Further, the generated TS data is output to the descrambler 103.

When descrambler 103 receives TS data scrambled for viewing restriction from tuner unit 101, descrambler key information for descramble included in the TS data and an IC card control unit (not shown). Descrambling is performed based on the key information output from the demultiplexer 103, and the result is output to the demultiplexer 103. When the descrambler 103 receives TS data that has not been scrambled from the tuner unit 101,
The TS data is output to the demultiplexer 105 as it is.

The demultiplexer 105 operates the operation unit 127 from the TS data string in which the video data, audio data, data for data broadcasting, etc. for a plurality of channels input from the descrambler 103 are time-division multiplexed. The video data D1 and the audio data D2 and the data broadcast data D3 relating to the program currently being broadcast on the selected channel are taken out, and the video decoder 107,
It outputs to the audio decoder 109 and the data decoder 111.

The video decoder 107 applies MPEG to the video data D1 input from the demultiplexer 105.
The decoding process of No. 2 is performed, and the decoded video data is output to the video control unit 113.

On the other hand, the data decoder 111 performs a decoding process on the data broadcast data D3 input from the demultiplexer 105, outputs the video signal in the decoded data broadcast data to the video control unit 113, and outputs the audio signal. Output to the voice control unit 114.

Based on the operation of the operation unit 127, the video control unit 113 synthesizes the video data of the decoded data broadcast program output from the data decoder 111 and the video signal output from the video decoder 107 to D / D. A converter 1
Output to 15. The D / A converter 115 is the video controller 11
The digital video data input from 3 is converted into an analog signal and output to the video output terminal 119. The video signal output terminal 119 outputs the video signal input from the D / A converter 115 to an external display device.

The audio decoder 108 MPs the audio data D2 input from the demultiplexer 105.
The audio decoding processing of EG2 is performed, and the decoded audio data is output to the audio control unit 114. Based on the operation of the operation unit 127, the audio control unit 114 appropriately selects the audio data of the decoded data broadcast program output from the data decoder 111 and the audio signal output from the audio decoder 109, and the D / A conversion unit 117. Output to. The D / A converter 117 converts the digital audio data input from the audio controller 114 into an analog signal, and outputs the audio output terminal 121.
Output to. The audio output terminal 121 is the D / A converter 11
The audio signal input from 7 is output to an external audio device.

Next, STB1 for recording the signal received by the tuner section 101 in the recording device 200
The operation of 00 will be described.

The television signal received by the tuner section 101 is output to the descrambler 103, processed as described above, and output to the demultiplexer 105.

When a channel is designated by the operation section 127 and a recording instruction is issued, the control section 125 records the data of the program broadcast on the designated channel in the recording device 20.
Demultiplexer 105 and I / F unit 1 to transmit to 0
Control 23.

When the control unit 125 receives an instruction from the operation unit 127 to request the program data transmission, the demultiplexer 105 selects the channel requested to be transmitted from the TS packets input from the descrambler 103. At, the video packet and the audio packet related to the program currently being broadcast and the data broadcast packet are extracted and output to the I / F unit 123.

When the I / F unit 123 receives a recording instruction from the control unit 125, the I / F unit 123 outputs a control command to the I / F unit 201 of the recording apparatus 200 to start recording,
The I / F unit 201 waits for a return command indicating that recording is possible.

Then, when the I / F unit 201 receives a return command indicating that recording is possible, the I / F unit 123 receives the TS packets of the video data, audio data, and data broadcasting data input from the demultiplexer 105. It is processed and converted into a format conforming to IEEE 1394, and output to the IF unit 201 of the recording device 200.

Next, the structure of the recording device 200 will be described.

In the recording device 200, the TS transmitted in the I / F unit 201 in the IEEE 1394 format.
The packet is received and output to the demultiplexer 203 and the recording / reproducing processing circuit 205.

The demultiplexer 203 operates slightly differently from the above-described demultiplexer 103. The demultiplexer 203 extracts only the data broadcasting TS packets from the TS packets forming the program, and outputs them to the recording / reproducing processing circuit 205.

In the recording / reproducing processing circuit 205, the I / F unit 2
The TS packet output from 01 is subjected to necessary processing for recording such as synchronization, addition of ID and the like, error correction coding, digital modulation, etc., and outputs the TS packet to the recording / reproducing circuit 207.

On the other hand, in the recording / reproducing processing circuit 205, the data broadcasting TS packet output from the demultiplexer 203 is subjected to processing such as synchronization, addition of ID, etc., error correction coding, digital modulation, etc., and recording / reproducing. Output to the circuit 207.

