JP3235491B2 - Wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system for transmitting data from a slave unit having a wireless communication function to another base station similar to the master unit through a master unit of the base station. In particular, the present invention relates to a wireless communication system in which a base unit is connected to a plurality of lines and includes a smaller number of modems than the number of lines.

[0002]

2. Description of the Related Art The use of wireless communication systems using a base unit as a base station connected to a line and a slave unit for performing wireless communication with the base unit is rapidly expanding. Such a wireless communication system has been conventionally used as a voice communication system. That is, when audio is transmitted from the slave unit, the audio data is wirelessly transmitted to the master unit, and the master unit transmits the received audio data to another base station via the line. The voice data received from another base station is also communicated to the slave through the reverse route. Recently, with the widespread use of data communication, a wireless communication system that performs data communication such as facsimile communication in the same data format as voice data has appeared.

FIG. 20 shows an example of a conventional wireless communication system which enables such data communication. In this figure, master unit 111 is an analog line 1 such as a public line.
12 and one or more slave units 113
(Only one is shown in the figure.) Inside the base unit 111, a base unit side wireless communication unit 121 for performing wireless communication with the slave unit 113, and an ADP
CM (Adaptive Differential Pulse Code Modulation)
AD for returning digital data modulated by adaptive differential pulse code modulation to original analog data.
PCM 122, a line control unit 123 for modulating analog data obtained from ADPCM 122 and sending out to line 112, and a CPU for controlling the entire master unit.
(Central processing unit) 124. The slave unit 113 includes a slave unit-side wireless communication unit 131 for communicating with the master unit-side wireless communication unit 121 of the master unit 111, a scanner 132 for reading an image, and digital data read by the scanner 132. A modem 133 for modulating the image data as an image, and an ADPCM 134 for PCM encoding the analog data modulated by the modem 133
And the data sent from the base unit 111
Output unit 13 for printing out after demodulation at 3
5 is provided. The slave unit 113 includes a CPU 136 for performing overall control thereof.

When ordinary voice communication is performed from the slave unit 113 in such a conventional wireless communication system, an audio signal obtained from a transmitter (not shown) is converted into digital data by the ADPCM 134, and the slave side wireless communication is performed. Communication unit 13
1 and the master unit 11
Sent to one side. On the base unit 111 side, this is demodulated by the base unit side wireless communication unit 121 and returned to the original audio data by the ADPCM 122. Then, this is modulated by the line control unit 123 and transmitted to the line 112, so that voice is transmitted to another base station (not shown). The voice data transmitted from the partner base station is transmitted to the slave unit 113 via the reverse route, and the voice is reproduced by the receiver (not shown).

The slave unit 113 having the configuration shown in FIG. 20 has a facsimile communication function, and can transmit image data read by the scanner 132 to the other party.
In this case, when the image is read from the scanner 132, 2
The digital data of the value is input to the modem 133 and converted into analog data similar to voice data. The analog data is encoded by the ADPCM 134 to be digital data, modulated by the slave-side wireless communication unit 131, and sent to the master unit 111 via the wireless line 114. On the base unit 111 side, this is
And demodulates them into analog data using the ADPCM 122. The analog data is modulated by the line control unit 123 and transmitted to the line 112, and the image data is communicated to another base station (not shown). When performing data communication such as facsimile communication in this way, ADPCM
At 122, the data is converted into pseudo-same data as the voice data and then transmitted to the line 112. Therefore, such data communication is called “deemed voice communication”.

By the way, when performing "deemed voice communication" as shown in FIG. 20, it is necessary to prepare ADPCM 134 in the slave unit and convert analog data into digital data. The data conversion speed of ADPCM134 is 32K
It is constant at bps, but the modem 13
The modulation method of No. 3 becomes complicated, and the input waveform becomes complicated. Therefore, when adaptive differential pulse code modulation is performed at a low speed, data errors are small when the modulation is performed, but data errors increase at a high speed. For this reason, when performing “deemed voice communication” that requires ADPCM, the data transfer rate is limited,
There is a problem that high-speed data communication such as facsimile communication and image transmission that requires transfer of a large amount of data cannot be performed.

Of course, it is possible to reduce data errors by making the data to be transmitted redundant to some extent using existing data processing techniques such as error correction control. However, since the communication speed of "deemed voice communication" using ADPCM is a problem, making the data configuration redundant is a major obstacle to achieving high-speed communication. Therefore, a wireless communication system that performs data communication without using ADPCM has also been proposed.

FIG. 21 shows a configuration of a conventional wireless communication system in which data communication is performed without using ADPCM. In this wireless communication system, master device 1
Reference numeral 41 is connected to a general analog line 142 similar to that shown in FIG. 20, and is connected to one or a plurality of slave units 143 (only one is shown in the figure) by a wireless line 144. Inside the base unit 141, a base unit side wireless communication unit 151 for performing wireless communication with the slave unit 143, and a modem 152 for modulating data demodulated by the base unit side wireless communication unit 151.
And a line control unit 153 for transmitting the modulated digital data to the line 142, and a CPU 154 for performing overall control of the master unit 141. In addition, child unit 1
Reference numeral 43 has a facsimile communication function as in the slave unit 113 shown in FIG. 20, and has a scanner 161 and an output unit 162 for printout. The slave-side wireless communication unit 163 directly modulates image data as digital data obtained from the scanner 161 and
4 for transmitting the data to the base unit-side wireless communication unit 151 via the communication unit 4 or receiving the data sent from the base unit-side wireless communication unit 151 and supplying the data to the output unit 162. C
The PU 164 is used for overall control of the slave unit 143.

In the wireless communication system having the configuration shown in FIG. 21, transmission data obtained from the scanner 161 of the slave unit 143 is modulated by the modem 133 and encoded by the ADPCM 134 as shown in FIG. Is sent to the parent device 141 side without taking the same. Base unit 14
On the 1 side, the data demodulated by the base unit side wireless communication section 151 is modulated by the modem 152 to be converted into analog data, and the line control section 153 modulates this and sends it out to the line 142. That is, in the wireless communication system shown in FIG. 21, since the ADPCM 134 existing on the slave unit side in FIG. 20 is removed, the obstacle to the high-speed communication as described above is eliminated, and the data communication can be performed at a high speed. As a result, communication of data having a large data amount such as image data can be performed in a short time.

[0010]

In such a conventional wireless communication system, if data communication such as facsimile communication is to be performed from the slave unit side, it is difficult to perform "deemed voice communication" as described with reference to FIG. As shown in FIG. 21, data communication is performed in a format in which the modem 152 is mounted on the master unit. Of these, the wireless communication system shown in FIG. 21 actually needs to also perform voice data communication, and thus has a device configuration in which the functions shown in FIG. 20 are mixed, and uses the ADPCMs 134 and 122. Both “deemed voice communication” and communication without using the ADPCMs 134 and 122 can be performed. In this specification, the data transmitted from the slave unit to the master unit at the time of communication using the ADPCMs 134 and 122 is once converted from digital data to analog data.
Data transmitted from the child device to the parent device without using 4, 122 is referred to as high-speed digital data because it is transmitted to the parent device without converting digital data into analog data.

