JPH1168718A - Digital broadcast receiving system, its transmitting device and receiving device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a practical digital broadcasting home listening technique for receiving digital broadcasting on a plurality of monitors at home. A parent receiving apparatus includes an input switching unit for switching one or more digital multiplexed streams, a separating unit for separating video, audio, and information data, and a data for transmitting the separated video / audio data. Digital data distribution means 113, 205 comprising a transmission means, a control signal input means for inputting in response to a user request, and a control means for controlling the input switching means and the separation means, and comprising a separation means and a data transmission means. And at least one child receiving device 1
20 is a data receiving means 12 for receiving video / audio data
2, a video / audio decoding unit 124 for decoding, a signal output unit for outputting a decoded video / audio signal, and a control signal output unit according to a user's request.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital broadcast signal receiving system, and more particularly, to a digital broadcast receiving system comprising a parent receiving device and one or more child receiving devices, enabling digital broadcasting to be shared in a home. About.

[0002]

2. Description of the Related Art Conventionally, television broadcasting has been limited to analog broadcasting. In Japan, digital broadcasting, which transmits a digitalized broadcasting signal such as a video signal or an audio signal to a home, has begun.

[0003] In digital broadcasting, multi-channels have been obtained by techniques such as high-efficiency compression coding of moving images, but at the same time, along with digitized video and audio signals,
By transmitting additional information, services such as an electronic program guide (EPG: Electronic Program Guide) have become possible.

FIG. 6 shows an example of a digital broadcast receiving apparatus. 601 is a signal input terminal for digital broadcasting, 602 is a tuner for channel selection and a demodulation circuit for digital demodulation, 603 is an error correction circuit, 604 is a descrambler for decrypting, 605 is data required from a digital multiplex stream. 606 is an audio signal decoding circuit, 607 is an audio signal output terminal, 608 is a video signal decoding circuit, 611 is a menu or a program table superimposed on the video signal and output An on-screen display circuit 609, a mixing circuit for superimposing the signals from the video decoding circuit 608 and the on-screen display circuit 611, an output terminal 610 for outputting an image to a monitor such as a television, and a display unit 612 for separating the data. A control circuit for controlling the circuit 605 and the like and analyzing the acquired data; 61 Remote control signal reception terminal for receiving the setting of the user, 614 is an IC card for managing contract information of the user.

[0005] In the digital broadcast receiving apparatus shown in FIG. 6, the IC card 614 generates a key for canceling the information management and descrambling of the user, and the descrambler 604.
The scramble of the video / audio data is released by setting the key. Further, the data separation circuit 605
On the basis of the program information obtained from the above, an on-screen display (hereinafter referred to as OSD) display screen such as a program guide is created, and can be superimposed on the video signal from the video compression circuit 608 and output to a television or the like. .

[0006]

The above-described example is excellent when a single digital broadcast receiving device is used at home as a digital broadcast receiving device and the digital broadcast receiving device is viewed on a single monitor.

However, when receiving a digital broadcast on a plurality of monitors at home, in the above-described example, a digital broadcast receiver must be prepared according to the number of monitors. Also, since the contract information is managed by the IC card 614, it is necessary to make a contract for the program to be received for each receiving device. Occur.

Therefore, with the above-described digital broadcast receiving apparatus, it is uneconomical and practically difficult to receive digital broadcasts on a plurality of monitors at home.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a digital broadcast system which is economically efficient in terms of contract and installation of a receiving device when receiving digital broadcasts on a plurality of monitors at home. Another object of the present invention is to provide a digital home broadcasting technology for digital broadcasting.

[0010]

In order to achieve the above object, the present invention provides an input switching means for inputting and switching at least one or more digital multiplexed streams, and a single output signal from the input switching means. Separating means for separating the video, audio and information data from one digital multiplexed stream, data transmitting means for transmitting the separated video and audio data, and a control signal for inputting a control signal according to a user request Digital data comprising input means, and control means for controlling the input switching means and the separation means in accordance with the control signal input from the control signal input means, and comprising the separation means and the data transmission means A parent receiving device having at least one or more distribution means;
Data receiving means for receiving the video / audio data transmitted from the data transmitting means, video / audio decoding means for decoding the video / audio data received by the data receiving means, and decoding the decoded video / audio signal There is provided a digital broadcast receiving system including a signal output unit that outputs a signal and a child receiving device that has a control signal output unit that outputs a control signal according to a user's request to the parent receiving device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG.