The recording / reproducing circuit 207 records the video, audio packet and data broadcast packet, which form one program, output from the recording / reproducing processing circuit 205 on a hard disk (not shown) and also demultiplexer 203.
The data broadcasting packet extracted by is recorded in the recording area for recording the data broadcasting packet on the hard disk.

Next, the reproducing operation of the recording device 200 will be described.

When the STB 100 receives a reproduction instruction from the operation section 127, the control section 125 instructs the I / F section 123 to start reproduction. When the I / F unit 123 receives the reproduction instruction, the I / F unit 123 sends a reproduction start control command to the I / F of the recording device 200.
Output to the / F unit 201. The I / F unit 201 receives the reproduction start command and outputs it to the recording / reproducing circuit 205.

The recording / reproducing processing circuit 205 receives the reproduction start instruction and controls the recording / reproducing circuit 207 to reproduce the video, audio and data broadcast packets recorded on the disc and the separately recorded data broadcast packet. To do.

The recording / reproducing processing circuit 205 performs processing such as demodulation and error correction on the normal video data, audio data and data broadcasting data which are output from the recording / reproducing circuit 207 and constitute one program. , To the I / F unit 201.

Further, the recording / reproducing processing circuit 205 performs processing such as demodulation and error correction on the data broadcast data recorded in an area different from the normal program data, and the I / F unit 2
Output to 01. As will be described later, the I / F unit 201 inserts a data broadcasting TS packet into a gap between TS packets forming a normal program and generates a data string for transmission to the recording device 100. Then, the I / F unit 201 converts this data string for transmission into the IEEE1394 format, and the I / F of the recording device 100 via the transmission line L.
To 123.

The I / F 123 of the STB 100 is the recording device 2
When the data string reproduced from 00 is received, it is output to the demultiplexer 105. The control unit 125 controls the demultiplexer 105 according to the reproduction instruction, and the I / F 123
The video data D1, the audio data D2, and the data broadcast data D3 are selected from the output data string and output to each decoder. The subsequent processing is the same as the operation during normal reception.

Next, the operation of the I / F unit 201 of the recording apparatus 200 for inserting the TS packets for data broadcasting into the gaps between the TS packets constituting a normal program will be described with reference to FIG.

FIG. 2A shows a normal transmission state of a data string transmitted from the I / F unit 201. In the figure, V indicates a video TS packet, A indicates an audio TS packet, D indicates a data broadcast TS packet, and N indicates NU.
An LL packet is shown. The NULL packet is MPEG2.
It is an empty packet that adjusts the transmission rate, as described in H222, which is the transmission standard of.

Usually, the data rate of one program transmitted by digital broadcasting is several Mbps to several tens of Mbps,
The data rate that can be recorded by the recording apparatus 200 of the present embodiment is several times this. On the other hand, the transmission rate of IEEE 1394 is at least 100 Mbps, which is considerably larger than the data rate of one program. Therefore, the STB is reproduced by the recording device 200.
In the data string transmitted from the I / F unit 201 for 100, a vacant time occurs as shown in (a) of FIG.

As can be seen from FIG. 2A, the number of data broadcast packets is very small compared to the number of video and audio packets in one program. Therefore, in the present embodiment, as shown in FIG.
The TS packet of the data broadcast reproduced separately from the data broadcast area of the hard disk is repeatedly inserted in the idle time of transmission.

Specifically, the I / F unit 201 has a memory for storing the reproduced data therein, and the I / F unit 201 stores a predetermined number of TS packets (1 TS packet is 188 bytes) of normal program data according to the available time. TS packets of a certain number of data broadcasts are repeatedly inserted. The TS packet of the normal program reproduced while the TS packet of the data broadcast is inserted is stored in the memory, read out at a predetermined timing and transmitted.

In FIG. 2B, 301 and 302 are I /
It is a TS packet of the data broadcast inserted by the F unit 201 in the idle time of transmission.

In this way, by repeatedly inserting a large number of TS packets of a data broadcast in the idle time and transmitting them to the STB 100, the STB 100 can obtain the data broadcast data immediately after the reproduction is started, and the user can instruct the display of the data broadcast. Even if there is, it is possible to quickly display the data broadcast screen.

In addition, in FIG. 2C, in addition to the free time,
It is the figure which showed the data string at the time of inserting TS packet 303, 304, 305 of data broadcasting instead of the NULL packet.