By the way, if the wireless communication system is of a mixed type in which the wireless communication system shown in FIG. 20 is added to the wireless communication system shown in FIG. 21, the control on the slave unit side becomes complicated or complicated. is there. That is, it is assumed that the slave unit requests the master unit to perform communication using high-speed digital data in order to perform emergency facsimile communication. Since the master unit can communicate with a plurality of slave units, one of the slave units may be communicating with high-speed digital data. In this case, the modem of the master unit is in use. It is. When the modem is in use, the slave unit that has newly requested facsimile communication as data communication cannot send high-speed digital data to the master unit side. Even if the modem is busy, if multiple lines are connected to the master unit, there may be unused lines,
The slave uses it to send the converted digital data,
"Deemed voice communication" can be performed. However, when the type of data is changed in this way, the slave unit issues a communication request to the master unit again, and the "deemed voice communication"
Must try. For this purpose, it is necessary to make a call again from the child device to the parent device. Of course, such a problem does not occur when the number of modems is equal to the number of lines, but the modem is relatively expensive, which not only makes the wireless communication system expensive, but also reduces the operating rate of the modem. Therefore, an efficient system cannot be realized.

Although the facsimile communication has been described as an example of the data communication, other data communication such as file transfer has the same problem.

Accordingly, an object of the present invention is to enable simple and efficient data communication such as facsimile communication with a slave unit when the number of modems on the master unit side is smaller than the number of lines. An object of the present invention is to provide a wireless communication system.

Another object of the present invention is to provide a wireless communication system capable of performing data communication such as facsimile communication as fast as possible under various circumstances.

[0015]

According to the first aspect of the present invention, there are provided (a) digital data input means for inputting digital data to be communicated, and digital data input to the digital data input means for analog voice input. Digital-to-analog data conversion means for converting the analog data converted by the digital / analog data conversion means into pulse data, and pulse code modulation means for performing pulse code modulation on the analog data converted by the digital / analog data conversion means. The slave unit side radio which wirelessly transmits either the converted digital data as modulated digital data or the high-speed digital data which is inputted to the digital data input means and is not passed through the pulse code modulation means as digital data. One or more having transmission means A communication unit that communicates with a slave unit, (b) another base station connected to a plurality of lines, and a base unit-side wireless communication unit that performs wireless communication by digital data with the slave unit-side wireless transmission unit And first digital / analog data conversion means for converting the converted digital data into analog data when the base unit side wireless communication means receives the converted digital data. A second means for converting the high-speed digital data into analog data when the wireless communication means receives the high-speed digital data;
When the digital-to-analog data conversion means and the second digital-to-analog data conversion means can be used together, it is determined that transmission of high-speed digital data is possible. High-speed digital data communication enable / disable determining means for determining that transmission of high-speed digital data is not possible, and a second digital / analog communication means for determining that high-speed digital data transmission is possible. A wireless communication system is constituted by a master unit having transmission control means for selecting data converted by the data conversion means and transmitting the data to the base station via the communication control unit.

That is, the present invention relates to a wireless communication system including a master unit connected to a plurality of lines and one or more slave units for performing wireless communication with the master unit. Has a second digital / analog data conversion means which is smaller than the number of lines. The second digital-to-analog data conversion means, when performing data communication such as facsimile, on the handset side, performs relatively high-speed digital data (passing through the digital-to-analog data conversion means and pulse code modulation means on the handset side) This is used when communicating high-speed digital data). The high-speed digital data communication availability determination means checks whether any of the plurality of lines and the second digital / analog data conversion means can be used together. By transmitting high-speed digital data between the slave and the master, data communication is performed simply and efficiently without re-calling between the slave and the master.

According to a second aspect of the present invention, in the wireless communication system according to the first aspect, the digital-to-analog data conversion means on the slave side and the second digital-analog data conversion means on the base side are modems, The pulse code modulation means on the slave side and the first digital / analog data conversion means on the master side are adaptive differential pulse code modulators.

That is, in the present invention, it is assumed that at least one of the available lines is an analog line, and that the digital data transmitted between the slave unit and the master unit is converted into analog data. I have.

According to a third aspect of the present invention, in the wireless communication system according to the first aspect, the slave unit includes image data reading means for reading image data as data input means, and a printer as image data output means. In addition, facsimile transmission and facsimile reception are performed with the base station via the master unit.

According to the third aspect of the present invention, the slave unit is provided with an image data reading means and a printer for transmitting and receiving an image of a document as data communication. Such a child device may be a stationary type or a portable type. Further, the slave unit does not need to have only such a facsimile communication function, but may have a function for voice communication. Further, it is needless to say that the slave unit may have a function other than the facsimile communication function. For example, a device having a function of transmitting and receiving general image data such as an image obtained from a digital camera or an image created using a computer is also possible.

According to a fourth aspect of the present invention, in the wireless communication system according to the first aspect, when the high-speed digital data communication availability determination means determines that transmission of the high-speed digital data is impossible, the high-speed digital data is transmitted. Transmission control means for receiving the converted digital data of the same data content, converting the digital data into analog data by the first digital / analog data conversion means on the master device side, and transmitting the analog data to the base station. .

In other words, according to the fourth aspect of the present invention, when the slave attempts to transmit high-speed digital data to the master, the master-side high-speed digital data communication availability determination means disables the communication. If it is determined that communication of digital data after conversion is possible,
The master unit automatically switches to this to enable reception of digital data. However, when the amount of digital data to be transmitted is large,
In some cases, it may be advisable to wait until high-speed digital data communication becomes possible and take this form of communication.Therefore, whether to switch to digital data communication after conversion may be left to the setting of the device. Good.

According to a fifth aspect of the present invention, in the wireless communication system according to the first aspect, before transmitting the high-speed digital data to the master unit, the slave unit issues a transmission request to the master unit. The master unit has a digital data communication request unit for high-speed digital data communication, and the master unit responds to the judgment result of the high-speed digital data communication availability judgment unit when transmission of high-speed digital data is requested from any of the slave units by the high-speed digital data request unit It is characterized in that it has a communication enable / disable response means for responding to the slave unit whether or not the requested transmission is possible.

In the fifth aspect of the present invention, a request for transmission of the high-speed digital data is made to the parent device before the child device transmits the high-speed digital data to the parent device. The slave unit can transmit the converted digital data by "assuming voice communication" without making such a request. When a request to transmit high-speed digital data is made in the present invention, the communication-response-response means of the master unit responds to the request by checking whether high-speed digital data communication ("high-speed data communication") is possible. Will be answered.

According to a sixth aspect of the present invention, in the wireless communication system according to the fifth aspect, the master unit determines whether high-speed digital data communication is possible when high-speed digital data transmission is requested by the high-speed digital data communication requesting means. When the determining means determines that the communication of the high-speed digital data is impossible because the second digital / analog data converting means is in use, it is necessary to wait until the use of the second digital / analog data converting means is completed. It is characterized by comprising end time calculating means for calculating the time, and end time notifying means for notifying the slave unit requesting the transmission of the time calculated by the end time calculating means.

