JPS6367951A - Calling subscriber selecting circuit for telephone system - Google Patents

Abstract

PURPOSE:To protect a telephone owner from a mischief call or a wrong call by generating a calling signal only when a DTMF signal transmitted from a calling subscriber after an incoming call operation coincides with a telephone number stored in a memory circuit. CONSTITUTION:If a calling signal is at a position where a selection switch 4 executes calling subscriber selecting operation, a message stored in a message memory circuit is outputted, and when a calling subscriber depresses a dial button for answering a telephone number, a DTMF signal is applied to a DTMF signal receiving circuit 26 through a 2nd diode bridge circuit 9, a hook control circuit 10 and a telephone set circuit 11 and a number stored in a receiving number memory circuit is collated with a telephone number stored in a memory circuit 18 by a number collating circuit 27. When both the numbers coincide with each other, a 2nd calling signal generating circuit 29 is driven and outputs a calling signal different from a calling sound generated from a 1st calling signal generating circuit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to telephone equipment, and more particularly to a caller selection circuit that protects the owner of the telephone against prank calls and mistaken calls.

(b) Conventional technology When a caller makes a call, a ring tone sounds in response to a ring signal coming from the telephone line, and by hearing the ring tone, the caller recognizes that there is an incoming call. I can do it. In such a configuration, the owner of the telephone is called not only in the case of a prank call but also in the case of a mistaken call, which is extremely unpleasant. As a way to solve this problem, a telephone device has been developed that is configured to ring only when a person who knows the PIN number makes a call.One such technique is, for example, Japanese Unexamined Patent Application Publication No. 1983-1981. There is one disclosed in Japanese Patent No. 11668. In addition, when making a call, manipulating the area code and the number of the other party is not only inconvenient, but also involves the problem of entering the wrong number. Many telephone devices equipped with a device called an automatic dialing device that allows calls to be made by operation are in widespread use, and one such technique is disclosed in Japanese Patent Publication No. 53-30601, for example.

(c) Problems to be solved by the invention In the technique of selecting a caller using a PIN number as described above, the PIN number is set by the telephone owner. There is also the problem that the caller forgets the PIN number. The present invention seeks to provide a caller selection circuit that solves this problem.

(d) Means for Solving Problems The caller selection circuit of the present invention outputs a calling signal when the DTMF signal sent from the caller after receiving a call matches the telephone number stored in the memory circuit. It was designed to emit sound.

(E) Function The present invention uses a telephone number stored in a memory circuit provided for automatic dialing as a password for selecting a caller.

