JPS62221228A - Information retrieval system using communication satellite and wire network - Google Patents

Abstract

PURPOSE:To keep the information transmission quality high while reducing the cost of equipment by using a switched line or the like as the transmission line of an information request signal of less data and using a communication satellite for an information signal of much data. CONSTITUTION:A terminal machine 2 is installed in each user which closes a contract to request information. When the user inputs request information with keys, the information request signal is outputted to a central information controller 1 from the terminal machine 2 through a wire network 3. The central information controller 1 retrieves information corresponding to the inputted information request signal and converts retrieved information and a control signal to a radio signal and outputs this signal to a communication satellite 4. When the communication satellite 4 transmits the radio signal to terminal machines 2 in a service area after repeating it, terminal machines 2 receive the radio signal from the communication satellite 4 with a designated reception frequency band and transmit request information.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention automatically searches for requested information from a user who uses information from a large amount of information stored in a central information management device and transmits the information to the user. In detail, the information retrieval system uses existing wired networks such as public lines for information requests from users, while the information retrieval system uses communication WI star as a means of transmitting information from the central information management device. It is something to do.

(Prior Art) Conventionally, an information retrieval system that searches for information such as one character, two images, etc. of music stored in a central information management VR suite based on a user's request and transmits it to the user uses an optical fiber or a signal 'ai'. There are methods that utilize two-way communication means, such as wired communication means using wires as a signal transmission medium, and wireless communication means using FM communication, AM communication, or communication satellites.

In the information retrieval systems that use either wired or wireless communication means, the amount of information request data transmitted from the user's terminal to the central information management device is extremely small; The amount of information such as one image of music to be transmitted becomes extremely large.

Therefore, information transmission communication equipment using two-way communication means must be suitable for handling a large amount of data such as nine images of music.

From this point of view, since the signal cable method is affected by noise and the like, and there is a limit to the amount of data that can be transmitted, in the case of wired communication means, a method using optical fibers, which is less affected by noise, etc., is adopted.

On the other hand, in the case of wireless communication means, FM communication and AM communication using ground transmitting stations have limits on the area where information can be transmitted due to topography, etc., so a method using communication satellites is adopted.

(Problems to be Solved by the Invention) Among the conventional information retrieval systems mentioned above, in the case of wired communication means using optical fibers, optical fiber cables are used between the central information management device and the terminals of many users. On the other hand, in the case of a wireless communication method that uses communication WI, each user's terminal must also be equipped with wireless transmission equipment, so the equipment cost is high in both cases. There was a problem.

Therefore, in the present invention, an existing public line or the like is used as a transmission path for an information request signal with a small amount of data n to be transmitted from the user side to the central information management device, while the information request signal is transmitted from the central information management device to each user's terminal. For information signals with a large amount of data, the use of communication satellites provides an advantageous means of communication that can reduce equipment costs and maintain a high level of information transmission quality, allowing smooth transmission of information through two-way communication. The technical problem to be solved is to make it possible.

(Means for solving problem 121) The technical means for solving the above problem is to create an information retrieval system using communication satellites and a wired network, which is synchronized every time a user requests information such as 9 music characters and 1 image. A terminal device that outputs an information request signal corresponding to request information, receives request information transmitted by a wireless signal, and displays the information; and a public device that transmits the information request signal output from the terminal device. A wired network such as a line, and information corresponding to the information request signal is received from a large amount of information stored in advance by receiving the information request signal transmitted on the wired network, and the same information as the searched information is received. a control signal specifying a reception frequency band for radio reception by the terminal; a central information management device that converts the signal into a radio signal and outputs the signal; and a central information management device that relays and receives the radio signal output from the central information management device. and a geostationary communication satellite that transmits radio signals relayed to the terminal.

(Function) According to the information retrieval system using the communication satellite and wired network configured as described above, each user who has signed a contract to request information is equipped with a terminal.
When the user keys in request information, an information request signal is output from the terminal to the central information management device via the wired network. The central information management device searches for information corresponding to the input information request signal, converts the searched information and the control signal into a radio signal, and outputs the wireless signal to the communication satellite. The communication satellite relays the radio signal and transmits it to terminals in the service area, which then receives the radio signal from the communication satellite in the designated reception frequency band and outputs the request information. .

(Embodiment) Next, the structure and operation of an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 shows the overall configuration of a music data search system for searching music data recorded on compact discs (hereinafter referred to as CDs) of the central information management device 1 in response to a user's request. As shown in the figure, the music data retrieval system includes a central information management device 1, a terminal device 2 provided for each knee TF, an existing wired network 3 such as a public telephone line, and a stationary broadcasting satellite 4.
The central information management device 1 and a large number of terminals 2 provided for each user are connected by wire via a wired network 3, while there is a broadcast i-star 4 connection between the two.
A wireless transmission path is formed with .

In the above-mentioned music data search system, the central information management device 1 receives a music selection data signal such as music genre, country name, player name, 0 song name, etc. transmitted from the user's terminal tR2 via the wired network 3, and converts it into a music selection data signal. The searched music data and a control signal specifying the channel number to transmit the music data are converted into wireless data and transmitted to the broadcasting satellite 4, and the broadcasting satellite 4 is configured to search for music data based on the wireless data. is relayed to the terminals 2 in the service area, and each terminal 2 in the service area transmits the control signal J:
The system automatically selects a reception channel, receives the corresponding music data, and plays the music from the speaker.

