JP3446784B2 - Data broadcasting device and data broadcasting method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data broadcasting device, a data receiving device and a data broadcasting method which can be used for personal computer communication and the like.

[0002]

2. Description of the Related Art In the field of personal computer communication, modems called modems are provided in a one-to-one correspondence with each of a transmitting side and a receiving side, and these modulating / demodulating devices are connected to both sides through a line. Therefore, the host station is provided with N modulation / demodulation devices,
Connection is possible for each call.

[0003]

[Problems to be Solved by the Invention] Conventional data transmission method
Is a mode in which the transmitting side and the receiving side are connected on a one-to-one basis with a modem.
There is nothing. Therefore, N modulator / demodulators are installed in the host station.
Connection is allowed for N outgoing calls
And, it becomes busy for N or more calls, which is efficient.
It has the drawback that it is difficult to operate.

An object of the present invention is to propose a data broadcasting apparatus, a data receiving apparatus and a data broadcasting method, which can respond to an unspecified number of calls and deliver data.

[0005]

[Means for Solving the Problems] In this invention, all broadcasting
Host computer that repeatedly outputs digital data
Data under the predetermined communication conditions.
A modem that is set to the transmission mode to convert to an audio signal,
The voice signal output from the modem set to the other transmission mode
Modem set to receive mode, receive above
Set the reception mode to the above from the modem set to the mode.
Signal to branch and output the audio signal transmitted to the
Signal extraction circuit, circuit output that outputs the above audio signal to the communication line
A broadcast signal source composed of an input device and a plurality of communications
Equipped with a simultaneous connection function that can connect lines simultaneously
And a communication network capable of transmitting audio signals, and
The voice signal output from the transmission source is transmitted to the communication network.
And one communication line for transmission. here,
From the modem set to the above transmission mode to the above digital
First to transmit a voice signal converted based on data
Step and the modem set to the above reception mode
Second step of receiving voice signal and transmission mode
And the model set to the above reception mode.
The third step for branching the audio signal transmitted to and from
And the above audio signals can be connected simultaneously and in one direction.
Can transmit voice signals that have the function of transmitting data
The fourth step of outputting to the communication network and the receiving device
The fifth step of dialing the communication network and the communication network
The sixth step of connecting to one communication line, and the above sound
The seventh step of transmitting a voice signal and the receiving device
Original digital data obtained by demodulating the transmitted voice signal
8th step to get the
The ninth step of disconnecting is executed. Release this communication network
By using it as a transmission medium, it is possible to
It is possible to connect to one communication line at the same time. Yo
In order to keep the data to be broadcast on this communication network
Allows you to broadcast data to many lines
It

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configurations of a data broadcasting device and a data receiving device, which are the basis of the present invention. In the figure, 1 indicates a communication network. This communication network 1 has a large number of outgoing lines 2A,
It has a simultaneous multi-connection function capable of simultaneously connecting 2B, ..., 2N to the receiving side line 3 which is one communication line. Such a communication network is called "Teledome" or the like and has already been put into practical use.

A broadcast signal source 4 is connected to a receiving side line 3 which constitutes one communication line. The broadcast signal source 4 includes a host computer 5, a converter 6 for converting parallel digital data output from the host computer 5 into a serial audio signal, and an audio signal converted by the converter 6 via a receiving side line 3. It can be configured by the line output device 7 for outputting to the communication network 1.

The host computer 5 repeatedly outputs digital data to be broadcast. The converter 6 is, for example, DA
Although it can be configured by combining a converter and a VF converter (voltage-frequency converter), a modulator / demodulator generally called a modem can be used. Further, in the present invention, a configuration in which the communication network 1 is connected to the broadcast signal source 4 will be hereinafter referred to as a data broadcasting device 8.

A large number of outgoing lines 2A, 2B, ... 2N are connected to the communication network 1 by the simultaneous multiple connection function. The data receiving device 10A is connected to each of the originating lines 2A, 2B, ... 2N.
10B, ..., 10N are connected. Each data receiving device 10
A, 10B, ... 10N are demodulation devices 11 having a communication function.
And a computer 12 that takes in the data demodulated by the demodulation device 11.

The communication function of the demodulator 11 is the communication network 1
It has a function of dialing the broadcast signal source 4 connected to and a function of connecting and disconnecting the line. Specifically, a modem can be used. The demodulation condition of the modem is matched with the conversion condition of the converter 6 provided in the data broadcasting device 8. By matching the demodulation condition with the conversion condition of the converter 6, the original digital data can be demodulated at the output of the demodulation device 11. The computer 12 takes in this digital data and completes the reception. When the reception is completed, the demodulation device 11 disconnects the line 2A or 2B, ..., 2N and stops the output to the computer 12.

Here, the function and effect of matching the communication conditions of the converter 6 and the demodulator 11 will be described. With this condition setting, it is not necessary to exchange the negotiation information that determines the communication condition when the demodulator 11 is connected to the broadcast signal source 4. Further, since the communication network 1 has the simultaneous multiple connection function, even if an unspecified number of data receiving devices 10A to 10N are requested to be connected asynchronously, the connection can be reached for each of them.

