JP2000341664A - Device and method for transmitting and receiving data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily transmit/receive the data of a newspaper or the like at low cost by transmitting a data packet, which contains first data and retrieval data, after the transmission of a related information packet, which contains the broadcasting start time of the first data, setting the received broadcasting start time as the reception time of the first data and recording the first data and the retrieval data on a recording medium. SOLUTION: In a newspaper office, a space data base containing articles stored in a large-sized computer 1 and layout is edited by a work station 2 and a reduced picture, with which only headlines are visible while keeping the layout as it is, is prepared. The newspaper office relates the headlines and detailed articles and transmits them from a broadcasting center 3 while scrambling them and this is descrambled and received through a satellite 4 with an outdoor device 5 and a data receiver 6 by a recipient. The recipient selects any article out of the headlines of the reduced picture on a TV 10 while using a portable terminal 9 and records it on an MD 8 with a viewing or recording device 7. Thus, the data of the newspaper or the like can be transmitted/ received at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmitting apparatus and method, and a data receiving apparatus and method. For example, a text (character) which is delivered and sold daily or regularly, such as newspapers, magazines, and books, is disclosed. The present invention relates to a data transmission device and method, and a data reception device and method suitable for electronically distributing central information using a satellite.

[0002]

2. Description of the Related Art Information such as newspapers, magazines, and books is often distributed in a state of being printed on paper. In recent years, with the advance of data communication technology using a public telephone network, it has become possible to distribute such information by electronic means. For example, an online service for accessing a database such as a newspaper via a public telephone network using a personal computer and searching for necessary information is widely used.

Further, a service in which a contract is made with a service center in advance and the desired article information of a newspaper or magazine is distributed by facsimile has already been put to practical use.

[0004]

However, the distribution of information by paper has the following problems. (1) When reading a single newspaper or a magazine, this is not so much, but when reading a plurality of newspapers or magazines, the volume is very large and inconvenient. (2) When subscribing to newspapers at home, it is inconvenient because even a large number of family members can read only one person at a time. (3) Since a large amount of paper is consumed, the consumption of wood and pulp increases. (4) It is necessary to secure a delivery member for transportation and delivery, which increases transportation costs. (5) Since automobiles and motorcycles are used for transportation and delivery and generate waste gas, there is a risk of environmental destruction.

[0005] In addition, distribution of information by an electronic method is as follows.
The access fee for accessing the database of the center is high, and the communication cost is also required. Therefore, the cost is very high and cannot be easily used by ordinary people.

[0006] Furthermore, the method of transmission using a fax requires a labor-intensive operation of selecting desired article information for each contractor at a service center, so that the information fee is also very high. It was not easy for the general public to use.

The present invention has been made in view of such a situation, and is to provide information at a lower cost.

[0008]

According to the present invention, there is provided a data transmitting apparatus for retrieving first data including at least index data and a pointer for accessing the first data; A scrambler for scrambling the data, a data packet generator for packetizing the first data and the search data scrambled by the scrambler to generate a data packet, and a broadcast start time including a broadcast start time of the first data. A related information packet generating unit that packetizes related information related to one data to generate a related information packet, and a transmitting unit that transmits the related information packet and then transmits the data packet.

[0009] A data transmission method according to the present invention provides a scramble for scrambling first data and search data for searching for first data including at least index data and a pointer for accessing the first data. Step, a data packet generating step of packetizing the first data and the search data scrambled by the processing of the scramble step to generate a data packet, and a first data including a broadcast start time of the first data. It is characterized by including a related information packet generating step of packetizing related related information to generate a related information packet, and a transmitting step of transmitting a data packet after transmitting the related information packet.

[0010] The data receiving apparatus of the present invention includes a first packet including first data, search data for searching for the first data, and a second packet including a broadcast start time of the first data. Receiving means for receiving a packet and control means for controlling reception by the receiving means at a set time;
Setting means for setting the broadcast start time of the first data received by the receiving means in the control means; and recording means for recording the first data and the search data received by the receiving means on a recording medium. It is characterized by.

