JPH03167945A - Releasing device for originating call of cordless telephone set - Google Patents

Abstract

PURPOSE:To attain the transmission from a master set to a slave set without need of changeover operation of a changeover switch by manual operation by automatically releasing the originating call when a telephone set installed in parallel is hooked off in the case of the originating call mode inhibiting the dialing from the slave set. CONSTITUTION:When a call comes from a telephone line 18 in the originating call mode and a handset of a telephone set installed in parallel is lifted up and hooked off, since a signal current is led to the telephone set from the telephone line 18, a current flows to a photodiode 9a being the primary side device of a photocoupler 9. Thus, a transistor(TR) 7a is nonconductive. Thus, even when a changeover switch 8 is thrown to the position of the originating call mode, a data transmission circuit 6d sends a mute OFF signal releasing the operation restriction to form a channel between a master set 1 and a slave set 10. Thus, the talking between the slave set 10 and an opposite telephone set via the master set 1 is attained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a parent-child type cordless telephone, and in particular, the present invention is directed to a parent-child type cordless telephone, in particular, by lifting the calling restriction that makes it impossible to make calls from the handset, The present invention relates to a device for releasing restriction on outgoing calls for a cordless telephone equipped with a function that allows forwarding to other parties.

(Prior art) As a conventional cordless telephone equipped with an attached telephone, it can be switched to either a call mode that forms a communication path between the base unit and the handset, or a call restriction mode that restricts outgoing calls on the handset side. Cordless telephones with possible switching functions are known. In this type of cordless telephone, the switching switch is operated manually, and when the switching switch is switched to the call mode side, it is possible to talk between the handset and the other party's phone via the base unit. It looks like this.

Also, if you switch to call restriction mode, you can use the attached telephone, but calls from the handset are restricted.
The handset cannot be used without permission. (Problem to be solved by the invention) However, when this type of cordless telephone is set to call restriction mode, the communication path between the base unit and the handset is not established, so the attached telephone is taken off-hook and calls are made. There was a problem in that even if it became necessary to transfer data to the slave device while using the device, the data could not be transferred to the slave device immediately. In addition, this switch is manually operated, so if you forget to switch back to call restriction mode after the call is over when you switch to call mode, for example, calls from the handset may be interrupted. The problem remained that the use of the handset remained enabled, making it impossible to prohibit the use of the handset. The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to enable the handset to communicate with the handset without the need for manual operation when the attached telephone goes off-hook when the handset is restricted from making outgoing calls. An object of the present invention is to provide a device for releasing restriction on outgoing calls for a cordless telephone, which enables the transfer of calls.

(Means for Solving the Problems) In order to solve the above problems, a cordless telephone call restriction release device according to the present invention includes a base unit connected to a telephone line, and a base unit connected to the base unit via a wireless line. a switching means for switching to either a call mode for forming a communication path between the base unit and the handset or a call restriction mode for restricting outgoing calls from the handset; In a cordless telephone equipped with a parallel telephone connected in parallel, a detection circuit detects off-hook of the attached telephone, and a detection signal from the detection circuit when the switching means is switched to the outgoing call restriction mode. Based on the invention, there is provided a transmission restriction release circuit that cancels the transmission restriction mode when the detection signal indicates off-hook, and returns to the transmission restriction mode when the detection signal indicates on-hook; The present invention employs a structure including a control means for forming a communication path between the base unit and the slave unit when the restriction on outgoing calls is lifted. (Function) With the above structure, when the switching means is switched to the call mode,
A communication path is established between the base unit, handset, and 7, and it becomes possible to talk between the other party's phone and the handset via the base unit. Furthermore, by taking the attached telephone off-hook, it becomes possible to talk between the attached telephone and the other party's telephone. On the other hand, when the switching means is switched to the outgoing call restriction mode, outgoing calls are restricted, making it impossible to make calls from the handset. When an incoming call is received from the telephone line in this outgoing call restriction mode, when the attached telephone goes off-hook, the detection circuit detects this off-hook and outputs a detection signal. The call restriction release circuit releases the call restriction of the handset based on this detection signal. Along with this, the control means establishes a communication path between the base phone and the handset, making it possible to transfer calls from the attached telephone to the handset.