According to the sixth aspect of the present invention, in the wireless communication system according to the fifth aspect, since the master unit is using the second digital / analog data conversion means, it is impossible to perform communication of high-speed digital data. When judging,
The time until the use of the used second digital / analog data conversion means is calculated, and the calculated time is notified to the requesting slave unit. Since the master unit can communicate with a plurality of slave units, there is a situation in which the second digital / analog data conversion means provided in the master unit is all in use. In this case, This is for the purpose of making the slave unit that has to wait for a time available for use.

According to the present invention, in the wireless communication system according to the fifth aspect, when receiving the notification of the end time from the end time notifying means, the slave unit waits until the notified end time is reached and performs high-speed operation. Communication type discriminating means for judging whether to transmit with digital data for high-speed use or to judge whether high-speed digital data communication is possible or not immediately after conversion on condition that the line is available. Features.

According to the invention of claim 7, in the invention of claim 6, when the slave unit is notified of the end time from the master unit, the length of time until the high-speed digital data communication becomes possible is reduced. In addition, in consideration of the amount of data to be transmitted, etc., it is determined whether to start communication with digital data immediately after conversion or to wait until the end to perform high-speed digital data communication. . Such a determination can be made by determining a threshold value for the waiting time in advance, determining a threshold value in relation to the amount of data to be transmitted, or in correlation with the waiting time, and comparing the threshold value. Of course, the end time and the data amount may be displayed to the operator, and the operator may input the determination result each time.

According to the eighth aspect of the present invention, in the wireless communication system according to the fifth aspect, the master unit cannot transmit to the predetermined slave unit by the high-speed digital data communication by the communication enable / disable reply means. When the notification is performed, a reservation means is provided for making a reservation for securing transmission by high-speed digital data communication when the transmission becomes possible.

According to the eighth aspect of the present invention, when high-speed digital data communication cannot be performed and the slave unit desires this communication, the master unit can reserve it. The reservation may be realized by requesting the slave unit, or the reservation may be unilaterally performed by the master unit.

According to the ninth aspect of the present invention, in the wireless communication system according to the eighth aspect, the master unit can transmit high-speed digital data from a corresponding slave unit when a reservation is made by the reservation unit. And a communication enable notification unit for notifying the slave unit at the time when the notification is made.

According to the ninth aspect of the present invention, when a reservation for high-speed digital data communication is made and the second digital / analog data conversion means can be used, the master unit becomes the slave unit. This is to notify that transmission is possible. When multiple slave units are making reservations, which slave unit is to be notified of this is determined by giving priority to the oldest one in time, the one with a large amount of data, the one with urgency, etc. Of course, there are various methods for this.

According to the tenth aspect of the present invention, in the wireless communication system according to the sixth aspect, the slave unit is notified of the time until the use of the second digital / analog data conversion means is completed by the end time notification means. In this case, under the condition that the line is free, the base station uses the converted digital data to perform communication with another base station until that time, and then switches to high-speed digital data communication. It is characterized by comprising a composite communication availability determination means for determining availability.

According to the tenth aspect of the present invention, when the second digital / analog data converter is in use and the high-speed digital data communication cannot be performed immediately, the conversion of the non-converted digital data is continued until this becomes possible. Is transmitted, thereby shortening the overall communication.

According to the eleventh aspect of the present invention, in the wireless communication system according to the tenth aspect, the master unit determines that the slave unit performs the complex communication by the complex communication availability determination unit, and when the slave unit notifies the slave unit, it notifies the slave unit. The high-speed digital data communication availability determination means determines whether the high-speed digital data transmission is possible by switching the converted digital data first transmitted from the device to the high-speed digital data. It is characterized by having communication mode switching means for performing the communication at the first break.

According to the eleventh aspect of the present invention, in the first aspect,
In realizing the invention described in paragraph No. 0, in the case of digital data divided in page units, switching from non-converted digital data to high-speed digital data is performed at page breaks, and actual data processing in page units is performed. For convenience.

According to the twelfth aspect of the present invention, (a) digital data input means for inputting digital data to be communicated, and the digital data input to the digital data input means are converted into analog data similar to analog voice input. Digital / analog data conversion means for converting, pulse code modulation means for pulse code modulating the analog data converted by the digital / analog data conversion means, and digital data modulated by the pulse code modulation means A slave-side wireless transmitting means for wirelessly transmitting either digital data after conversion as data or high-speed digital data as digital data which is inputted to the digital data input means and does not pass through the pulse code modulation means; One or more slave units, A communication control unit that is connected to a plurality of lines and performs communication with another base station; a base unit side wireless communication unit that performs wireless communication by digital data and a slave unit side wireless transmission unit; High-speed digital data communication determining means for determining that transmission of high-speed digital data is possible when the device is in a usable state, and determining that transmission of the high-speed digital data is impossible otherwise; Transmission control means for transmitting high-speed digital data transmitted from the slave unit to the base station via the communication control unit in a state where the digital data communication availability determination means has determined that high-speed digital data transmission is possible. The wireless communication system is provided with the master unit.

That is, the invention of claim 12 deals with a case where a line can transmit digital data. Since it is assumed that digital data is transmitted between the slave unit and the master unit, there is no need for the master unit to once convert digital data into analog data. Therefore, there is no circuit for converting digital data into analog data in the present invention.

According to a thirteenth aspect of the present invention, in the wireless communication system according to the twelfth aspect, the digital-to-analog data conversion means on the slave side is a modem, the pulse code modulation means is an adaptive differential pulse code modulator, Further, the communication control unit on the master unit is connected to a digital line.

[0040]

BEST MODE FOR CARRYING OUT THE INVENTION

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

First Embodiment

FIG. 1 shows an outline of a wireless communication system according to a first embodiment of the present invention. In this wireless communication system, master device 201 is connected to first and second lines 20.
2 ₁ , 202 _2, and one or more slave units 203 (only one is shown in the figure).
4 are connected.

Inside the base unit 201, a base unit side wireless communication unit 211 for performing wireless communication with the slave unit 203, and a line control for controlling the first and second lines 202 ₁ and 202 _2. Unit 212 and first and second ADPCMs 213 and 214 and a modem 215 disposed therebetween.
And the first and second ADPCMs 213, 214
Also, a line monitoring unit 216 that monitors the usage state of the first and second lines 202 ₁ and 202 ₂ through the usage state of the modem 215 and a CPU 217 that performs overall control in the parent device 201 are provided. Base unit 201 enables simultaneous communication on a plurality of channels in a time-division manner. Therefore, the line monitoring unit 216 monitors the use state of each channel. Since the modem 215 is relatively expensive, it is used in a number less than the number of lines 202 ₁ , 202 ₂ . In this embodiment, a modem 215 for one line is used.

The slave unit 203 has a facsimile communication function as a function for data communication. For this purpose, the slave unit 203 is sent through a scanner 221 for taking in image data and a first or second line 202 ₁ , 202 _2. And an output unit 222 as a printer for printing out incoming image data. Of course, this handset 20
3 can have a function only as a facsimile transmitter, and in this case, the output unit 2 as a printer
22 can be omitted. The output unit 222 may be a display for visually displaying data, or may be a device for outputting received data to a storage medium such as a floppy disk in some cases. In the latter case, the facsimile data is printed out and displayed offline.