FIG. 2 shows an embodiment of a data broadcasting apparatus to which the basic structure shown in FIG. 1 is applied. In this embodiment, the case where the broadcast signal source 4 is configured to generate a synchronization signal indicating the start or end of data is shown. The sync signal can be generated by writing the sync signal in advance at the head and end positions of the digital data output by the host computer 5 and reading it. In the example shown in FIG. 2, a synchronization signal generating means 13 is provided separately from the host computer 5, and the start and end of digital data is indicated from the synchronization signal generating means 13 by a control signal output from the host computer 5 or a manual operation. A case where a synchronizing signal is generated and the synchronizing signal is output to the line output device 7 through the signal extracting circuit 14 is shown. In some cases, only the start of data reception is handled as the synchronization signal. As a data reception start signal, ITU-T V. It is also possible to apply “unscrambled“ 1 ”” in accordance with the connection sequence recommended in 22.

Furthermore, in this example, the modem 6 is used as the converter 6.
The case where A and 6B are used is shown. The modem 6A is set to the transmission mode and converts the digital data output from the host computer 5 into an analog voice signal. Modem 6
B is set to the reception mode under the same communication conditions as the modem 6A, and is connected as a dummy load of the modem 6A.
A means for outputting an audio signal from A is configured. The signal extraction circuit 14 branches the audio signal flowing from the modems 6A to 6B and outputs the branched output to the line output device 7. The line output device 7 outputs digital data with a synchronization signal to the communication network 1 through the receiving side line 3.

In the embodiment shown in FIG. 2, the data receiving device 10
A synchronization signal detector 15 is provided in each of A to 10N, and the demodulation device 11
When connecting to the communication line by the communication function of, the synchronization signal detector 15 detects the presence of a synchronization signal indicating the start and end of data. When the sync signal detector 15 detects the sync signal indicating the start of data, the demodulation device 11 is controlled to the receiving state by the detection output. The demodulation device 11 demodulates the audio signal, restores the original digital data, and inputs it to the computer 12.

When the sync signal detector 15 detects a sync signal indicating the end of data, the demodulation device 1 uses the detection output.
The demodulation operation of 1 is stopped, and the acquisition of data is stopped. At the same time, the demodulation device 11 disconnects the line by the communication function. By broadcasting the synchronization signal as in this embodiment, the receiving devices 10A to 10N can start capturing data in synchronization with the beginning of the data, and terminate the capturing of data when the data ends. Can be taken in without waste.

[0016] illustrates a flow diagram of a to that broadcasting method using the embodiment shown in FIG. 2 in FIG. The digital data to be broadcast to be output from the host computer 5 of a broadcast signal source 4 in step S ₁ shown in FIG. 3 modulates the audio signal, and outputs the audio signal. In step S ₂ , the voice signal is transmitted to a plurality of communication lines 2
Outputs to the communication network 1 having a simultaneous multiple connection function capable of simultaneously connecting to A, 2B, 2C .... Step S ₃
Then, the receiving devices 10A, 10B, 10C ... Are dialed into the communication network 1. In step S ₄ , the receiving devices 10A, 10B, 10C ... Are connected to the communication network 1. In step S ₅ , the synchronization signal generator 12 of the broadcast signal source 4 outputs a synchronization signal indicating the start of transmission to the communication network 1. Step S ₆ in the receiving apparatus 10A, 10B, 10C ···
The sync signal detector 15 detects the start sync signal.

In step S ₇ , the receiving devices 10A, 10B, 10C ...
The demodulation device 11 of starts the demodulation of the audio signal. In step S ₈ , the synchronization signal generator 12 of the broadcast signal source 4 outputs a synchronization signal indicating the end of transmission to the communication network 1. Step S ₉ in the receiving apparatus 10A, 10B, sync signal detector 15 of 10C · · · detects a synchronization signal end transmission. Step S ₁₀ in the receiving apparatus 10A, 10B, is 10C · · · ends the reception of the audio signal.
Received after the end of step S _11, the line is disconnected. Figure 4
Shows an embodiment of the data broadcast apparatus proposed in this filing.
Data broadcasting system proposed in this filing is Ah characterized in that has a structure obtained by adding a one-way communication function to the communication network 1
It

With the configuration in which the one-way communication function is added to the communication network 1, when the data receiving devices 10A to 10N dial the called side line 3, the data receiving devices 10A to 10N.
Even replaced modem demodulation device 11 which constitute the respective data receiver 10A~10N will be unilaterally receive an audio signal from a broadcast signal source 4, the broadcast signal 4 side and the data receiving apparatus 10A By matching the communication conditions of ~ 10N, the connection can be reached without negotiation. Therefore, a large number of data receiving devices 10A to 10N can be asynchronously connected to the receiving side line 3 via the communication network 1 having a simultaneous large number connection function.