In this embodiment, one parent receiving device communicates with one child receiving device.

In FIG. 1, reference numeral 100 denotes a parent receiving device;
Reference numeral 1 denotes a digital broadcast signal input terminal; 102, a tuner for channel selection and a demodulation circuit for digital demodulation;
3 is an error correction circuit, 104 is a descrambler for decrypting, 105 is a data separation circuit for selecting necessary data from a digital multiplex stream and distributing it to each circuit, 1
06 is a scrambler for encrypting the separated digital data, 107 is a data transmission circuit for transmitting the output data of the scrambler 106, and 108 is a digital data output for outputting the output data of the data transmission circuit 107. Terminal 109, the parent receiving device 100
A control circuit for controlling contract information, and an IC for managing contract information
Card 111, a remote control signal input terminal for inputting a remote control signal, 112, a remote control signal receiving circuit for receiving the remote control signal input from the remote control signal input terminal 111, 113, a demodulation circuit 102, the error correction circuit 103, A digital data distribution circuit including a descrambler 104, the data separation circuit 105, the scrambler 106, and the data transmission circuit 107;
120 is a child receiving device, 121 is a digital data input terminal for inputting digital data transmitted from the parent receiving device 100, 122 is a data receiving circuit for receiving digital data transmitted from the parent receiving device 100, 1
23, a descrambler for decrypting the encryption performed by the scrambler 106; 124, a descrambler 123;
A video / audio decoding circuit for decoding a video / audio signal from an output signal of the video signal; a video signal output terminal for outputting a decoded video signal; an audio signal output terminal for outputting a decoded audio signal; , A remote control signal transmitting circuit for transmitting a remote control signal; and an output terminal for outputting an output signal of the remote control signal transmitting circuit.

In the parent receiving apparatus 100 shown in FIG. 1, the digital data separated by the data separating circuit 105 is encrypted by the scrambler 106 so as to be transmitted to the child receiving apparatus 120. Further, the data transmission circuit 1
At 07, for example, the data is converted into a format suitable for transmission and transmitted. In the child receiving device 120, the output signal of the parent receiving device 100 is received, and the data receiving circuit 1
22, the original format is restored from the format suitable for transmission, and the descrambler 123 cancels the encryption performed by the scrambler 106, and
An audio decoding circuit 124 decodes the video / audio data.
Further, the remote control signal receiving section 127 receives a remote control signal according to a user's request, and the remote control signal transmitted by the remote control signal transmitting circuit 128 receives the remote control signal.
By modulating and transmitting the signal to 0, and receiving the remote control signal by the remote control signal receiving circuit 112, the parent receiver 100 can receive a user request.

According to this embodiment, the data separation circuit 1
05, the user can extract the desired digital data, so that the amount of data to be transferred to the child receiving device can be reduced. Further, by scrambling the data locally between the parent receiving device and the child receiving device, the digital data transmission / reception can be performed. There is no problem in terms of copyright. Contractual I
Since the C card is inserted only in the parent receiving device 100, there is no need to transmit and receive contract information between the parent receiving device and the child receiving device, and a secure system can be realized in terms of personal information management.

A second embodiment of the present invention will be described with reference to FIG. In this embodiment, one parent receiving device communicates with two child receiving devices. FIG. 2 shows one parent receiver and one receiver in this embodiment.
FIG. 4 is a block diagram of one child receiving device, and although not shown, another child receiving device has the same configuration as the child receiving device shown in FIG. 2.

In FIG. 2, reference numeral 200 denotes a parent receiving device;
1, 202, and 203 are digital broadcast signal input terminals, 204 is an input switching circuit of the input terminals 201 to 203, 205 is the same as the digital data distribution circuit 113 described with reference to FIG. A digital data output terminal for outputting an output signal of the data distribution circuit 205, and the rest is the same as FIG.