The slave unit 203 includes a modem 223 for modulating and demodulating data and an ADPCM 22 for converting analog data into PCM data and vice versa.
4, a slave unit-side wireless communication unit 225 for controlling communication with the wireless line 204, and a communication permission detection unit 226 for detecting when communication is permitted from the master unit 201.
Is provided. The CPU 227 controls the entire slave unit 203.

The CPU 217 of the master unit 201 and the CPU 227 of the slave unit 203 are both connected to a ROM (read only memory) and a RAM (random access memory) (not shown), and are stored in the ROM. Each device is controlled in accordance with the control program. Each RAM is used to temporarily store various data required for these controls. The master unit 201 and the slave unit 203 each include an operation panel (not shown) in which various keys such as numeric keys and a liquid crystal display panel, a display lamp, and a speaker are arranged.
Allows the operator to input and output data.

FIG. 2 shows the control on the slave unit side when facsimile transmission is performed in the wireless communication system of this embodiment, and FIG. 3 shows the control state on the master unit side at this time. It is a thing. As described above, these control procedures are stored in the ROM of the slave unit 203 or the master unit 201 shown in FIG. 1, and the corresponding CPU 227 or 217 executes these procedures. The state of these controls will be described with reference to FIG.

The CPU 227 of the slave unit 203 monitors the occurrence of a data communication request as a communication request other than the voice communication. For example, the operator operates the scanner 2 of the
When a facsimile transmission key on the operation panel is pressed after setting a document on a document table (not shown) provided in
Step S101; Y), a data communication request occurs.
When a data communication request is generated, the CPU 227 sends the request to the parent device 201 from the child device side wireless communication unit 225 via the wireless line 204 (step S102).

On the other hand, master device 201 waits for reception of a data communication request (step S201 in FIG. 3). Then, when a data communication request is sent from the slave unit 203 (Y), the line monitoring unit 216 detects whether the modem 215 is used and also detects the idle state of the first and second lines 202 ₁ , 202 _2. Perform (Step S202). And
As a result, if data communication is possible irrespective of the type (step S203; Y), a communication permission notification is sent to the requesting slave unit 203 (step S204). Here, the fact that data communication is possible regardless of the type means that there is an empty channel in the first or second line 202 ₁ , 202 ₂ and the modem 215 is not in use and digital data communication And the case where the first or second line 202 ₁ , 202 ₂ has an empty channel and the modem 215 is in use and “disregard voice communication” is possible.

On the other hand, if the modem 215 is in use and neither of the first and second lines 202 ₁ , 202 ₂ has an empty channel (N), On the other hand, a non-permission notice indicating that communication is not possible is transmitted (step S205).

The slave unit 203 waits for such a communication permission notice or a non-permission notice to be sent from the master unit 201 (step S103 in FIG. 2). And
If any notification is received (Y), it is determined whether or not the notification is a communication permission notification. If not, the communication is not permitted (step S104; N). The communication is cut off (step S105), and the process ends. In this case, the process is restarted from step S101 when a predetermined time has elapsed.

On the other hand, when a communication permission notification is received from the base unit 201 (step S104; Y), the notification is transmitted from the base unit 201 to another base station using the modem 215; That is, it is determined whether or not it indicates that high-speed digital data can be transmitted (step S106). Modem 21 of parent device
If it is determined that No. 5 can be used (Y), communication using high-speed digital data is performed (step S10).
7). In this case, the image data obtained from the scanner 221 is sent to the slave-side wireless communication unit 225 without passing through the modem 223, where it is modulated and wirelessly sent to the master unit 201 side. In base unit 201, base unit-side wireless communication unit 21
1 demodulates the transmitted image data, and outputs
Modulates this into analog data. Line control unit 2
12 modulates this to provide first and second lines 202 ₁ ,
It will be transmitted to the line of the person connected to the modem 215 of the 202 _2.

As described above, when data communication using high-speed digital data is performed, the ADPCM 224 and the modem 223 are not used as described above. Therefore, data can be sent to the base unit 201 at high speed without a data error. Master unit 201
This is transmitted at high speed to a base station (not shown). This transmission speed depends on the reading capability of the scanner 221 and the modem 2
15. Line control unit 212 and analog line 2 to be used
02 ₁ , 202 ₂ .

On the other hand, when the communication permission notification is received and the modem 215 is in use (step S10).
6; N), "deemed voice communication" is performed (step S108). In this case, the scanner 221
The image data read from the
The data is sent to the slave unit-side wireless communication unit 225 via the PCM 224, and demodulated by the wireless communication unit 211 in the master unit 201. The demodulated image data is the first or second ADP
The data is converted into analog data by the CMs 213 and 214, modulated by the line control unit 212, and transmitted to one of the first and second lines 202 ₁ and 202 ₂ .

FIG. 4 shows a state of control when the mode is switched to "deemed voice communication" in step S108 of FIG. In this “deemed voice communication”, the child device 20
Since the modem 223 on the third side is used, first, the modem 2
The settings such as initialization of 23 are made (step S301).
Then, a dial call request is sent to the destination of the facsimile communication (step S302). Thereafter, when there is a reply that the line has been connected via the master unit 201 (step S303; Y), the scanner 221 is instructed to start reading the image data, and the image data is read. 225 (step S304). The transmission of the image data is performed until the reading by the scanner 221 is completed (step S305). When the reading of the image data is completed (Step S305; Y), the wireless communication is cut off (Step S306), and the data communication ends (End).

Second Embodiment

FIG. 5 shows an outline of the configuration of a wireless communication system according to the second embodiment of the present invention. In this wireless communication system, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Master device 301 has first and second lines 202 ₁ , 20 ₁
2 ₂ and are connected, also one or more of the slave unit 303
(Only one is shown in the figure.)

Inside the base unit 301, a base unit-side wireless communication unit 311 for performing wireless communication with the slave unit 303, and a line control for controlling the first and second lines 202 ₁ and 202 _2. Unit 212 and first and second ADPCMs 213 and 214 and a modem 215 disposed therebetween.
And the first and second ADPCMs 213, 214
A line monitoring unit 216 for monitoring the use state of the first and second lines 202 ₁ , 202 ₂ through the use state of the modem 215; a CPU 217 for overall control in the parent device 301; And a communication time management unit 331 for performing the following. The master unit 301 enables simultaneous communication on a plurality of channels in a time-division manner.

The slave unit 303 has a facsimile communication function as a function for data communication. To this end, a scanner 221 for taking in image data and image data output from the scanner 221 are temporarily stored. The memory 341 and the first or second line 202 ₁ , 202
_And an output unit 222 as a printer for printing out image data sent through the printer 2. The slave unit 303 includes a modem 223 for modulating and demodulating data, an ADPCM 224 for converting analog data into PCM data and vice versa, and a slave unit for controlling communication with the wireless line 204. Side wireless communication unit 325, a communication permission detection unit 226 that detects when a communication permission is issued from the master device 301, and calculates a transmission data amount from the amount of image data stored in the memory 341. Transmission data notification unit 3 that notifies parent device 301
42, and a communication end time detecting unit 343 for detecting when the communication end time is transmitted from the master unit 301 when transmitting image data. CPU 227
Controls the entire slave unit 303.

