JPS63109632A - Caller selection circuit for telephone system - Google Patents

Abstract

PURPOSE:To protect the possessor of a telephone set from a mischievous call or wrong dial by sending a call signal when a number corresponding to a DTMF signal sent from a caller after incoming operation is coincident with an identification number. CONSTITUTION:A signal sent from a caller as the identification number, that is, a DTMF signal is received by a DTMF signal reception circuit 32, which is connected to output a coded signal to a control circuit 25. A reception number memory circuit 33 storing a received number by the DTMF signal reception circuit 32 and a number collation circuit 34 or the like collating the number stored in the memory circuit 33 are provided. When the number corresponding to the DTMF signal sent from the caller after the incoming operation and the identification number are coincident, a call signal is outputted and the operation of a timer circuit 5 switches the operation/nonoperation of the caller selection operation is selected. Thus, the possessor of the telephone set is protected form a mischievous call or a wrong dial.

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 the ringing signal coming from the telephone line, and by hearing this ring tone, the caller recognizes that there is an incoming call. The telephone device is now fully configured.

With a telephone device having such a configuration, the owner of the telephone will be harassed not only by prank calls but also by mistaken calls, which is very unpleasant. As a way to solve this problem, a telephone device has been developed that is configured so that it will ring only when a person who knows the PIN number calls. There is something that has been fully disclosed in Publication No. 11668.

(c) Problems to be solved by the invention Although the above-mentioned technology can protect the owner of the phone from prank calls and mistaken calls, the operation of selecting the caller is performed at night while the user is sleeping. Since the switching operation is often performed in this way, it is necessary to perform the switching operation every day, which is inconvenient and also causes the problem of forgetting the switching operation. The present invention seeks to provide a caller selection circuit that is improved in this respect.

(d) Means for Solving the Problems The caller selection circuit of the present invention emits a ringing signal when the number corresponding to the DTMF signal transmitted by the caller after young monk excitation matches the password. In addition, the caller selection operation can be switched between activation and deactivation by the function of a timer circuit.

(*) Function The present invention is capable of controlling switching between activation and inactivation of the caller selection operation by the function of a timer circuit.