[0011] In the data receiving method of the present invention, a first packet including first data, search data for searching for the first data, and a second packet including a broadcast start time of the first data. A reception step of receiving a packet; a control step of controlling reception by the processing of the reception step at a set time; and a broadcast start time of the first data received by the processing of the reception step. And a recording step of recording the first data and the search data received by the processing of the receiving step on a recording medium.

In the data transmission apparatus and method having the above-described configuration, the data packet including the first data and the search data is transmitted after the related information packet including the broadcast start time of the first data is transmitted.

[0013] In the data receiving apparatus and method having the above configuration, the received broadcast start time is set as the reception time of the first data. The received first data and search data are recorded on a recording medium.

[0014]

FIG. 1 shows an example of a configuration of a data broadcasting system to which the present invention is applied. A newspaper company as an information provider has a large computer 1. The large computer 1 stores a paper space database. This space database includes article information for printing on newspapers, layout information, and the like. The data in this database is transmitted to the workstation 2 as needed, where it is edited.

That is, for each page (genre), the article data is edited in a form that is most easily searched on the receiving side. For example, by this editing, a search screen is created in which the page is reduced as it is so that only the headline is visible while the layout is not changed. Furthermore, from the headline, a search screen (headline) is associated with an article describing its details so that an article corresponding to the headline can be displayed. In this way, the data edited in a form that can be easily searched on the receiving side is transmitted to the broadcasting center (broadcasting station) 3 via the terrestrial data line.

The broadcast center 3 has, for example, a transmission device as shown in FIG. That is, the data transmitted from the newspaper company includes newspaper data, a scramble key, common information,
The data includes a receiving device ID, contract contents, and the like. Newspaper data is the data scrambler 1
4 and are scrambled according to the pseudo-random sequence output by the PN (pseudonoise) generator 13 and output to the independent data channel multiplexing circuit 12. The pseudo-random sequence generated by the PN generator 13 is
This is set according to the scramble key supplied by the newspaper company.

In addition to the scramble key, the common information, the receiving device ID, and the contract content are supplied to an encryption circuit 11 and encrypted. The encrypted data is supplied to the independent data channel multiplexing circuit 12 as related information.

The independent data channel multiplexing circuit 12
The scrambled newspaper data supplied from the data scrambler 14 and the related information supplied from the encryption circuit 11 are multiplexed and output to the digital channel signal multiplexing circuit 15.

The above configuration constitutes an encoder 25 for generating data in an independent data channel described later with reference to FIG.

Digital channel signal multiplexing circuit 15
Also, an audio signal transmitted as a digital channel signal described later with reference to FIG. 3 (at least a part thereof is an audio signal accompanying a video signal described later).
Is entered. Digital channel signal multiplexing circuit 1
5 is an input audio signal (digital audio signal);
The data supplied from the encoder 25 is multiplexed,
This is supplied to the phase DPSK modulator 16.

The four-phase DPSK modulator 16 performs four-phase DPSK modulation on the input data and outputs the data to a video signal / digital channel signal multiplexing circuit 17. This video signal /
The digital channel signal multiplexing circuit 17 is also supplied with a video signal to be broadcast in the broadcast center 3. While the audio signal input to the digital channel signal multiplexing circuit 15 is a digital signal, the video signal input to the video signal / digital channel signal multiplexing circuit 17 is an analog signal.

The video signal / digital channel signal multiplexing circuit 17 frequency-multiplexes the input video signal and the signal supplied from the four-phase DPSK modulator 16 to generate an FM signal.
Output to the modulator 18. The FM modulator 18 FM-modulates a predetermined carrier with the input signal and outputs the result to the up-converter 19. The up-converter 19 converts the frequency of the input FM signal into a frequency on the order of gigahertz. FM output from up-converter 19
After the signal is power-amplified by the power amplifier 20, the signal is supplied to the transmission antenna 21, from which the signal is transmitted to the satellite (broadcast satellite or communication satellite) 4 (FIG. 1).

FIG. 3 shows a frequency spectrum of a signal input to the FM modulator 18. As shown in the figure, the video signal has a frequency band up to about 4.5 MHz, and the signal output from the 4-phase DPSK modulator 16 is a signal having a frequency of 5.727272 MHz as a subcarrier. ing. That is, the video signal and the four-phase DPSK signal are frequency-multiplexed and transmitted.

