JP2003174667A - Wireless communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication apparatus that can surely establish a wireless communication. <P>SOLUTION: When detecting a noise as shown in Figure 3 (c), since a master unit immediately carries out detection of other control channel not detected yet by taking precedence over detection of a speech channel, even if both the control channels are detected and reception of data is respectively carried out, the master unit can complete a series of the processes as above within a prescribed time (within one second). On the other hand, when detecting a noise, since a slave unit does not shift to a standby state but carries out the detection of the other control channel not detected yet, even if both the control channels are detected and reception of data is respectively carried out, the slave unit can complete a series of the processes as above within a prescribed time (4 seconds). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device that establishes wireless communication by tuning to any of a plurality of control channels, and more particularly to a wireless communication device that can reliably establish wireless communication. is there.

[0002]

2. Description of the Related Art At present, a large number of telephones, such as a parent-child telephone (including a facsimile machine), for communicating between a parent device and a child device have been put into practical use. These parent-child phones are provided with a base unit connected to an outside line and a handset unit connected to the base unit via an extension line, and the handset unit is configured to talk to an outside line via the base unit. . The master unit and the slave unit perform data communication by extension, but in recent years, the data communication between the master unit and the slave unit is often performed wirelessly. In the wireless communication executed between the master unit and the slave unit, first, a communication link is formed by the control channel (a wireless link is established). When the wireless link is established, the master unit and the slave unit transit to a call channel, and data communication such as a call is performed wirelessly by this call channel.

Here, if a wireless link is not established on the control channel, the parent device and the child device cannot perform wireless communication. For this reason, the control channel used between the master unit and the slave unit is set to one channel, and the wireless link is established by synchronizing with the only channel and establishing the wireless link.

[0004]

However, if an electric field (a source of noise) of the same channel as the control channel used exists near the parent and child telephones, it becomes difficult to use the control channel. That is, in the case of the only control channel, if the control channel becomes unusable, there is a problem that it becomes impossible to establish a wireless link between the master unit and the slave unit.

On the other hand, if the master unit and the slave unit are configured so that a wireless link can be established using a plurality of control channels, even if one control channel becomes unavailable, another control channel is used. A wireless link can be established between the master unit and the slave unit. Here, when using multiple control channels, prior to establishing a wireless link, first, which control channel is the communication partner device attempting to communicate with (which control channel is outputting the radio wave)? Need to detect. When detecting a plurality of channels, generally, a method of sequentially detecting each channel without any unevenness is used. Therefore, during detection of one control channel, radio waves of other control channels cannot be detected. In other words, if the partner device outputs a radio wave on a control channel other than the control channel being detected, that radio wave will not be detected. Therefore, when a plurality of control channels are used, there is a problem that the establishment of the wireless link tends to be uncertain.

[0006] Further, in the radio wave output on the control channel,
In many cases, there is a restriction that the radio wave can be output only for a fixed time, that is, the radio wave output is limited to pulse (intermittent) operation. In such a case, if the detection timing is deviated, the output radio wave from the other party's device cannot be captured, and as a result, the control channel cannot be detected even though the radio wave is actually output on the legal control channel. There was a problem.

The present invention has been made in order to solve the above-mentioned problems, and relates to a wireless communication device capable of reliably establishing wireless communication.

[0008]

In order to achieve this object, a wireless communication apparatus according to claim 1 is a control channel detecting means for detecting a control channel for forming a communication link, and the control channel detecting means. Detecting a communication link forming means for forming a communication link in tune with any of a plurality of control channels detected by the communication channel and a communication channel for executing communication such as a communication with the communication link formed by the communication link forming means. A first wireless communication device that includes a call channel detecting means and performs wireless communication with a partner device is provided, and the first wireless communication device alternately operates the control channel detecting means and the call channel detecting means. In addition, in the detection of the control channel, the alternating detection in which the detection of the control channel of 1 is executed at the detection timing of 1 Means and the control channel detecting means operated by the alternate detecting means, when one control channel is detected, priority is given to the detection of the remaining undetected control channels prior to the detection of the communication channel. And a detection means.

According to the wireless communication device of the first aspect, in the first wireless communication device, the alternate detection means is used.
The control channel detecting means and the call channel detecting means are alternately operated to detect the control channel and the call channel, respectively. Here, by the control channel detecting means operated by the alternate detecting means,
When the control channel is detected, the control channel priority detecting means executes the detection of the remaining undetected control channels prior to the detection of the communication channel. Then, the communication link forming means forms a communication link with the partner device in tune with the detected control channel, and the call is made on the channel for which the communication channel detecting means determines that there is a vacancy.

The wireless communication device according to claim 2 is the wireless communication device according to claim 1.
In the wireless communication device described above, the first wireless communication device includes first receiving means for receiving data transmitted on the control channel when the control channel is detected by the control channel detecting means, and first receiving means thereof. And priority execution means for causing the control channel priority detection means to be executed when the data received by is not the data from the legitimate partner device.

According to the wireless communication device of the second aspect, in addition to operating similarly to the wireless communication device of the first aspect,
In the first wireless communication device, when the control channel is detected by the control channel means, the data transmitted on the control channel is received by the first receiving means. If the data received by the first receiving means is not the data from the legitimate partner device, the priority execution means executes the control channel priority detection means.

The wireless communication device according to claim 3 is the same as that according to claim 2.
In the wireless communication device described above, in the data reception time for each control channel in the data reception by the first receiving means, at least the total of the data reception time is the data transmission source even if the data reception is executed for all the control channels. It is set so as to be within a predetermined data output time of the partner device.

According to a fourth aspect of the present invention, there is provided a radio communication device, wherein a second control channel detecting means for detecting a plurality of control channels for forming a communication link and a plurality of controls detected by the second control channel detecting means. A second communication link forming means for forming a communication link in synchronization with any one of the channels, and an intermittent execution means for causing the second control channel detecting means to intermittently execute the detection of the control channel are provided, and the other party device and the wireless device. A second wireless communication device that executes communication is provided, and the second wireless communication device performs the intermittent detection performed by the intermittent execution means when the control channel is detected by the second control channel detection means. A non-operating time is reduced from that before the channel detection, and the operation changing means for detecting the remaining undetected control channels is provided.

According to the wireless communication apparatus of the fourth aspect, when the second control channel detecting means detects the control channel, the second wireless communication apparatus is executed by the operation changing means by the intermittent execution means. The non-operation time in the intermittent detection is reduced from that before the channel detection, and the detection of the remaining undetected control channels is executed. Then, the second communication link forming means forms a communication link with the partner device in synchronization with the detected control channel.

A wireless communication device according to claim 5 is the wireless communication device according to claim 4.
In the wireless communication device described above, the second wireless communication device includes second receiving means for receiving data transmitted on the control channel when the control channel is detected by the second control channel detecting means, and second receiving means. Recognizing means for recognizing whether or not the data received by the receiving means is data from a legitimate other party device, and if the recognizing means recognizes that the received data is not data from a legitimate other party device And an operation executing means for executing the operation changing means.

According to the wireless communication device of the fifth aspect, in addition to operating similarly to the wireless communication device of the fourth aspect,
In the second wireless communication device, when the control channel is detected by the second control channel detecting means, the data transmitted on the control channel is received by the second receiving means. When the recognizing means recognizes that the data received by the second receiving means is not the data from the legitimate partner device, the operation changing means executes the operation changing means.

The wireless communication device according to claim 6 is the wireless communication device according to claim 5.
In the wireless communication device described above, the second wireless communication device is configured such that the data reception time for each control channel in data reception by the second receiving means is at least that data even if data reception is executed for all control channels. The total reception time is set so as to be within the predetermined data output time of the partner device of the data transmission source.

The wireless communication apparatus according to claim 7 is the same as claim 5.
Alternatively, in the wireless communication device according to the sixth aspect, when the second wireless communication device recognizes that the data received by the recognizing means is data from a legitimate partner device, the second wireless communication device receives the data reception time as a normal reception. The reception time changing means for changing from the time to the extended reception time is provided.

A wireless communication device according to claim 8 is the wireless communication device according to claim 7.
In the wireless communication device described above, a plurality of the second wireless communication devices can be connected to the first wireless communication device as a partner device, and the first wireless communication device,
The first identification information for identifying the first wireless communication device and the second identification information for identifying the second wireless communication device of the transmission destination are cyclically transmitted to all the second wireless communication devices connected by the control channel. The second wireless communication device is configured to transmit the first information transmitted by the information transmitting means.
When the identification information is recognized by the recognizing means as information from a legitimate partner device, the reception time changing means changes the data reception time from the normal reception time to an extended reception time. The extended reception time is set to be a time at which the second identification information addressed to the own device which is cyclically transmitted from the first wireless communication device can be received at least twice.

