JP2989574B2 - Cordless telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a cordless telephone.

[0002]

2. Description of the Related Art Conventionally, in a low power type cordless telephone, when calling a slave unit from a master unit, a calling range is within about 100 m from the master unit, and an out-of-range warning sound is issued to a slave unit outside the 100 m range. It was not possible to make a call simply by letting us know.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cordless telephone capable of calling and communicating with a handset outside a range of 100 m.

[0004]

In order to achieve the above object, the present invention provides a cordless telephone comprising a base unit connected to a telephone line and a handset that can be wirelessly connected to the base unit. In order to call the slave unit to the master unit,
Based on the operation of the line button and the extension button, determining means for determining whether the slave unit is within the cordless signal reach range or out of the cordless signal reach range, and based on the determination result by the determiner, The first transmission signal is directly transmitted when it is determined that the cordless handset is within the cordless signal reach range, and a call request is made via the telephone line when it is determined that the cordless handset is outside the cordless signal reach range. And a communication control unit for transmitting the second transmission signal by performing the first and second transmission signals. The first reception unit receives the first transmission signal and the second reception unit receives the second transmission signal. And a notifying means for making a call notification based on the signal received by the first receiving means or the second receiving means.

Therefore, according to the present invention, the extension button
When the remote control is operated,
It is determined that it is within the cordless signal range of the base unit
When the communication control means directly transmits the first transmission signal,
While calling the slave unit, the judgment unit determines that the slave unit is the master unit.
Is determined to be out of the cordless signal range
Communication control means makes a call request through a telephone line.
Causes the second transmission signal to be transmitted indirectly by the
The slave unit to send the cordless signal of the master unit.
Extension button on the parent machine, regardless of whether it is within range
Operation can reliably call the slave unit.
In addition, it is possible to suppress unnecessary communication charges in that case.
Wear.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of a cordless telephone according to the present invention will be described below with reference to FIG. In addition, 1
Is a main part block circuit diagram of the parent machine, and 2 is a main part block diagram of the child machine.

[0007] In the parent device 1, a certain child device 2 in the system
When a call is made, the extension button and the button corresponding to the handset 2 are pressed to transmit a handset calling signal from the control circuit 3 to the FSK (frequency shift key) circuit 4, and the transmission circuit 5 converts the signal into a 380 MHz band signal. The signal is converted and transmitted as a transmission signal A from the antenna 8.

[0008] In the slave unit 2, the transmission signal A is received by the antenna 9, transmitted through the reception circuit 10,
A demodulation circuit 11 including an IF amplifier demodulates a calling signal,
The data is transmitted to the control circuit 14 and processed to produce the sounding body 18.
Generates a ring tone.

At the same time, an instruction to generate an incoming call detection signal is input from the control circuit 12 to the FSK circuit 13,
A data signal is generated from the K circuit 13, converted into a 254 MHz band signal by the transmission circuit 14, and transmitted as a transmission signal B from the antenna 9 to the base unit 1.

In the base unit 1, the signal B from the sub unit 2 is received by the antenna 8, demodulated by the demodulation circuit 7 via the receiving circuit 6, and detected by the control circuit 3 by the control unit 3. When the determination is made, the communication channel between the master unit 1 and the slave unit 2 is closed, and a call can be made.

On the other hand, when the handset 2 is out of the cordless signal reachable range from the base unit 1, the base unit 1 cannot receive an incoming call detection signal from the handset 2, so that a cordless extension call with the handset 2 is established. It is impossible, and the call of the child device cannot be notified. In this case, base unit 1 requests pager calling via a telephone line (external line), and causes handset 2 having a wireless calling service contract to transmit pager signal C in the 380 MHz band.

In the slave unit 2, when the pager signal C is received by the antenna 15, the receiving circuit 1
The demodulated signal is demodulated by a demodulation circuit 17 via a reception circuit 16 having a modulation factor different from 0, a pager signal is processed by a control circuit 12, and a ringing tone is emitted from a sounding body 18.

[0013]

As described above, according to the present invention, the master unit
When the extension button is operated, the slave unit
-Directly when the device is within the dress signal range
While the slave unit is in the cordless signal range of the master unit.
If you are outside, you have already
By indirectly calling the child device using existing services
In the case of the parent device user, the child device
Without recognizing whether or not you are within
Button to reduce unnecessary communication charges.
While calling the user of the slave unit,
Greatly deviated from the cordless signal range of the base unit
Even if the
it can.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part of a cordless telephone according to the present invention.

[Explanation of symbols]

 1 parent machine 2 child machine

Claims (1)

(57) [Claims] A parent device 1. A connected to a telephone line, in a cordless telephone comprising a parent machine by wireless by connectable to the slave unit, to the master unit, and the extension button for calling the said child machine, the Judgment means for judging whether the cordless handset is within the cordless signal reach range or outside the cordless signal reach range based on the operation of the extension button, based on the judgment result by the judging means, If it is determined that the vehicle is within the reach,
Communication control means for directly transmitting a transmission signal, and transmitting a second transmission signal by making a call request through a telephone line when the slave unit is determined to be out of the cordless signal range. A first receiving means for receiving the first transmission signal; a second receiving means for receiving the second transmission signal; and a signal received by the first receiving means or the second receiving means. And a notifying means for making a call notification based on the telephone.