(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 operation/non-operation of the caller selection operation, and a common terminal (4a) to which the output signal of the first ringing signal generation circuit (3) is applied.
, a first terminal (4b) connected to the common terminal (4a) when in an inactive state, and a second terminal (4c) connected to the common terminal (4a) when in an active state. (5) has a clock function and a time setting circuit (6)
a timer circuit (8) having an output terminal (7) from which an H (high) level signal is output for a time set by
) is a control switch that controls the control operation by the timer circuit <5>, and (9) is an H level output to the output terminal (7) of the timer circuit (5) when the control switch (8> is in the closed state). (10) is a switch changeover circuit that enters an open operation state to which a signal is applied.
9) is a changeover switch that is switched to the opposite side from the state shown in the figure when it is in an operating state, and the selection switch (4) is
) is connected to the first terminal (4b) of the common terminal (10
a), a first terminal (10b) and a second terminal (10c) connected to the second terminal (4c) of the selection switch (4);
). (11) means that when the selection switch (4) is in the non-operating position and the switch changeover circuit (9) is in the non-operating state, the calling signal from the first calling signal generating circuit (3) is transmitted to the first winding. (12) a transformer applied to
(13) is a speaker that emits a calling signal, and is connected as a load to the second winding (14) constituting the transformer (11). (15) is a second diode bridge circuit provided to determine the polarity of connection with the telephone line, (16) is a hook control circuit that controls the closing operation of the telephone line, and (17) is called a speech network. This is a telephone circuit, and the handset (18) is disconnected. (19) is a dial operation button operated during dial operation, (20) is a dial signal generation circuit that outputs a dial signal corresponding to the number forming the dial operation button (19), (21), (22) and ( 23) are opened by operating the automatic dial operation button. The second and third operating switches (24) are memory circuits that store telephone numbers called by operating the operating switches (21), (22) and (23);
25) is a control circuit that controls the storing and calling operations of the telephone number in the memory circuit (24) in response to the operations of the operation switches (21), (22) and (23);
26), the signal output from the first calling signal generation circuit (3) is the selection switch (4) or the selection switch (4).
and a control terminal to which voltage is applied through the changeover switch (10), and when a signal from the first ringing signal generation circuit (3) is applied to the control terminal (26>), the control circuit (25)
) is configured so that each operation is started. (
27) is a hook operation control signal output terminal that is provided in the control circuit (25) and outputs a signal to control the operation of the hook control circuit (16), and when a signal is applied to the control terminal (26), It is configured to output a signal to close the telephone line when the telephone line is connected. (28) is a drive signal that is output after the telephone line is closed by the operation of the hook control circuit (16) based on the signal output from the hook operation control signal output terminal (26) of the control circuit (25). The drive signal output terminal (29) is a response message sending path that becomes active when a drive signal is output to the drive signal output terminal (28), prompting the caller to send his/her PIN number. It has the function of sending messages. (30) is an input terminal provided in the control circuit (25) and into which a signal corresponding to the number of the dial operation button (19) is input when a telephone number is stored in the memory circuit (24); (31) is an output terminal which is provided in the control circuit (25) and outputs the phone number that has been called from the memory circuit (24) during automatic dialing operation, and is connected to the dial signal generation circuit (20). It is being read. (32> is a DTMF signal receiving circuit that receives a signal transmitted as a PIN number from a caller, that is, a DTMF signal, and is connected to output a coded signal to the control circuit (25). 33) is the above DTM
A reception number memory circuit (34) stores the number received by the F signal reception circuit (32), and the reception number memory circuit (34) becomes operational after the telephone line is closed by the hook control circuit (16). The telephone number stored in the memory circuit (24) and the received number memory circuit (
This is a number verification circuit that performs verification against the number stored in the memory circuit (33), and is equipped with an output terminal (35) that outputs an H level signal when the numbers match. 24> stores the subscriber number, city code, and area code, but the number matching circuit (
34> is performed using, for example, the subscriber number, that is, the last four digits. (36>) is a calling signal that is activated when an H level signal is output to the output terminal (35) of the number matching circuit (34) and is output from the first calling signal generating circuit (3). The second calling signal generation circuit (37) that outputs different calling signals is an amplifier circuit that amplifies the calling signal output from the second calling signal generation circuit (36), and its output signal is transmitted to the transformer (!i).
) is applied to the third winding (38) constituting the telephone circuit (17). In such a circuit configuration, if the number transmitted by the caller and the telephone number stored in the memory circuit (24) do not match, the hook control circuit (1) is activated after a predetermined period of time.
The telephone line is disconnected by the operation 6). Also, when a calling operation is being performed based on a calling signal output from the second calling signal generation circuit (36), that is, when a calling operation is being performed due to a matching operation of numbers by the number matching circuit (34). Handset (18)
When the telephone is removed from the telephone, the number matching circuit (34) and the second ringing signal generating circuit (36) become inactive. After the hook control circuit (16) has received a call, for example, when the second ring signal generation circuit (36) is performing a ringing operation and the caller hangs up, a circuit for detecting a signal change on the telephone line ( The telephone line is disconnected and each circuit is restored by the operation of a control circuit (25) (not shown). The caller selection circuit of the present invention is constructed as described above, and the operation of this circuit will now be described.

First, the operation of storing a telephone number in the memory circuit (24) will be explained. Such a telephone number memorization operation is performed with the first . This is done by operating the second and third operation switches (21), (22) and (23), respectively, and the dial operation button (19) corresponding to the telephone number you wish to memorize.

Further, the response message sending circuit (29) includes a 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 me your telephone number." Also, by operating a setting switch (not shown) provided in the time setting circuit (6), the time at which an H level signal is output to the output terminal (7) of the timer circuit (5) is set. The set time can be set, for example, from 10:00 pm to 6:00 am.

As described above, the memory circuit (24) stores the telephone number, the response message, and the timer circuit (5).
), the time setting operation is performed, and next, the operation as a telephone device will be explained. First, the operation when making a phone call will be explained. When making a call to a person whose telephone number is not stored in the memory circuit (24), remove the handset (18) from the telephone and press the dial operation button (19).
This is done by manipulating the . The handset (1
8) is removed from the telephone set, a hook switch (not shown) is switched, as is well known, to close the telephone line. In such a state, when the dial operation button (19) is operated, a dial signal corresponding to the operation button is outputted from the dial signal generation circuit (20) and sent to the telephone circuit (17).
to the telephone line. The operation when making a call by operating the dial operation button (19) is performed in this way.Next, the case where a call is made by automatic dialing operation will be explained. Such operation is performed by the handset (
18> from the telephone, for example, the first operation switch (2
This is done by closing 1). When the first operation switch (21) is closed, the memory circuit (24) is closed.
) is called and the control circuit (25
> is applied to the dial signal generation circuit (20). As a result, a dial signal corresponding to that number is outputted from the dial signal generating circuit (20) and sent to the trash talk line through the telephone circuit (17). With such operations in place, the owner of the telephone can call the person whose telephone number is stored in the memory circuit (24) by pressing a single button.