According to the wireless communication device of the eighth aspect, in addition to operating similarly to the wireless communication device of the seventh aspect,
In the first wireless communication device configured to connect a plurality of second wireless communication devices as the partner device, the information transmitting means cyclically makes the first wireless communication device to all the second wireless communication devices connected by the control channel. First identification information for identifying the wireless communication device and second identification information for identifying the second wireless communication device of the transmission destination are transmitted. On the other hand, in the second wireless communication device, when the first identification information transmitted by the information transmitting means of the first wireless communication device is recognized by the recognizing means as information from the legitimate partner device, the reception time is changed. The means changes the reception time of the data from the normal reception time to the extended reception time. The extended reception time is set to be a time at which the second identification information addressed to the mobile device, which is cyclically transmitted from the first wireless communication device, can be received at least twice.

A radio communication device according to claim 9 is the same as claim 8.
In the wireless communication device described above, when the maximum number of connectable second wireless communication devices is connected to the first wireless communication device, all the second wireless communication devices are addressed to the extended receiving time. The time is set such that the second identification information can be received at least twice.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an external perspective view of a parent-child telephone device 1 in which cordless telephone devices (child devices 1b to 1d) and a parent device 1a are connected by wireless communication. The parent-child telephone device 1 of this embodiment is a facsimile machine, and the child devices 1b to 1d are adapted to communicate with the parent device 1a connected to the telephone line 26 via the wireless line 52.

The base unit 1a is a communication device that performs telephone operation, facsimile operation, and transmission / reception of electronic mail with a partner device connected via the telephone line 26. A handset 3 is attached to a side portion of the main body 2 of the base unit 1a. The handset 3 is placed on a hook (not shown) provided on the main body 2 during non-call, and is picked up and used from the hook during call. The former is called an on-hook state and the latter is called an off-hook state.

An operation panel 4 having a plurality of buttons such as an input button for inputting numerical values and characters and a command input button for inputting a command is provided on the front portion of the upper surface of the main body 2. A setting button 4a, which is one of command input buttons, is provided at the upper left end of the operation panel 4. The setting button 4a is a liquid crystal display (hereinafter simply referred to as "LCD") for an input screen for inputting various settings and commands.
This is a button to display on the 5
When a is pressed by the operator, the input screen is displayed on the LCD 5.

At the center of the operation panel 4, the above-mentioned LC
D5 is provided. The LCD 5 is a display device that displays processing executed by the master device 1a and a communication state between the master device 1a and a partner device connected via the telephone line 26, and includes a touch panel. Base unit 1a
Is operated by a button such as the setting button 4a or the ten-key pad 4b provided on the operation panel 4, the operation state and operation procedure are displayed on the LCD 5.

A document insertion port 6 is provided at the rear of the operation panel 4 and LCD 5. A document to be transmitted by facsimile is inserted into the document insertion port 6 with the document surface facing downward, and after being read, from a document discharge port 7 provided on the front surface of the main body 2 and below the operation panel 4. Is discharged. A recording paper holder mounting portion 9 is provided at the rear of the document insertion opening 6, and a recording paper holder 10 capable of accommodating a plurality of recording papers in a stack is detachably attached to the recording paper holder mounting portion 9. ing. The recording paper supplied from the recording paper holder 10 and used for printing is discharged from the recording paper discharge port 8 provided below the document discharge port 7.

Further, the main body 2 is provided with an antenna 18 (see FIG. 2) as a connecting means for transmitting and receiving various signals and data with the slaves 1b to 1d. The base unit 1a is
Via the antenna 18, the cordless handsets 1b to 1d are connected by a wireless line 52. A radio wave of a predetermined channel (a call channel or a control channel) is used as a medium of data transmitted and received between the master unit 1a and the slave units 1b to 1d.

The base unit 1a configured as described above is adapted to execute communication on any one of channels 1 to 89. Of these channels, two channels, channel 46 and channel 89, are used as control channels for establishing a communication link, and the remaining channels are used as communication channels.

Further, the base unit 1a constantly detects the call channel so as to be able to communicate with the handset units 1b to 1d, and confirms the availability of the call channel (scan of the call channel). Further, in order to detect the communication request (command (data) transmission) from the slaves 1b to 1d, the output of the control channel to which the command related to the communication request is transmitted is constantly (periodically) detected (control channel). Sniff).

It is determined that the master unit 1a can transmit data by this control channel within 4 seconds, and within this 4 seconds, data is transmitted to each of the slave units 1b to 1d connected to the master unit 1a. To do. When transmitting data to a plurality of slaves, the data is cyclically transmitted to each slave as a transmission destination.

The slave units 1b to 1d are communication devices equipped with an antenna 33 (see FIG. 2) for transmitting and receiving data to and from the master unit 1a. The slaves 1b to 1d are the master 1a.
Also, it is configured so that it can be connected to the telephone line 26 via the master unit 1a. The outside line calling from the slaves 1b to 1d is executed by transmitting a command to the master 1a and causing the master 1a to perform an operation based on the command.

Each of the slave units 1b to 1d is provided with an operation panel 37 and an LCD 38 on the front surface of its housing. Operation panel 37
A plurality of ten-keys 37a for inputting numerical values and characters are provided in the central part of. A start key 44 is provided on the upper left side of the numeric keypad 37a. The start key 44 is a button for closing and opening the telephone line 26. When the key 44 is pressed while the line is open, the telephone line 26 is closed.

A microphone 35 for converting a voice signal (user's utterance) into an electric signal is provided below the casings of the cordless handsets 1b to 1d, and an electric signal is provided above the casings of the cordless handsets 1b to 1d. A speaker 36 for converting the signal into an audio signal is provided. As a result, the slaves 1b to 1d can talk with the calling device (the partner device) via the master device 1a or the telephone line 26.

Like the master unit 1a, the slave units 1b to 1d are designed to execute communication on any of channels 1 to 89, and use channels 46 and 89 as control channels. Then
The remaining channels are used as call channels. The presence or absence of a communication request (command (data) transmission) from the parent device 1a is confirmed by constantly checking the radio signal of the control channel from the parent device 1a (sniff of the control channel). From the base unit 1a,
The data to which the ID code of the entire device and the identification number of the transmission destination slave device are added is transmitted. The slaves 1b to 1d respond to the master 1a only when the received data includes the ID code of the entire device and the identification number of the self.

The cordless handsets 1b to 1d configured as described above.
Is removably installed on the charging stand 50. Cordless handset 1b
~ 1d is the connector 49 when installed on the charging stand.
(See FIG. 2) to be connected to the charging stand 50. Also,
When the slaves 1b to 1d are connected to the charging stand 50 by the connector 49, the slaves 1b to 1d enter the on-hook state. By being picked up from the charging stand 50 (the connector 49 is detached from the charging stand), the off-hook state is established. In other words, when the slaves 1b to 1d are picked up from the charging stand 50, a communication request is transmitted to the master 1a through the control channel so as to form the line closed state.

The charging stand 50 is a connected (installed) slave unit 1.
b to 1d are charged with a predetermined voltage. The charging stand 50 is connected to an external power source (not shown) and supplies the power source supplied from the external power source to the slave units 1b to 1d. When the cordless handsets 1b to 1d are detached from the charging base 50, a standby state (a state in which only the minimum necessary process is executed) is inserted between control channel detection processes. We are trying to reduce energy consumption. Therefore, when the cordless handsets 1b to 1d are detached from the charging stand 50, the control channels of the cordless handsets 1b to 1d are detected intermittently.

In the present embodiment, the sniff is whether the master unit 1a and the slave units 1b to 1d receive a signal from the partner station.
This is a process of confirming the radio signal of the control channel. Further, the scan is a process in which the base unit 1a confirms the availability of a call channel. The reply is the master unit 1a and the slave unit 1b.
1d is a process of confirming the radio wave signal of the control channel from the partner station, continuing the radio wave reception of the control channel, and waiting for a command from the partner station.

FIG. 2 is a block diagram showing an electrical configuration of the master unit (facsimile apparatus) 1a and the slave units 1b to 1d. The base unit 1a includes a CPU 11, a ROM 12, and a RAM.
13, an EEPROM 14, a real-time clock (hereinafter simply referred to as "RTC") 15, a voice LSI 17, a cordless unit 51, a network control unit (hereinafter simply referred to as "NCU") 19, a modem 20,
A buffer 21, a scanner 22, an encoding unit 23, a decoding unit 24, a printer 25, an operation panel 4, an LCD 5 and an amplifier 27 are provided, and these are connected to each other via a bus line 29.

The NCU 19 is for controlling the line, and the base unit 1a is connected to the telephone line 26 via the NCU 19.
It is connected to the. The NCU 19 receives a ringing signal and various signals transmitted from the exchange, and dials a dial signal at the time of calling according to the operation of the input button on the operation panel 4 of the master 1a or the operation panel 37 of the slaves 1b to 1d. To an exchange or when the telephone line 26 is closed, data communication such as transmission / reception of an analog voice signal is performed. The NCU 19 is also connected to the handset 3.

The CPU 11 controls each unit connected by the bus line 29 according to various signals transmitted and received through the NCU 19 and executes data communication such as facsimile operation and telephone operation. The ROM 12 is a non-rewritable memory that stores a control program executed by the master unit 1a, and includes a control channel communication process 12a and an initial channel memory 12b.

The control channel communication process 12a is a part of the control program, and is a process mainly for detecting the control channel. This control channel communication process 1
2a is a process for confirming whether or not radio waves are output for the two control channels used between the master unit 1a and the slave units 1b to 1d. In the normal state, the control channel communication processing 12a alternately executes control channel detection and call channel detection, but one control channel is detected, and the detected control channel is noise. , The detection of the other undetected control channel is subsequently executed. The details will be described later in the flowcharts of FIGS.

The initial channel memory 12b is a memory for storing the control channel set when the power is turned on. The parent-child telephone device 1 of the present embodiment is configured to be able to execute communication through the two control channels, but when the power is turned on from the power-off state, it is stored in the initial channel memory 12b in advance. It is set so that the communication with the slaves 1b to 1d is executed on the existing control channel.
In the slaves 1b to 1d as well, the same channel as the channel stored in the initial channel memory 12b is stored in a non-volatile manner, and when the power is turned on from the power-off state, the same channel as that of the master 1a is stored. The communication is set to be executed. According to this, for example, at the time of adding a slave unit, it is possible to quickly start communication between the master unit 1a and the slave unit, which cannot mutually recognize the identification information, by the only set control channel. Therefore, the setting (setup) of information required for subsequent communication between the parent and child
Can be executed efficiently.

The RAM 13 is a memory for temporarily storing various data, and is an A channel flag 13a.
And an A channel standby flag 13b and a B channel standby flag 13c. A channel flag 13a
Is a flag provided in association with one predetermined control channel (A channel). In the control channel communication process 12a, the base unit 1a alternately detects two control channels of channel 46 (A channel) and channel 89 (B channel). Which channel is the next control channel detected? Is indicated by this A channel flag 13a. If the A channel flag 13a is on, detection of the A channel (46th channel) is executed. On the other hand, if the A channel flag 13a is off, the B channel (89th channel) is detected. This A
The channel flag 13a is turned on when the detection operation of the B channel is completed, and turned off when the detection operation of the A channel is completed.

The A channel standby flag 13b is a flag that is turned on when noise of the same channel as the A channel (channel 46) is detected. In the base unit 1a,
When a control channel is detected, reception of data transmitted on that control channel is performed. When the received data is data unrelated to the slaves 1b to 1d, the detected channel A is noise, not the radio waves output from the slaves 1b to 1d. When this noise is detected, the main | base station 1a does not detect a telephone call channel next, but B channel (8 channel) which is another control channel.
9 channel) is detected. That is, the A channel standby flag 13b is a flag for identifying whether or not the B channel is subsequently detected after the detection of the A channel control channel.

The B channel standby flag 13c is a flag which is turned on when noise of the same channel as the B channel (channel 89) is detected. Similar to the A channel standby flag 13b, this is a flag for identifying whether or not the B channel is subsequently detected after the detection of the B channel control channel. Flag 13
b and 13c are turned off after the detection operation of the other undetected control channel is completed.

Decoded facsimile data is temporarily stored in a predetermined area of the RAM 13. The stored facsimile data is then output to the printer 25. The output facsimile data is printed on recording paper by the printer 25, and then R
It is erased from AM13. When the facsimile data is image data, the data amount is generally large, but since the facsimile data is erased on condition that the facsimile data is printed, the RAM 13 can be effectively used. .

The EEPROM 14 is a rewritable nonvolatile memory, and the data stored in the EEPROM 14 is retained even after the power is turned off. This EEPROM14
Includes an ID memory 14a and a slave unit number memory 14b. The ID memory 14a is a memory in which an ID code for identifying the parent-child telephone device 1 is stored. The data transmitted from the master unit 1a to the slave units 1b to 1d includes the master unit 1a.
The ID code stored in the ID memory 14a is added so that the data (command) can be identified. That is, the ID code for identifying the parent-child telephone device 1 is used as identification information (identification information of the parent device 1a) indicating that the data is transmitted from the parent device 1a. When a child device is newly added, the ID code stored in the ID memory 14a is established after communication is established (a wireless link is established) on the control channel stored in the initial channel memory 12b. Is transmitted to the added child device. As a result, the added child device recognizes the parent-child telephone device 1 to which the own child device belongs.

The slave unit number memory 14b stores the slave units 1b to 1b.
This is a memory for storing a unique identification number for identifying each d. The data transmitted from the master unit 1a to the slave units 1b to 1d through the control channel is added with the above ID code and the identification number of the transmission destination slave unit.
When transmitting data to a plurality of child devices, the parent device 1a
The identification number of the slave unit is added to the transmission data of 1, and the identification number is cyclically added and output. As a result, the data is cyclically transmitted to each of the slaves 1b to 1d. The interval of each transmission data is set to 160 ms.

The data transmitted from the slaves 1b to 1d to the master 1a is added with the identification number of each slave. The base unit 1a compares the identification number stored in the handset number memory 14b with the identification number added to the received data to identify from which handset the data is transmitted.

The RTC 15 has a date, a day of the week, an hour, a minute,
It is an IC that measures seconds. The received date and time data is added to the received facsimile data and the like based on the value of the RTC 15, so that management based on the reception time can be performed. This RTC15
A battery circuit 15a that supplies a backup voltage when the power of the parent device 1a is turned off is connected to the. The RTC 15 uses the battery circuit 15a to
It is possible to continue clocking even after the power of the parent device 1a is turned off.

The voice LSI 17 converts the analog voice signal received by the NCU 19 into a digital voice signal, converts the digital voice signal generated inside the master unit 1a into an analog voice signal, and outputs the analog voice signal to the NCU 19. Is.

The antenna 18 includes a master unit 1a and slave units 1b to 1b.
The data and various signals transmitted to the slaves 1b to 1d are transmitted via the antenna 18, while the data is transmitted to and received from the slaves 1b to 1d. Data and various signals transmitted to 1a are transmitted to the antenna 1
8 is received. The received data is input to the CPU 11 via the cordless unit 51. Further, the data transmitted from the master unit 1a to the slave units 1b to 1d is output to the slave units 1b to 1d via the cordless unit 51 and the antenna 18.

The cordless unit 51 is a unit for transmitting voice signals and data signals as radio waves.
The modem 20 performs modulation and demodulation of image data and electronic mail data, and also transmits and receives various procedure signals for transmission control. The buffer 21 is
Coded facsimile data transmitted / received to / from another facsimile apparatus and image data of an original read by the scanner 22 are temporarily stored.

The scanner 22 is for reading the image of the document inserted into the document insertion port 6, and the encoding unit 23.
Is for encoding a document image read by the scanner 22. The decoding unit 24 reads the received facsimile data stored in the buffer 21 and decodes it, and the decoded data is RA
After being temporarily stored in M13, the printer 25 sequentially prints the recording paper.

The operation panel 4 is used by the user to perform various operations such as setting of the base unit 1a as described above. The amplifier 27 is for causing a speaker 28 connected to the amplifier 27 to ring and outputting a ringing tone or a voice message.

Next, the electrical configuration of the slaves 1b to 1d will be described using the slave 1b. In addition, cordless handsets 1c and 1
Since d has the same configuration as the child device 1b, its description is omitted. The child device 1b includes a CPU 30, a ROM 31, and a RAM 3
2, an EEPROM 39, a cordless unit 34, an operation panel 37, and an LCD 38 are provided, and these are connected to each other.

The CPU 30 controls each unit in accordance with a signal input by the user, various signals transmitted from the base unit 1a via the cordless unit 34, telephone operation, etc. (including data communication with the base unit 1a). ) Is performed. The ROM 31 is a non-rewritable memory that stores a control program and the like executed by the child device 1b. The ROM 31 includes a slave unit control channel communication process 31a, an initial channel memory 31b, and a first reply value memory 31.
c, and a second reply value memory 31d.

The slave unit control channel communication process 31a is a part of the control program, and is a program that mainly executes the detection of the control channel in the slave unit 1b. This slave unit control channel communication processing 31a is performed by the master unit 1a and the slave unit 1b.
This is a process of confirming whether or not radio waves are output for the two control channels (A channel (46 channels) and B channel (89 channels)) used between and. This slave unit control channel communication processing 31a
In the normal state, the detection of the two control channels is alternately and continuously executed. However, when the cordless handset 1b is detached from the charging stand 50, the standby state is established between the detection processes of the respective control channels. Insert. That is, the detachable slave unit 1b is configured to intermittently detect the control channel. For details, see FIG.
This will be described later with reference to the flowchart of FIG.

The initial channel memory 31b is a memory for storing the control channel set when the power is turned on. The same channel as the channel stored in the initial channel memory 31b is stored in advance in the initial channel memory 12b of the parent device 1a. Therefore, when the power is turned on from the power-off state, the communication is set to be executed on the channel stored in the initial channel memory 31b, like the main device 1a.

The first reply value memory 31c and the second reply value memory 31d are memories for storing a predetermined reception time for receiving the data transmitted on the control channel. The first reply value memory 31c stores 700 ms (milliseconds) as a normal data reception time.
Is remembered. In the second reply value memory 31d,
1400 ms is stored as the extended reception time (extended data reception time).

As described above, the ID code and the identification number of the transmission destination slave unit are added to the data transmitted from the master unit 1a through the control channel, and one transmission data item has a child number of 1. The machine identification number is added. In addition, the identification number is cyclically added to the transmission data,
It is output from the master unit 1a every ms. Therefore, each child device 1b
The data reception in ~ 1d is also cyclically performed.

On the other hand, an ID code is added to the transmission data transmitted from the base unit 1a on the control channel.
Therefore, if the ID code is added to the received data, the child device 1b determines that the detected control channel is the parent device 1a.
It can be determined that it is transmitted from. That is,
It is possible to predict that the data addressed to itself will be transmitted.

Normally, in the slave unit 1b, the data reception time when the control channel is detected is 700 ms which is the value stored in the first reply value memory 31c. However, if the data transmitted on the detected control channel includes the ID code of the parent-child telephone device 1, it can be predicted that the data will be transmitted to itself, so that the data reception time is The extended data reception time stored in the reply value memory 31d is changed to 1400 ms.

This extended data reception time (1400
ms) is the time at which each slave can receive the data output cyclically to each slave at least twice even when the maximum number of slaves that can be connected to the master 1a are connected. Since the maximum number of connected slaves in this embodiment is 4, even if the slaves are output from the master 1a to the four slaves at 160 ms intervals, each slave will receive the data reception time (1400).
It is possible to perform data reception twice in (ms).

In a normal state, a radio wave transmitted twice at intervals has a high reliability of being received at least once. Therefore, the extended data reception time (1400 m) is required so that the data addressed to itself can be received at least twice.
By designing s), the reliability of data reception is guaranteed.

The RAM 32 is a memory for temporarily storing various data, and the A channel slave unit flag 3 is used.
2a, a slave unit A channel standby flag 32b, and a slave unit B channel standby flag 32c. The A-channel slave unit flag 32a is a flag provided in association with one predetermined control channel (A-channel). Similarly to the master unit 1a, the slave unit 1b also detects two control channels of channel 46 (A channel) and channel 89 (B channel) alternately in the slave unit control channel communication process 31a. The A-channel slave unit flag 32a indicates which channel is the control channel detected next. If the A channel slave unit flag 32a is on, detection of the A channel (46th channel) is executed. On the other hand, if the A-channel slave unit flag 32a is off, the B-channel (89th channel) is detected. The A-channel slave device flag 32a is turned on at the timing when the detection operation of the B-channel is completed, and turned off at the timing when the detection operation of the A-channel is completed.

The slave unit A channel standby flag 32b is a flag which is turned on when the slave unit 1b detects noise on the same channel as the A channel (channel 46). This child device A channel standby flag 32b is set to A
It is a flag for identifying whether or not the B channel detection process is subsequently performed after the channel detection process is executed. In addition, the slave unit B channel standby flag 32c
Is a flag that is turned on when the slave unit 1b detects noise on the same channel as the B channel (89th channel). Similar to the slave unit A channel standby flag 32b, this flag is a flag for identifying whether or not to subsequently detect the B channel after detecting the control channel of the B channel. The flags 32b and 32c are turned off after the detection operation of the other undetected control channel is completed.

The EEPROM 39 is a rewritable nonvolatile memory, and the data stored in the EEPROM 39 is retained even after the power is turned off. This EEPROM39
Includes an ID memory 39a and a slave unit number memory 39b. The ID memory 39a is a memory in which an ID code for identifying the parent-child telephone device 1 is stored. When a child device is newly added to the parent device 1a, the ID code stored in the ID memory 14a of the parent device 1a is transmitted to the added child device, and the transmitted ID code is It is stored in the ID code memory.

The slave unit number memory 39b stores a unique identification number of the slave unit. When the data to which this identification number is added is transmitted from the master unit 1a, the slave unit 1b becomes the master unit 1a. Recognize that the data was sent from the device to itself. Further, the identification number stored in the slave unit number memory 39b is added to the data to be transmitted to the master unit 1a and transmitted.

The antenna 33 transmits and receives radio waves between the slave unit 1b and the master unit 1a, and is connected to the cordless unit 34, the microphone 35, and the speaker 36. The analog voice signal transmitted from the base unit 1a is output to the speaker 36 after being received by the antenna 33, and the analog voice signal (user's utterance) input from the microphone 35 is transferred from the antenna 33 to the base unit 1a. Is sent.

The cordless unit 34 is a unit for transmitting voice signals and data signals as radio waves.
The cordless unit 34 is for transmitting / receiving data to / from the master unit 1a, and various signals transmitted from the slave unit 1b to the master unit 1a are transmitted by the cordless unit 34a.
Various signals transmitted from the master unit 1a to the slave unit 1b from the master unit 1a through the antenna 33 are received by the antenna unit 33 and then transmitted to the CPU 3 via the cordless unit 34.
Input to 0.

The slave unit 1b is configured to be connected to the charging stand 50 via the connector 49. And
When the connector 49 is connected to the charging stand 50, the slave unit 1b receives power supply from an external power supply. The supplied power is supplied to the power supply unit 48 incorporated in the child device 1b via the connector 49. The power supply unit 48 is provided with a secondary battery, and the secondary battery is charged by the supplied power. Since the slave unit 1b is supplied with power from the power supply unit 48, the power supply is guaranteed (by the secondary battery provided in the power supply unit 48) even when it is picked up from the charging stand 50 and operated.

The CPU 30 monitors the connection state between the connector 49 and the charging stand 50, and when the CPU 30 recognizes that the connector 49 is detached from the charging stand 50, the CPU 30 executes the slave unit control channel communication process 31a. The control channel detection process to be executed is executed intermittently.

Next, referring to FIGS. 3 and 4, the base unit 1a
Alternatively, the timing of control channel detection in the slaves 1b to 1d will be described. FIG. 3 is a timing chart schematically showing control channel detection executed by the master unit 1a. The horizontal axis is the time axis 75, and the time axis 7
The origin O of 5 indicates 0 ms (millisecond), and
The point is 1000m, which is the output time of the control channel of the slave unit.
s (1 second).

In the master-slave telephone device 1, if there is a communication request from the slaves 1b to 1d, the master 1a establishes a communication link with the slaves 1b to 1d based on the communication request (establishment of wireless link). ) And start communication. Since the slaves 1b to 1d output this communication request through the control channel, the master 1a constantly detects the control channel so that it can respond to the communication request from the slaves 1b to 1d. Of.

After the wireless link is established, the base unit 1a and the handset units 1b to 1d transit to any of the available call channels and perform data communication such as a call on the transitioned call channel. Run. Therefore, the base unit 1a
The control channels output by the slaves 1b to 1d are detected, and the detection of idle communication channels is also performed steadily (periodically).

FIG. 3A shows the detection timing of the control channel in the normal state, that is, when the radio wave of the control channel is not detected. Control channel detection (control channel sniff) and call channel detection (call channel scan) are executed alternately. When detecting a control channel, one of the control channels is detected at a timing of 1. It Also,
In the control channel detection, the detection of the two control channels is performed alternately. In FIG. 3A, first, 1
The 0 ms A channel is being detected (detection unit 55). However, since the A channel was not detected, the detection of the communication channel of 170 ms is subsequently executed (detection unit 56). After that, the detection of the B channel of 10 ms is executed (detection unit 57), the B channel is not detected here either, and the detection of the communication channel of 170 ms is executed again (detection unit 58). In the state where the radio wave of the control channel is not detected, the detection pattern (detection units 55 to 58) is repeatedly executed. As a result, it is possible to uniformly and efficiently detect the control channel and the vacant communication channel.

FIG. 3B shows the detection timing of the control channel when the control channels (legal radio waves) are output from the slave units 1b to 1d. When any control channel is detected (A channel in FIG. 3B, the detection unit 55 ′), the parent device 1a waits for data reception from the child device for 390 ms (executes data reception) (reply). Part 59). When data (connection request signal or the like) from the child device is received within this 390 ms, the device transits to the call channel (transition unit 71), and the master device 1a and the control channel output source (that is, the communication request source) are transferred. Execute communication with the child device.

FIG. 3C shows the detection timing of the control channel when the detected one control channel is noise. If there is a 46-channel (A channel) or 89-channel (B channel) radio wave in the vicinity, the parent device 1a detects it as a control channel without distinction from the radio waves output by the child devices 1b to 1d. Figure 3
In (c), first, the A channel is detected (detection unit 55 ′). In such a case, 390ms
In the reply unit 59, if the data (connection request signal or the like) is not transmitted from the child device, the detected control channel is determined as noise. Conversely, even if the noise is detected, the reply unit 59 must wait for the reception of data in order to determine the noise. Then, after that, the setting of the channel to be detected immediately is changed to the undetected B channel, and the detection of the B channel is executed (detection unit 57 '). When the B channel is detected by the detecting unit 57 ', the data from the slave units 1b to 1d is received (standby) again for 390 ms (reply unit 60).

As described above, since the radio waves are output not only from the slave units 1b to 1d but also from various places, the slave unit 1
The radio waves (noise) are superimposed on the control channels output from b to 1d. Here, the noise may be output on the same channel as the control channel. Since the control channels are alternately detected one by one, even if the B channels are output from the slaves 1b to 1d, a situation occurs in which the A channel, which is noise, is detected first. However, as shown in FIG. 3C, in the base unit 1a, when noise is detected, priority is given to detection of a call channel, and immediately detection of another control channel that has not been detected is executed. ,
Even if both control channels are detected and their data reception is executed, the series of processes can be completed within 1 second. That is, from the slaves 1b to 1d,
Although the control channel is output only for 1 second, even if the noise is erroneously detected first, the data transmitted on the valid control channel can be surely received.

FIGS. 3D and 3E show the detection timing of the control channel as a comparative example. Figure 3
In (d), the A channel is detected (detection unit 55 ′), and 390 ms data reception (standby) is executed (reply unit 59). In FIG. 3 (d), even if the data from the slaves 1b to 1d cannot be received, the 170 ms call channel is detected (detection unit 56). After detecting this call channel,
Since the undetected B channel is detected (detection unit 57 '), if the B channel is detected here, it exceeds 1 second at the data reception (reply unit 59) stage, and the slave unit 1b is detected.
The data transmitted from ~ 1d cannot be completely received.

In FIG. 3 (e), channel A is detected (detection section 55 '), and data reception (standby) of 500 ms is executed (reply section 61). Then, the undetected B channel is immediately detected (detection unit 5
7 '), the data reception time of the reply unit 61 is not appropriate, so data reception on the B channel (reply unit 6
At the stage of 1), since it exceeds 1 second, the cordless handsets 1b to 1
The data transmitted from d cannot be completely received.

As described above, the base unit 1a according to the present embodiment, which has the specifications for establishing the wireless link by the two control channels,
Even if data reception is executed on both of the two control channels,
The series of processes can be completed within 1 second. Therefore, even if noise is detected as the control channel, it does not hinder data reception on the legitimate control channel.

FIG. 4 shows the slave unit 1 detached from the charging stand 50.
It is a timing chart which showed typically the timing of control channel detection performed in b-1d. The horizontal axis is
It is the time axis 75, and the origin O of the time axis 75 is 0 ms.
And point a indicates the output time of the control channel of the master unit, which is 4000 ms (4 seconds).

In the parent-child telephone device 1, the slave units 1b to 1d.
If there is a communication request from the master device 1a, based on this, a communication link is established with the master device 1a (establishment of a wireless link), and communication is started. Since the master unit 1a outputs this communication request through the control channel, the slave units 1b to 1d constantly detect the control channel so that they can respond to the communication request from the master unit 1a, like the master unit 1a. -ing As described above, at the time of attachment / detachment from the charging stand 50, in order to reduce power consumption, the detection of this control channel is intermittently performed with the standby state interposed.

FIG. 4A shows the detection timing of the control channel in the normal state, that is, when the radio wave of the control channel is not detected. Normally, detection of A channel and B channel (sniff of control channel) is executed alternately, and a standby state is set between detection of A channel and detection of B channel. In FIG. 4A, first, detection of the A channel for 10 ms is executed (detection unit 65). However, since the A channel was not detected, the standby state continues for 1065 ms (standby unit 66). After that, 10m
The detection of the B channel of s is performed (detection unit 67), and the B channel is not detected here either, and again 1065 ms.
(Standby unit 66). In the state where the radio wave of the control channel is not detected, the detection pattern (detection units 65 to 67) is repeatedly executed.

FIG. 4B shows the detection timing of the control channel when the control channel (legal radio wave) is output from the base unit 1a. In the slaves 1b to 1d whose standby state (standby unit 66) has ended, a channel (A channel in FIG. 4B) different from the previous detection is detected, and the A channel is detected. Yes (detection unit 65 '). Therefore, data reception is executed (standby) in order to receive the data transmitted on the A channel. Here, when the data is received and the received data includes the ID code of the parent-child telephone device 1, it can be predicted that the data is transmitted to the own device. Therefore, the data reception time at the reply unit is set to the extended data reception time of 1400 ms (reply unit 68 ′). However, if the identification number of the own device cannot be received within this 1400 ms, the data being output from the master device 1a is the data transmitted to the other slave devices, and thus the standby state is entered (standby). Part 66).

Further, when the identification number of the own device is received within 1400 ms of the reply unit 68 ', it transits to the call channel (transition unit 72) and executes communication with the master unit 1a ( FIG. 4 (c)).

FIG. 4D shows the detection timing of the control channel when the detected one control channel is noise. Also in the child devices 1b to 1d, if there is a radio wave of channel 46 (A channel) or channel 89 (channel B) in the vicinity, it is detected as a control channel without distinction from the radio wave output by the parent device 1a. In FIG. 4D, first, the A channel is detected (detection unit 65 ′). In such cases, 7
If the 00 ms reply unit 68 does not receive the ID code of the parent-child telephone device 1, the detected control channel is determined as noise. Then, the undetected B channel is immediately detected (detection unit 67 ′). Here, if the B channel is detected and the ID code of the parent-child telephone device 1 is further included, data reception is executed (standby) at the extended data reception time of 1400 ms in the reply section (reply section 68 '). ).

As described above, in the slave units 1b to 1d, as shown in FIG.
As shown in (d), when noise is detected,
Since the detection of other control channels that have not been detected is executed immediately without shifting to the standby state, even if both control channels are detected and their data reception is executed,
The series of processes can be completed within 4 seconds. That is, the data transmitted on the control channel can be reliably received (within 4 seconds) from the master device 1a that can output the control channel for only 4 seconds.

FIG. 4E shows the detection timing of the control channel as a comparative example. In FIG. 4E, channel A is detected (detection unit 65 ′), and 70
Data reception (standby) of 0 ms is executed (reply unit 68). In the 700 ms reply unit 68, the detected control channel is judged as noise because the ID code of the parent-child telephone device 1 is not received, but in FIG. 4 (e), when the ID code cannot be received, Is also in the standby state (standby unit 66). After that, the detection of the undetected B channel is executed (detection unit 67 ′), and when the B channel is detected here, it is 4 at the stage of data reception (reply unit 68 ′).
Since it exceeds the second, the data transmitted from the slaves 1b to 1d cannot be completely received.

Next, referring to the flow charts of FIGS. 5 to 7, the master device 1 of the master-slave telephone device 1 configured as described above
The control channel communication process executed in a will be described. The control channel communication process is repeatedly executed in a state where the communication channel is not changed, and the slave units 1b to 1d.
The control channel (communication request) output from is detected,
This is a process for forming a communication link with the slaves 1b to 1d.

In this control channel communication process, first,
It is confirmed whether or not the A channel flag 13a is turned on (S1). If the A channel flag 13a is turned on (S1: Yes), the control channel to be detected next is the A channel. A channel sniff processing for detection is executed (S2). After the execution of the A channel sniff process (S2), the A channel flag 13a is turned off (S3), and it is confirmed whether or not a transition to the call channel is made (S4). In the A channel sniff process (S2), when a wireless link is established with the slaves 1b to 1d and a transition is made to the call channel (S2).
4: Yes), the control channel communication process is ended in order to shift to the call process by the call channel.

On the other hand, as a result of the confirmation in the processing of S4, if the channel has not been changed to the call channel (S4: No), it is confirmed whether or not the A channel standby flag 13b is turned on (S5). Here, the A channel standby flag 13b
When is turned on (S5: Yes), it indicates that the A channel is detected by the A channel sniff process (S2) and the data reception is executed. Further, in the processing of S5, since it is in the state in which the channel has not been changed to the call channel, the turning on of the A channel standby flag 13b indicates that the channel detected in the A channel sniff processing (S2) is noise. .

Therefore, it is confirmed whether or not the B channel standby flag 13c is turned on (S6). If the B channel standby flag 13c is on (S
6: Yes), the executed A channel sniff process (S
2) is executed because the B channel has already been detected and the B channel has been detected by noise. Therefore, the B channel standby flag 13c is turned off (S7), and a call channel scanning process for detecting a call channel is executed (S8).

After that, the B channel sniff process is executed (S9), and the A channel flag 13a is turned on (S9).
10). By turning on the A channel flag 13a,
The control channel to be detected next time is set as the B channel. Then, it is confirmed whether or not the channel has changed to the call channel (S11), and the B channel sniff process (S9).
In step S11, if a wireless link is established with the slaves 1b to 1d and a transition is made to the call channel (S11:
Yes), the control channel communication process is ended in order to shift to the call process by the call channel.

On the other hand, as a result of confirmation in the processing of S11, if the channel has not transitioned to the call channel (S11: No), B
It is confirmed whether or not the channel standby flag 13c is turned on (S12), and it is confirmed whether or not the channel detected by the B channel sniff process (S9) is noise. As a result of the confirmation, when the B channel standby flag 13c is turned on (S12: Yes), noise is detected in the B channel sniff process (S9). Therefore, it is determined whether the A channel standby flag 13b is turned on. Check (S13).

As a result, the A channel standby flag 13b
If is turned on (S13: Yes), the executed B
The channel sniff process (S9) is executed because the A channel has already been detected and the A channel has been detected due to noise. Therefore, the A channel standby flag 13b is turned off (S14), and a call channel scanning process for detecting a call channel is executed (S15). After that, the process shifts to the process of S2, and the control channel communication process is repeatedly executed.

If the A channel flag 13a is off (S1: No) as a result of confirmation in the process of S1, the control channel to be detected next is the B channel, and therefore the process proceeds to the process of S9. Then, the B channel sniff process (S9) is executed.

Further, as a result of confirmation in the process of S5, if the A channel standby flag 13b is off (S5: N
o) In the A channel sniff process (S2), since the A channel is not detected, the process of S6 is skipped and the process proceeds to the process of S7.

In addition, as a result of confirmation in the process of S6, if the B channel standby flag 13c is off (S6: N
o), noise is detected in the A channel sniff process (S2), and the B channel sniff process (S)
Since 9) has not been executed, the A channel sniff process (S
In order to execute the B channel sniff process (S9) subsequent to 2), the process is performed by the B channel sniff process (S9).
Go to 9).

On the other hand, as a result of confirmation in the process of S12, if the B channel standby flag 13c is off (S12: N
o) In the B channel sniff process (S9), since the B channel is not detected, the process of S13 is skipped and the process proceeds to the process of S14.

As a result of confirmation in the process of S13, if the A channel standby flag 13b is off (S13: N
o), noise is detected in the B channel sniff process (S9), and the A channel sniff process (S9)
2) has not been executed yet, so the B channel sniff process (S
In order to execute the A channel sniff process (S9) subsequent to 9), the process shifts to the process of S2.

In this way, when one detected channel is noise, the other undetected channel is promptly detected, so that the slave units 1b to 1d output data on the other control channel. However, it can be reliably received to form a communication link with high reliability.

FIG. 6 is a flowchart of the A channel sniff process (S2) executed in the control channel communication process of FIG. In the A channel sniff process (S2), first, the setting of the detection channel is switched to 10 m.
Sniff (detect) the A channel for s (S2)
1). Then, it is confirmed whether or not the electric field (radio wave) of the A channel is detected (S22). As a result, if the electric field (radio wave) of the A channel is not detected (S22: N
o), the A channel sniff process (S2) is ended.

As a result of the confirmation in the process of S22, if the electric field (radio wave) of the A channel is detected (S22:
Yes), the reception of data from the slaves 1b to 1d is performed at 390.
It is executed (standby) for ms (S24). Then, it is confirmed whether or not the data from the slaves 1b to 1d is received (S
25) Here, if there is no data received from the slaves 1b to 1d (S25: No), the detected A channel is noise, and therefore A indicating that noise has been detected is indicated.
The channel standby flag 13b is turned on (S26), and the A channel sniff process (S2) ends. On the other hand, S
As a result of the confirmation in the process of 25, when the data from the slaves 1b to 1d is received (S25: Yes), the communication channel is changed to (S27), and the A channel sniff process (S2) is ended.

FIG. 7 is a flowchart of the B channel sniff process (S9) executed in the control channel communication process of FIG. B channel sniff processing (S9)
Is executed in the same manner as the A channel sniff process (S2) in FIG. 6, and first, the setting of the detection channel is switched to 1
The channel B is sniffed for 0 ms (S31). Then, based on the detection of the electric field (radio waves) of the B channel,
The reception of data from the slaves 1b to 1d for 390 ms,
It executes (standby) (S32 to S34). And cordless handset 1
It is confirmed whether or not the data from b to 1d is received (S3
5) As a result, if the detected B channel is noise (S35: No), the B channel standby flag 13c is turned on (S36), and the B channel sniff process (S36) is performed.
9) is ended. On the other hand, when the data from the slaves 1b to 1d is received (S35: Yes), the communication channel is transited to (S37) and the B channel sniff process (S9) is ended.

Next, the slave unit control channel communication processing executed by the slave units 1b to 1d of the master-slave telephone device 1 will be described with reference to the flowcharts of FIGS. The slave unit control channel communication process is repeatedly executed in a state where the communication channel is not changed, detects a control channel (communication request) output from the master unit 1a, and establishes a communication link with the master unit 1a. This is a process for forming.

In this slave unit control channel communication processing, first, it is confirmed whether or not the slave units 1b to 1d are installed on the charging stand 50 (S41), and as a result, the slave units 1b to 1d move to the charging stand 50. If not installed (S41: No), A
It is confirmed whether or not the channel slave unit flag 32a is turned on (S42). If the A-channel slave unit flag 32a is turned on (S42: Yes), the control channel to be detected next is the A-channel,
A slave A channel sniff process for detecting the A channel is executed (S43).

Then, the slave unit A channel sniff process (S
43), the A-channel slave unit flag 32a is turned off (S44), and then the slave unit A-channel sniff process (S).
In 43), it is confirmed whether or not the call channel has been changed (S45). As a result, in the slave device A channel sniff process (S43), when the wireless link is established with the master device 1a and the mobile phone is switched to the call channel (S43).
45: Yes), the slave unit control channel communication process is ended in order to shift to the call process by the call channel.

On the other hand, as a result of the confirmation in the process of S45, if the call channel is not changed (S45: No), it is checked whether or not the slave unit A channel standby flag 32b is turned on (S46). If the A channel standby flag 32b is off (S46: No), the A channel is not detected in the slave A channel sniff process (S43). Therefore, the slave unit B channel standby flag 32
c is turned off (S47), and the standby process is executed (S48). As a result, the slaves 1b to 1d are in the standby state for a predetermined time (about 1 second in this embodiment).

Next (after completion of the standby process), the slave unit B channel sniff process is executed (S49) to detect the B channel. After execution of the slave B channel sniff process (S49), the slave A channel flag 32 is set.
A is turned on (S50), and the control channel to be detected next time is set as the B channel. Then, in the slave B channel sniff process (S49), it is confirmed whether or not a transition to the call channel is made (S51), and in the slave B channel sniff process (S49), a wireless link is established with the master 1a. When it is established and transits to the call channel (S51: Yes), the slave unit control channel communication process is ended so as to shift to the call process by the call channel.

As a result of the confirmation in the process of S51, if it is not transited to the call channel (S51: No), it is confirmed whether or not the slave unit B channel standby flag 32c is turned on (S52). Here, when the slave B channel standby flag 32c is off (S52: No), the B channel is not detected in the slave B channel sniff process (S49). Therefore, the slave unit A channel standby flag 32b is turned off (S53), the standby process is executed (S54), and then the process proceeds to the process of S41. As a result, a series of processes for detecting the control channel is repeatedly executed.

Further, as a result of confirmation in the process of S41, if the slave units 1b to 1d are installed on the charging stand 50 (S41:
Yes), since the power supply is sufficiently secured, the charging sniff process that alternately executes the alternate detection of the two control channels is executed (S59), and the process proceeds to the process of S41. Accordingly, while the slaves 1b to 1d are installed on the charging stand 50, the control channel is repeatedly detected without sandwiching the standby state.

Furthermore, as a result of the confirmation in the process of S42, if the A-channel slave unit flag 32a is off (S42: N
o) Since the control channel to be detected next is the B channel, the processing is shifted to the processing of S49.

In addition, as a result of checking in the process of S46, if the slave unit A channel standby flag 32b is turned on (S46: Yes), the slave unit A channel sniff process (S
In 43), the A channel is detected, and it is shown that the data reception is executed. Further, in the process of S46, the call channel is not changed. Therefore, the ON state of the A channel standby flag 32b indicates that the channel detected by the slave A channel sniff process (S43) is noise.

Therefore, it is further confirmed whether or not the slave unit B channel standby flag 32c is turned on (S5).
7). Here, if the child device B channel standby flag 32c is turned on (S57: Yes), the executed child device A is executed.
The channel sniff process (S43) is executed because the B channel has already been detected and the B channel has been detected by noise.
The process shifts to 7.

On the other hand, as a result of checking in the process of S57, if the slave unit B channel standby flag 32c is off (S
57: No), slave unit A channel sniff process (S43)
In addition, since the noise is detected and the slave B channel sniff process (S49) has not been executed, the slave B channel sniff process (S49) should be executed subsequently to the slave A channel sniff process (S43). Then, the processing shifts to the slave B channel sniff processing (S49).

In addition, as a result of checking in the process of S52, if the slave unit B channel standby flag 32c is turned on (S52: Yes), the slave unit A channel sniff process (S
The control channel detected in 43) is noise. Therefore, it is further confirmed whether or not the slave unit A channel standby flag 32b is turned on (S58), and if the slave unit A channel standby flag 32b is on (S5).
8: Yes), the executed slave B channel sniff process (S49) is executed because the A channel has already been detected and the A channel has been detected by noise. Then, the process proceeds to S53.

As a result of confirmation in the process of S58, if the slave unit A channel standby flag 32b is off (S
58: No), slave unit B channel sniff process (S49)
In addition, since the noise is detected and the slave unit A channel sniff process (S43) has not been executed, the slave unit A channel sniff process (S43) should be executed subsequently to the slave unit B channel sniff process (S49). Then, the process shifts to the slave unit A channel sniff process (S43).

FIG. 9 shows a slave unit A channel sniff process (S4) executed in the slave unit control channel communication process of FIG.
It is a flowchart of 3). In the slave A channel sniff process (S43), first, the setting of the detection channel is switched to sniff (detect) the A channel for 10 ms (S61). Then, it is confirmed whether or not the electric field (radio wave) of the A channel is detected (S62). As a result, if the electric field (radio wave) of the A channel is not detected (S62: No), this slave A channel sniff process is performed. To finish.

On the other hand, when the electric field (radio wave) of the A channel is detected (S62: Yes), the data reception (reply) from the base unit 1a is stored in the first reply value memory for the data reception time of 700 ms. It is executed (standby) for a while (S64). Then, it is confirmed whether or not the ID code from the base unit 1a is received within the 700 ms (S65).
Here, when the ID code is received (S65: Ye
s), since the output source of the control channel is the master device 1a (no noise), it can be predicted that data is transmitted from the master device 1a to the own device. Therefore, in order to receive the identification number of the slave unit transmitted from the master unit 1a, the reception (reply) of the data from the master unit 1a is executed with the extended data reception time 1400 ms stored in the second reply value memory. (S66). That is, the data reception time is extended (changed).

Next, it is confirmed whether or not the identification number of the own device has been received during the extended data receiving time (S6).
7) As a result, if the identification number of the own device is not received (S67: No), the slave device A channel sniff process (S43) is ended.

As a result of confirmation in the process of S65, ID
If the code is not received (S65: No), the output source of the control channel is not the master device 1a. That is, the detected A
Since the channel is noise, the slave unit A channel standby flag 32b is turned on (S68), and this slave unit A channel sniff process is ended.

Furthermore, as a result of confirmation in the process of S67, if the identification number of the own device is received (S67: Yes), the mobile phone transits to the call channel (S69), and this slave A channel sniff process (S43). To finish.

FIG. 10 shows a slave unit B channel sniff process (S) executed in the slave unit control channel communication process of FIG.
49) is a flow chart. The slave B channel sniff process (S49) is a slave A channel sniff process (S49).
43). First, the setting of the detection channel is switched, the B channel is sniffed for 10 ms (S71), and when the electric field (radio wave) of the B channel is detected, the main unit is operated for 700 ms. Data reception from 1a is executed (standby) (S71 to S74). Here, if the ID code (response from the master unit 1a) cannot be received, the slave unit B
The slave B channel standby flag 32c indicating that the control channel detected in the channel sniff process (S49) is noise is turned on, and the slave B channel sniff process (S49) is ended.

When the ID code is received within the 700 ms, the data receiving time is changed to the extended data receiving time (1400 ms) (S75, S7).
6). Here, if the identification number of the own device is not received, the child device B
When the channel sniff process (S49) is completed, and the identification number of the own device is received, the mobile phone B transits to the call channel and the slave device B channel sniff process (S49) is completed (S77 to S79).

As described above, according to the parent-child telephone device 1 of this embodiment, the communication link is established between the parent device 1a and the child devices 1b to 1d in synchronization with any of a plurality of control channels. To form. In such a case, even if the noise is output by being superimposed on the control channel, the legitimate control channel output from the partner device is surely detected,
A communication link can be formed with high reliability based on the data transmitted on the legitimate control channel.

In this embodiment, the control channel detecting means described in claim 1 corresponds to the processing of S2 and S9 of FIG. The communication link forming means according to claim 1 corresponds to the processing of S22 to S25 and S27 of FIG. 6 and the processing of S32 to S35 and S37 of FIG. The call channel detecting means according to claim 1 is S8 in FIG.
And the processing of S15. The alternate detection means according to claim 1 corresponds to the processing of S1 to S15 of FIG. As the control channel priority detecting means according to claim 1, FIG.
The No branch of the process of S6 and the No branch of the process of S13 are applicable. The process of S24 of FIG. 6 and the process of S34 of FIG. 7 correspond to the first receiving means described in claim 2. The priority execution means according to claim 2 is S6 in FIG.
The branch to No of the process of No. and the branch to No of the process of S13 correspond.

The processing of S43 and S49 of FIG. 8 corresponds to the second control channel detecting means according to the fourth aspect.
As the second communication link forming means according to claim 4, the processing of S62 to S67 and S69 in FIG. 9 and S72 to S72 in FIG.
This corresponds to the processing of S77 and S79. The intermittent execution means described in claim 4 corresponds to the processing of S43 to S58 of FIG. The operation changing means according to claim 4 corresponds to the No branch of the process of S57 and the No branch of the process of S58 in FIG. The processing of S64 of FIG. 9 and the processing of S74 of FIG. 10 correspond to the second receiving means described in claim 5. As a recognition means according to claim 5, S65 of FIG.
And the process of S75 of FIG. 10 correspond. Claim 5
As the described operation executing means, No in the process of S57 of FIG.
To and the branch to No in the process of S58.
The reception time changing means according to claim 7 is S66 of FIG.
And the processing of S76 in FIG.

In the processing of S64 and S66 of the slave A channel sniff processing of FIG. 9 and the processing of S74 and S76 of the slave B channel sniff processing of FIG. 10, the slaves 1b to 1d are the masters 1a. The process of the master unit 1a which receives the ID code and the identification number of the slave unit from the device, but which transmits the ID code and the identification number of the slave unit corresponds to the information transmitting means according to claim 8.

The present invention has been described above based on the embodiments.
The present invention is not limited to the above embodiments, and it can be easily inferred that various improvements and modifications can be made without departing from the spirit of the present invention.

For example, in the present embodiment, the data reception time for receiving data from the master unit 1a in the slave units 1b to 1d is based on the case where the maximum number of slave units that can be connected to the master unit 1a are connected. It was the time provided. Instead of this,
It may be set based on the registered number (the number actually connected). Furthermore, in the parent-child telephone device of this embodiment,
The control channel to be detected next is determined by the state (whether it is ON or not) of the A channel flag 13a or the A channel slave unit flag 32a. Therefore, when the call (data transmission / reception) on the call channel ends and the process returns to the control channel detection process, the control channel opposite to the control channel detected before is detected. There is. Instead of this, the parent-child telephone device 1 may be configured to preferentially use the control channel that succeeded in the previous communication, and may be detected from that channel. In addition, the master unit 1a or the slave units 1b to 1d do not need to alternately use the control channels to output when attempting data communication with the partner device (the master unit 1a or the slave units 1b to 1d). The successful use of the control channel may be continued, or the used channel may be changed when the formation of the communication link fails. Also, the history of successful communication with the control channel is stored, and the control channel with the higher probability is output (used for data transmission).
You may. Further, the probability may be statistically calculated in the time zone to calculate the superiority in the time zone, and the control channel to be used may be determined based on the superiority in the time zone. According to such a method, the formation of the communication link by the control channel can be executed more reliably.

[0134]

According to the wireless communication device of the first aspect,
The first wireless communication device alternately operates the control channel detection means and the communication channel detection means by the alternating detection means to detect the control channel and the communication channel alternately. When one control channel is detected by the control channel detection means, the detection of the remaining undetected control channels is executed with priority over the detection of the communication channel. Therefore, there is an effect that the control channel can be detected at an appropriate timing. For this reason,
When using a plurality of control channels, it is possible to accurately detect the control channel being used (output from the partner device) and form a communication link with certainty.

According to the wireless communication device of the second aspect, in addition to the effect of the wireless communication device of the first aspect, the first wireless communication device controls the control channel when the control channel is detected by the control channel detecting means. Receives the data transmitted on the channel. Then, when the received data is not the data from the legitimate partner device, the control channel priority detecting means is executed. In general, since an electric field exists everywhere, such an electric field, that is, noise, may be detected as an output of the control channel in detecting the control channel. If the noise is superposed and the valid control channel is output on another channel, if the noise is detected first, the detection of the valid control channel may be hindered. In other words, if the control channel detecting means and the call channel detecting means are always operated alternately, the call channel is detected after noise detection, and the loss time until the next valid control channel is detected is large. turn into.
The detection of a valid control channel during output becomes uncertain when the loss time becomes large due to changes in the radio wave condition and the output time. Therefore, if the data transmitted on the detected control channel is not the data from the legitimate device on the other side (noise is detected as the control channel), the control channel priority detection means is executed to execute the remaining undetected control channels. Immediately executing the detection of 1) has the effect of being able to reliably detect the control channel output from the legitimate partner device.

According to the wireless communication device of the third aspect, in addition to the effect of the wireless communication device of the second aspect, in the data reception by the first receiving means, the data reception time for each control channel is all control channels. Even if the data reception is executed, at least the total of the data reception time is set to be within the predetermined data output time of the partner device of the data transmission source. Therefore,
Even if data reception is executed for all control channels, it is possible to easily complete the reception of the required data within the predetermined data output time of the partner device of the data transmission source. Generally, when using multiple control channels, each control channel is detected by 1
Are sequentially executed for each control channel. Here, if the electric fields of all control channels exist in the vicinity, detection of all control channels is executed, but depending on the detection order,
The detection of legitimate control channels may be final.
In addition, the data transmission source device often can output data only for a predetermined time. However, even if data reception is executed for all control channels, at least the total data reception time is set within the predetermined data output time of the partner device of the data transmission source, so that all control channels are Even if the detection and the data reception are executed, it is possible to surely detect the legitimate control channel output from the partner device and form the communication link.

According to the wireless communication device of the fourth aspect, the second wireless communication device does not operate in the intermittent detection executed by the intermittent execution means when the control channel is detected by the second control channel detection means. The time is subtracted from that before the channel detection, and the detection of the remaining undetected control channels is executed. Therefore, in normal times, it is possible to reduce energy consumption due to the non-operation time created by performing the intermittent detection, and it is possible to perform the detection of the control channel at an appropriate timing.
Therefore, when using a plurality of control channels, it is possible to quickly detect the control channel that is being used (output from the partner device) and reliably form a communication link.

According to the wireless communication device of the fifth aspect, in addition to the effect of the wireless communication device of the fourth aspect, when the second wireless communication device detects the control channel by the second control channel detecting means. When the data transmitted on the control channel is received and it is recognized that the received data is not the data from the legitimate partner device, the operation changing means is executed. The electric field (noise) existing in the vicinity may be erroneously detected as a control channel. However, when multiple control channels are used, during detection of such erroneous control channel, other remaining control channels are legitimate. May be output from the other device. However, if the data transmitted on the detected control channel is not valid data from the other device (noise was detected as the control channel), the non-operation time is reduced from that before the channel detection and the remaining undetected control is performed. By executing the channel detection immediately, it is possible to reliably detect a valid control channel.

According to the wireless communication device of the sixth aspect, in addition to the effect of the wireless communication device of the fifth aspect, the second wireless communication device receives the data for each control channel in the data reception by the second receiving means. The time is set so that even if data reception is executed for all control channels, at least the total of the data reception times is within the predetermined data output time of the partner device of the data transmission source. Therefore, even if the data reception is executed for all control channels, it is possible to easily complete the reception of the required data within the predetermined data output time of the partner device of the data transmission source. . As a result, even if detection and data reception of all control channels are executed, it is possible to reliably detect a valid control channel output from the partner device and form a communication link.

According to the wireless communication device of the seventh aspect, in addition to the effect of the wireless communication device of the fifth or sixth aspect, the second wireless communication device can verify that the data received by the recognition means is valid. When it is recognized that the data is from the other device, the reception time of the data is changed from the normal reception time to the extended reception time. Therefore, it is possible to reliably receive the data transmitted from the legitimate device.

According to the wireless communication device of the eighth and ninth aspects, in addition to the effect of the wireless communication device of the seventh aspect, the first wireless communication device has all the second wireless devices connected by the control channel. The first identification information for identifying the first wireless communication apparatus and the second identification information for identifying the second wireless communication apparatus of the transmission destination are cyclically transmitted to the communication apparatus, while the second wireless communication apparatus transmits the transmission information. If the obtained first identification information is information from the legitimate partner device, the data reception time is changed from the normal reception time to the extended reception time. Then, the extended reception time is a time at which the second identification information addressed to the own device which is cyclically transmitted from the first wireless communication device can be received at least twice. Therefore, it is possible to reliably receive the first identification information and the second identification information transmitted from the first wireless communication device to the own device. Generally, when transmitting information by radio waves (control channel), the communication state depends on the surrounding environment. When the communication state deteriorates, the first identification information and the second identification information transmitted from the first wireless communication device cannot be received. However, in a normal environment, when radio waves are transmitted twice at intervals, there is a high probability that one of the radio waves will be detected. Therefore, the first wireless communication device cyclically transmits information to each second wireless communication device, and each second wireless communication device transmits at least two pieces of second identification information for the extended reception time to the own device. By setting the time that can be received once, the information transmitted to the own device can be surely received.

[Brief description of drawings]

FIG. 1 is an external perspective view of a parent-child telephone device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the parent-child telephone device.

FIG. 3 is a timing chart of control channel detection in the parent device.

FIG. 4 is a timing chart of control channel detection in a child device.

FIG. 5 is a flowchart of a control channel communication process executed by the master unit.

FIG. 6 is a flowchart of an A channel sniff process executed in the control channel communication process of the parent device.

FIG. 7 is a flowchart of a B channel sniff process executed in the control channel communication process of the parent device.

FIG. 8 is a flowchart of a slave unit control channel communication process executed by the slave unit.

FIG. 9 is a flowchart of a slave A channel sniff process executed in the slave control channel communication process.

FIG. 10 is a flowchart of a child device B channel sniff process executed in the control channel communication process of the parent device.

[Explanation of symbols]

1 Parent-child telephone device (wireless communication device) 1a Facsimile device, parent device (counterpart device,
First wireless communication device) 1b to 1d Cordless telephone device, cordless handset (counterpart device, second wireless communication device)

Claims (9)

[Claims] 1. A control channel detecting means for detecting a control channel for forming a communication link, and a communication for forming a communication link in synchronization with any of a plurality of control channels detected by the control channel detecting means. A first wireless communication device including link forming means and call channel detecting means for detecting a call channel for executing communication such as a call by the communication link formed by the communication link forming means. In the wireless communication device including the first wireless communication device, the first wireless communication device alternately operates the control channel detection means and the communication channel detection means, and in the detection of the control channel, the first control channel is detected at one detection timing. The alternate detection means for executing the detection of, and the control channel operated by the alternate detection means. Control channel priority detecting means for detecting the remaining undetected control channels in preference to the detection of the communication channel when one control channel is detected by the channel detecting means. Wireless communication device. 2. The first wireless communication device, when the control channel is detected by the control channel detecting means, receives first data transmitted by the control channel, and the first receiving means receives the data. 2. The wireless communication apparatus according to claim 1, further comprising: priority execution means for executing the control channel priority detection means when the obtained data is not data from a legitimate partner device. 3. The data reception time for each control channel in the data reception by the first receiving means is such that at least the total of the data reception time is the partner of the data transmission source, even if the data reception is executed for all the control channels. The wireless communication device according to claim 2, wherein the wireless communication device is set so as to be within a predetermined data output time of the side device. 4. A second control channel detecting means for detecting a plurality of control channels for forming a communication link, and one of the plurality of control channels detected by the second control channel detecting means. Second wireless communication that includes second communication link forming means that forms a communication link and intermittent execution means that causes the second control channel detection means to intermittently execute control channel detection In a wireless communication device including a device, the second wireless communication device uses a non-operation time in the intermittent detection performed by the intermittent execution means when the control channel is detected by the second control channel detection means. The wireless communication is characterized by comprising operation changing means for performing detection of the remaining undetected control channels after subtraction from that before detection. Apparatus. 5. The second wireless communication device, when the control channel is detected by the second control channel detecting means, second receiving means for receiving data transmitted on the control channel, and second receiving means thereof. Recognition means for recognizing whether or not the received data is data from a legitimate other party device, and the operation change when the recognition data is recognized as not being data from a legitimate other party device 5. The wireless communication apparatus according to claim 4, further comprising an operation executing unit that executes the unit. 6. The data reception time for each control channel in the second wireless communication device in the data reception by the second receiving means is at least that data reception time even if the data reception is executed for all control channels. 6. The wireless communication device according to claim 5, wherein the total of the above is set within a predetermined data output time of the other device of the data transmission source. 7. The second wireless communication device, when the data received by the recognizing means is recognized as data from a legitimate partner device, extends the data receiving time from the normal receiving time. 7. The wireless communication device according to claim 5, further comprising a reception time changing unit that changes the reception time. 8. A plurality of the second wireless communication devices as a partner device can be connected to the first wireless communication device, and the first wireless communication device is all connected by a control channel. Information transmitting means for cyclically transmitting to the second wireless communication device of the first identification information for identifying the first wireless communication device and second identification information for identifying the second wireless communication device of the transmission destination. In the second wireless communication device, when the first identification information transmitted by the information transmitting means is recognized by the recognizing means as information from a legitimate partner device, the receiving time changing means performs data acquisition. Is changed from a normal reception time to an extended reception time, and the extended reception time is the second identification addressed to the device itself cyclically transmitted from the first wireless communication device. At least the information The wireless communication device according to claim 7, wherein the wireless communication device has a time that can be received twice. 9. When the maximum number of connectable second wireless communication devices is connected to the first wireless communication device, all the second wireless communication devices are assigned the second extended reception time. 9. The wireless communication device according to claim 8, wherein it is a time when the identification information can be received at least twice.