In this embodiment, since the parent receiving apparatus 200 includes the input terminals 201 to 203, the input switching circuit 204, and the digital data distribution circuits 113 and 205, for example, two antennas are respectively connected to the input terminals. If the input terminal 201 is assigned to the digital data distribution circuit 113 and the input terminal 202 is assigned to the digital data distribution circuit 205 by the control circuit 109, the master receiving device 200 will have two independent terminals. Digital data can be transmitted according to the request of the receiving device.

Further, CS antennas fixed to different polarizations are connected to the input terminals 201 and 202, respectively, and the control circuit 109 converts the signals input to the input terminals 201 and 202 into digital data distribution circuits 113 and 20
By allocating to 4, the parent receiving device 200 can receive digital data according to independent requests of two child receiving devices without using an expensive block converter.

The input terminals 201 to 203 are connected to CS
In addition to the digital broadcasting antenna, it is possible to connect a cable for CATV digital broadcasting and an antenna for terrestrial digital broadcasting. Further, the digital data distribution circuits 113 and 205 are not only compatible with CS digital broadcasting, but also for CATV / terrestrial broadcasting. It can be adapted to digital wave broadcasting. Therefore, by controlling the input switching circuit 204 by the control circuit 109, the parent receiver 200 can receive CS, CATV, and terrestrial digital broadcasting, and the child receiver 120 does not need to be aware of broadcast media. Desired digital data can be received. Further, since the IC card 110 for managing the contract information of the user is inserted only into the parent receiving device 100, the contract information of the two child receiving devices can be centrally managed.

According to the present embodiment, in addition to the effects described in the first embodiment, digital data can be transmitted by the parent receiving apparatus in response to independent requests from two child receiving apparatuses. . Also, by preparing a digital data distribution circuit corresponding to the broadcast media, a single parent receiver can provide
It is possible to receive S / CATV / terrestrial digital broadcasting. In addition, only one parent receiving device has one I
Since the C card is managed and the received broadcast is descrambled according to the contract status, there is no need to pass the scramble key to the child receiving device. Further, since the parent receiving device manages the contract information of the two child receiving devices, it is possible to realize an economical system even in terms of contract, in which the same program is not redundantly contracted at home.

A third embodiment of the present invention will be described with reference to FIG. In this embodiment, one parent receiving device communicates with one child receiving device.

In FIG. 3, reference numeral 300 denotes a parent receiving apparatus;
A video / audio decoding circuit for decoding video / audio data output from the data separation circuit 105, an analog modulation circuit 302 for analog-modulating an output signal of the video / audio decoding circuit 301, and an analog signal 303 for outputting an analog signal An analog signal output terminal 304 is connected to the demodulation circuit 102, the error correction circuit 103, the descrambler 104, the data separation circuit 105, and the video / audio decoding circuit 30.
1 is an analog data distribution circuit composed of an analog modulation circuit 302; 310 is a slave receiver; 311 is an input terminal of an analog signal modulated by the analog modulation circuit 302; 313 is a video / audio reproduction circuit, 314 is a video signal output terminal for outputting a video signal reproduced by the video / audio reproduction circuit 314, and 316 is a video / audio reproduction circuit. An audio signal output terminal for outputting an audio signal reproduced by the circuit 314, and the other components are the same as those in FIG.

In the parent receiving apparatus 300, the video / audio data separated by the data separation circuit 105 is decoded in advance by the video / audio decoding circuit 301, and the decoded analog video / audio signal is converted by the analog modulation circuit. At 302,
For example, the signal is modulated into an RF band such as 2ch of NTSC broadcasting and output from the analog signal output terminal 303. In the slave receiver 310, the tuner 312 tunes to 2ch, and the analog demodulation circuit 313 and the video / audio reproduction circuit 314 demodulate and reproduce video / audio signals.
Therefore, the reproduction of the video / audio signal transmitted from the parent receiving device 300 can also be realized by preparing a television vision or the like. The notification of the user request to the parent receiving device can be realized by using the remote control signal transmitting circuit 128 and the remote control signal receiving circuit 112 shown in FIG.