The CPU 217 of the master unit 301 and the CPU 227 of the slave unit 303 are both connected to a ROM (read only memory) and a RAM (random access memory) (not shown), and are stored in the ROM. Each device is controlled in accordance with the control program. Each RAM is used to temporarily store various data required for these controls. The master unit 301 and the slave unit 303 each include an operation panel (not shown) in which various keys such as a numeric keypad, a liquid crystal display panel, a display lamp, and a speaker are arranged.
Allows the operator to input and output data.

FIG. 6 shows a main part of the control of the slave unit in the second embodiment. This will be described with reference to FIG. Since the slave unit 303 has the memory 341,
After compressing the transmission target image data read from the scanner 221, all the image data is stored in the memory 341 (step S401). The CPU 227 calculates the total amount of transmission data based on the storage amount of the memory 341 (Step S4).
02). Thereafter, the slave unit 303 transmits a data communication request by facsimile to the master unit 301 (step S).
403). Then, it waits for a response to this from master device 301 (step S404).

FIG. 7 shows the flow of processing on the master unit side when the master unit receives a data communication request. Base unit 3
01 receives a data communication request from the slave unit 303 (step S501; Y), and if the modem 215 is in use and “high-speed data communication” using high-speed digital data is not possible (step S502; Y), 1st or 2nd
It is checked whether the lines 202 ₁ and 202 ₂ are unused, and if not, it is determined that “deemed voice communication” is possible (step S503). In this case, "high-speed data communication" is not possible and "deemed voice communication"
In addition, the communication end time is read out from the memory described later, and the communication end time is notified (step S504).

On the other hand, if it is determined that “deemed voice communication” is also impossible, the master 301
No. 3 is notified (step S50).
5). If it is determined in step S502 that "high-speed data communication" is possible (N), a notification that "high-speed data communication" is possible is sent to slave unit 303 (step S506).

Returning to FIG. 6, the description will be continued. When a notification that “high-speed data communication” is possible is received from the parent device 301 (step S405; Y), the child device 303 notifies the amount of image data to be transmitted by itself (step S4).
06). Then, the modem 215 on the master unit 301 is set (step S407), and "high-speed data communication" using high-speed digital data is performed (step S4).
08).

On the other hand, “high-speed data communication”
Is not possible, and a notification that “deemed voice communication” is possible is received (step S409; Y), the modem 215
Is being used by another slave unit, and the end time of use of the modem 215 by the slave unit sent at this time is compared with the current time to determine whether it is within the allowable time range. Is determined (step S41).
0). The time threshold value for this is set as a default value in the slave unit 303, and this value can be changed by operating the operation panel described above by an operator. If the end time is longer than this threshold, it is useless to wait for the modem 215 to become empty.
Therefore, in this case (Y), data communication is performed by "assumed voice communication" (step S411). On the other hand, when the modem 215 becomes available in a relatively short time, for example, 300 seconds, the transition to the “deemed voice communication” is rather disadvantageous in time.

Therefore, in the latter case (step S41)
0; N), the start of wireless communication is abandoned and the communication is terminated (step S412), and a request for data communication is transmitted to the master unit 301 again after the communication end time. In the latter case, it goes without saying that the process can be restarted from step S405 in FIG. 6 and the reading operation of the image data by the scanner 221 can be omitted. If the "deemed voice communication" is started in step S411, the modem 223 on the slave unit side is set, and a dial call request is issued to the base station on the partner side.

FIG. 8 shows a part of a process for managing the communication end time on the master unit side. As described above, when “high-speed data communication” is enabled (step S405; Y), the slave unit 303 notifies the transmission data amount (step S406). The parent device 301 calculates the communication processing time by the modem 215 from the transmission data amount and the communication speed for the corresponding _{one of} the lines 202 ₁ and 202 ₂ (step S601). For example,
The total data amount after being read and compressed by the scanner 221 is 500,000 bytes, and the communication speed is 14,000.
If it is 0 bits / second, the communication processing time is 278 seconds. The CPU 217 calculates a communication end time when the start of the communication of the image data for the communication processing time obtained in this manner is set to a predetermined communication start time, and stores this in a RAM (not shown) in the base unit 301 ( Step S602). Then, as described above, the slave device 303 that cannot use the modem 215 is notified of the time or time when the communication ends. The data on the communication end time written in the RAM is erased by a control operation (not shown) when the data becomes older than the current time.

Third Embodiment

FIG. 9 shows an outline of the configuration of a wireless communication system according to the third embodiment of the present invention. In this wireless communication system, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Base unit 401 is connected to first and second lines 202 ₁ , 20 ₁
2 ₂ and are connected, also one or more of the slave unit 403
(Only one is shown in the figure.)

Inside the base unit 401, a base unit side wireless communication unit 211 for performing wireless communication with the slave unit 403, and a line control unit for controlling the first and second lines 202 ₁ and 202 _2. Unit 212 and first and second ADPCMs 213 and 214 and a modem 215 disposed therebetween.
And the first and second ADPCMs 213, 214
A line monitoring unit 216 for monitoring the use state of the first and second lines 202 ₁ , 202 _{2 through} the use state of the modem 215, a CPU 217 for performing overall control in the base unit 401, and use of the modem 215. And a modem reservation unit 431 for making reservations. Base unit 401 enables simultaneous communication on a plurality of channels in a time-division manner.

The slave unit 403 has a facsimile communication function as a data communication function. For this purpose, the slave unit 403 is sent through a scanner 221 for taking in image data and the first or second line 202 ₁ , 202 _2. And an output unit 222 as a printer for printing out incoming image data. The slave unit 403 includes a modem 223 for modulating and demodulating data, an ADPCM 224 for converting analog data into PCM data and vice versa, and a slave unit for controlling communication with the wireless line 204. Side wireless communication unit 425 and base unit 401
A communication permission detecting section 226 for detecting when a communication permission is issued from the side, and a high-speed data communication reservation notifying section 441 for reserving the use when the modem 215 is in use.
Is provided. The CPU 227 controls the entire slave unit 403.

The CPU 217 of the master unit 401 and the CPU 227 of the slave unit 403 are both connected to a ROM (read only memory) and a RAM (random access memory), not shown, and are stored in the ROM. Each device is controlled in accordance with the control program. Each RAM is used to temporarily store various data required for these controls. The master unit 401 and the slave unit 403 each include an operation panel (not shown) in which various keys such as a numeric keypad, a liquid crystal display panel, a display lamp, and a speaker are arranged.
Allows the operator to input and output data.

FIG. 10 shows a main part of control on the slave unit side in the third embodiment. This will be described with reference to FIG. The slave unit 403 sends a request for data communication to the master unit 401.
, It is monitored whether or not a notification that “high-speed data communication” is impossible is received (step S7).
01). If a notification is received that the modem 215 is in use and “high-speed data communication” is not possible (Y), the slave 40
It is checked using the data in the RAM whether or not only the setting of 3 is "high-speed data communication" (step S702). In the case where “deemed voice communication” can be performed, the procedure described above with reference to FIG. 6 and the like is followed.