Also in this case, similarly, the data broadcast data can be obtained immediately after the reproduction is started. The data broadcast packet may be inserted only in the free time, or NUL
It may be inserted in place of the L packet, or may be inserted in both the idle time and the NULL packet.

In the present embodiment, the recording / reproducing circuit 207 records the data of the normal program and the data of the data broadcast on the hard disk, but not limited to this, a disk medium such as a magneto-optical disk or a memory card. It is of course possible to record in. Also in this case, a recording area for data broadcasting is provided on each recording medium, and the data broadcasting data is separately recorded. It is also possible to record the data of the normal program on a disc and the data broadcasting data on another medium such as a memory card.

[0051]

As described above, according to the present invention,
Data broadcasting data can be displayed quickly.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a recording system to which the present invention is applied.

FIG. 2 is a diagram showing a state of transmission data according to the embodiment of the present invention.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Noriyuki Ashigahara             Kyano, 3-30-2 Shimomaruko, Ota-ku, Tokyo             Within the corporation F-term (reference) 5C025 BA27 BA30 DA01 DA04 DA05                       DA10                 5C052 AA01 AB04 DD04 DD10                 5C063 AA20 AB03 AB11 AC01 AC05                       AC10 CA40

Claims (12)

[Claims] 1. Input means for inputting a digital signal sequence of a designated channel in a television broadcast signal received by a receiving means, and broadcasting from the inputted digital signal sequence on the designated channel. Recording means for extracting data of the data broadcast relating to the selected program, and recording the information data of the program of the specified channel and the extracted data of the data broadcast in a storage medium; and the information data from the storage medium. And reproducing means for reproducing the data broadcasting data, and multiplexing means for multiplexing the data broadcasting data and the information data reproduced by the reproducing means at a predetermined timing to generate a multiplexed data string and outputting the multiplexed data string. Recording device. 2. The recording means records the information data of the program in a first storage section, and records the extracted data broadcast data in a second storage section.
The recording device described. 3. The recording apparatus according to claim 2, wherein the first storage unit and the second storage unit are different storage areas on one storage medium. 4. The first storage unit and the second storage unit are storage media different from each other.
The recording device described. 5. The information data of the program includes video data, audio data and data broadcast data, and the recording means records the video data, audio data and data broadcast data of the program in the first storage section. The recording device according to claim 4, wherein the extracted data broadcast data is recorded in the second storage unit. 6. The recording apparatus according to claim 2, wherein the storage medium is a randomly accessible medium. 7. The digital signal train has a plurality of packets each consisting of a predetermined number of digital signals, and the multiplexing means multiplexes the information data and the data broadcast data in units of the packets. The recording device according to claim 1. 8. The recording apparatus according to claim 7, wherein the multiplexing means multiplexes the packets of the data broadcast data for each predetermined number of packets of the information data. 9. The multiplexing device according to claim 7, wherein the multiplexing means inserts the packet of the data broadcast data instead of the invalid packet to be transmitted together with the packet of the information data, to generate the multiplexed data string. Recording device. 10. The recording apparatus according to claim 1, wherein the multiplexing means outputs the multiplexed data string to an external device having a decoder for the data broadcast data. 11. The recording apparatus according to claim 1, wherein the multiplexing means is capable of transmitting a signal at a rate higher than the data rate of the information data. 12. Receiving means for receiving a television signal having a plurality of channels, and video data, audio data and data broadcasting of a program broadcast on a channel designated by the television signal received by the receiving means. Detecting means for detecting information data including data, data processing means for processing the video data, audio data and data broadcasting data of the program output from the detecting means, video data, audio data and data broadcasting of the program The first that can transmit a digital signal string consisting of data to the outside of the device
A receiving device including the interface means, second interface means for inputting the digital signal sequence output from the first interface, and data broadcasting data based on the digital signal sequence output from the second interface. Recording means for extracting the information data of the program and the extracted data broadcasting data in a storage medium, and a reproducing means for reproducing the information data and the data broadcasting data from the storage medium. A recording device, wherein the second interface unit further multiplexes the data broadcast data and the information data reproduced by the reproducing unit at a predetermined timing to generate a multiplex data string in the reproducing mode, It outputs to the first interface means and at the same time outputs to the first interface. The receiving means outputs the multiplexed data sequence to the detecting means in the reproduction mode, and the detecting means detects video data, audio data and data broadcasting data in the multiplexed data sequence from the first interface means. A recording system for outputting the data to the data processing means.