JPS63252031A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To eliminate the need for manual operation from a stand-by state to a speech state by forming a DC loop to an exchange when there is incoming and entering the speech state automatically. CONSTITUTION:When there is incoming in the stand-by state, a CPU 10 decides the separation state between a master equipment 1 and a slave equipment 30 from whether or not a current detecting circuit 16 generates it output. At this time, when the slave equipment 30 is separated, a speech channel is set between radio transmission and reception parts 7 and 31. Namely, the incoming signal is sent out to the slave equipment 30 over a control channel and the speech channel is set after an answer is made by the slave equipment 30. Then the DC loop to the office-side exchange is formed through a telephone line L by a speech circuit 2 and the speech state is entered. The stand-by state is entered by depressing the end key 44 of an operation part 44 at the end of a speech.

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 footer switch, a slide switch is provided on the handset to switch between the standby state and the talking state. . Therefore, for example, when there is an incoming call, the user can make a call by switching the slide switch from "standby" to "talk". The reason why a manual switch is used instead of a hook switch is to enable the handset to enter the standby state even when the handset is away from the base. With this configuration, it is possible to make a call or respond to an incoming call while the handset is separated from the base, and the portability of the handset can be further improved.

[Problem that the invention seeks to solve]

However, switching between ``standby'' and ``talk'' using such a manual switch literally requires manual operation, which has the disadvantage that responding to an incoming call is especially troublesome.

[Means for solving problems]

The cordless telephone device of the present invention has been made in view of the above problems, and includes an incoming call detection circuit that outputs an incoming call detection signal when an incoming call is detected, and the charging current output terminal and the charging current input terminal are separated. separation detection means for outputting a separation detection signal when detecting that an incoming call is present; logical product means for logically multiplying the incoming call detection signal and the separation detection signal; and means for forming a DC loop between the station and the station via a central line.

[Effect]

When an incoming call is received while the base unit and the slave unit are separated, an incoming call detection signal and a separation detection signal are applied to an AND circuit, and an AND output is sent out. Then, based on this AND output, a DC loop is formed with the exchange, and a conversation is automatically established. In addition, when the handset receives an incoming call while the handset is combined with the base phone, an incoming call detection signal is given to the AND circuit, and then when the handset is separated from the handset, a separate detection signal is sent to the AND circuit. is given, and an AND output is sent out from the AND circuit. Therefore, as described above, a DC loop is formed and a communication state is established.

〔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 10 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 part of a synthesizer, and a duplexer, and performs wireless communication (a) with the wireless transmitter/receiver 31 on the handset 30 side.

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 a charging current to a battery 32 built in the handset 30, and is connected to a charging current output terminal 18 via a current detection circuit 16 and a diode 17. Note that the power supply circuit 12 is connected to a backup battery 13 in case of a power outage, a power lamp 14, and a voltage detection circuit 15 for detecting a power outage, and measures against power supply abnormalities such as a power outage are taken.

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 detection output of the current detection circuit 16
It is possible to detect whether or not the base unit 0 is separated from the base unit 1. In this way, the output signal line of the current detection circuit 16, which functions as a means for detecting the separation of the slave units 30 and 1, is
It is connected to the CPU 10.

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. This voltage detection circuit, like the current detection circuit 16 of the base unit 1, functions as a means for detecting whether or not the base unit 1 and the slave unit 30 are separated, and even if the detected voltage is zero, It can be seen that they are separated. The voltage detection circuit 41 is a means for detecting whether the battery 32 is exhausted, 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, an end key, and a hold key.

The speed dial key is literally a key operated when setting speed dial, the end key is a key to end a call from a call state and put the call into standby mode, and the hold key is a key to put the call state on hold.

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

Next, the operation of this embodiment when responding to an incoming call will be explained using the flowchart shown in FIG. This flowchart is CP
This shows the operation of Ul0.

In this device, the standby state is the basic state, and it is always waiting for an incoming call from the other party (step 101,
102). When an incoming call is received, a ringing sound is emitted, and it is determined whether or not the current detection circuit 16 is exposed, and based on this, the separation state of the base unit 1 and the slave unit 30 is determined (step 103
). That is, if the charging current is detected in the current detection circuit 16, it means that the handset 30 is placed at a predetermined location on the base unit 1 and the terminals 18 and 33 are connected to each other, and conversely, the charging current must be detected. In other words, the two are separated. At this time, if the handset 30 is separated, or
If they are already in a separated state, then a communication channel is set between the wireless transmitting/receiving units 7 and 31 (step 104).
). The setting of this call channel is performed in the same manner as in the past, in which an incoming signal is sent to the handset 30 via the control channel, and after receiving a response from the handset 30, the call channel is set. . Next, the communication circuit 2 forms a DC loop with the exchange on the central office side via the telephone line (step 105), and enters into a communication state (step 1).
06). When the call ends, the user presses the end key on the operation unit 44 to enter the standby state.

In this embodiment, the separation state between the parent unit and the slave unit is detected by the current detection circuit 16 provided on the base unit 1 side, but the voltage detection circuit consisting of, for example, a resistor 38° 39 on the slave unit 30 side The separation state may also be detected by

〔Effect of the invention〕

As explained above, according to the cordless telephone device of the present invention, when an incoming call is received with the base unit and handset separated, the AND circuit inputs the incoming call detection signal and the separation detection signal, and the DC Since a loop is formed and the call state is automatically established, there is no need to manually switch from the standby state to the call state, making it extremely easy to use. In addition, if you receive an incoming call while the handset is combined with the base phone, you can disconnect the handset from the base phone to make a call. Calls can be made.

[Brief explanation of the drawing]

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. DESCRIPTION OF SYMBOLS 1... Base unit, 2... Call circuit, 7.31... Radio transmitting/receiving 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 combined, an incoming call detection circuit that outputs an incoming call detection signal when an incoming call is detected;
separation detection means for outputting a separation detection signal when detecting that the charging current output terminal and the charging current input terminal are separated; and logical product means for taking a logical product of the incoming call detection signal and the separation detection signal; , means for forming a DC loop with the exchange via a central office line based on the logical output of the logical product means.