If only "high-speed data communication" is scheduled (step S702; Y), the CPU 227 reads the ID of the slave unit 403 set by the ROM or the dip switch (not shown) (step S703). ). Then, a high-speed data communication reservation notification is transmitted to master device 401 together with this ID (step S704). Then, the wireless line 204 is disconnected (step S705).

FIG. 11 shows the control on the master unit side when the slave unit makes a reservation for "high-speed data communication". When the slave unit 403 makes a reservation for “high-speed data communication” described in step S704 (step S801;
Y), master device 401 registers the reserved time and the ID in the reserved memory which is a predetermined area in the RAM (step S).
802). Instead of such reserved memory, FIFO
It is also possible to use (first in first out) memory.
When the registration operation is completed, master device 401 disconnects wireless line 204 (step S803).

FIG. 12 shows the contents of a reservation process periodically performed by the master unit. Master device 401 periodically checks whether modem 215 is in use (step S901). When the use of the modem 215 has been completed (N), the reservation memory is checked to see if the reservation has been registered (step S90).
2). If the reservation has been registered (Y), the earliest reservation, that is, the oldest reservation in time, is read from the reservation memory (step S903). Then, the corresponding slave unit 403 is determined from the ID, and the slave unit 403 is notified that “high-speed data communication” is possible (step S).
904). Then, the modem 215 is sent from the slave unit 403 side.
Is set, the reservation is deleted from the reservation memory (step S905).

When the slave unit 403 is notified that "high-speed data communication" is possible, the slave unit may be out of order, may be turned off, or may be in an area where communication is not possible. In such a case, if another reservation exists, the other reservation may be given priority. Further, when the base unit 401 registers the reservation, the time when the use of the modem 215 ends is predicted as described with reference to FIG. 8, and the time is notified to each of the slave units 403. The probability that these slaves 403 secure a state in which communication can be performed near the time when a notification is received from the master 401 increases. Furthermore, if the master unit 401 notifies the corresponding slave unit 403 in advance of such a time in advance, the master unit 401 does not always need to notify the slave unit 403 of the notification described in step S904.

FIG. 13 shows the contents of the control operation of the slave unit when the notification of step S904 is sent from the master unit. The slave unit 403 receives the notification that “high-speed data communication” is possible (step S1001;
Y), a command for setting the modem 215 on the master unit 401 is sent to the master unit 401 (step S1).
002), a dialing request is made to the receiving party (step S1003). When the call is established, "high-speed data communication" is started (step S10).
04).

Fourth Embodiment

FIG. 14 shows an outline of the configuration of a wireless communication system according to the fourth embodiment of the present invention. In this wireless communication system, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Master device 501 includes first and second lines 202 ₁ , 20 ₁
2 ₂ and are connected, also one or more of the slave unit 503
(Only one is shown in the figure.)

Inside the base unit 501, a base unit side wireless communication unit 511 for performing wireless communication with the handset unit 503, and a line control for controlling the first and second lines 202 ₁ and 202 _2. Unit 212 and first and second ADPCMs 213 and 214 and a modem 215 disposed therebetween.
And the first and second ADPCMs 213, 214
A line monitoring unit 216 for monitoring the use state of the first and second lines 202 ₁ , 202 ₂ through the use state of the modem 215, a CPU 217 for overall control in the parent device 501, An information detector 531 for detecting the timing of switching between high-speed digital data and converted digital data sent from an information channel of a PHS (Personal Handy Phone System) to be used, and detection of the information detector 531 Modem setting detector 532 for setting modem 215 based on the result
It has. The present embodiment is effective when switching “deemed voice communication” to “high-speed data communication” in the middle of communication. Also in the present embodiment, the base unit 501 enables simultaneous communication on a plurality of channels in a time-division manner.

The slave unit 503 has a facsimile communication function as a function for data communication. For this purpose, the slave unit 503 is sent through a scanner 221 for taking in image data and a first or second line 202 ₁ , 202 _2. And an output unit 222 as a printer for printing out incoming image data. The slave unit 503 includes a modem 223 for modulating and demodulating data, an ADPCM 224 for converting analog data into PCM data and vice versa, and a slave unit for controlling communication with the wireless line 204. Side wireless communication section 525, an information detection section 541 for performing the above-described information channel detection operation, and a modem release detection section 54 for detecting release of the modem 215 from data of the information channel detected by the information detection section 541.
2 are provided. The CPU 227 controls the entire slave unit 503.

The CPU 217 of the master unit 501 and the CPU 227 of the slave unit 503 are both connected to a ROM (read only memory) and a RAM (random access memory) (not shown), and are stored in the ROM. Each device is controlled in accordance with the control program. Each RAM is used to temporarily store various data required for these controls. The master unit 501 and the slave unit 503 each include an operation panel (not shown) in which various keys such as a numeric keypad, a liquid crystal display panel, a display lamp, and a speaker are arranged.
Allows the operator to input and output data.

FIG. 15 shows the control when the modem of the master unit is opened in the fourth embodiment. Master device 50
1 periodically checks whether the modem 215 is released (step S1101). When the use of the modem 215 is completed and released (Y), the CPU 217 checks whether or not the “assumed voice communication” is currently being performed (step S102). “Deemed voice communication”
Is not performed (N), the process is terminated (end). In contrast, “deemed voice communication”
(Y), the "deemed voice communication"
Is notified that the "high-speed data communication" is enabled by the information data to the earliest slave unit 503 (step S1103).

In the PHS, an information channel (SACCH) is provided in addition to a data transfer channel. This is
1 out of 240 bits in one time slot transfer
Six bits are reserved. Transmission of voice data is
It occupies 160 bits out of 40 bits. In the present embodiment, communication between the parent device 501 and the child device 503 is enabled by incorporating a data communication enable notification into this information channel.

FIG. 16 shows the contents of the control on the slave unit side when the data communication permission notice is sent from the master unit. The information detection unit 541 of the slave unit 503 sends the information data to the modem release detection unit 542,
2 detects the data communication enable notification when it is sent (step S1201; Y). When the data communication enable notification is detected, the CPU 227 checks whether or not the slave unit 503 is set in advance to be switched to “high-speed data communication” in this case (step S1).
202). Such setting is realized by an operator or a serviceman operating the operation panel described above.
If the switching to “high-speed data communication” is not set, the process ends without performing any new control (END). In this case, "deemed voice communication" will be continued.

On the other hand, if the handset 503 is set to the mode for switching to “high-speed data communication” (step S1202; Y), the handset 503
A command instructing the setting to use No. 15 is transmitted to the master device 501 as information data (step S120).
3). In the present embodiment, the switching from "deemed voice communication" to "high-speed data communication" is performed at a page break. Therefore, the CPU 217 thereafter monitors the time point when the page ends (step S1204).
Then, at that time (Y), an EOM (end of message) is transmitted (step S1205). EOM
Is the first or second ADPCM 213 of the base unit 501,
The first or second line 202 ₁ , 202 via 214
₂ and is notified to the receiving base station.

