JPH0616606B2 - Wireless phone - Google Patents

Description

Description: TECHNICAL FIELD [0001] The present invention relates to a wireless communication for connecting to a connection device connected to a wired circuit via one call channel selected from a plurality of call channels to perform a call. Regarding phones.

[Technical background of the invention]

FIG. 4 is a block diagram showing the conventional configuration of this type of wireless telephone device, which is roughly divided into a connection device 1 and a wireless telephone 2. The connection device 1 communicates with the wireless telephone 2 via a wireless line, and performs call connection control for exchanging a call signal between a communication channel for communication and a wired telephone line (hereinafter referred to as a wired circuit) 3. Then, the transmitter 10, the receiver 11, the transmitting antenna 12, the receiving antenna 13, the control circuit 14,
A carrier detection circuit 15 and a timer 16 are provided, and connection control with the wired line 3 is performed depending on whether or not the transmitter 10 and the receiver 11 are activated, and communication with the wired telephone 2 is performed by the transmitter 10. , Receiver 11 and transmitting antenna 12, receiving antenna
Performed by 13. In this case, when the communication telephone from the wireless telephone 2 is cut off, this is the carrier detection circuit 15
The detection signal is input to the control circuit 14. Then, the control circuit 14 activates the timer 16. After the timer 16 is started, if the communication radio wave from the wireless telephone 2 is interrupted even after the timer time has elapsed,
The control circuit 14 controls the transmitter 10 and the receiver 11 in an inactive state, and the call connection between the communication channel of the wireless telephone 2 and the wired line 3 is forcibly disconnected.

On the other hand, the wireless telephone 2 includes a transmitter 20, a receiver 21, a transmitting antenna 22, a receiving antenna 23, a control circuit 24, a reset circuit 25, and a battery 26 for power supply, and communication with the connection device 1 is performed by the transmitter 20. , Receiver 21, transmitting antenna 22, receiving antenna
By 23. In this case, the communication channel with the connection device 1 is constituted by a plurality of communication channels, and a communication with the wired line 3 is performed by selecting one communication channel. For this purpose, the control circuit 24 has a memory (not shown) for storing a channel number during a call.
Is built in. This wireless telephone 2 operates by the voltage from the battery 26, but if the battery 26 is replaced, the control circuit 24 will reset the reset circuit 25 when a new battery 26 is installed.
To return to the initial state.

With such a configuration, the conventional wireless telephone device can communicate with a wired line.

[Problems of background technology]

However, when replacing the battery 26 during a call, the control circuit 24
The call channel number stored in the built-in memory is also lost, and the connection with the wired circuit 3 is forcibly cut off due to the interruption of the communication radio wave, so the call is interrupted and the other station is called again. There was a problem that the operation was required.

[Object of the Invention]

The present invention eliminates such drawbacks, and even if a battery is exchanged during a call, for example, the call state before the battery exchange can be maintained, and after the battery exchange, the call can be resumed using the same call channel. The purpose is to provide.

[Outline of Invention]

The present invention makes a call through one call channel selected from a plurality of call channels, and forcibly disconnects the call channel unless radio waves of the call channel are continuously received for a predetermined time or longer. In the wireless telephone to
A power supply for supplying electric power, a storage means for storing information indicating the selected call channel, a detection means for detecting whether or not the power supply is supplied by the power supply, and a power supply for the detection means. And a channel forming unit that forms a communication channel based on the information stored in the storage unit when power supply is restarted within the predetermined time after it is detected that the communication channel has not been detected. To do.

Further, according to the present invention, a call is made by connecting to a connection device connected to a wired line via one call channel selected from a plurality of call channels, and the connection device transmits the radio wave of the call channel. In a wireless telephone that forcibly disconnects the call channel if it is not continuously received for a predetermined time or longer, a power supply battery, a storage unit that stores information indicating the selected call channel, and a voltage that detects the voltage of the power supply battery. Detection means, backup power supply means for generating a predetermined power supply voltage for at least the predetermined time after the voltage of the power supply battery is detected to be equal to or lower than a predetermined voltage by the voltage detection means, and The communication channel stored in the storage means is held by the power supply voltage generated from the backup power supply means, and the backup power supply is stored. The power supply voltage generated from the means is supplied to the transmitter in a cycle shorter than the predetermined time, the transmitter transmits the electric wave of the communication channel stored in the storage means intermittently, And a control unit for restarting a call using the call channel stored in the storage unit when it is detected that the output of the power supply battery is restored.

Example of Invention

FIG. 1 is a block diagram showing an embodiment of the radio telephone 2 which is an essential part of the present invention. The memory back-up power supply circuit 27, the power supply voltage detection circuit 28 and the timer 29 are different from the conventional configuration.
Is newly provided.

The memory backup power supply circuit 27 includes a control circuit 24, a power supply voltage detection circuit 28 and a timer when the battery 26 is removed.
A power supply voltage is supplied to the diode 29. For example, as shown in FIG.
It is composed of a capacitor 271 having a capacity charged through 0.

The power supply voltage detection circuit 28 detects that the battery voltage has dropped rapidly when the battery 26 is removed. At this time, the timer 29 is started and the stored contents of the internal memory of the control circuit 24 are held. Perform required actions. Further, the power supply voltage detection circuit 28 detects that the output voltage of the new battery 26 has risen rapidly when a new battery 26 is installed,
The timer 29 is reset by outputting a detection signal indicating the installation of a new battery.