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, the selection switch (4) for selecting operation/inoperation of the caller selection operation is in the non-operation position shown, and the control switch (8) for controlling the control operation by the timer circuit (5) is in the open state. In other words, the case where the telephone operates as a normal telephone device will be explained. 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 electronic calling signal is outputted to its output terminal. The calling signal output from the first calling signal generating circuit (3) is applied to the first winding (12) constituting the transformer (11) through the selection switch (4) and the changeover switch (10).

As a result, the second winding (
A ringing signal is induced in 14) and emitted as a ringing tone from the speaker (13). Therefore, the owner of the telephone can recognize that there is an incoming call, and by removing the handset (18) from the telephone, the telephone line is closed and the caller is contacted. 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 the selection switch (4) is in the operating position, the changeover switch (10)
The common terminal (10a) of the first calling signal generating circuit (3
) is disconnected from the output terminal of the timer circuit (5), so even if the control switch (8) is fully opened, no control operation is performed by the timer circuit (5). When a calling signal arrives from the telephone line in such a state, the first calling signal generating circuit (3) outputs the calling signal as described above. In such a state, a ring tone is emitted from the speaker (13) because the signal path to the first winding (12) constituting the transformer (11) is cut off by switching the selection switch (4). Never. The calling signal output from the first calling signal generating circuit (3) is applied to a control terminal (26) provided in a control circuit (25) through a selection switch (4), and is controlled by the control circuit (25). The operation begins. When a calling signal is falsely applied to the control terminal (26) of the control circuit (25), a hook operation control signal output terminal (27) provided in the control circuit (25) is activated to initiate a closing operation. A signal is output, and the hook control circuit (16) performs a telephone line closing operation. After the closing operation is performed, a drive signal is applied to the drive signal output terminal (28) provided in the control circuit (25) to the output failure response message sending circuit (29). When a drive signal is applied to the response message sending circuit (29), the response message sending circuit (29) becomes operational and the message stored in the message memory circuit, that is, ``Yes, this is ○○, yours.'' Please send your phone number.'' A message prompting the sender to send a PIN number is output and sent to the caller through the telephone circuit (17). When a caller who has heard such a message operates a dial button corresponding to a telephone number, a signal corresponding to each button, that is, a DTMF signal, is sent to the telephone line. DT sent by caller
The MF signal passes through the second diode bridge circuit (15), the hook control circuit (16) and the telephone circuit (17) to the D
It is applied to the TMF signal receiving circuit (32). The DTMF
DTMF sent from the calling party to the signal receiving circuit (32)
When a signal is input, the DTMF signal receiving circuit (32) outputs a coded signal corresponding to the number and inputs it to the control circuit (25). The signal input to the control circuit (25) is stored in the received number memory circuit (33) by the function of the control circuit (25). The number matching circuit (34) performs a matching operation with all the telephone numbers stored in the memory circuit (24).The number stored in the received number memory circuit (33>) and the memory circuit (24) If the stored telephone number matches, an H level signal is output to the output terminal (35) of the number matching circuit (34), and this signal is sent to the second
It is applied to the calling signal generation circuit (36). As a result, the second ringing signal generation circuit (36) becomes operational, and a ringing signal different from the ringing tone from the first ringing signal generation circuit (3) is output. The second calling signal generation circuit (3
6) The calling signal outputted from
applied to the winding (38). Therefore, the transformer (1
A ringing signal is induced in the second winding (14) constituting part 1) and to which the speaker (13) is connected as a load, and is emitted as a ringing tone by the speaker (13). During such a calling operation, the calling signal from the second calling signal generating circuit (36) amplified by the amplifier circuit (37) is sent to the caller through the telephone circuit (17). , the calling party can recognize that the calling operation is being performed after the incoming call operation. As a result of this operation, the owner of the telephone can recognize that there is a call due to the ring tone emitted from the speaker (13), and the difference in the ring tone makes it possible for the owner of the telephone to recognize that there is a call, and also to be able to select the caller due to the difference in the ring tone. You can recognize that this is a call. After performing such recognition, when the telephone owner removes the handset (18) from the telephone, the number verification circuit (3)
4) and the second calling signal generating circuit (36>) become inoperative, and a conversation with the calling party is started.

In this way, the number sent by the caller and the memory circuit (
If the number matches the telephone number stored in the second call signal generation circuit (36), a calling operation is performed using the call signal output from the second call signal generation circuit (36), but if there is no matching number, the number verification circuit (34) ) is not outputted to the output terminal (35), and no calling operation is performed. Then, after a predetermined period of time has elapsed, the control circuit (2
5) hook operation control signal output terminal (1
At step 8), the signal for disconnecting the telephone line is output, and the hook control circuit (16) performs the disconnection operation.