In this state, the slave unit 503 subsequently uses the information data to switch to "high-speed data communication" based on the information data.
(Step S1206). As a result, the master device 501 changes from “deemed voice communication” to “high-speed data communication”.
Can be switched to Thereafter, the modem 21 of the base unit 501
5, a communication negotiation is performed between the slave unit 503 and the receiving base station (step S120).
7) Then, "high-speed data communication" using the modem 215 is performed (step S1208).

FIG. 17 shows a state of control on the master unit side when information data for modem setting is transmitted in step S1203. When information data for modem setting is transmitted from the slave unit 503 (step S13).
01; Y), the modem setting detector 532 sets the modem 215 (step S1302). After this, the child device 5
When the information data of the instruction to switch to the “high-speed data communication” described in step S1206 is sent from step 03 (step S1303; Y), the CPU 217 uses the first or second ADPCM 213, 214 at this timing to determine Switching from "voice communication" to "high-speed data communication" using the modem 215 is performed (step S1304). Switching of communication is performed at a boundary between pages. Thereafter, the communication negotiation described in step S1207 is performed (step S130).
5) "High-speed data communication" by the modem 215 is started (step S1306).

First Modified Example

In the first to fourth embodiments described above, the description has been made on the premise that a general public line is connected to the line control unit of the master unit. Of course, the present invention
The network may be connected to a digital line such as a DN (Integrated Services Digital Network), or may be connected to the entire digital line.

FIG. 18 shows the structure of a master unit as a first modification of the present invention. Master unit 601 in FIG.
Is a wireless communication unit 602, an ADPCM 603, a memory 60
4. Modem 605, line controller 606 and CPU 60
7 is provided. The line control unit 606 is connected to a line termination device 612 via a terminal adapter 611, and a plurality of (first and second in the figure) ISDN lines 613 ₁ and 613 ₂ are connected to the line termination device 612. I have. Such a master unit communicates high-speed digital data or non-converted digital data between slave units (not shown) through the wireless communication unit 602. When such digital data is sent from the slave unit, the data is once converted into analog data by the ADPCM 603 or the modem 605, and finally transmitted as digital data from the line terminating device 612.

Second Modified Example

FIG. 19 shows the structure of a master unit according to a second modification of the present invention. The same parts as those in FIG. 18 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. In this second modification, there is no ADPCM 603 or modem 605 for conversion to analog data shown in FIG.
Is arranged. The ISDN transceiver 702 is connected to the first and second ISDN lines 613 ₁ and 613 ₂ via a line terminating device 612. In this modification, digital data transmitted from a slave unit (not shown) is digitally modulated by an ISDN transceiver 702, and the first or second I / O is transmitted via a line termination device 612.
The data is transmitted to the SDN lines 613 ₁ and 613 ₂ .

[0096]

As described in detail above, according to the first to eleventh aspects of the present invention, a relatively expensive second digital-to-analog data conversion means is not required on the master unit side. Can be simplified, the cost can be reduced, and the reliability of the apparatus can be improved. In addition, since either “deemed voice communication” or “high-speed data communication” can be selected depending on the type of data communication, overall communication efficiency can be improved.

According to the invention of claim 6, when the apparatus determines that communication of high-speed digital data is impossible because the second digital / analog data conversion means is in use, the apparatus is used. The time until the end of use of the second digital / analog data conversion means is calculated, and the calculated time is notified to the requesting slave unit, so that the slave unit needlessly repeat the communication request. There is no.

Further, in the invention according to claim 7, when the slave unit receives the notification of the end time from the master unit, the slave unit attempts to transmit the digital signal for the high-speed digital data communication. In consideration of the amount of data, etc., it is now possible to determine whether to start communication with digital data immediately after conversion or to wait until the end to perform high-speed digital data communication. It can take the form.

According to the ninth aspect of the present invention, when the reservation of the high-speed digital data communication is made and the second digital / analog data conversion means can be used, the master unit becomes the slave unit. Since the transmission is notified, it is not necessary for the slave unit to manage time, and the master unit can perform overall time management so that communication between each slave unit can be performed. It is possible to take flexible measures such as earlier or later notification of the start of communication depending on the degree of importance or the like.

Further, according to the tenth aspect of the present invention, when the second digital / analog data conversion means is in use and high-speed digital data communication cannot be performed immediately, the conversion of the non-converted digital data is continued until this becomes possible. , The overall communication can be shortened and the efficiency of using the equipment on the master device side can be improved.

In the twelfth aspect of the present invention, since the master unit is connected to a digital line, when digital data is sent from a slave unit, it is not necessary to convert the digital data into analog data. Has the advantage of simplification.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an outline of a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a state of control when a slave performs facsimile transmission in the first embodiment.

FIG. 3 is a flowchart showing a state of control on a master device side in the first embodiment.

FIG. 4 is a flowchart showing a state of control when switching to “deemed voice communication” is performed in step S108 of FIG. 2;

FIG. 5 is a block diagram illustrating an outline of a wireless communication system according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing a main part of control on the slave unit side in the second embodiment.

FIG. 7 is a flowchart showing processing on the master unit side when the master unit receives a data communication request in the second embodiment.

FIG. 8 is a flowchart illustrating a part of a process for managing a communication end time on the master device side in the second embodiment.

FIG. 9 is a block diagram illustrating an outline of a wireless communication system according to a third embodiment of the present invention.

FIG. 10 is a flowchart showing a main part of control on the slave unit side in the third embodiment.

FIG. 11 illustrates a case where the slave unit is “high-speed data communication”
6 is a flowchart showing a state of control on the master device side when a reservation is made.

FIG. 12 is a flowchart showing the contents of a reservation process periodically performed by a parent device in the third embodiment.

FIG. 13 is a flowchart showing the contents of the control operation of the slave unit when the notification of step S904 is sent from the master unit.

FIG. 14 is a block diagram illustrating an outline of a configuration of a wireless communication system according to a fourth embodiment of the present invention.

FIG. 15 is a flowchart showing control when the master unit opens the modem in the fourth embodiment.

FIG. 16 is a flowchart showing the contents of control on the slave unit side when a data communication enable notification is sent from the master unit in the fourth embodiment.

FIG. 17 is a flowchart showing a state of control on the parent device side when information data for modem setting is transmitted in step S1203.

FIG. 18 is a block diagram showing a configuration of a master unit of the wireless communication system according to the first modification of the present invention.

FIG. 19 is a block diagram showing a configuration of a master unit of a wireless communication system according to a second modified example of the present invention.

FIG. 20 is a block diagram illustrating an outline of a conventionally proposed wireless communication system that performs “deemed voice communication”.

FIG. 21 is a block diagram showing an outline of a conventionally proposed wireless communication system for performing digital data communication.