According to the present embodiment, the parent receiver transmits the video / audio signal desired by the user as an analog signal to the child receiver, so that the received signal can be used as it is in a conventional television or the like as it is. Since it is possible to use an antenna line or the like distributed in a home at present, there is a cost advantage as a system for distributing digital broadcasting in a home. Further, since analog signals are transmitted and received between the parent receiving device and the child receiving device, there is no problem of copyright. Furthermore, since the IC card is inserted only in the parent receiving device, there is no need to transmit and receive contract information between the parent receiving device and the child receiving device, and a secure system can be realized in terms of personal information management.

A fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, one parent receiver communicates with two child receivers. FIG. 4 is a block diagram of one parent receiving device and one child receiving device in the present embodiment. Although not shown in the figure, another child receiving device is also shown in FIG. This is the same configuration as.

In FIG. 4, reference numeral 400 denotes a parent receiving device;
1, 202, and 203 are digital broadcast signal input terminals, 204 is an input switching circuit of the input terminals 201 to 203, and 401 is the same as the analog data distribution circuit 304 described with reference to FIG. An analog signal output terminal 402 outputs an output signal of the analog data distribution circuit 401. Otherwise, it is the same as FIG.

In the third embodiment, the analog distribution circuit 304 modulates the signal into 2 channels of NTSC broadcasting and outputs an analog signal.
By modulating the SC broadcast to 5 channels and outputting an analog signal, although not shown in FIG. 4, the child receiver connected to the analog signal output terminal 402 can receive a digital broadcast by tuning to 5 channels. .

According to the present embodiment, for the same reason as described in the second embodiment, in addition to the effects described in the third embodiment,
One parent receiver can transmit analog data in response to independent requests from two child receivers. Also, by preparing an analog data distribution circuit according to the broadcast media, one parent receiver can use CS / CATV.
-It is possible to receive terrestrial digital broadcasting.
Furthermore, since only one parent receiving device manages one IC card and cancels the scramble of the received broadcast according to the contract status, there is no need to pass the scramble key to the child receiving device. In addition, since the parent receiving device manages the contract information for two child receiving devices, the same program is not duplicated at home, and an economical system is realized in terms of contracts. it can.

A fifth embodiment of the present invention will be described with reference to FIG.

In this embodiment, one parent receiver communicates with two child receivers. FIG. 5 is a block diagram of one parent receiving device and one child receiving device in the present embodiment. Although not shown in the drawing, another child receiving device is also shown in FIG. This is the same configuration as.

In FIG. 5, reference numeral 501 denotes a mixer for mixing the output signal of the analog data distribution circuit 304 and the output signal of the analog data distribution circuit 401, and reference numeral 502 denotes an output terminal for outputting the output signal of the mixer 501. Otherwise, it is the same as FIG.

In the fourth embodiment, the analog distribution circuit 304 outputs an analog signal modulated into 2 channels of NTSC broadcasting, and the analog distribution circuit 401 outputs 5 channels.
Although it is assumed that the analog signal is output to the analog distribution circuit 3 in the mixer 501 in the present embodiment.
The output signal of the analog distribution circuit 401 and the output signal of the analog distribution circuit 401 are multiplexed on the frequency axis. According to the present embodiment, it is also possible to determine the frequency to be tuned in advance in each child receiving device, and in the parent receiving device, a video / audio signal reproduced in response to a request from each child receiving device is received by each child receiving device. It is possible to perform analog modulation on the frequency received by the device and multiplex each on the frequency axis. Therefore, the transmission path between the parent receiving device and each child receiving device requires only one system, and the antenna line or the like distributed in the home can be used. Can be realized.

In the second, fourth and fifth embodiments of the present invention, the number of the input terminals 201 to 203 is three.
Further, the number of input terminals can be increased, and the number of input terminals can be further increased in the digital data distribution circuit 113 and the analog data distribution circuit 304, so that expansion at home according to a user's request is possible.