FIG. 4 shows a format (format in the A mode) of digital channel data modulated by four-phase DPSK. As shown in FIG.
One frame of data is composed of a total of 2048 bits of data of 4 bits and 32 bits vertically. A frame synchronization signal, a control signal, and a range bit signal are recorded in the first range of 2 bits × 32 bits.

Since the data of one frame is transmitted in a time of 1 ms, the transmission rate is 2.048 Mbps.

The frame synchronization signal is a signal for synchronizing each frame. The control signal has 16 bits as one unit, and as shown in Table 1, the first one bit indicates which mode is the A mode or the B mode. The B mode will be described later. The next second and third bits indicate whether the television audio signal (audio signal accompanying the video signal) is a stereo signal, a monaural one-channel signal, or a monaural two-channel signal. It has been made like that.

The fourth and fifth bits indicate whether the additional signal other than the television sound is a stereo sound signal, a monaural one-channel sound signal, or a monaural two-channel sound signal. Or a signal other than voice.
The sixth to fifteenth bits are extended bits for future use. The 16th bit is a code indicating whether or not the audio output is suppressed.

[0028]

[Table 1]

Table 2 shows the first to fifth bits and the first bit.
It represents more detailed contents of 6 bits. That is, when the first bit is 0, it indicates that the mode is A, and 1
Indicates that the mode is B. When the second bit is 0 and the third bit is also 0, the television audio signal is stereo. When the second bit is 0 and the third bit is 1, the television audio signal is stereo. This indicates that the signal is a monaural two-channel signal (recorded in audios 1 and 2 in the format of FIG. 4). When the second bit is 1 and the third bit is 0, it indicates that the television audio signal is a monaural one-channel signal (recorded in audio 1). The state where both the second bit and the third bit are 1 is not particularly used.

When the fourth bit is 0 and the fifth bit is also 0, it indicates that the additional sound is stereo. When the fourth bit is 0 and the fifth bit is 1, the additional sound is stereo. This indicates that the sound is a monaural 2-channel signal (recorded in sounds 3 and 4). Further, when the fourth bit is 1 and the fifth bit is 0, it indicates that the additional audio is a monaural one-channel signal (recorded in audio 3). When the fourth bit and the fifth bit are both 1, it indicates that the signal to be transmitted is a signal other than voice.

The 16th bit is set to 1 when the audio output is suppressed, and set to 0 when the suppression is released.

[0032]

[Table 2]

As shown in FIG. 4, in the next 10 × 32-bit range after the first 2 × 32-bit range, and in the subsequent three ranges of 10 × 32, audio data of audio 1 to audio 4 are respectively stored. Is recorded. 1
In each range of 0 × 32 bits, audio data is arranged for 32 samples. That is, the number of bits per sample is 1
It is set to 0 bit. However, the analog audio signal is converted to digital data of 14 bits per sample. Of these, the upper 10 bits of the significant digit are selected and transmitted as data of one sample. That is,
As shown in FIG. 5, since the upper 10 bits of the significant digit of the 14 bits are selected, there are five selection ranges. The range bits recorded in the first 2 × 32 bit range indicate which range of the five ranges is 10 bits.

In the A mode, one channel of audio data is arranged in this 10 × 32 bit range. In the B mode, however, 20 × 3 bits are arranged.
The audio data for one channel is arranged in a 2-bit range. That is, in the B mode, higher-quality audio data can be transmitted.

After the audio 4 data, independent data channel data is arranged in a range of 15 × 32 bits, and in the last 7 × 32 bits, a horizontal error correction code (C1) is arranged. Is arranged.

The data of the independent data channel shown in FIG. 4 is transmitted in packet units. FIG. 6 shows the format of this packet. As shown in the drawing, one packet is composed of 288 bits, the first 16 bits are used as a header, and the subsequent 19 bits are used.
Substantial data is arranged in 0 bits, and the error correction code (C1) of the packet is arranged in the last 82 bits.
Of the 16-bit header, the first 5 bits are used as a service identification code, and the remaining 11 bits are used as a horizontal error correction code (check bit) (C1) of the service identification code.
It is said. The service identification code includes a code for identifying the related information and the newspaper data, as described later with reference to FIG.