[Explanation of symbols]

201, 301, 401, 501, 601, 701 ... master unit, 202 ... line, 203, 303, 403, 503 ...
Slave unit, 204: wireless line, 211, 511: base unit side wireless communication unit, 212, 606: line control unit, 213, 21
4, 224, 603 ... ADPCM, 215, 223, 6
05: Modem, 216: Line monitoring unit, 217, 227 ...
CPU, 221 scanner, 222 output unit, 225
512: slave unit side wireless communication unit, 226: communication permission detection unit,
331: Communication time management unit, 342: Transmission data both notification unit, 343: Communication end time detection unit, 431: Modem reservation unit, 444: High-speed data communication reservation notification unit, 531, 54
1 Information detecting section, 532 Modem setting detecting section, 542
Modem release detector, 611 ... terminal adapter, 61
2, 703: Line termination device, 702: ISDN transceiver

──────────────────────────────────────────────────続 き Continuing from the front page (72) Ryo Matsuura, Inventor 3-7-1, Funai, Iwatsuki-shi, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office (72) Inventor Gen Okabe 3-7-1, Funai, Iwatsuki-shi, Saitama Prefecture Fuji Xerox Co., Ltd. Iwatsuki Office (56) References JP-A-8-107461 (JP, A) JP-A-7-203069 (JP, A) JP-A-7-203068 (JP, A) JP-A-7-207 203066 (JP, A) JP-A-7-203065 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 11/00-11/10 H04N 1/32 H04Q 7/38 H04M 1/725

Claims (13)

(57) [Claims] 1. Digital data input means for inputting digital data to be communicated, and digital / analog data conversion for converting the digital data input to the digital data input means into analog data similar to analog voice input. Means and this digital
Pulse code modulation means for pulse code modulation of the analog data converted by the analog data conversion means,
Either converted digital data as digital data modulated by the pulse code modulation means or high-speed digital data as digital data which is input to the digital data input means and does not pass through the pulse code modulation means. One or a plurality of slave units each including a slave-side wireless transmission unit for wirelessly transmitting, a communication control unit connected to a plurality of lines and communicating with another base station; A base unit-side wireless communication unit for performing wireless communication with the transmission unit by using digital data; and a first digital / analog data converter for converting the converted digital data into analog data when the base unit-side wireless communication unit receives the converted digital data. Means and at least one number less than the number of lines, wherein the base station side wireless communication means A second digital converter for converting the received data into analog data;
When the analog data conversion means and any one of the plurality of lines and the second digital / analog data conversion means are in a usable state, it is determined that the high-speed digital data can be transmitted. High-speed digital data communication enable / disable determining means for determining that transmission of high-speed digital data is not possible; A wireless communication system comprising: a base unit having transmission control means for selecting data converted by analog data conversion means and transmitting the data to the base station via the communication control unit. 2. The digital / analog data conversion means on the slave unit side and the second digital / analog data conversion means on the master unit side are modems, and the pulse code modulation means on the slave unit side and the master unit side The first digital
2. The wireless communication system according to claim 1, wherein the analog data conversion means is an adaptive differential pulse code modulator. 3. The slave unit includes image data reading means for reading image data as data input means, and a printer as image data output means, and communicates with the base station via the master unit. The wireless communication system according to claim 1, wherein facsimile transmission and facsimile reception are performed. 4. When the high-speed digital data communication availability judging means judges that transmission of the high-speed digital data is impossible, the high-speed digital data receives the converted digital data having the same data content as the high-speed digital data. 2. A transmission control means for converting analog data into analog data by the first digital / analog data conversion means on the master device side and transmitting the analog data to the base station.
A wireless communication system as described. 5. The high-speed digital data communication requesting means for making a request for transmission of the high-speed digital data to the master unit before transmitting the high-speed digital data to the master unit, wherein the master unit is When transmission of high-speed digital data is requested from any of the slave units by the high-speed digital data communication requesting means, whether or not the requested transmission is possible in accordance with the result of the judgment by the high-speed digital data communication availability judgment means 2. The wireless communication system according to claim 1, further comprising a communication permission / rejection response means for responding to the slave. 6. The high-speed digital data communication requesting means requests the transmission of high-speed digital data, and the high-speed digital data communication availability determining means determines whether or not the high-speed digital data communication is possible. When it is determined that communication of high-speed digital data is impossible due to the use of the means, the end time calculating means for calculating the time until the use of the second digital / analog data converting means is completed; 6. The wireless communication system according to claim 5, further comprising: an end time notifying unit that notifies the slave unit that has requested the transmission of the time calculated by the end time calculating unit. 7. The slave unit, upon receiving the notification of the end time from the end time notifying means, waits until the notified end time is reached and transmits the digital data for high speed or the digital data for high speed. 6. The wireless communication system according to claim 5, further comprising communication type determination means for determining whether communication is to be performed immediately with the converted digital data on condition that the line is usable. system. 8. When the master unit notifies the predetermined slave unit that the transmission by the high-speed digital data communication is impossible by the communication permission / rejection reply unit, the transmission by the high-speed digital data communication is performed. 6. The wireless communication system according to claim 5, further comprising a reservation unit that makes a reservation for securing the time when the time becomes available. 9. The communication enable notification means for notifying the slave unit when high-speed digital data can be transmitted from the slave unit when a reservation is made by the reservation unit. The wireless communication system according to claim 8, comprising: 10. The slave unit, when notified by the end time notifying unit of the time until the use of the second digital / analog data converting unit is completed, on the condition that the line is free. Composite communication availability determination means for allowing the master unit to perform communication with the other base station using the converted digital data until time, and then determining whether or not composite communication is to be switched to communication using the high-speed digital data. The wireless communication system according to claim 6, comprising: 11. The master unit determines that the slave unit performs the complex communication by the complex communication availability determination means and notifies the slave unit of the fact that the slave unit performs the complex communication based on the converted digital data transmitted first from the slave unit. Communication mode switching means for switching to the high-speed digital data at the first break of a page constituting digital data after the high-speed digital data communication availability determination means has determined that transmission of the high-speed digital data is possible. The wireless communication system according to claim 10, comprising: 12. Digital data input means for inputting digital data to be communicated, and digital / analog data conversion for converting the digital data input to the digital data input means into analog data similar to analog voice input. Means, pulse code modulation means for pulse code modulating the analog data converted by the digital / analog data conversion means, and converted digital data as digital data modulated by the pulse code modulation means or One or a plurality of slave units each including: a slave unit-side wireless transmission unit that wirelessly transmits one of high-speed digital data as digital data that is input to the digital data input unit and does not pass through the pulse code modulation unit; , Other connected to multiple lines A communication control unit that communicates with a base station; a base unit-side wireless communication unit that performs wireless communication with the slave unit-side wireless transmission unit and digital data; and a state in which one of the plurality of lines is usable. High-speed digital data communication enable / disable determining means for determining that transmission of the high-speed digital data is possible at one time and determining that transmission of the high-speed digital data is impossible otherwise; and Transmission control means for transmitting the high-speed digital data transmitted from the slave unit to the base station via the communication control unit in a state where it is determined that transmission of the high-speed digital data is possible. A wireless communication system comprising: 13. The digital / analog data converter on the slave side is a modem, the pulse code modulator is an adaptive differential pulse code modulator, and the communication controller on the master side is connected to a digital line. The wireless communication system according to claim 12, wherein the wireless communication system is connected.