JPH07143027A - Data communication equipment of spread spectrum system - Google Patents

Abstract

PURPOSE:To improve working efficiency with conventional constitution by performing data spread by plural spread codes by allocating supplied data to be transmitted to plural channels. CONSTITUTION:The data sent out from a data supply means 450 is sent to a data control means 404 via an interface 402 according to the control of a control means 403. The control means 404 sends out the data to multipliers 406-408 on the plural channels simultaneously. On the other hand, a spread code generating means 405 sends out the spread codes set as to be sufficiently poor in mutual correlation to the multipliers 406-408. The data and the spread code arriving from the means 404 and 405 are multiplied by the multipliers 406-408, and any they are spread-encoded, mixed by a mixer 409 and transmitted. An inquiry signal supplied from a data supply means 401 for check is also sent to the control means 404. The control means 404 sends it out to all of registered channels placed on the control means 403, and transmits it in a simular manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device for transmitting data by a spread spectrum system.

[0002]

2. Description of the Related Art Conventionally, in data transmission by a spread spectrum system, high speed and high quality data transmission is possible.

A plurality of data spread-coded using a plurality of different spreading codes use the same spreading code as the transmitting side when demodulating and despreading at the receiving side even if modulated at a common frequency. Since only the target code can be taken out by using the above, it is possible to easily construct a communication system in which a plurality of communication channels share one frequency.

[0004]

On the other hand, the data transmission by such a spread spectrum system achieves the improvement of the complicated wiring network in the wired communication, and the work efficiency in the current configuration (copying apparatus, facsimile, computer, etc.). It is desirable to realize up.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a spread spectrum type data communication apparatus capable of improving work efficiency in the current configuration (copier, facsimile, computer).

[0006]

DISCLOSURE OF THE INVENTION The present invention is a spread spectrum data communication system, and a check data supply means for supplying data for checking a communication device which can be transmitted first and transmission. Transmission data supplying means for supplying data, interface means for receiving the transmission data, spreading code generating means for generating a plurality of spreading codes, and data received from the interface means for simultaneously transmitting the same contents to a plurality of channels. Data control means for sending out, data sent by the data control means are coded by the spreading code generating means, each coded signal is simultaneously transmitted to a plurality of data communication devices, and a plurality of devices are operated at the same time. And is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as a first embodiment of the present invention, a configuration in which arbitrary data is distributed to a plurality of channels and transmitted to a plurality of copying machines will be described.

In the spread spectrum system, the transmitting side generally uses a spread code such as a pseudo noise code for a base band signal of original data such as digitized voice and image data to be transmitted, as compared with the original data. Convert to a baseband signal with a wide bandwidth. Furthermore, the converted signal is modulated by a method such as PSK or FSK modulation,
Form and transmit high frequency signals.

The receiving side uses the same spreading code as the transmitting side to perform despreading for correlating with the receiving side to demodulate the original data.

An outline of spread spectrum communication will be described with reference to FIGS. 8 to 10.

The original data d (t) input to the multiplier 6-1 of FIG. 8 on the transmitting side has a waveform as shown in FIG. 9 and has the spectrum of FIG.

The spread signal p (t) which is the other signal input to the multiplier 6-1 of FIG. 8 has a waveform as illustrated in FIG. 9 and has the spectrum of FIG. Since the conversion of the spread code p (t) is far more intense than the conversion of the original data d (t), the spectrum of FIG. 10 has an extremely wide band.

In the multiplier 6-1 of FIG. 8, the data d
(T) is spread by being multiplied by the spreading code p (t). The output of the multiplier 6-1 has the waveform shown in FIG. 9 and has a spectrum with the same bandwidth as shown in FIG. The output signal of the multiplier 6-1 is further mixed in the mixer 6-2 with the carrier wave output from the local oscillator 6-3. The waveform of this carrier wave is shown in FIG. The output of the mixer 6-2 has the waveform shown in FIG. 9 and the spectrum shown in FIG. 10, and is output from the antenna 6-3.

On the receiving side, the spectrum of the signal received on the antenna 6-5 in FIG. 8 generally includes various signals in addition to the desired signal transmitted by the transmitting side, as shown in FIG. For example, there are noise, a signal transmitted by another station, and a narrow band interference signal. The received signal including these signals is mixed in the mixer 6-6 with the same spread code p (t) as that on the transmitting side and converted into a signal having the spectrum shown in FIG. That is, the desired signal corresponding to the spreading code p (t) in the received signal is despread and narrowed to a bandwidth corresponding to the bandwidth of the original data.

On the other hand, undesired signals, that is, other station signals that do not have the same spreading code, narrow band interference signals, etc. are spread,
It is converted into a wideband signal.

The spreading code used for modulation and demodulation is
The communication channels are set and assigned such that their mutual correlation is sufficiently small. Therefore, even if the signals spread by different codes are despread and demodulated, they become wide band noise, and only the target signal can be extracted.

This allows multiple access by code division. That is, a common frequency can be used for multiple communication channels.