As the service identification code of the header 16,
Since five bits are prepared, it is possible to logically identify 32 types of services. However,
As shown in FIG. 7, when each of the five bits is 0, it is an identification code when there is no data to be transmitted as a dummy packet. Therefore, in practice, 31 types of services can be identified by the remaining 31 types of identification codes.

The data for one frame shown in FIG. 4 is collected for nine frames as shown in FIG. 8, thereby forming a super frame. The bit string of one packet is
It consists of one superframe of data.

As shown in the figure, data is sequentially transmitted in the vertical direction in each frame. Therefore, the burst error occurs in the vertical direction in FIG. Therefore, in order to strengthen against this burst error, independent data channels in a range of 15 × 32 bits are multiplexed diagonally. As shown in FIG. 8, since the length of the independent data channel in the horizontal direction is 15 bits, there are 15 different diagonal directions. The packet consisting of 288 bits shown in FIG. 6 corresponds to each direction. Therefore, the independent data channel
Packets at 15 positions (packets of 15 channels) exist. As described above, by performing multiplexing in the oblique direction, it is possible to interleave the data constituting each packet, and it is more resistant to burst errors.

FIG. 9 schematically shows the structure of a packet in an independent data channel. As shown in the figure, one of the 15 types of packets is assigned the related information output by the encryption circuit 11 shown in FIG. For example, newspaper data (newspaper data output from the data scrambler 14) of each of the newspaper companies A to I can be allocated to the remaining 14 packets. However, a single newspaper company can use a plurality of packets simultaneously. In the embodiment shown in FIG. 9, one packet is used as related information, and newspaper article data of newspaper companies A, B, and C is
Two packets are assigned to each.

FIG. 10 schematically shows data for each of the 15 packet positions. As shown in the figure, in this embodiment, related information is assigned to the first packet, and data of newspapers A to I are assigned to the second to fifteenth packets, respectively. I have. That is, the related information and the newspaper data A to I are simultaneously transmitted to each home.

FIG. 11 shows a more detailed format of the packet. As shown in the drawing, the first 16 bits of a 288-bit packet are used as a header, in which identification information such as related information and newspaper data (service identification data in FIG. 6) is arranged. Related information or newspaper data is arranged in 190 bits following the header, and an error correction code is arranged in the last 82 bits.

There are two types of related information: common information and individual information. At the beginning of the common information, is it common information,
A type identification code for identifying whether the information is individual information is assigned. Then, newspapers A, B, C, ...
A newspaper data identifier for identifying which newspaper data is assigned is assigned. Further, at the subsequent position, data of the packet position to be used is arranged. That is, a code indicating which of the above-described positions 1 to 15 the packet data is assigned to.

Next, a scramble key is assigned. This scramble key is received by the data receiving device 6 described later, and the data scrambled by the data scrambler 14 of FIG.
Descramble becomes possible.

After the scramble key, a broadcast start time and a broadcast end time are further assigned. After the broadcast end time, other necessary codes can be assigned.

On the other hand, a type identification code is assigned to the head of the individual information, followed by a receiving device ID. This receiving device ID is assigned to, for example, each data receiving device 6 of FIG. 1 arranged in each home. Subsequent to the receiving device ID, the contract content of the contractor having the receiving device ID is assigned. Hereinafter, the receiving device ID and the contract content corresponding to the receiving device ID are sequentially assigned.

As shown in FIG. 10, since the related information assigned to the first packet is always transmitted, the receiving side monitors the related information to obtain the scramble key of a predetermined newspaper company. , The broadcast start time and the broadcast end time can be detected. If the data receiving device having the receiving device ID included in the individually transmitted information as appropriate during the predetermined period in which the common information is not transmitted matches the contract, the newspaper data of the predetermined newspaper company is downloaded. It is possible to do.

