JPH08154123A - Cordless telephone set - Google Patents

Abstract

PURPOSE: To enable to use a slave unit immediately after power recovery without interruption of telephone service even when hit occurs during an energized hand-free communication state. CONSTITUTION: Whether or not power is supplied is judged periodically in a deenergized hand-free communication state S1 (S2). When the power is restored, a timer is started (S3). Then, whether or not a command came from a slave unit is judged in S4, shifted to S5 when there was a command and whether or not the transmitted command is an off-charge command is judged. When there is not, the transmitted command is executed in S6. When it is the off-charge command, whether or not on-charge signals are outputted is judged in S7, shifted to S8 when they are outputted, shifted to S9 when they are not outputted and the communication of a cordless telephone receiver is attained. In S8, whether or not fixed time passed after the start of the timer is judged. When it passed, shifted to S10 and the communication is ended. When it does not pass, S4 is repeated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless handset which is a slave unit dedicated to a master unit, and a cordless telephone which enables a loud voice call in the master unit, and more particularly, within a certain time after returning from a power failure state to an energized state. Related to data communication processing between the parent device and the child device.

[0002]

2. Description of the Related Art A cordless telephone equipped with a cordless handset, which is a child device of a base unit, cannot carry out a call during a power failure because it does not have a curl cord handset. In order to solve this problem, the base unit is equipped with a loudspeaker and a microphone that enable loudspeaking calls (hereinafter referred to as hands-free calls). Some hands-free calls allow external calls during power outages as well as during power outages. there were.

FIG. 3 shows a transition state of a hands-free call in such a conventional cordless telephone. As shown in the figure, during a hands-free call, even if the power is turned on / off, the call state of the master unit continues. Then, when the cordless handset is off-charged from the base unit in the energized state, the hands-free call is stopped and the call is switched to the cordless handset. In the hands-free call state shown in FIG. 3, the outside line is cut off by a key input, and the outside line is cut off by turning on the cordless handset during a call, and the telephone is in a standby state.

FIG. 4 shows the operation of the cordless telephone operating as described above when there is a momentary disconnection during the energized hands-free call state. If a power failure occurs during energized hands-free call, it switches to a power failure hands-free call as described above. At this time, since the terminal voltage of the master unit drops, the cordless handset makes an off-charge determination and sends an off-charge command to the master unit multiple times.

When the power is switched from the power failure to the energized state, the base unit again becomes the energized hands-free call, but after that, when the cordless handset sends an off-charge command, it is switched to the cordless handset call. However, when the power is turned on, a voltage is supplied to the charge terminal of the base unit, and the cordless handset determines that it is on-charge and sends an on-charge command after the cordless handset call. I will end up.

[0006] As described above, when the cordless handset is on-charged on the base unit and there is a momentary interruption during the hands-free call, the cordless handset is apparently off-charged and then on-charged. Since it is the same as, the telephone will be hung up.

[0007] In order to solve the above-mentioned problems, actually, measures are taken to prohibit the transmission and reception of all commands immediately after the power is turned on or immediately after the power is restored from the power failure. However, if you prohibit the sending and receiving of all commands,
For a while, there was a problem that the child machine could not be used.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to disconnect a telephone even when there is a momentary disconnection during an energized hands-free call state. It is to provide a cordless telephone in which the handset can be used immediately without turning on the power or immediately after the power is restored from the power failure.

[0009]

SUMMARY OF THE INVENTION A cordless telephone of the present invention is a cordless telephone having a cordless handset which is a slave unit of a master unit, a loud speaker and a microphone which enable a loud voice call in the master unit, and a power failure occurs. During a loud call, the off-charge command is received from the cordless handset within a certain period of time when the power is restored from the power failure state, and the off-charge command is received when the on-charge signal is detected from the charge terminal of the master unit. It is configured to be ignored.