As shown in FIG. 1, the central information management bag M1 is equipped with a computer CPtJ with a capacity M adapted to the capacity of music data and the number of users as its core, and the input side of the computer CPU is A line control circuit CCP is connected to the wired network 3 for converting the music selection data signal transmitted from each user's terminal 2 into a signal that can be input by the computer CPU. The main storage is, for example, disk D.
ISK1 and DISK2 are connected and the disk
1 stores user identification (10) data and usage fees (satellite iStOry fees) accumulated each time each user uses music data. Further, 7 filling information of the music data recorded on the CD is stored on the disk DISK2.

A file controller FC is connected to the output side of the computer CPU, and the file controller FC searches the disk DISK 2 for the filing information of the CD on which the music data corresponding to the music selection request from the user is recorded by the computer CPLJ, and sends the file to the computer. When the retrieved CD filing information is input from the CPU, the filing address of the CD in the CDFS, a CD data filing device that stores many CDs, is numerically expressed as the X value and Y value of the X axis and Y axis. While outputting to controller NG, CD data file is output.

It outputs CD search data to the CDFS of the Ayring device, and also outputs the track number, player, and channel number for receiving music data (to the mixer MIX described later).
CHIkl) are respectively output as code signals.

The numerical controller NC which inputs the XYli1 from the file controller FC outputs a drive signal to the CD data filing device CDFS having the configuration shown in FIG. A servo motor (not shown) or the like is driven to move the CD storage rack in the direction, and a pickup PU picks up the target CD stored in the CD storage rack RAC.

The CD data filing device cDFS collates the picked up CD with the CD search data outputted from the file controller FC, and transfers the CD data to the data editing unit DAE for editing target music from the picked up CD. Transmit and edit. The CD data edited by the data editing unit DAE is transferred to the mixer MIX
is combined with the track number, player, and channel number signals output from the file controller FC,
It is output to the modulation circuit MOD as music data and control signals. The music data and control signals are modulated by the modulation circuit MOD and then output to the transmission facility TRM. Transmission installation aT
The RM converts the modulated signal modulated by the modulation circuit MOD into antenna transmission power, and transmits it to the broadcasting satellite 4 from, for example, a parabolic transmission antenna T AN T. The radio waves transmitted from the transmitting antenna TANT of the central information management device 1 are received by the broadcasting satellite 4, and the radio waves relayed by the broadcasting satellite 4 are transmitted to the receiving antenna RANT of each user's terminal 12.
received at

In each user's terminal 2, as shown in Fig. 1, the radio waves from the broadcasting satellite 4 received by the receiving antenna RAN are high-frequency amplified by the converter COV, and then the radio waves are amplified by the converter COV. Music data, program data,
It is demodulated into a digital signal containing player data.

Since the digital signal demodulated by the demodulation circuit DMO includes the above-mentioned track data and player data in addition to the music data, only the music data is extracted through the filter circuit FIG, and then the music data is sent to the D/A conversion circuit DAC. The audio signal is converted into an audio signal by an amplifier AMP, and stereo music is reproduced from left and right speakers L and R, respectively.

The high-frequency amplified signal outputted from the converter COv includes a music data signal to be tuned by the music data channel selection circuit MC and a control signal for designating a reception channel, and the control signal is a control signal selection signal. The station circuit CC selects the station and inputs it to the microcomputer MCPU. When the microcomputer MCPU receives the reception channel designation signal output from the control signal tuning circuit CC, it outputs a reception channel signal for causing the local oscillation circuit O8C to transmit the frequency of the corresponding channel. That is, the microcomputer MCPLJ selects the next channel on which the music data is to be tuned from the high frequency amplified signal output from the converter COv, based on the control signal.

On the other hand, when the user requests music, the user operates the keyboard KB provided on each terminal 2 to set music selection data such as the music genre, country name, player name, first song, etc. After the music selection data is displayed on the DISP, it is stored in the memory MEM, and the transmission key of the keyboard KB is pressed to cause the modem MODM to transmit the music selection data and the identification code of each user, that is, the user ID.

Song selection data and user ID sent from modem MODM
is transmitted to the line control circuit CCP of the central information management unit 1 via a wired network 3 such as a public line, and thereafter iyI
The music requested by the user is played back from the speakers L and R by the writing action.

Note that if there is no request from the user, it is also possible to allocate reception channels to each music genre and repeatedly transmit a large number of music data for each genre. Further, the music data can also be transmitted by time division, with a plurality of pieces of data (for stereo) per channel.

Furthermore, it is possible to scramble the music data output from the central information management device and transmit the music data only to a specific user. This is effective not only when the information is music, but especially when information requires secrecy. Note that, as a matter of course, it is also possible to transmit combined information such as one music character and two images in accordance with a user's request.

(Effects of the Invention) As described above, according to the present invention, an information request signal from a terminal with a small amount of data for requesting information is transmitted to the central information management device via a wired network such as an existing public line. On the other hand, music, each character, each picture frame, etc., which contain a large amount of data, are transmitted from the central information management unit to the terminals via communication satellites, which reduces equipment costs and maintains a high level of information transmission quality. There is an effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the overall configuration of an embodiment of the present invention, and FIG. 2 is a partial detailed diagram thereof. 1... Central information management device 2... Terminal 3... Wired network 4... Broadcasting satellite

Claims (1)

[Claims] A terminal device that outputs an information request signal corresponding to the request information each time a user requests information such as music, text, images, etc., and also receives request information transmitted by wireless signals and displays the information. , a wired network such as a public line that transmits the information request signal output from the terminal, and receives the information request signal transmitted over the wired network and requests the same information from a large amount of information stored in advance. a central information management device that searches for information corresponding to the signal, converts the searched information and a control signal that specifies a reception frequency band when the terminal receives the information wirelessly into a wireless signal, and outputs the same; and a stationary communication satellite that relays and receives the wireless signal output from the central information management unit and transmits the relayed wireless signal to the terminal device. Information retrieval system.