On the other hand, newspaper data is divided into search page data and article page data. A start code is assigned to the data on the search page first (search page a). This start code is, for example, newspaper A
Of newspaper data starts from here. After the start code, a newspaper data identifier is arranged. This newspaper data identifier corresponds to newspaper company A,
.. Is a code for identifying which of B, C,. Following the newspaper data identifier, a type identification code for identifying the search page and the article page is assigned. And then,
Paper identification data is assigned. The page identification data identifies a page (genre) such as, for example, political, economic, or sports.

Next to the page identification data, a headline is arranged, followed by the character size and font of the headline and its position data.
Next to the position data, layout data indicating whether the headline sentence is written vertically or horizontally is arranged. Then, next to that, a pointer for accessing a position where a detailed article corresponding to the headline sentence is described is arranged.

The above search page a is the format of the first packet, but the second and subsequent packets may have the format shown in the search page b. That is, in this packet, the start code and the newspaper data identifier are omitted.

On the other hand, the article page of the newspaper data has the type identification data arranged at the head thereof, followed by the layout (article page a). Following the layout is an overview, followed by article data representing the details of the article. When the outline or the article data is long and cannot be accommodated in one packet, the packet shown in the article page b is added as necessary after the article page a described above. Then, an end code is added to the end position of the article data.

FIG. 12 schematically shows a search page and an article page. The search space is, as shown in FIG.
It is displayed so that only the heading is visible. On the contrary,
The article page is displayed so that not only the headline but also an outline and more detailed articles can be viewed following the headline, as shown in FIG. When the contractor selects a predetermined heading on the search paper by clicking it, for example, with a mouse or the like as necessary, an outline and an article corresponding to the heading are displayed as shown in FIG. It has been made.

FIG. 13 shows the overall arrangement of each packet on the search page and article page. As shown in the figure, a search page packet is arranged before an article page packet, and each search page packet has a pointer for enabling access to the corresponding article page. Are located.

The data as described above is transmitted from the broadcasting center 3 in FIG. 1 to the satellite 4 and further transmitted from the satellite 4 to, for example, a receiver (contractor) in each home. In each home, the signal received by the outdoor device 5
The signal is converted into a predetermined intermediate frequency signal (IF signal). This I
The F signal is input to the data receiving device 6. The data received by the data receiving device 6 is demodulated there, supplied to the recording device 7, and recorded on a recording medium such as a mini disk (trademark) 8. The user mounts the mini disc 8 on, for example, a portable terminal 9 and
The received data can be searched from a search page, and a necessary article page can be displayed. Alternatively, the recording device 7
Can be read out, output to the television receiver 10 as needed, and displayed.

FIG. 14 shows a configuration example of the data receiving device 6. As shown in the figure, the IF signal input from the outdoor unit 5 is supplied to the BS tuner 32. The user sets the broadcast time of the contracted newspaper data in the timer circuit 34 in advance. The timer circuit 34 has a built-in clock, and when the set time comes, C
A signal is output to a processing circuit 35 including a PU, a ROM, a RAM, and the like.

When the signal is output from the timer circuit 34, the processing circuit 35 outputs the power on / off control circuit 3
6 to turn on the power supply circuit 37. This allows
Power is supplied to each unit from the power supply circuit 37, and the data receiving device 6 enters an operable state.

At this time, the processing circuit 35 transmits the signal to the BS tuner 32 via the BS tuner control circuit 31.
To select the channel on which the data of the contracted newspaper company is transmitted. The BS tuner 32 receives the input I
The signal of the designated channel is decoded from the F signal, and is output to the decoder 33. The decoder 33 decodes the data at the packet position including the contracted newspaper data. The processing circuit 35 supplies the data decoded by the decoder 33 to the recording medium 42 via the recording medium driving circuit 41 of the recording device 7 and records the data. This recording medium 42
For example, it is constituted by a hard disk. Alternatively, the processing circuit 35 records the output of the decoder 33 via the recording medium driving circuit 43 on a recording medium constituted by, for example, the mini disk 8.

When a predetermined command is input, the processing circuit 35 reproduces the data recorded on the recording medium 42 or the mini-disc 8, supplies the data to the video circuit 38, and converts it into a video signal. The signal output from the video circuit 38 is output to the television receiver 10 and displayed.
Alternatively, as described with reference to FIG. 1, the newspaper article can be viewed on the portable terminal 9 by mounting the mini-disc 8 on which the newspaper data is recorded to the portable terminal 9.