The data broadcasting apparatus proposed in claim 1 is shown in FIG.
As shown in FIG. 4, by the modem 6A in which the conversion demon is set in the transmission mode, the modem 6B in the reception mode, and the signal extraction circuit 14 for extracting the voice signal flowing between these modems 6A and 6B in a branched manner. a shall forming structure. According to the data broadcasting apparatus proposed in claim 1, data can be received by the host computer on the transmitting side asynchronously by a large number of inexpensive modems which are currently popular.

[0020] Figure 5 is a data broadcasting equipment proposed in claim 1
In a flow diagram showing a proposed data broadcasting method in 請 Motomeko 2. Modem 6A set to transmission mode in step S ₁
The data converted from the voice signal to the voice signal, step S ₂
Two modems 6A-6B in receive voice data modem 6B set to the reception mode provided separately, in step S ₃
Branching an audio signal flowing between the output of the audio signal in step S ₄ to the multi-connection function and the sound can be transmitted communications network 1 having a function of performing data transmission to one-way, the receiving device is a communication network at step S ₅ 1 Dial, line 3 at step S6
, Send and receive voice signals in step S ₇ , step S ₈
Obtain the original data by demodulating the audio signal in step S ₉
The line is disconnected when the reception is completed.

[0021]

As described above, according to the present invention, since the communication network 1 having the simultaneous multi-connection function is used as the broadcasting medium, the majority of the originating side lines 2A to 2N are connected to the common receiving side line 3. Most of the data receiving devices 10A to 1 are connected.
0N can be connected to a common broadcast signal source 4. Therefore, the common broadcast signal source 4 can distribute digital data to an unspecified number of data receiving devices 10A to 10N. As a result, there is an advantage that the scale of the data broadcasting device can be greatly simplified even though an unspecified number of data receiving devices are targeted for broadcasting.

[Brief description of drawings]

FIG. 1 is a block for explaining the basic concept of this application.
Fig.

FIG. 2 Data broadcasting device and data proposed in this application
The block diagram for explaining the example of a receiving set.

FIG. 3 illustrates a data broadcasting method proposed in this application.
Flowchart for.

FIG. 4 Another implementation of the data broadcasting device proposed in this application
The block diagram which shows an example.

5 is a block diagram of the data broadcasting device and device shown in FIG. 4 of this application.
6 is a flowchart for explaining the operation of the data receiving device.

[Explanation of symbols] 1 Communication network that allows multiple simultaneous connections 2A-2N originating side line 3 Called side line that operates as one communication line 4 Broadcast signal source 5 Host computer 6 converter Modem set to 6A transmission mode Modem set to 6B receive mode 7 line output device 8 Data broadcasting equipment 10A to 10N data receiving device 11 Demodulator with communication function 12 computers 13 Synchronous signal generating means 14 Signal extraction circuit 15 Sync signal detector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsumi Kishida               1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo               Nippon Telegraph and Telephone Corporation (72) Inventor Kazuo Sakai               1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo               Nippon Telegraph and Telephone Corporation (72) Inventor Ikutoshi Mizumoto               1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo               Nippon Telegraph and Telephone Corporation (72) Inventor Hironobu Fukunaga               1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo               Nippon Telegraph and Telephone Corporation (72) Inventor Kazuhiro Hayakawa               1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo               Nippon Telegraph and Telephone Corporation (72) Inventor Hajime Sasaki               1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo               Nippon Telegraph and Telephone Corporation                (56) References JP-A 64-89656 (JP, A)                 JP, 3-162030 (JP, A)                 Naoki Takeda / Ryoji Takaichi ""               "Tele service" service started "               NTT Technology Journal, vol. 6, N               o. 3, issued March 1, 1994, P. 17               -20

Claims (2)

(57) [Claims] 1. A host computer for repeatedly outputting digital data to be broadcast, a modem set to a transmission mode for converting the digital data into an audio signal under a predetermined communication condition, and a modem set to this transmission mode. A modem set in a reception mode for receiving a voice signal output from the modem, and a signal extraction circuit for branching and outputting a voice signal transmitted from the modem set in the transmission mode to the modem set in the reception mode. , A broadcast signal source configured by a line output device for outputting the above audio signal to a communication line, and B. a simultaneous connection function capable of simultaneously connecting a plurality of communication lines, and transmitting an audio signal. And a communication network capable of transmitting the audio signal output from the broadcast signal source to the communication network. Data broadcasting system according to claim and. 2. The data broadcasting apparatus according to claim 1 , wherein A. a first mode in which the modem set to the transmission mode transmits an audio signal converted based on the digital data.
B. The second step in which the modem set in the reception mode receives the voice signal, and C. The step between the modem set in the transmission mode and the modem set in the reception mode. Third step of branching the audio signal to be transmitted, and D. Fourth output of an audio signal having a function of simultaneously connecting multiple audio signals and a function of performing data transmission in one direction to a communication network capable of transmitting data. Step E. a fifth step in which the receiving device dials the communication network, F. a sixth step in which the communication network connects to the one communication line, and G. the voice signal is transmitted. A seventh step; H. an eighth step in which the receiving device demodulates the transmitted voice signal to obtain original digital data; and I. a ninth step in which the connection is cut off upon completion of reception. Characterized by performing Data broadcasting method.