(f) Embodiment The illustrated circuit is an embodiment of the caller selection circuit of the present invention. In the figure, (1) is a connection terminal with a telephone line;
(2) is the first rectifier that rectifies the calling signal arriving from the telephone line.
A diode bridge circuit (3) is a first ringing signal generating circuit that outputs a ringing signal in response to the ringing signal rectified by the first diode bridge circuit (2), (4) is a selection switch for selecting whether to activate or deactivate the caller selection operation, and the illustrated state is the inactive state. part> is a transformer (7) to which a ringing signal from the first ringing signal generation circuit (3) is applied to the first winding (6) when the selection switch (4> is in the inoperative position);
) is a speaker that emits a ringing signal, and is connected as a load to the second winding (8) of the transformer. (9) is a second diode bridge circuit provided to determine the connection polarity with the telephone line; (10) is a hook control circuit that controls the closing operation of the telephone line; (11)
is a telephone circuit called the speech network,
A handset (12) is connected. (13) is a dial operation button that can be activated during dial operation; (14> is a dial signal generation circuit that outputs a dial signal corresponding to the number forming the dial operation button (13); (15); <
16) and 17) are the 1st. The second and third operating switches (18) are memory circuits in which telephone numbers for automatic dialing are stored; (19) are memory circuits for storing telephone numbers in the memory circuit (18) corresponding to each of the operating switches; A control circuit (20) for controlling storage operation and telephone number calling operation is a control circuit that applies a signal output from the first calling signal generation circuit (3) when the selection switch (4) is in the selection operation position. terminal, and when a signal from the first calling signal generation circuit (3) is applied to the control terminal (20), the control circuit (19)
) is configured to perform each operation. (
21) is a hook operation control signal output terminal that is provided in the control circuit (19) and outputs a signal to control the operation of the hook control circuit (10), and when the signal is applied to the control terminal (20), It is configured to output a signal to close the telephone line when the telephone line is connected. (22) is a drive signal that is output after the telephone line is closed by the operation of the hook control circuit (10) based on the signal output from the hook operation control signal output terminal (21) of the control circuit (19). Drive signal -4=output terminal (23) is a response message sending circuit that becomes active when a drive signal is output to the drive signal output terminal (22), and sends a PIN number to the caller. It has the effect of sending out a message of encouragement. (24) is an input terminal provided in the control circuit (19) and into which a signal corresponding to the number of the dial operation button (13) is input when a telephone number is stored in the memory circuit (18);
(25) is an output terminal which is provided in the control circuit (19) and outputs the telephone number called up from the memory circuit (18) during automatic dialing operation, and is connected to the dial signal generation circuit (14). has been done. (26) is a signal sent from the caller as a PIN number, i.e. DTMF
This is a DTMF signal receiving circuit that receives signals, outputs coded signals to the control circuit (19), and also has a reception number memory circuit (built in the control circuit (19)).
(not shown) so that the signal is stored. (27) is activated after the hook control circuit (10) performs the closing operation, and the telephone number stored in the memory circuit (18) and the number stored in the received number memory circuit. This is a number matching circuit that performs matching with the numbers, and is equipped with an output terminal (28) that outputs an H (high) level signal when the numbers match. In such a circuit, the memory circuit (18) stores the subscriber number, city code, and area code;
The verification operation by the number verification circuit (27) is performed using, for example, the subscriber number, that is, the last four digits. (29) is activated when an H level signal is output to the output terminal (28) of the number matching circuit (27>), and the calling signal output from the first calling signal generation circuit (3>) is a second ring signal generation circuit that outputs a different ring signal (30);
is an amplifying circuit that amplifies the calling signal output from the second calling signal generating circuit (29), and the output signal is applied to the third winding (31) constituting the transformer (5) and the telephone. It is connected so that it is applied to the circuit (11). In such a circuit configuration, if the number successfully transmitted by the caller and the number stored in the memory circuit (18) do not match, the hook control circuit (10) is reset after a predetermined period of time to disconnect the telephone line. Configured to release closure.

In addition, if the handset (12) is lifted while the speaker (7) is emitting a ringing signal that is fully output from the second ringing signal generating circuit (29), the second ringing signal generating circuit (29) becomes inoperable. As described above, the caller selection circuit of the present invention is configured such that:
Next, the operation of such a circuit will be explained.

First, the operation of storing a telephone number in the memory circuit (18) will be explained. Such a memory operation is performed by switching the first . Operate the second and third operation switches (15), (16), and (17), respectively, and press the dial operation button (
13). Further, the response message sending circuit (23) has a built-in message memory circuit in which a response message is stored, and the voice of the owner of the telephone is memorized by the message storage operation. The response message is stored as, for example, "Yes, this is ○○. Please send your telephone number."

As described above, the memory circuit (13) stores the telephone number and the response message.Next, the operation as a telephone device will be explained.First, the operation when making a telephone call will be explained.Memory Circuit (1
When making a call to a person whose phone number is not stored in 8), the call is made by removing the handset (12) from the telephone and operating the dial operation button (13).

When the handset (12) is removed from the telephone, a hook switch (not shown) is switched, as is well known, to close the telephone line. In this state, when a dial operation button (13) is operated, a dial signal corresponding to the operation button is output from the dial signal generation circuit (14) and sent to the telephone line through the telephone circuit (11). The operation when making a call using the dial operation button (13) is performed as described above, but next, the case where a call is made by automatic dialing operation will be explained. Such an operation is
an operation switch (15) provided corresponding to a memory in which the telephone number of the person to be called is stored when the handset (12) is removed from the telephone;
This is done by manipulating (16) and (17). For example, when the first operating switch (15) is pressed and closed, the telephone number stored in the memory corresponding to the first operating switch (15) among the telephone numbers stored in the memory circuit (18) will be changed. The dial signal is called and applied to the dial signal generating circuit (14). As a result, a dial signal corresponding to that number is generated by the dial signal generating circuit (14).
) and sent to the telephone line through the telephone circuit (11). After such an operation is performed, a telephone call can be made.

As mentioned above, the operation when making a phone call is performed, but
Next, the operation when a caller receives a call will be explained. First, a description will be given of a case where the selection switch (4) for selecting operation/inoperation of the caller selection operation is in the non-operation position shown, that is, a case where the telephone operates as a normal telephone device. When a calling signal arrives from the telephone line in the illustrated state, the calling signal is applied to the first calling signal generating circuit (3) through the first diode bridge circuit (2). As a result, the first calling signal generating circuit (3) becomes operational, and an electronically distorted calling signal is output to its output terminal. The calling signal output from the first calling signal generating circuit (3) is applied to the first winding (6) constituting the transformer (ρ) through the selection switch (4). As a result, the transformer (5) and the speaker (
A ringing signal is induced in the second winding (8) to which 7) is connected as a load, and a ringing tone is emitted from the speaker (7). Therefore, the owner of the telephone will be aware of the incoming call, and by removing the handset (12) from the telephone, the telephone line will be closed and the caller will be able to speak. I can do it.

As described above, operations are performed when operating as a normal telephone device, but next, operations are performed when the selection switch (4) is in the operating position opposite to the illustrated state, that is, the position where the caller selection operation is performed. I will explain about it. When a calling signal arrives from the telephone line when the selection switch (4) is in the operating position, the first calling signal generating circuit (3)
A calling signal is output. In such a state, the signal path to the first winding (6) constituting the transformer is completely cut off by switching the selection switch (4), so a ringing tone is emitted from the speaker (7). The calling signal output from the first calling signal generating circuit (3) is applied to the control terminal (20) provided in the control circuit (19) through the selection switch (4>), and the
9) is started. The control circuit (19
) When a call signal is applied to the control terminal (20) of the control circuit (19), a signal for performing a closing operation is output to the hook operation control signal output terminal (21) provided in the control circuit (19), and the hook control The circuit (10) performs a telephone line closing operation. After such a closing operation is performed, the control circuit (
A drive signal is applied to the drive signal output terminal (22) provided in the output terminal (19) to the output failure response message transmission path (23). When a drive signal is applied to the response message output path (23), the response message output circuit (23)
becomes operational, the message stored in the message memory circuit, that is, the message "Yes, this is XX. Please send your phone number, please." is output, and the telephone circuit (11) to the calling party. When a caller who has heard such a message operates a dial button that responds to a telephone number, a signal corresponding to each button, that is, a DTMF signal, is sent to the telephone line. The DTMF signal sent from the calling party passes through the second diode bridge circuit (9), the hook control circuit (10) and the telephone circuit (11) to the DTMF signal receiving circuit (26).
> is applied.

When a DTMF signal sent from the calling party is applied to the DTMF signal receiving circuit (26), the DTMF signal receiving circuit (26) outputs a coded signal corresponding to the number and sends it to the control circuit (26). 19) can be entered.

The coded signal input to the control circuit (19) is stored by a received number memory circuit built into the control circuit (19).The number stored in the received number memory circuit and the memory circuit A comparison operation with the telephone number stored in (18) is performed by a number verification circuit (27).The number stored in the received number memory circuit and the number stored in the memory circuit (18) are If they match, an H level signal is output to the output terminal (28) of the number verification circuit (27), and this signal is applied to the second calling signal generation circuit (29).As a result, the second The ringing signal generation circuit (29) is activated, and a ringing signal different from the ringing tone from the first ringing signal generation circuit (3) is output. The call signal is input to the amplifier circuit (30), amplified, and then sent to the third circuit constituting the transformer (ρ).
is applied to the winding (31). Therefore, the transformer (small)
A ringing signal is induced in the second winding (8) which constitutes the main body and to which the speaker (7) is connected as a load, and is emitted as a ringing tone by the speaker (7). and,
When such a calling operation is being performed, the amplifier circuit (3
0) second calling signal generation circuit (29) amplified by
Since the calling signal is sent to the calling party through the telephone circuit (11), the calling party can recognize that a calling operation is being performed. The owner of the telephone can not only recognize that there is a call by the ring tone emitted from the speaker (7), but also recognize the difference in the ring tone when the caller is selected. It is possible to recognize that After performing such recognition, when the telephone owner removes the handset (12) from the telephone, the number verification circuit (27) and the second ring signal generation circuit (29) become inoperable and the communication with the caller is interrupted. A call will be made. In this way, when the number sent by the calling party matches the telephone number stored in the memory circuit (18), a ringing operation is performed using a ringing signal outputted from the second ringing signal generation circuit (29). , if there is no matching number, the output terminal (28) of the number matching circuit (27)
Since no H level signal is output to the second paging signal generation circuit (29), the second paging signal generation circuit (29) is never activated. Then, after a predetermined period of time has elapsed, a signal for unclosing the telephone line is output to the hook operation control signal output terminal (21) provided in the control circuit (19), and the hook control circuit <10>
An unclosing operation is performed. In this way, if you receive a call from someone whose phone number does not match the phone number stored in the memory circuit (18), the speaker (7) will not emit a ringing tone, resulting in a prank call or mistaken call. can be excluded.

In this embodiment, a case has been described in which three telephone numbers are stored for automatic dialing, but the number is not limited to three. In addition, although the dialing operation is performed by operating a single button, the telephone number is checked against the telephone number stored in the memory circuit provided for dialing. In a telephone device that calls a telephone number stored in a memory circuit by performing the above steps, it is also possible to perform verification with the telephone number stored in the memory circuit. Although the response message is stored in the memory circuit as the response message sending circuit (23), it is also possible to use a tape recorder.

(G) Since a ringing signal is emitted when the effect of the invention is met, it is possible to protect the owner of the telephone from prank calls and mistaken calls, and also to automatically dial the PIN number for selecting the caller. Since the telephone number stored in the memory circuit provided for performing the operation is used, the calling party does not forget the PIN number, and the present invention is advantageous when selecting a specific calling party. This has a very large effect.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the caller selection circuit of the present invention. Explanation of main drawing numbers (3)...First ringing signal generation circuit, (4)...Selection switch, (mutual)...Transformer, (7)...Speaker, (10)... Hook control circuit, (11)・
...telephone circuit, (12) ... handset, (13)
...Dial operation button, (14)...Dial signal generation circuit, (18)...Memory circuit, (19)
...Control circuit, (23>...Response message sending circuit, (26)...DTMF signal receiving circuit, (2
7)... Number verification circuit, (29>... Second calling signal generation circuit.

Claims (1)

[Claims] (1) Equipped with an automatic dialing device that sends a dialing signal by calling a telephone number stored in a memory circuit, and a D that is sent by the caller after receiving a call.
In a telephone device equipped with a device that emits a ringing signal when a number corresponding to a TMF signal and a password match,
A caller selection circuit for a telephone device, characterized in that a telephone number stored in the memory circuit is used as a password.