The output signal of the mixer 6-6 subsequently has a bandpass filter 6-7 having a bandwidth corresponding to the bandwidth of the original data.
And is converted into a narrow band signal having the spectrum shown in FIG. Furthermore, the narrowband signal is shown in FIG.
The demodulator 6-8 demodulates the data by normal PSK or the like to reproduce the original data.

FIG. 1 is a block diagram showing a transmitting section of a spread spectrum data communication apparatus according to this embodiment. In the figure, a portion surrounded by a dotted line is the data communication device 400.
Is.

The data supply means 450 is means for supplying data to be transmitted to the data communication device 400, and is, for example, an image scanner, a copying device capable of supplying digital data, a host device for in-house electronic mail, a hard disk. A workstation or the like having an external storage device such as.

The data sent from the data supply means 450 is sent to the data control means 404 via the interface 402 under the control of the control means 403. The data control means 404 sends the incoming data to a plurality of channels simultaneously with the same contents to the multipliers 406 to 408.

The setting of the number of channels is instructed by the control means 403. That is, in this embodiment, the data control means 404 can supply data to the three communication channels, and which data communication device can be freely set.

On the other hand, the spread code generating means 405 sends spread codes to the multipliers 406 to 408 which are set so that their mutual correlations are sufficiently small.

The data and spread code received from the data control means 404 and the spread code generation means 405 are multiplied by the multiplier 4
Spread coding is performed by being multiplied by 06 to 408. The signals spread-coded in the multipliers 406 to 408 are mixed into one signal by the mixer 409, modulated by the modulator 410, power-amplified to a specified output by the amplifier 411, and transmitted from the antenna 412 to the air.

Further, check data supply means 401
Is a data supply means for supplying an inquiry signal for checking a receivable data communication device. The inquiry signal supplied from the check data supply means 401 is also sent to the data control means 404 via the interface 402 under the control of the control means 403, similarly to the data supplied from the data supply means 450.

In the data control means 404, the control means 40
It is sent to all the channels of the data communication device registered in No. 3, and the same is transmitted thereafter.

FIG. 2 is a block diagram showing a system configuration example using the data communication device of this embodiment.

The data supply device 450 connected to the data communication device 400 comprises a workstation 501, a large capacity auxiliary storage device 502 and a scanner 503 connected to the workstation 501.

Data communication devices 504 to 506 are connected to the copying devices 507 to 509, respectively, and the data communication devices 504 to 506 receive data while handshaking with the data communication device 400 and are connected. The data is supplied to the copying machines 507 to 509.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

When transmitting data from the data supply means, first, the user inputs the number of copies, copy magnification, double-sided copy, etc. (copy mode) to the workstation which is the data supply means (S602).

Next, the data communication device performs a receivable device check by sending a transmission request to the data communication device on the transmission side (S603). Check this receivable device (S
In 603), the check data is code-spread corresponding to each data communication device on the reception side and then transmitted, and the presence or absence of a receivable device is checked by receiving a reply from each communication device.

If there is a receivable communication device,
By the copy mode check (S604), it is checked whether or not the copy mode connected to the receivable communication apparatus can use the copy mode desired by the user. If the copy mode check (S604) can be used, information such as the time required to copy the desired number of sheets and the name of the copy apparatus to be output is displayed on the workstation by the copy apparatus connected to the receivable communication apparatus. Displayed on (S60
5).

Based on this, the user inputs the desired combination (mode) of the copying apparatus to the workstation (S606), and the transmission side communication apparatus is instructed to transmit the data to the channel corresponding to the mode. Notify (S
607) and data transmission is started (S608).

Further, when there is no receivable communication device or when there is no copy mode on-board machine desired by the user, it is displayed that transmission is not possible (S609) and the process ends. For example,
By simultaneously transmitting data to three data communication devices whose copying speed of the copying device connected to the receivable communication device is 60 sheets per minute, a total of 18 minutes per minute is apparent.
A copy speed of 0 sheets can be obtained.

Next, as a second embodiment of the present invention, a description will be given of a structure in which arbitrary data is distributed to a plurality of channels using a spread spectrum system, and different information is attached to each channel and transmitted to a plurality of facsimile machines. To do.

The structure of the transmission section of the data communication device is the same as that of the first embodiment (FIG. 1), and the data control means 404 is used.
In step 1, information such as a facsimile transmission destination number is attached to each of the distributed data, and code spreading is performed in the same manner, and the data is transmitted.

FIG. 4 is a block diagram showing an example of system configuration using the data communication apparatus of this embodiment.

The data supply device 450 connected to the data communication device 400 comprises a workstation 701, a large capacity auxiliary storage device 702 and a scanner 703 connected to the workstation 701.

Data communication devices 704 to 706 are connected to the facsimile devices 707 to 709, respectively, and the data communication devices 704 to 706 are connected to the data communication device 4.
Receive data while handshaking with 00,
Data is supplied to the connected facsimiles 707 to 709.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

When transmitting data from the data supply means, the user first inputs information such as a facsimile transmission destination to the workstation (S802).

Next, by sending a transmission request to the data communication device on the transmission side, the data communication device checks the receivable device (S803). This receivable machine check (S8
In 03), the check data is transmitted after being subjected to code spreading corresponding to each data communication device on the receiving side, and the presence or absence of a receivable device is checked by receiving a reply from each communication device.

If there is a receivable communication device,
Then, the number of facsimile transmission destinations is checked (S804). If the number of facsimile transmission destinations is equal to or more than a predetermined reference value N, the reception capability is continuously checked (S80).
5) is performed and the number of receivable devices is compared with the number of facsimile transmission destinations.

Then, this reception capability check (S80
If the number of receivable devices is insufficient in 5), the user
By inputting the priority order to the facsimile transmission destination in the workstation (S806), it is decided to transmit the priority to the destination to which the facsimile transmission is desired in a hurry.

If there is a sufficient number of receivable devices in the reception capability check (S805), the communication device is informed that transmission will be performed on all empty channels after S806 (S807), and transmission is started. Yes (S808).

If the number of facsimile transmission destinations is less than N in the facsimile transmission destination number check (S804), the communication device is notified that the transmission is to be performed by one channel (S809), and the transmission is started (S808).

If there is no receivable device, the fact that transmission is not possible is displayed on the workstation (S
810) and ends.

With this configuration, the user can transmit the data sequentially and in parallel to the destination that he / she wants to send to the facsimile preferentially, and the efficient facsimile transmission becomes possible.

Next, as a third embodiment of the present invention, a configuration in which personal computer education is performed by distributing arbitrary data to a plurality of channels and transmitting the data to a plurality of personal computers will be described.

The structure of the transmission section of the data communication device is the same as that of the first embodiment (FIG. 1).

FIG. 6 is a block diagram showing a system configuration example using the data communication device of this embodiment.

The data supply device 450 connected to the data communication device 400 comprises a workstation 901 and a large capacity auxiliary storage device 902 connected to this workstation 901. Personal computer 906-
Data communication devices 903 to 905 are connected to 908, respectively, and the data communication devices 903 to 905 receive data while performing a handshake with the data communication device 400, and the connected personal computer 90.
Data is supplied to 6 to 908.

Next, the operation of this embodiment will be described with reference to the flow chart shown in FIG.

When data is transmitted from the data supply means, first, a transmission request is sent to the data communication device on the transmission side, so that the data communication device checks the receivable device (S1002).

In this receivable device check (S1002), the check data can be received by performing code spreading corresponding to each receiving side data communication device and then transmitting, and receiving a reply from each communication device. Check for the presence of different devices.

If there is a receivable device, an endless loop is executed until all communication devices are in the receivable state (S
1003). After all the communication devices are in the receivable state, the communication device on the transmitting side is notified that the transmission is to be performed using all channels (S1004), and data transmission is started (S1005).

After that, the reply to the data is received from the personal computer attached to the communication device of the transmission destination (S1006), and the reply to the reply is sent back to the channel corresponding to the transmission destination. (S1007) and sends a reply (S10).
08).

In addition, the receivable device check (S100
If there is no receivable device in 2), the fact that transmission is not possible is displayed on the workstation (S1009),
finish.

With this configuration, it becomes possible to accurately carry out question and answer in personal computer education.

[0061]

As described above, according to the present invention,
In a spread spectrum data communication device, a plurality of spread code generating means are provided, the supplied data to be transmitted is distributed to a plurality of channels, and data is spread by a plurality of spread codes, whereby parallel transmission of data is possible. Therefore, there is an effect that the work efficiency in the current configuration of the copying apparatus, facsimile, computer, etc. can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a transmission unit of a spread spectrum data communication apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a system configuration example of the first embodiment.

FIG. 3 is a flowchart showing the operation of the first embodiment.

FIG. 4 is a block diagram showing a system configuration example in a second embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the second embodiment.

FIG. 6 is a block diagram showing a system configuration example in a third embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the third embodiment.

FIG. 8 is a circuit diagram showing an outline of spread spectrum communication.

9 is a time chart showing the operation of the circuit shown in FIG.

10 is a waveform diagram showing each signal waveform of the circuit shown in FIG.

[Explanation of symbols]

 400 ... Data communication device, 402 ... Interface, 403 ... Control means, 404 ... Data control means, 405 ... Spreading code generation means, 406-408 ... Multiplier, 409 ... Mixer, 410 ... Modulator, 411 ... Amplifier, 412 ... Antenna, 450 ... Data supply means.

Claims (1)

[Claims] 1. A spread spectrum data communication system, wherein check data supplying means for supplying data for checking a communication device capable of transmitting first, and transmission data supplying means for supplying data to be transmitted. Interface means for receiving the transmission data; spreading code generating means for generating a plurality of spreading codes; data control means for sending the same contents of the data received from the interface means to a plurality of channels simultaneously; Data transmitted by the control means is encoded by the spread code generating means, each encoded signal is simultaneously transmitted to a plurality of data communication devices, and a transmitting means for operating a plurality of devices at the same time; Spread spectrum data communication device.