In this way, if you receive a call from someone whose phone number does not match the phone number stored in the memory circuit (24), the speaker (13) will not emit a ringing tone, so it may be a prank call or a wrong call. can be excluded.

As described above, the caller selection operation is performed when the selection switch (4> is in the operating position), but then the timer circuit (
The control operation according to 5) will be explained. Such an operation is
This is done by closing the control switch (8) when the selection switch (4) is in the inoperative position shown. A timer circuit (5) is set by the time setting circuit (6).
) output terminal (7) is set to output an H level signal from 10:00 pm to 6:00 am.
Outside of that time, that is, from 6 a.m. to 10 p.m., the output terminal (7) of the timer circuit (5) is in a state where an L (low) level signal is output. Therefore, the switch changeover circuit (9) is in the inoperative state, and the selector switch (10
) is in the state shown. Therefore, the calling signal outputted from the first calling signal generation circuit (3) upon arrival of the calling signal is transmitted to the selection switch (4) and the changeover switch (10).
) through which the first winding (12) constitutes the transformer (u)
The telephone device operates as a normal telephone without being applied to the control terminal (26) provided in the control circuit (25). In this state, at the set time, that is, 10 p.m., an H level signal is output to the output terminal (7) of the timer circuit (5) and the control switch (
8) to the switch changeover circuit (9>). As a result, said switch changeover circuit (9) becomes operational and switches the changeover switch (10) to the opposite side of the state shown. ) is switched to the opposite side of the illustrated state, the first ringing signal generating circuit (3)
The calling signal output from the control circuit (2) is not applied to the first winding (12) constituting the transformer (11).
5), the control terminal (26) provided in the control terminal (26) is in a state where the voltage is applied. Therefore, when in such a state, the telephone device will perform the caller selection operations described above. Then, at the time set in this state, that is, 6 am, the H level signal that has been output to the output terminal (7) of the timer circuit (5) is inverted to L level. the result,
Since the switch changeover circuit (9) becomes inoperative and the changeover switch (10) is returned to the state shown in the figure,
The telephone device becomes operational as a normal telephone device.

Thus, when the control switch (8) is closed, the telephone device is automatically switched by the action of the timer circuit (5) into two different operating states: a normal telephone device and a one-talk device with caller selection. I can do it.

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, by operating a single button, it is compared with a telephone number stored in a memory circuit provided for dialing, but special operation of the speed dial, that is, dial operation button (19) In a telephone device which can call up a telephone number stored in a memory circuit by performing the above operations, it is also possible to perform verification with the telephone number already stored in the memory circuit. In this embodiment, the telephone number fully stored in the memory circuit is used as the PIN number in order to perform the automatic dialing operation. It is also possible to perform a calling operation only when the number sent by the calling party matches the number sent by the calling party.

Furthermore, although the response message sending circuit (29) is configured to store the response message in the memory circuit, it can also be constructed using a tape recorder.

(G) Effects of the Invention The caller selection circuit of the present invention is designed to emit a ringing signal when the number corresponding to the DTMF signal sent from the caller after receiving a call matches the PIN number, which is a nuisance. It can protect the phone owner from calls and wrong calls. Further, the present invention uses a timer circuit to switch between activation and non-operation of the caller selection operation, so that once the time for performing the caller selection operation is set, the caller selection operation will be performed at the same time every day. This is very convenient because the state can be automatically changed.

[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, (5)...Timer circuit, (6)...
・Time setting circuit, (8)...control switch, (9)
... Switch changeover circuit, (10>... Changeover switch, (16) ... Hook control circuit, (17) ...
Telephone circuit, (18)...Handset, (19)...
...Dial operation button, (20)...Dial signal generation circuit, (21)...First operation switch, (22)
...Second operation switch; (23)...Third operation switch, (24)...Memory circuit, (25)
...Control circuit, 29)...Response message sending circuit, (32)...DTMF signal receiving circuit, (33)...
)... Reception number memory circuit, (34)... Number verification circuit, (36)... Second calling signal generation circuit.

Claims (1)

[Claims] (1) Equipped with a caller selection device that emits a ringing signal when the number corresponding to the DTMF signal sent by the caller after receiving the call matches the password, and the operation of the caller selection device - A telephone device equipped with a selection switch for selecting non-operation, characterized in that the telephone device can be switched to a state in which a caller selection operation is performed at a set time by a switching operation of a timer circuit. user selection circuit.