[0036]

According to the present invention, when digital broadcasting is received on a plurality of monitors in a home, an economically efficient home listening system can be realized in terms of both contract and installation of a receiving device. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a fifth embodiment of the present invention.

FIG. 6 is a block diagram of a digital broadcast receiving device.

[Explanation of symbols]

Reference numeral 100: parent receiver, 101: input terminal of digital broadcast signal, 102: demodulation circuit, 103: error correction circuit, 1
04: descrambler, 105: data separation circuit, 10
6 ... Scrambler, 107 ... Data transmission circuit, 108 ...
Digital data output terminal, 109 ... control circuit, 110
... IC card, 111 ... Remote control signal receiving terminal, 112
... Remote control signal receiving circuit, 113 ... Digital data distribution circuit, 120 ... Child receiving device, 121 ... Digital data input terminal, 122 ... Data receiving circuit, 123 ... Descrambler, 124 ... Video / audio decoding circuit, 125 ... Video signal output Terminals: 126: audio signal output terminal, 127: remote control signal light receiving section, 128: remote control signal transmission circuit, 1
29: remote control signal output terminal, 200: parent receiving device, 2
01, 202, 203: Digital broadcast signal input terminal, 204: Input switching circuit, 205: Digital data distribution circuit, 206: Digital data output terminal, 300
… Parent receiving device, 301… video / audio decoding circuit, 302…
Analog modulation circuit, 303: analog signal output terminal, 3
04 ... analog data distribution circuit, 310 ... child receiving device,
311: analog signal input terminal, 312: tuner, 3
Reference Signs List 13 analog demodulation circuit, 314 video / audio reproduction circuit, 315 video signal output terminal, 316 audio signal output terminal, 400 parent receiver, 401 analog data distribution circuit, 402 analog signal output terminal, 500 Parent receiving device, 501: Mixer, 502: Analog signal output terminal, 601: Digital broadcast signal input terminal, 602 ...
Demodulation circuit, 603 error correction circuit, 604 descrambler, 605 data separation circuit, 606 audio decoding circuit, 607 audio output terminal, 608 video decoding circuit, 6
09 ... mixer, 610 ... video output terminal, 611 ... OSD
Processing circuit, 612 control circuit, 613 remote control receiver, 614 IC card

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04H 1/00 H04H 1/00 N H04N 5/00 101 H04N 5/00 101 7/16 7/16 A (72) Inventor Imitomi Satoshi 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the multimedia system development headquarters of Hitachi, Ltd. (72) Inventor Takumi Okamura 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa prefecture Inside the multimedia system development headquarters, Hitachi (72) Inventor Shigeru Yoneda 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref.Hitachi, Ltd.Multimedia Systems Development Headquarters (72) Inventor Naoki Fujimatsu 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa, Japan Media System Development Division

Claims (12)

