JPH0226424A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To prevent a user's erroneous judgement on a receiving condition by setting a slave set in the same mode as the mode of a master set at that time when the power source switch of the slave set is switched ON. CONSTITUTION:When the power source switch of the slave set is switched from OFF to ON, a power source ON detecting circuit 2 detects it and outputs a power source ON signal to a pseudo connection circuit 3. The pseudo connection circuit 3 outputs a pseudo connection code set beforehand to the T data of a modem 4 synchronously with a T clock from the modem 4. The pseudo connection code is inputted to a pseudo connection response circuit 13 through a receiver 11 and a modem 12 on the side of the master set. The master set confirms a pseudo connection from the salve set, controls the slave set and thus, sets the slave set in the mode corresponding to the present mode of the master set. Thus, the erroneous judgement such as a mistake in the presence or absence of an incoming call and a misunderstanding as unanswerable can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cordless telephone in which a base unit and a slave unit are connected via wireless communication.

(Prior art) -II. In a cordless telephone, when there is an incoming call from the caller, the handset is called. However, if the power switch of the handset is in the OFF state at this time, , the handset does not respond, and the ring tone of the handset is not output. Therefore, since there is no response from the slave unit, the base unit stops calling the slave unit and outputs a ringtone itself.

(Problem to be Solved by the Invention) At this time, the user who heard the ring tone of the base unit turned on the power switch of the slave unit, but since the call from the base unit to the slave unit was stopped, In some cases, the ring tone was not output from the handset, leading to an erroneous judgment that the call had not been received or that the call could not be answered. There is also a method in which the parent device continues calling until the child device responds, but this is not a preferable method considering the traffic on the control channel.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned circumstances, and includes a cordless telephone in which a base unit and a slave unit are connected by wireless communication. The base unit includes: a power ON detection unit for detecting a power ON detection unit; and a pseudo connection unit for transmitting a pseudo connection signal for performing a pseudo connection with the base unit when the power ON detection unit detects an ON operation of a power switch; , comprising a pseudo-response means for responding to a pseudo-connection signal from the slave device, and a sending means for sending a status signal indicating a state of the base device to the slave device when the pseudo-response means responds to the pseudo-response signal. In response to this status signal, the child device is controlled to be in a mode corresponding to the current mode of the parent device.

(Function) When the power switch of the slave unit is switched from OFF to ON, the slave unit accesses the master unit using the pseudo connection means. The base unit confirms the pseudo connection from the slave unit using the pseudo response means, and controls the slave unit to set the slave unit to a mode corresponding to the current mode of the base unit.

As a result, when the base unit is in the incoming call mode, the slave unit also goes into the incoming call mode and outputs a ringtone, thereby preventing erroneous judgments such as misunderstanding whether there is an incoming call or misunderstanding that the call cannot be answered. It is also possible to display whether the call is on hold or in use on the base unit.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of a cordless telephone according to the present invention, in which (a) is a schematic block diagram of a handset, and (b) is a schematic block diagram of a base unit.

In the figure, 1 is a power supply circuit, 2 is a power ON detection circuit,
3 is a pseudo connection circuit, 4 is a modem, 5 is a transmitter, 6 is a receiver, 7 is a response setting circuit, 8 is a state holding circuit, and 9 is a state display circuit. Also, 11 is a receiver, 12 is a modem, 1
3 is a pseudo connection response circuit, 14 is a state holding circuit, and 15 is a transmitter.

FIG. 2 shows the power ON detection circuit 2 and the pseudo connection circuit 3.
This shows a more specific configuration. Further, FIG. 3 shows a timing chart of the same circuit.

That is, when the power supply 22 is turned on by the switch 21 [see FIG. 3(a)], the timer circuit 23 starts operating and generates a pulse signal SI with a constant time width T [see FIG. 3(b)].
Reference] is output. During this time T, the initial setting of the entire system is completed. One shot multivi break 2
4 is triggered by the fall of this pulse signal Sl [see FIG. 3(C)], and sets the transmitter 5 and the shift register 25. The shift register 25 is of a parallel input serial output type and has eight parallel input terminals, and these input terminals are numbered 2. Third. 4th. and the 7th input terminal is connected to ground, and the total voltage is 1011000.
1” 8-bit serial data [Pseudo connection code: Figure 3 (d
) is sent to the modem 4 from the serial output terminal Sθ. Further, a clock CK for shifting this 8-bit serial data is provided from the modem 4.

Next, the operation of the cordless telephone with the above configuration will be explained.

When the power switch (not shown) of the handset is switched from OFF to ON, the power ON detection circuit 2 detects this and outputs a power@oN signal to the pseudo connection circuit 3. Pseudo connection circuit 3
is operated by this power ON signal, and outputs the preset 8-bit pseudo connection code to the T data of the modem 4 in synchronization with the T clock from the modem 4, and also puts the transmitter 5 into a transmittable state. shall be. This pseudo connection code is sent out via the modem 4 and transmitter 5, and is input to the pseudo connection response circuit 13 via the receiver 11 and modem 12 on the base unit side.

When the pseudo connection response circuit 13 receives this signal, it creates a status response signal based on the information from the status holding circuit 14. This status response signal is sent out via the modem 12 and transmitter 15, and is inputted via the receiver 6 and modem 4 on the handset side to the response setting circuit 7 which has been conventionally provided. Then, the status of the base unit is determined, and the mode corresponding to the base unit is set in the status holding circuit 8, and this is displayed by the status display circuit 9 to inform the user of the current mode of the base unit and slave unit. Inform.

As a result, when the power switch of the slave unit is turned on, the slave unit is set to the same mode as the master unit at that time.

(Effects of the Invention) As explained above, according to the cordless telephone of the present invention, when the power switch of the handset is turned on, the handset is set to the same mode as the base phone at that time. It is possible to prevent a person from incorrectly determining the incoming call status.

[Brief explanation of the drawing]

FIG. 1 shows a schematic block diagram of a cordless telephone according to the present invention, in which (a) is a slave unit, (b) is a base unit, and FIG. 2 is a more detailed diagram of a power ON detection circuit and a pseudo connection circuit. FIG. 3 is a timing chart of the power ON detection circuit and the pseudo connection circuit. 5.15...Transmitter 6゜7...Response setting circuit 8゜9...Status display circuit 13...Pseudo connection response circuit 1...Receiver 4...Status holding circuit

Claims (1)

[Claims] 1) A cordless telephone in which a base unit and a slave unit are connected by wireless communication, wherein the slave unit has a power switch that detects an ON operation of a power switch.
N detection means, and pseudo-connection means that sends a pseudo-connection signal for performing a pseudo-connection with the master device when the power ON detection means detects an ON operation of a power switch, a pseudo-response means for responding to a pseudo-connection signal from a device; and a sending means for sending a status signal indicating a state of the base device to the slave device when the pseudo-response means responds to the pseudo-response signal; A cordless telephone set, wherein the base unit is controlled to be in a mode corresponding to the current mode of the base unit in response to the status signal.