It also becomes possible to talk between the handset and the other party's telephone.

After this, when the attached telephone is turned off, the base unit returns to the outgoing call restriction mode, and calls made from the slave unit are no longer possible.

(Example) An example of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the electrical structure of a base unit and a slave unit of a cordless telephone according to the present invention. In Fig. 1, 1 is the base unit, 10 is the slave unit, and the base unit 1
and the handset 10 are connected via a wireless line E.

A telephone line 18 is connected to the input side of the line section 2 of the main unit 1, and an attached telephone (not shown) is connected via a signal line 19. Further, the output 201 of the line section 2, which sends out an incoming signal from the telephone line l8, a call signal after the line is connected, etc., is led to the transmitting section 3, and the output of the transmitting section 3 is connected to the antenna 5. ．． Further, the antenna 5 is connected to the receiving section 4, and the output of the receiving section 4 is guided to the line section 2. The receiving unit 4 receives a dial signal etc. sent from the handset 10 side via the antenna 5, and
It is sent to the line section 2 side.

Further, the control section 6 that controls the operation of each section is bidirectionally connected to the line section 2, the transmitting section 3, the receiving section 4, and the calling restriction release circuit 7. Control signals are output to each part based on signals from the transmission restriction release circuit 7 and from the transmission restriction release circuit 7. A signal line 701 from an attached telephone is led to the input of the call restriction release circuit 7.
The transmission restriction is canceled based on a detection signal from a detection circuit 9 (described later) shown in FIG. 2. This signal indicating cancellation of the transmission restriction is guided to the changeover switch 8. The changeover switch 8 is used to switch between a call mode that establishes a communication path between the other party's telephone and the handset 10, and a call restriction mode that restricts calls made from the handset 10, and its output is as follows. It is guided to the control section 6.

On the other hand, the receiving section 12 of the handset 10 is connected to an antenna 11 that performs wireless IE with the antenna 5 of the base device 1, and the output of the receiving section 12 is connected to the speaker l3. Further, the output of the transmitting section 14 to which the output of the microphone 15 is connected to the input side is connected to the antenna 11.

A control unit 16 that controls the operation of each unit is bidirectionally connected to the receiving unit 12 and the transmitting unit l4, and
Dial key 17 that emits a dial signal for human power of 6
output is connected.

FIG. 2 is an electrical circuit diagram showing the configuration of the main parts of the parent device 1 having the above structure.

In the figure, 18 is a surge absorber connected in parallel to the telephone line, and a rectifier circuit 19 is connected to the connection point at both ends of the surge absorber.
The internal circuit of the main unit 1 is connected through the terminal, and the input side of an attached telephone (not shown) is also connected thereto. 9 is a photocoupler which is a detection circuit, and a photodiode 9
It consists of a phototransistor 9b and a phototransistor 9b, and is designed to detect off-hook caused by picking up the attached telephone and output a detection signal. Further, the changeover switch 8 for switching between the call mode and the outgoing call restriction mode is connected to the power supply voltage ■ via a first contact 8a, a second contact 8b, and a resistor R2. . The second contact 8b is connected to the collector of a transistor 7a constituting the transmission restriction release circuit 7. That is, when the switching contact 8C is manually switched to the first contact 8a side, the call mode is set, and when the switching contact 8C is switched to the second contact 8b side, the calling mode is set.

Also, a transistor 7a that constitutes the transmission restriction release circuit 7
The base of is connected to the collector of the phototransistor 9b via a current limiting resistor R3, and the base of the resistor R4
It is connected to ground via a resistor R1, and to VDD via a resistor R1. Further, the emitter of the transistor 7a is connected to ground.

As shown in FIG. 3, the control section 6 controlled by a microcomputer is composed of a transmission restriction detection circuit 6a, a reception data detection circuit 6b, a control circuit 6C, and a data transmission circuit 6d. The input port A connected to the input of the transmission restriction detection circuit 6a is connected to the switching contact 8c of the switching switch 8, and is also connected to the power supply voltage VDD via a resistor R2. Further, the output of the receiving section 4 of the base unit 1 is connected to the input port B, which is connected to the input of the received data detection circuit 6b. Further, the control circuit 6c outputs various control signals based on detection signals from the transmission restriction detection circuit 6a and the received data detection circuit 6b, and the control signals from the control circuit 6c are transmitted to the data transmission circuit 6d, The signal is sent to the transmitting section 3 and the receiving section 4 via the output port C.

Next, the operation of the above-described transmission restriction release device will be explained.

First, when a call is to be made between the handset 10 and the other party's telephone, the operator switches the switching contact 8c of the switching switch 8 to the first contact 8a side. Then, the power supply voltage VDIll is applied to the input port A of the control circuit 6 via the resistor R2, so that the potential of the input port A changes to the "H" level. As a result, the control unit 6 determines that the mode is an operation mode in which call restriction is not applied. In other words, input capo}
When A becomes "H" level, the transmission restriction detection circuit 6a sends a transmission restriction signal to the control circuit 6C. The control circuit 6c controls the data transmitting circuit 6d in response to this signal. I
Outputs I signal. Along with this, the data transmitting circuit 6d sends a normal operation signal, that is, a mute OFF signal for canceling the operation restriction, to the transmitting section 3 and receiving section 4 of the parent and machine I. As a result, the operation restriction of the base unit 1 is lifted, so when a call is received from the other party's telephone through the telephone line 18, the communication path is established between the handset 10 and the other party's telephone via the base unit 1. and becomes ready to talk. Also,
If the annexed telephone is off-hook in this call mode, it becomes possible to talk between the annexed telephone and the other party's telephone.

On the other hand, when restricting calls from the base unit 1 and restricting calls from the handset 10, the switching contact 8c of the switching switch 8 is connected to the second contact 8.
Switch to side b. That is, the power supply voltage v0 is applied to the collector of the transistor 7a. On the other hand, the power supply voltage V is applied to the base of the transistor 7a through resistors Rl and R3. . is being applied, the transistor 7a is in a conductive state, so the current that had been supplied to the input port A until then flows to the ground via the collector electrode ξ. As a result, the potential of the input port A, which was at the rHJ level, changes to the "L" level, so the control unit 6 determines that this is the operation mode in which transmission is restricted. That is, input port A is rL
When the J level is reached, the transmission restriction detection circuit 6a controls the control circuit 6.
A transmission restriction signal is sent to C, and the control circuit 6C sends a control signal in response to this signal. That is, even if a signal for connection to the telephone line, that is, an outside line capture signal is sent from the handset 10 side, a control signal for not operating the transmitting section 3 and receiving section 4 is sent to the data transmitting circuit 6d. Along with this, the data transmission circuit 6a transmits the data to the base unit 1.
A mute ON signal is sent to the transmitting section 3 and receiving section 4 to restrict their operation. As a result, the base unit is forcibly maintained in the OFF state, so even if a call is received from the telephone line 18, the call cannot be transferred from the base unit 1 to the slave unit 10. Further, by making a call from the handset 10 side, it becomes impossible to talk to the other party's telephone via the base unit 1. Note that even in this calling restriction mode, it is possible to make a call between the attached telephone and the other party's telephone.

By the way, when there is an incoming call from the telephone line l8 in such call restriction mode, if you pick up the attached telephone and go off-hook, a signal current is led from the telephone line 18 to the attached telephone, so that the photocoupler 9, which is the primary side of the photocoupler 9, A current flows through the diode 9a. As a result, the photocoupler 9 is turned on, and current flows through the phototransistor 9b on the secondary side. Since this phototransistor 9b is connected to the base of the transistor 7a,
The base of transistor 7a, which was at rHJ level, becomes “L”.
'' level, and the transistor 7a becomes non-conductive. Therefore, even if the connection of the changeover switch 8 is in the transmission restriction mode side (that is, the state in which the changeover contact 8c and the second contact 8b are connected), the power supply voltage van is applied to the transistor through the resistor R2 and the changeover switch 8. Since the voltage is no longer applied to the side 7a, the input voltage A of the control unit 6 is again connected to the resistor R.
Power supply voltage VD+, is applied through port 2, and the potential at input port 8, which was at rLJ level, changes to rHJ level. Along with this, a transmission release signal is sent from the transmission restriction detection circuit 6a as described above, and the control circuit 6C outputs the restriction a signal in response to this signal, so that the data transmission circuit 6d releases the operation restriction. ξU} OFF
A signal is sent out. That is, even if the changeover contact 8C of the changeover switch 8 is connected to the second contact 8b side and the call restriction mode is set, a communication path between the base unit 1 and the handset 10 is formed. Therefore, a state is reached in which communication between the slave unit 10 and the other party's telephone via the base unit 1 is possible.

Then, in such a state where the transmission restriction is canceled (that is, the connection of the changeover switch 8 remains on the transmission restriction side and the transmission restriction is canceled by forcibly turning off the transistor 7a), When the telephone is turned on and off, the signal current from the telephone line 18 to the attached telephone is stopped, so the photocoupler 9 is turned off, the transistor 7a becomes conductive again, and the transistor 7a becomes conductive. Therefore, the power supply voltage VDD is again led to the ground via the resistor R, 2, the switching switch 8, and the collector emitter of the transistor 7a, so that the input port A of the control unit 6 is connected to rL again.
It changes to J level and returns to the above-mentioned normal call restriction mode.

(Effects of the Invention) According to the device for canceling call restriction for a cordless telephone according to the present invention, when an attached telephone is off-hook in the call restriction mode that disables outgoing calls from a handset, based on the off-hook detection signal, Since we have configured the system to automatically cancel call restrictions, it is possible to transfer calls from the base unit to the slave unit without having to manually change the switch.
It is also possible to make calls from the handset. In addition, there is no need for complicated operations to cancel the call restriction mode, and there is also no need to switch the cordless phone from the call mode to the call restriction mode again, making handling operations easier. It has the effect of becoming.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a block diagram showing the electrical structure of the base unit and handset of a cordless telephone, and FIG. 2 is a block diagram showing the structure of the main parts of the base unit. FIG. 3 is a block diagram showing the electrical structure of the control section. ...Main unit...Control unit...Outgoing restriction release circuit...Selector switch...Detection circuit (photocoupler)...Slave unit 1 length buried

Claims (1)

[Claims] 1) A base unit connected to a telephone line, a slave unit connected to the base unit via a wireless line, and a call mode in which a communication path is formed between the base unit and the slave unit. Or, in a cordless telephone equipped with a switching means for switching to any one of the call restriction modes that restrict outgoing calls from the slave unit, and a parallel telephone connected to the telephone line in parallel with the base unit, the cordless telephone is equipped with a telephone connected to the telephone line in parallel with the base unit, and the attached telephone is off-hook. a detection circuit that detects, when the switching means is switched to set the transmission restriction mode, based on a detection signal from the detection circuit;
A transmission restriction release circuit that releases the transmission restriction mode when the detection signal indicates off-hook and returns to the transmission restriction mode when the detection signal indicates on-hook; 1. A device for canceling call restriction for a cordless telephone, comprising: control means for forming a communication path between the base unit and the handset when the restriction is lifted.