[Claims] 1. A digital broadcast receiving system for receiving and displaying and reproducing a digital multiplex stream including a plurality of video, audio, and information data. An input switching means for inputting, switching, and outputting at least one of the digital multiplex streams. A separating unit for separating the video, audio, and information data from a single digital multiplexed stream output from the input switching unit; a data transmitting unit for transmitting the separated video / audio data; Control signal input means for inputting a control signal according to a request, and a parent receiving device having control means for controlling the input switching means and the separation means according to the control signal input from the control signal input means, Data receiving means for receiving the video / audio data transmitted from the data transmitting means, and the data receiving means; A video / audio decoding unit for decoding the video / audio data received in step 1, a signal output unit for outputting the decoded video / audio signal, and outputting a control signal according to a user's request to the parent receiving device. A digital broadcast receiving system comprising a slave receiving device having control signal output means. 2. The digital broadcast receiving system according to claim 1, wherein said master receiving apparatus comprises a plurality of digital data distribution means comprising said separating means and said data transmitting means.
A digital broadcast receiving system capable of supporting a plurality of the child receiving devices. 3. The digital broadcast receiving system according to claim 1, wherein said input switching means inputs a plurality of said digital multiplexed streams, and said input multiplexed stream is arbitrarily selected from a plurality of said digital multiplexed streams under the control of said control means. A digital broadcast receiving system output to the digital data distribution means. 4. The digital broadcast receiving system according to claim 1, 2 or 3, wherein said master receiving apparatus encrypts the video / audio data separated by said separating means and outputs it to said data transmitting means. Wherein the child receiving device includes an decryption unit that receives the output of the data receiving unit, decrypts the encrypted video / audio data, and outputs the decrypted video / audio data to the video / audio decryption unit. Digital broadcast receiving system characterized by: 5. A system for receiving and distributing a digital multiplex stream including a plurality of video, audio, and information data, and receiving and reproducing the digital multiplex stream with at least one receiving device. An input switching means for inputting and switching and outputting; a separating means for separating the video, audio and information data from a single digital multiplexed stream output from the input switching means; and Data transmission means for transmitting, control signal input means for inputting a control signal according to a user's request, and control for controlling the input switching means and the separation means in accordance with the control signal input from the control signal input means Means, and the number of digital data distribution means composed of the separating means and the data transmitting means is reduced. A transmission device comprising at least one 6. A system for receiving and distributing a digital multiplex stream including a plurality of video, audio, and information data, and receiving and reproducing the digital multiplexed stream with at least one receiving device. Means, video / audio decoding means for decoding the separated video / audio data, signal output means for outputting the decoded video / audio signal, and a control signal according to a user's request to the transmitting device. Receiving means for outputting control signal output means 7. A digital broadcast receiving system for receiving and displaying and reproducing a digital multiplex stream including a plurality of video, audio, and information data. An input switching means for inputting, switching, and outputting at least one of the digital multiplex streams. A separating unit that separates the video, audio, and information data from a single digital multiplexed stream output from the input switching unit; a video and audio decoding unit that decodes the separated video and audio data; A signal modulation unit that performs analog modulation on the decoded video / audio signal, a control signal input unit that inputs a control signal according to a user's request, and the control signal that is input from the control signal input unit. A parent receiving device having input switching means and control means for controlling the separating means; and A signal demodulator for analog demodulating an image / audio signal, a signal reproducing unit for reproducing a video / audio signal from the demodulated video / audio signal, and a control signal according to a user's request to the parent receiver. A digital broadcast receiving system comprising a slave receiving device having control signal output means. 8. The digital broadcast receiving system according to claim 7, wherein said master receiving device comprises a plurality of analog data distribution means comprising said separating means, said video / audio decoding means and said signal modulating means, A digital broadcast receiving system capable of supporting a plurality of the child receiving devices. 9. The digital broadcast receiving system according to claim 7, wherein said master receiving apparatus comprises a mixing means for mixing output signals of said plurality of analog data distribution means. . 10. The digital broadcast receiving system according to claim 7, wherein said input switching means inputs a plurality of said digital multiplexed streams, and said input multiplexed stream is arbitrarily controlled by said control means. Digital broadcast receiving system output to said plurality of analog data distribution means 11. A system for receiving and distributing a digital multiplex stream including a plurality of video, audio, and information data, and receiving and reproducing the digital multiplex stream with at least one receiving device. An input switching means for inputting and switching and outputting; a separating means for separating the video, audio and information data from a single digital multiplexed stream output from the input switching means; and a decoding of the separated video and audio data Video / audio decoding means, signal modulation means for analog-modulating the decoded video / audio signal, control signal input means for inputting a control signal according to a user request, and control signal input means. Control means for controlling the input switching means and the separation means in accordance with the input control signal; A transmitting device comprising at least one analog data distributing means comprising means, the video / audio decoding means, and the signal modulating means. 12. A system for receiving and distributing a digital multiplexed stream including a plurality of video, audio, and information data, and receiving and reproducing the digital multiplexed stream with at least one receiving device. Signal demodulating means for analog demodulation, signal reproducing means for reproducing a video / audio signal from the demodulated video / audio signal, and control signal output means for outputting a control signal according to a user's request to the parent receiving device. A receiving device comprising: