JP2594187B2 - Wireless telephone equipment - Google Patents

Abstract

PURPOSE:To ensure the registration of a security code by devising the telephone set such that the security code is sent to a master set through a radio line section from a slave set. CONSTITUTION:When a slave set is placed onto a charger while an AC power supply is applied to the charger of a master set, a charge detection circuit 25 of the slave set detects it that a battery 23 of the slave set is in the charging state and the charge detection circuit 25 sends a detection signal to a microcomputer 26. A security code depends on a count of a counter 31 of the microcomputer 26 upon the receipt of the detection signal. The security code is sent to the master set through a prescribed channel via a transmission circuit section 36 and an antenna 35. The master set selects the channel for a prescribed period, and the security code is registered by having only to send a reply signal to the slave set upon the receipt of the security code from the slave set for the prescribed period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base unit connected to a general subscriber's telephone line unit, a slave unit capable of communicating with the master unit via a wireless line unit, and charging a rechargeable battery of the slave unit. , For example, a cordless telephone.

[0002]

2. Description of the Related Art In a wireless telephone device, for example, a cordless telephone used in the United States and the like, it is confirmed that a master unit and a slave unit are paired with each other, and a connection between the master unit and the slave unit is established. In order to prevent erroneous connection and erroneous billing, the security code is registered in the master unit and the slave unit. In this security code, normally, as shown in the data format of FIG. 5, 8 bits, that is, 256 kinds of codes are selectively used. Conventionally, there have been the following methods for registering a security code, for example.

A. Registering by Operating the Switch A mechanical switch is provided for each of the master unit and the slave unit, and the security code is hard-registered by operating this switch.

B. Registration Using Charger Terminals Data is transmitted and received between the parent device and the child device via the terminal of the charger, and the security code is registered in the parent device and the child device. This security code registration is updated to a new security code each time the slave unit is placed on the charger and stored in the memories of the master unit and the slave unit.

[0005] However, the former method has a problem in that the cost is increased due to the use of a mechanical switch, and there are many operations when changing the security code, and it is not easy to change.

On the other hand, the latter method requires a dedicated circuit for transmitting and receiving data between the master unit and the slave unit, which increases the cost. Also, since the security code is updated every time the slave unit is placed on the charger, the security code matches the security code of the other slave units, and the probability of erroneous connection or erroneous billing is high. There was a problem of becoming.

For this reason, a detection means for detecting that the slave unit is mounted on the charger and a start switch for security code registration are provided, and the slave unit is mounted on the charger. Within a certain time after detection by the detection means.
The applicant has previously filed a cordless telephone in which the security code is registered in the master unit and the slave unit when the switch is operated (Japanese Patent Application No. 3-592).
issue).

[0008] As in the above-mentioned application, the contents of the prior art for transmitting a security code from the master unit to the slave unit are as follows.
This will be briefly described with reference to FIG.

When the slave unit is mounted on the charger, the master unit detects that the battery of the slave unit is in the charged state by the charge detection circuit, and a detection signal is sent from the charge detection circuit to the microcomputer. . Microcomputer receiving this detection signal
The data controller controls the transmission circuit unit and waits for the security code registration start switch to be turned on within a predetermined time (for example, 8 seconds) counted by the microcomputer. If the registration start switch is set to the ON state within this predetermined time, the microcomputer sends a new security code determined by the timing of operating the registration start switch to a security code registration signal. And transmits the result to the slave via the transmission circuit unit and the antenna. Thereafter, when a response signal from the slave unit is received, a new security code is stored and registered in a data memory (RAM) in the microcomputer.

[0010] By the way, the security code is
When transmitting the data, the transmission channel is switched at predetermined intervals, for example, every 400 milliseconds, until the transmission channel matches the channel used by the slave unit. In order for the security code to be registered, the slave unit must receive the security code, transmit a response signal from the slave unit to the master unit, and the master unit must receive the response signal. However, this response operation matches the transmission channel of the parent device and the channel used by the child device.
Must be done in milliseconds. However, even if an attempt was made to perform such an operation within 400 milliseconds, the time was too late, and there was a high possibility that security code registration would fail. The time for switching channels on the master unit is set to a maximum of 8 seconds.
Since there is no channel, there is only a maximum of two chances that a signal can be responded to a desired channel. Therefore, if the registration of the security code has failed twice, the registration of the security code may not be updated.

A power cord of a charger (in a cordless telephone in which the charger is built in the base unit, a plug of a power cord of the base unit) is connected to a commercial AC power supply (AC). The slave unit is placed on the charger for the first time after the power is removed from the socket and inserted into the AC power socket, or after the power failure state is restored from the power failure state, that is, after the AC power supply to the charger is turned on. When the registration is performed, the new security code is immediately stored and registered in the data memory of the master unit and the slave unit without setting the registration start switch to ON within a predetermined time. May be. In this case, the time until the end of the security code registration operation becomes almost constant every time. However, the security code is
Since it is determined by the counter value of the counter of the microcomputer of the parent machine, there is a high possibility that the security code will be the same every time.

[0012]

SUMMARY OF THE INVENTION As described above, Japanese Patent Application No.
In the case of a cordless telephone that transmits a security code from the master unit to the slave unit as proposed in US Pat. No. 592, it is highly likely that registration of the security code will fail.

Further, when the security code is registered for the first time after the AC power supply to the charger is turned on, there is a high possibility that the same security code is registered every time. For this reason, there is a problem in that the probability of occurrence of erroneous connection or erroneous billing is high, which is consistent with the security code of other slave units.

[0014]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is characterized in that a security code is transmitted from a slave unit to a master unit through a wireless line unit.

[0015]

According to the present invention, the security code is transmitted from the slave unit, and the master unit transmits the security code at a predetermined period, for example, 4 seconds.
The channel is switched at a period of 00 milliseconds. During the period of 400 milliseconds, if a security code is received from the slave unit, an operation of merely transmitting a response signal to the slave unit is performed. You can register your code.

Also, at the same time as the battery is installed in the slave unit and the power is turned on to the microcomputer, the counter of the microcomputer starts counting operation. Therefore, when the slave unit is mounted on the charger, Alternatively, the security code is determined according to the count value of the counter of the slave unit when the AC power to the charger is turned on.

[0017]

1 and 2 show an embodiment of a master unit A and a slave unit B constituting a cordless telephone according to the present invention.

In FIG. 1 showing a master unit, 1 is an AC adapter for rectifying and smoothing a commercial AC power supply and converting it to a DC power supply. 2 is a charger provided integrally with the master unit A. 3 is a charger 2. The first charging terminal 4 is a charging detecting circuit as a detecting means for detecting that the slave unit B is mounted on the charger 2. Numeral 5 is an arithmetic control means, which is composed of, for example, a microcomputer of 4 bits per chip. The microcomputer 5 includes a program memory (ROM) 6, a data memory (RAM) 7, an IO port 8, a CPU 9, a counter 10, and the like. Reference numeral 11 denotes a security code registration start switch. Reference numeral 12 denotes a radio line unit, which includes a receiving antenna 13, a receiving circuit unit 14, and a transmitting antenna 1.
5 and a transmission circuit section 16. Reference numeral 17 denotes a circuit switching circuit, a ringer circuit, a keyboard, and the like for the master unit and the slave unit.
A main unit of the master unit including a handset (microphone and speaker) and the like, which is connected to a general subscriber telephone line unit 18. Reference numeral 19 denotes a backup battery at the time of a power failure;
Is a diode for preventing backflow, 22 is a transmitting / receiving circuit section 16,
14 is a power supply control circuit. Note that a rechargeable battery may be used as the backup battery 19.

On the other hand, in FIG. 2 showing the slave unit B, reference numeral 23 denotes a rechargeable battery, for example, a Ni-Cd battery, and reference numeral 24 denotes a second charging terminal connected to the positive and negative electrodes of the battery 23. By being placed on the charger 2, the first charging terminal 3 of the charger 2 comes into contact with the second charging terminal 24 of the slave unit B, and the charger 2
The charging battery 23 is charged through the charging terminals 3 and 24. Reference numeral 25 denotes a charge detection circuit as detection means for detecting that the slave unit B is placed on the charger 2. Numeral 26 denotes arithmetic control means, which is composed of, for example, a 4-bit microcomputer per chip. Microcomputer 26
Has a program memory (ROM) 27, a data memory (RAM) 28, an I / O port 29, a CPU 30, a counter 31, and the like. Reference numeral 32 denotes a wireless line unit, which includes a receiving antenna 33, a receiving circuit unit 34, a transmitting antenna 35, and a transmitting circuit unit 36. 37 is a handset (microphone and speaker), 38 is a transmission / reception circuit unit 36,3
4 is a power supply control circuit.

Each antenna of the master unit and the slave unit may use one antenna for transmission and reception.

Next, the operation when the security code is registered in the cordless telephone configured as described above will be described with reference to the operation explanatory diagram of FIG.

In the slave unit B, the battery 23 is mounted and the power is turned on to the microcomputer 26, and at the same time, the counter 31 of the microcomputer 26 starts the counting operation. When the slave unit B is placed on the charger 2 in a state where the AC power is supplied to the charger 2, on the slave unit B side, the battery 23 of the slave unit B is charged by the charge detection circuit 25. From the charge detection circuit 25 to the microcomputer.
The detection signal is sent to the data 26. The security code is determined according to the count value of the counter 31 of the microcomputer 26 when receiving this detection signal. This security code is transmitted to master unit A on a predetermined channel (for example, ninth channel) via transmission circuit unit 36 and antenna 35. This security code has a maximum of one.
Sent for 6 seconds.

On the other hand, when the slave unit B is placed on the charger 2 on the master unit A side, the charge detection circuit 4 detects that the battery 23 of the slave unit B is in a charged state. Sends a detection signal to the microcomputer 5. When the registration start switch 11 is operated within a predetermined time (for example, 8 seconds) from the time when the detection signal is received, the microcomputer 5 controls the reception circuit unit 13 to a reception state. At this time, since the communication channel may be different between the master unit and the slave unit, the master unit A switches the communication channel by +1 channel every 400 milliseconds (for example,
If the channel is the 10th channel when the switch 11 is turned on, 40
Every time 0 ms elapses, the channel is switched from the tenth channel to the first channel, the second channel,..., And the ninth channel. This operation is performed for a maximum of 8 seconds. During that time, if the security code matches the communication channel of the slave unit B and the security code is received from the slave unit B, the microcomputer 5 reads a new security code and responds. The signal is transmitted to the slave unit B via the transmission circuit unit 14 and the antenna 13, and a new security code is stored and registered in the data memory (RAM) 7. On the other hand, the slave B receives the response signal from the master A, and receives a new security message.
The code is stored in the data memory (R) in the microcomputer 5.
AM) 28 and registered.

Thus, the operation of registering the security code is completed.

As described above, the security code is transmitted from the slave unit, and the master unit transmits the security code at a predetermined period, for example, 4 seconds.
The channel is switched at a cycle of 00 milliseconds, and during the period of 400 milliseconds, if a security code is received from the slave unit, the operation is merely to transmit a response signal to the slave unit side. The likelihood of security code registration failure is reduced.

At the same time as the battery is mounted on the slave unit and the power is turned on to the microcomputer, the counter of the microcomputer starts counting operation, and the security code is changed to the microcomputer of the slave unit. Is determined by the counter value of the data. Therefore, when AC power is supplied to the charger,
When the slave unit is not mounted on the charger, the slave unit is mounted on the charger according to the counter value of the microcomputer of the slave unit when the slave unit is mounted on the charger. Is A
The security code is determined by the counter value of the microcomputer of the slave unit when the power is turned on. Therefore, even if the security code is registered for the first time after the AC power supply to the charger is turned on, the possibility that the same security code is registered as before is reduced.

Note that the security code changes in synchronization with the count value of the counter 31 of the microcomputer 26 of the slave unit B, and is counted up at a cycle of 250 microseconds. Therefore, the time required for one cycle of 256 security codes is 64 milliseconds. As described above, if the security code is always counted up at a cycle of 250 microseconds, the security code determined by the timing when the slave unit is placed on the charger or when the AC power is supplied to the charger is obtained. , May be the same as a previously registered security code.
Therefore, as one embodiment, if the security code is counted up even in the period of 1 millisecond in addition to the period of 250 microseconds, the security code becomes the same as the previously registered security code. Possibilities can be reduced.

That is, since the security code changes at a cycle of 250 microseconds, for example, the code "0,0,0,0,0,0,0" corresponding to decimal "0".
1 millisecond after the state of "0,0", the decimal number "4"
"0,0,0,0,0,1,0,0" corresponding to
become. On the other hand, since the security code changes even in a cycle of 1 millisecond, the code "0,0,0" corresponding to the decimal number "5" instantaneously from the binary number "4" after 1 millisecond.
0,0,0,1,0,1 ". After another two milliseconds, the code "0,0,0," corresponding to the decimal number "9"
The code instantaneously changes from "0, 1, 0, 0, 1" to the code "0, 0, 0, 0, 1, 0, 1, 0" corresponding to the decimal number "10". Similarly, the security code is 250
It changes in a cycle of a combination of microsecond and 1 millisecond.

As described above, in the above-described embodiment, the battery is mounted on the slave unit, the power is turned on to the microcomputer, and at the same time, the counter of the microcomputer of the slave unit starts the counting operation. Together with the first cycle (250
Microseconds) and a second period (1
(Milliseconds), the security code is changed. Therefore, even when the security code is updated, especially when the security code is registered for the first time after the AC power is turned on, the same security code as before is used. The probability of becoming a code is extremely small.

[0030]

According to the present invention, the security code is transmitted from the slave unit, and the master unit switches the channel at a predetermined period, for example, 400 milliseconds.
During the 0 millisecond period, the security
If the security code is received, the response signal is simply transmitted to the slave unit, so that the possibility of security code registration failure is reduced.

Also, at the same time as the battery is installed in the slave unit and the power is turned on to the microcomputer, the counter of the microcomputer of the slave unit starts counting operation. Even if the security code is registered for the first time, the same security code as before is used.
The likelihood of code being registered is reduced. Therefore, the probability of coincidence with the security code of another slave unit is extremely small.

[Brief description of the drawings]

FIG. 1 is a block diagram of a base unit constituting a wireless telephone device of the present invention.

FIG. 2 is a block diagram of a slave unit constituting the wireless telephone device of the present invention.

FIG. 3 is an operation explanatory diagram illustrating an operation of the wireless telephone device of the present invention.

FIG. 4 is an operation explanatory diagram illustrating an operation of a conventional wireless telephone device.

FIG. 5 is a format of data transmitted and received between a master unit and a slave unit of the wireless telephone device.

[Explanation of symbols]

 A Master unit B Slave unit 2 Charger 4, 25 Detection circuit 5, 26 Microcomputer 7, 28 Data memory 11 Start switch 12, 32 Wireless line section

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toruyuki Taniguchi 2-18-18 Keihanhondori, Moriguchi-shi Sanyo Electric Co., Ltd. (72) Inventor Makoto Ejima 2-18-18 Keihanhondori, Moriguchi-shi Sanyo Electric Co., Ltd. 56) References JP-A-3-210838 (JP, A) JP-A-2-7751 (JP, A) JP-A-1-218223 (JP, A) JP-A-60-223340 (JP, A)

Claims (2)

(57) [Claims] 1. A master unit connected to a general subscriber telephone line unit, a slave unit capable of communicating with the master unit via a wireless line unit, and a charger for charging a rechargeable battery of the slave unit. Detecting means for detecting that the slave unit is mounted on the charger; and a start switch for security code registration, wherein the detecting means indicates that the slave unit is mounted on the charger. A wireless telephone device in which when the start switch is operated within a predetermined time after the detection, a security code is registered in the master unit and the slave unit. The wireless telephone device is configured to be transmitted from the slave unit side to the master unit side through the wireless line unit. 2. The security code changes according to a counter value of a counter of the slave unit that operates from the time when a battery is attached to the slave unit, and changes a first cycle of the counter and the first cycle of the counter. 2. The wireless telephone device according to claim 1, wherein the wireless telephone device is configured to change in a combination of a second period longer than one period.