The timer 29 monitors whether or not the battery 26 has been replaced within a fixed time.If the reset signal is not given from the circuit 28 within the fixed time, the reset circuit 25 generates a reset signal and the control circuit Return 24 to the initial state. However, when the reset signal is given from the circuit 28 within a fixed time, that is, when the replacement of the battery 26 is completed within the timer time of the timer 29, the reset circuit 25 is deactivated and the control circuit 24 is initialized. Instead of returning to the state, the call state before replacement of the battery 26 is returned.

Therefore, in such a configuration, if the replacement of the battery 26 is completed within the timer time of the timer 29, the call channel number stored in the memory in the control circuit 24 is determined by the output voltage of the backup power supply circuit 27. The call is held, and thereafter, the call on the call channel before the battery replacement is connected according to the held call channel number.

The reason why the call state before the exchange is not returned when the exchange of the battery 26 has passed for a certain period of time is that the connection device 1 is used when the radio wave from the wireless telephone 2 is interrupted for a certain period of time or more.
This is because the call channel is forcibly disconnected by this.

FIG. 3 is a block diagram showing another embodiment of the present invention.
Switches 30 and 31 and a timer 32 shown in FIG. 2 are further added to the configuration shown in FIG. 1, and when the battery 26 is installed, the switch 30 is turned on by the control of the control circuit 24 so that the transmitter
The power supply voltage is supplied to 20, but when the battery 26 is removed, the switch 31 is turned on so that the backup power supply circuit 27 sends the transmitter power.
The power supply voltage is supplied to 20 during the timer time of the timer 32. In this case, the carrier detection circuit 15 of the connection adapter 1 determines whether the second timer 32 has the timer time.
Is set to a time (for example, about 10 ms) that can detect the radio wave transmitted from, and shorter than the timer time (for example, about 30 seconds) of the first timer 29.

Therefore, in this embodiment, the power supply voltage is intermittently applied to the transmitter 20 at the time interval determined by the timer time of the second timer 32 during the timer time of the timer 29, during which the connection device 1 is connected. The transmitted radio waves are intermittently transmitted to. Therefore, the timer time of the second timer 32 is set to the timer of the connection device 1.
If you set it slightly shorter than the timer time of 16, you can extend the forced disconnection time of the connection device 1 longer.
The time until the end of the exchange can be further extended.

As the backup power supply circuit 27, a small capacity secondary battery may be used instead of the capacitor. In addition, the radio waves transmitted from the wireless telephone 2 intermittently are transmitted by the transmitter 20.
If the automatic output control circuit is controlled to be smaller than the normal output, the capacity of the backup power supply circuit 27 can be reduced, which is effective. Further, although the control circuit 24 is configured to return to the initial state by the reset circuit 25, it may be returned to the initial state by utilizing the fact that the output of the capacitor of the backup power supply circuit 27 decreases with time. Good.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, when replacing the battery, the memory for storing the call channel number is backed up for a fixed time, and if the battery is replaced within the fixed time, the call channel before the exchange is completed. Since the call state is returned to, the battery can be replaced without interrupting the call state, the recall operation of the partner station can be omitted, and the operability is further improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the main part of the present invention, and FIG. 2 is a diagram showing an example of a power supply circuit for memory backup.
FIG. 3 is a block diagram showing another embodiment of the essential part of the present invention,
FIG. 4 is a block diagram showing the configuration of a conventional wireless telephone device. 1 ... Connection device, 2 ... Wireless telephone, 3 ... Wired telephone line, 20 ... Transmitter, 24 ... Control circuit, 27 ... Memory backup power circuit, 28 ... Power voltage detection circuit, 29 , 32
...... Timer, 30, 31 ...... Switch.

Claims (2)

[Claims] 1. One selected from a plurality of communication channels
While making a call through one call channel, if you do not receive the radio wave of the call channel continuously for a predetermined time,
In a wireless telephone that forcibly disconnects the call channel, a power supply for supplying power, storage means for storing information indicating the selected call channel, and detection of whether or not power is supplied by the power supply When the power supply is restarted within the predetermined time after the detection means detects that the power is not supplied, the call channel is set based on the information stored in the storage means. And a channel forming means for forming the wireless telephone. 2. One selected from a plurality of communication channels
A radio that connects with a connection device connected to a wired line via one call channel to make a call, and forcibly disconnects the call channel unless the connection device continuously receives the radio wave of the call channel for a predetermined time or longer. In a telephone, a power supply battery, a storage unit that stores information indicating the selected call channel, a voltage detection unit that detects the voltage of the power supply battery, and a voltage of the power supply battery that is predetermined by the voltage detection unit. Stored in the storage means by the backup power supply means for generating a predetermined power supply voltage for at least the predetermined time after it is detected that In addition to holding the call channel, the power supply voltage generated from the backup power supply means is transmitted to the transmitter for the predetermined time. When the transmitter detects that the output of the power source battery has been restored by intermittently transmitting the radio wave of the communication channel stored in the storage means from the transmitter by supplying the signal in a shorter cycle. And a control unit that resumes a call using the call channel stored in the storage unit.