[0010]

According to the cordless telephone of the present invention, during a voice call during a power failure, an apparent off-charge command is ignored and other commands are executed within a fixed period of time when the power is restored from the power failure state. Even if there is a disconnection, the phone will not be cut off, and the child device can be used immediately after the power is turned on or immediately after the power is restored from the power failure.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cordless telephone as an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a base unit of a cordless telephone according to an embodiment of the present invention. In the figure, 1 is an R for wireless communication with a slave unit.
RF module from the antenna (Radio
The frequency) signal is amplified and demodulated and output to the MSK modem 2 or the compressor IC 6, and the MS
RF signal from K modem 2 or compressor IC 6
The signal is modulated, further amplified and output to the antenna.

The MSK modem 2 is a microcomputer 3
The signal between the RF module 1 and the RF module 1 is modulated and demodulated by the MSK method (minimum shift keying). The charge detection circuit 4 outputs a signal indicating whether or not the cordless handset is on-charged to the microcomputer 3. The power failure detection circuit 5 outputs a signal indicating the energization or the power failure to the microcomputer 3.

The compressor IC 6 mutes a signal communicated between the RF module 1 and the speech IC 7 to prevent line noise leakage during a call. Speech IC
Reference numeral 7 mainly performs a switching operation between the line side and the receiver side, and switches a signal exchanged between the loudspeaker 8, the line, the RF module 1 and the microcomputer 3.

In the above-mentioned structure, a command which is output by some operation on the slave unit is taken into the microcomputer 3 via the RF module 1 and the MSK modem 2. The microcomputer 3 determines which operation is performed by which child device, and the MSK modem 2 and RF
A command is issued to the slave unit via the module 1 as a command.

Next, the operation during a power failure hands-free call will be described with reference to the flowchart of FIG. If a call is made during a power failure or if a power failure occurs during energization hands-free talking, the power failure hands-free call state of step S1 is set. At this time, step S2 is periodically executed to determine whether or not the power is turned on. When the power is turned on, step S3 is executed, the hands-free state is turned on, and the timer included in the microcomputer is started.

Next, the process proceeds to step S4, it is judged whether any command is transmitted from the slave unit, and if so, the process proceeds to step S5. In step S5, it is determined whether the transmitted command is an off-charge command from the cordless handset. If the command is an off-charge command, the process proceeds to step S7, and if not, the process proceeds to step S6.

In step S6, the transmitted command is executed. In step S7, it is determined whether or not the on-charge signal is output. If it is output, the process proceeds to step S8. If it is not output, step S8 is performed.
Move to 9. In step S9, a call is made using the cordless handset.

In step S8, it is determined whether or not a certain time has elapsed since the timer was started. If the time has elapsed, the process proceeds to step S10 to end the call. If not, step S4 is repeated.

[0019]

According to the cordless telephone of the present invention,
During a power failure during a hands-free call, the off-charge command from the cordless handset is ignored and other commands are executed within a certain period of time when the power is restored from the power failure state, so the call can be disconnected even if there is a momentary interruption. Also, immediately after the power is turned on or the power is restored from the power failure, commands other than the off-charge command are executed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a base unit of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the cordless telephone set.

FIG. 3 is a diagram showing a call transition state of a cordless telephone.

FIG. 4 is a time chart showing a command transmission state and a call state in the case where there is a momentary disconnection during energization hands-free call in a cordless telephone.

[Explanation of symbols]

 1 RF Module 2 MSK Modem 3 Microcomputer 4 Charge Detection Circuit 5 Power Failure Detection Circuit 6 Compressor IC 7 Speech IC 8 Loudspeaker 9 Microphone

Claims (1)

[Claims] 1. A cordless handset which is a child device of a parent device,
In a cordless telephone equipped with a loudspeaker and a microphone that enable loudspeaking in the base unit, during a loudspeaking call during a power failure, an off-charge command is received from the cordless handset within a certain period of time when the power is restored from the power failure state Moreover, the off-charge command is ignored when the on-charge signal is detected from the charge terminal of the master unit.