JPS63253747A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To prevent mis-operation by devising the device that a DC loop to an exchange via a trunk line is opened when a slave set is located to a pre scribed position of a master set in the talking state. CONSTITUTION:A contact detection means 16 outputting a contact detection signal in detecting the contact between a charge current output terminal 18 and a charge current input terminal 33 and a means 10 opening the DC loop formed via a trunk line L with the exchange in receiving the contact detection signal, are provided. In placing the slave set 30 to a prescribed position of the master set in the talking state, the terminals 18, 33 are contacted and the contact detection signal is outputted from the means 16. Based on the signal, the DC loop with the exchange via the trunk line is opened. Thus, the operation of the end of call is the same as a general telephone set having a hook switch and the possibility of mis-operation is precluded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cordless telephone device that transmits and receives signals between a telephone device main body (base unit) and a handset (slave unit) by wireless means.

[Conventional technology]

A cordless telephone device does not have a hook switch like a normal telephone, and instead of a hook switch, a slide switch is provided on the handset to switch between the standby state and the talking state. . Therefore, when you receive a call, you can make a call by switching the slide switch from "standby" to "call".
To end the call, the slide switch is returned from "call" to "standby" to return to standby. The reason why a manual switch is used instead of a hook switch in this way is to enable the handset to enter the standby state even when the slave is away from the base. With this configuration, it is possible to make a call or respond to an incoming call while the slave unit is separated from the base unit, and the cordless telephone device can be used more conveniently.

[Problem that the invention seeks to solve]

However, the method of operating a telephone having a hook switch has become quite common in general, and it is not uncommon for people to follow this method unconsciously. In other words, with a cordless telephone device that does not have a hook switch, it is necessary to switch the manual switch from the talking state to the standby state when the call ends, but without performing this switching operation, simply move the handset to the specified position of the device A. You may think that just by placing it in a place, the standby mode has changed.

If such an erroneous operation is performed, the DC loop formed with the central exchange will remain in place even after the call ends, making it impossible to receive the next call.

[Means for solving problems]

The cordless telephone device of the present invention has been made in view of the above problems, and includes a contact detection means that outputs a contact detection signal when it detects that the charging current output terminal and the charging current input terminal are in contact with each other, and When a detection signal is input, the system is equipped with means for opening a DC loop formed with the exchange via a central line.

[Function] ゛When the handset is placed in a predetermined position on the base unit during a call, the charging current output terminal of the base unit and the charging current input terminal of the slave unit come into contact, and a contact detection signal is output from the contact detection means. Based on this contact detection signal, the DC loop formed with the exchange via the central line is opened.

〔Example〕

Hereinafter, the present invention will be described in detail along with examples.

FIG. 1 is a block diagram showing one embodiment of the present invention. A telephone line (office line) L is connected to the communication circuit 2 of the base unit 1 via a rectifying diode bridge 3 and a dial pulse sending transistor 4. The communication circuit 2 is a 2-wire 4
This is a circuit that performs line conversion, and is connected to the wireless transmitter/receiver section 7 via a signal line 5 for receiving calls and a signal line 6 for sending calls. The wireless transmitter/receiver 7 includes a transmitter, a receiver, a portion of a synthesizer, and a duplexer, and performs wireless communication with the wireless transmitter/receiver 31 of the 30 child devices.

An incoming call detection circuit 9 is connected to the telephone line in parallel with the communication circuit 2 via a diode bridge 8, and its output signal line is connected to the CPU10 that controls the entire base unit 1.

The base unit 1 includes a power supply circuit 12 connected to an AC power source via an AC adapter 11, and a wireless transmitter/receiver 7.
Various circuits in the main unit 1, including the main unit 1, are driven by receiving power from the power supply circuit 12. In addition, this power supply circuit 1
Reference numeral 2 supplies charging current also to the battery 32 built in the handset 30, and is connected to the charging current output terminal 18 via the current detection circuit 16 and diode I7. The power supply circuit 12 is connected to a back-up nozzle 13 for use in the event of a power outage, a power lamp 14, and a voltage detection circuit 15 for detecting a power outage, thereby taking measures against power supply abnormalities such as power outages.

Charging current is supplied from the power supply circuit 12 to the battery 32 of the handset 30 when the handset 30 is placed at a predetermined location on the base unit 1, and the charging current output terminal 18 of the base unit 1 and the charging current input terminal 33 of the slave unit are connected to each other. By connecting the slave unit 30 to the base unit 1, the supply of charging current is stopped. Therefore, the contact state between the charging current output terminal 18 and the charging current input terminal 33 can be detected by the detection output of the current detection circuit 16. The output signal line of this current detection circuit 16 is connected to CPU10.

In addition, a dial IC 19 transmits a dial pulse (DP) by driving and controlling the transistor 4 based on dial information from the handset 30 (given via the CPU 10), a signal tone for generating a ringer tone, etc. An antenna 21 for wireless communication with the generator 20 and the handset 30
etc. are provided.