In this case, as described with reference to FIG. 12, since the newspaper data is composed of a search page and an article page, the search page (FIG. 12 (a)) is displayed first, and the heading is displayed. By looking at and selecting a required heading, the corresponding article page (FIG. 12B) can be displayed. Therefore, even if the display unit of the portable terminal 9 or the television receiver 10 is small, information can be efficiently displayed, and a desired one can be quickly selected and displayed.

The timer circuit 34 outputs a signal to the processing circuit 35 when a preset predetermined broadcast end time has arrived. At this time, the processing circuit 35 controls the power supply circuit 37 via the power on / off control circuit 36 to stop the power supply to each unit. Thus, the download of the newspaper data is completed.

If the user receives another channel during the broadcast time of the contracted newspaper data, the processing circuit 3
5 causes the television receiver 10 to display a message prompting a channel change via the video circuit 38. Alternatively, an alarm sound is generated. Furthermore, it is also possible to forcibly and automatically change the receiving channel.

In the above description, the user is caused to set the time at which the data receiving device 6 operates. However, when the power is on, the broadcasting of the individual newspaper data included in the related information is started. If the broadcast time of the contracted newspaper data is automatically set in advance in the timer circuit using the time and the broadcast end time, the data can be set without the user having to set the time at which the data receiving device 6 operates. Even when the power of the receiving device 6 is turned off, it is possible to automatically receive the contracted newspaper data.

FIG. 15 shows the BS tuner 32 and the decoder 3
3 shows a more detailed configuration example. The IF signal input from the outdoor unit 5 is transmitted to the FM demodulator 7 of the BS tuner 32.
1 is input. The FM tuner 71 receives a BS tuner control signal from the BS tuner control circuit 31. The FM demodulator 71 demodulates the IF signal of the channel corresponding to the BS tuner control signal into a baseband signal, and outputs it to the video signal / digital channel signal separation circuit 72. The video signal / digital channel signal separation circuit 72 separates the video signal and the digital channel signal from the input signal, and outputs the video signal to, for example, the television receiver 10 for display.

On the other hand, the digital channel signal separated by the video signal / digital channel signal separation circuit 72 is input to a 4-phase DPSK demodulator 73 and demodulated. The signal output from the four-phase DPSK demodulator 73 is input to a digital channel signal separation circuit 74, where it is separated into an audio signal and an independent data channel signal. If the audio signal corresponds to the video signal described above, it is output to the television receiver 10.

On the other hand, the digital channel signal separation circuit 74 separates the independent data channel signal from the signal input from the 4-phase DPSK demodulator 73,
To the newspaper data / related information separation circuit 81. The newspaper data / related information separation circuit 81 separates newspaper data and related information from the input signal, outputs newspaper data to the data descrambler 87, and outputs related information to the decoding circuit 82. The memory 83 includes the decoder 33
Receiving device I assigned to (data receiving device 6)
D is stored in advance.

When the contents of the contract of the receiving device ID that matches the receiving device ID stored in the memory 83 are inputted as the related information, the decoding circuit 82 supplies the contents of the contract to the contract condition comparing circuit 84, It is stored in the built-in memory 84A. Further, the decoding circuit 82 decodes the scramble key transmitted as the related information (common information),
Output to the on / off switching circuit 85.

Then, when the data identifier is decoded from the input related information, the data identifier is supplied from the decoding circuit 82 to the contract condition comparing circuit 84.
The contract condition comparison circuit 84 converts the input data identifier into
The contract is compared with the contract contents already stored in the memory 84A. The contract contents include the data identifier of the newspaper which has been contracted in advance. The contract condition comparing circuit 84 determines whether the data identifier stored in the memory 84A matches the data identifier supplied from the decoding circuit 82 unless the contract fee is not paid and other prohibited conditions are not included in the contract contents. , And outputs a control signal for switching the on / off switching circuit 85 to the on state. Thus, the scramble key output from the decoding circuit 82 is supplied to the PN generator 86 via the on / off switching circuit 85.

The PN generator 86 generates a pseudo random sequence corresponding to the input scramble key. The data descrambler 87 descrambles the newspaper data supplied from the newspaper data / related information separation circuit 81 using the pseudo random sequence supplied from the PN generator 86. Then, the descrambled newspaper data is supplied to the recording device 7 and recorded on the recording medium 42 as the mini disk 8 or the hard disk as described above.

Although the present invention has been described with reference to the case of transmitting newspaper data as an example, the present invention can be applied to the transmission of magazines, books, and other character data. Furthermore, it is also possible to simultaneously transmit image data and audio data in addition to character data.

[0070]

As described above, according to the data transmitting apparatus and method having the above-described configuration, a data packet including first data and search data is transmitted to a related information packet including a broadcast start time of the first data. Later, it was sent.

Further, according to the data receiving apparatus and method having the above configuration, the received broadcast start time is set as the reception time of the first data, and the received first data and search data are recorded on the recording medium. I did it.

Therefore, the user does not need to access the transmitting side, and it is possible to transmit or receive data such as newspapers, magazines, and books easily and at low cost.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating a configuration example of a broadcast center 3 in FIG. 1;

FIG. 3 is a diagram illustrating a spectrum of data input to the FM modulator 18 of FIG. 2;

FIG. 4 is a digital channel signal multiplexing circuit 1 of FIG.
FIG. 5 is a diagram illustrating a format of digital channel data in FIG.

FIG. 5 is a diagram illustrating range bits in the format of FIG. 4;

FIG. 6 is a diagram illustrating a format of a packet of an independent data channel.

FIG. 7 is a diagram for explaining the function of the header in FIG. 6;

FIG. 8 is a diagram illustrating a diagonal multiplexing method in an independent data channel.

FIG. 9 is a diagram illustrating data recorded in a packet of the independent data channel in FIG. 8;

FIG. 10 is a diagram for explaining positions of packets constituting an independent data channel.

FIG. 11 is a diagram illustrating a detailed format of a packet.

FIG. 12 is a diagram illustrating a search page and an article page.

FIG. 13 is a diagram illustrating a relationship between a search page and an article page.

14 is a block diagram illustrating a configuration example of a data receiving device 6 in FIG.

15 is a block diagram showing a more detailed configuration of a BS tuner 32 and a decoder 33 of FIG.

[Explanation of symbols]

1 large computer, 2 workstation, 3 broadcasting center, 4 satellite, 5 outdoor unit, 6 data receiving device, 7 recording device, 8 mini disk, 9
Portable terminal, 10 television receiver

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Claims (4)

[Claims] 1. search data for searching for the first data, which includes at least index data and a pointer for accessing the first data; scramble means for scrambling the first data; A data packet generating means for packetizing the first data and the search data scrambled by the scramble means to generate a data packet; and a data packet generating means which includes a broadcast start time of the first data. A data transmission device comprising: a related information packet generating unit that packetizes related information to generate a related information packet; and a transmitting unit that transmits the data packet after transmitting the related information packet. 2. a search data for searching the first data including at least index data and a pointer for accessing the first data; and a scrambling step of scrambling the first data; A data packet generation step of packetizing the first data and the search data scrambled by the processing of the scramble step to generate a data packet; and the first data including a broadcast start time of the first data. A related information packet generating step of generating related information packets by packetizing related information related to the above, and a transmitting step of transmitting the data packet after transmitting the related information packet. . 3. Receiving a first packet including first data, search data for searching for the first data, and a second packet including a broadcast start time of the first data. A receiving unit that controls reception by the receiving unit at a set time; a setting unit that sets a broadcast start time of the first data received by the receiving unit in the control unit; A data receiving apparatus comprising: a recording unit that records the first data and the search data received by a receiving unit on a recording medium. 4. Receiving a first packet including first data, search data for searching for the first data, and a second packet including a broadcast start time of the first data. A receiving step, a control step of controlling reception by the processing of the receiving step at a set time, and a broadcast start time of the first data received by the processing of the receiving step as a time in the processing of the control step. And a recording step of recording the first data and the search data received by the processing of the receiving step on a recording medium.