On the other hand, the handset 30 is also provided with a wireless transmitter/receiver 31, to which a piezoelectric receiver 35 and a condenser microphone 37 are connected via a receiving signal line 34 and a transmitting signal line 36, respectively. Through this communication between the wireless transmitting/receiving section 31 and the wireless transmitting/receiving section 7 of the base unit 1, the piezoelectric receiver 35 and the condenser microphone 37 operate as if they were directly connected to the R terminal and the T terminal of the communication circuit 2, respectively. Become.

A resistor 38 is connected between the battery 32 and the charging current input terminal 33.
．． A voltage detection circuit consisting of 39 is provided, and its detection output is given to the CPU 40 which controls the overall control of the slave device 30. Similar to the current detection circuit 16 of the base unit 1, this voltage detection circuit functions as a means for detecting whether or not the charging current output terminal 18 and the charging current input terminal 33 are in contact with each other, and detects the detected voltage. If it is not zero, it means that they are in contact. The voltage detection circuit 41 is connected to the battery 3
2, and its output signal line is also connected to the CPU 40. Note that the diode 42 is for preventing backflow, and the diode 43 functions as a power lamp.

The handset 30 includes an operation section 44, which is provided with a numeric keypad, as well as function keys such as a speed dial key, a call key, a hold key, and an end key. The speed dial key is literally the key you operate when setting speed dials, the call key is the key to switch the standby state to the talking state when a call arrives, the hold key is the key to put the call state on hold, and the end key is the key to switch from the call state to the waiting state. Uke is the key to force a switch to a state. Note that a signal based on the operation of the operation unit 44 is input to the CPU 40, and processing is performed according to the content of the signal. Further, a signal based on the operation of the operation unit 44 is transmitted from the CPU 40 to the wireless transmitting/receiving unit 3 as necessary.
The data is also sent to the CPU 10 on the base unit 1 side via 1 and 7, and predetermined processing is executed on the base unit 1 side.

In addition, the slave device is provided with a signal tone generator 45, an antenna 46, and the like.

Next, operations related to call termination and hold in this embodiment will be explained using the flowchart of FIG. 2.

This flowchart shows the operation of CPU10 of base unit 1. During a call, the presence or absence of an output from a hold key press operation and the presence or absence of an output from the current detection circuit 16 are constantly monitored (steps 101, 102, and 103). From this state, when the slave unit 30 is placed at a predetermined location on the base unit 1 and the charging current output terminal 18 and the charging current input terminal 33 come into contact, a detection output is sent from the current detection circuit 16.

In CPU10, when this detection output is input (step 1
03), Opening the DC loop formed between the communication circuit 2 and the exchange on the central office side via the telephone line (
Step 104).

On the other hand, if it is detected that the hold key of the operation unit 44 has been pressed during a call (step 102), the central office line is put on hold (step 105), and it is subsequently monitored whether an operation to release the hold is performed (step 105). Step 106). The hold release operation is achieved by pressing the hold key on the operation unit 44 again. In this way, release of hold is performed exclusively by operating the hold key, so if the handset 30 is combined with the base unit 1 after pressing the hold key, and the charging current output terminal 18 and the charging current input terminal 33 are brought into contact with each other. However, the pending state will remain as is.

When the hold key is pressed again and the hold is released, the call state returns again and steps 101 to 104 are performed as described above.
Execute the process up to.

In this embodiment, the contact state between the charging current output terminal 18 and the charging current input terminal 33 is detected by the current detection circuit 16 provided on the main unit 1 side, but the contact state between the charging current output terminal 18 and the charging current input terminal 33 is detected by the current detection circuit 16 provided on the main unit 1 side. The separation state may be detected by a voltage detection circuit consisting of .39.

Furthermore, the present invention allows the call state to be switched to the standby state by pressing the end key on the operation unit 44, without having to integrate the slave device 30 with the base device 1, as in the present embodiment. It does not prevent

〔Effect of the invention〕

As explained above, according to the cordless telephone device of the present invention, when the handset is placed in a predetermined position of the base unit during a call, the charging current output terminal of the base unit and the charging current input terminal of the slave unit come into contact with each other. , This contact opens the DC loop formed with the exchange via the central line. Therefore, the operation at the end of a call is the same as that of a general telephone with a hook switch, and the possibility of erroneous operation is almost eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart of the embodiment when a call is received. l...Base unit, 2...Telephone circuit, 7,31...Wireless transmitter/receiver section, 9...Incoming call detection circuit, 10.40...C
PU, 12...power supply circuit, 16...current detection circuit,
18...Charging current output terminal, 33...Charging current input terminal.

Claims (1)

[Claims] It consists of a base unit connected to the central office line of the exchange and a slave unit connected to the base unit via a wireless communication path.The base unit is equipped with a terminal for outputting charging current, and the slave unit In the cordless telephone device, the cordless telephone device is provided with a terminal that contacts the charging current output terminal and inputs the charging current when the charging current output terminal and the charging current input terminal are connected. A cordless telephone device comprising contact detection means for outputting a detection signal, and means for opening a DC loop formed between the exchange and the exchange via the central office line when the contact detection signal is input.