JPH0337341B2 - - Google Patents

Description

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

(b) Conventional technology When a caller makes a phone call, a ring tone sounds in response to a ring signal coming from the telephone line, and by listening to this ring tone, it is possible to recognize that a call is coming. You can. 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, telephone devices that ring only when a person who knows the PIN number makes a call have been re-released, and examples of such technology include Japanese Patent Laid-Open No. 55-11668, for example. There is something disclosed in the publication No. Furthermore, when making a call, manipulating the area code and the other party's number is not only inconvenient, but also poses 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 simple operations are in widespread use, and such technology is disclosed, for example, in Japanese Patent Publication No. 53-30601. There is something.

(c) Problems to be solved by the invention In the technique described above for selecting a caller using a PIN number, the PIN number is set by the owner of the telephone. There is a problem that the caller needs to be informed and 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 detects when the number corresponding to the DTMF signal sent from the caller after receiving a call matches the telephone number stored in the memory circuit. At the same time, a calling signal is emitted and the calling signal is sent to the caller via a telephone line.

(E) Effect The present invention uses a telephone number stored in a memory circuit provided for automatic dialing as a PIN number for selecting a caller, and also sends a ring tone to the caller. This is how it was done.

(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 a first diode bridge circuit that rectifies a calling signal arriving from the telephone line, and 3 is a terminal to which a calling signal rectified by the first diode bridge circuit 2 is applied. 4 is a selection switch that selects operation/inoperation of the caller selection operation, and the illustrated state is a non-operation state. be.
5 is a transformer through which a calling signal from the first calling signal generation circuit 3 is applied to the first winding 6 when the selection switch 4 is in the inoperative position; 7 is a speaker for emitting the calling signal; It is connected to the second winding 8 of the transformer 5 as a load. 9 is a second diode bridge circuit provided to determine the polarity of connection with the telephone circuit; 10 is a hook control circuit for controlling the closing operation of the telephone circuit; and 11 is a telephone circuit called a speech network. , a handset 12 is connected. 13 is a dial operation button that is operated 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; 1;
Reference numerals 5, 16 and 17 indicate first, second and third operating switches, respectively, which are operated during the automatic dialing operation; 18, a memory circuit in which a telephone number for performing the automatic dialing operation is stored; and 19, a memory circuit for each of the operating switches. Correspondingly, a control circuit 20 controls the storage operation of the telephone number in the memory circuit 18 and the operation of calling the telephone number, and the selection switch 4 is in the selection operation position when the signal output from the first calling signal generation circuit 3 is outputted from the control circuit 20. is a control terminal to which a voltage is applied when the control terminal 2
The control circuit 19 is configured to perform various operations when a signal from the first calling signal generation circuit 3 is applied to the control circuit 19. A hook operation control signal output terminal 21 is provided in the control circuit 19 and outputs a signal for controlling the operation of the hook control circuit 10. When a signal is applied to the control terminal 20, the telephone line is closed. It is configured to output a signal that connects the 22 is the control circuit 1
9, a drive signal output terminal to which a drive signal is output after the telephone line is closed by the operation of the hook control circuit 10 according to the signal output from the hook operation control signal output terminal 21; This is a response message sending circuit that becomes active when a drive signal is output to the signal output terminal 22, and has the function of sending a message to the caller to prompt him or her to send his or her personal identification number. 24 is an input terminal provided in the control circuit 19 and to which a signal corresponding to the number of the dial operation button 13 is input when the telephone number is stored in the memory circuit 18; 25 is provided in the control circuit 19; It is also an output terminal to which a telephone number called from the memory circuit 18 is output during automatic dialing operation, and is connected to the dial signal generating circuit 14. 26 is a signal sent by the caller as a PIN number, i.e.
This is a DTMF signal receiving circuit that receives a DTMF signal, outputs a coded signal to the control circuit 19, and stores the signal in a reception number memory circuit (not shown) built into the control circuit 19. is configured to be Reference numeral 27 is a number that becomes operational after the closing operation is performed by the hook control circuit 10 and is used to check the telephone number stored in the memory circuit 18 and the number stored in the received number memory circuit. This is a verification circuit, and includes 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, but the verification operation by the number verification circuit 27 is performed using, for example, the subscriber number, that is, the last four digits. It will be done. 29 is the output terminal 28 of the number matching circuit 27
A second calling signal generation circuit 30 enters the operating state when an H level signal is output from the first calling signal generation circuit 3 and outputs a signal different from the signal outputted from the first calling signal generation circuit 3. This amplification circuit amplifies the calling signal output from the circuit 2, and the output signal is applied to the third winding 31 constituting the transformer 5 and is connected to the telephone circuit 11. In such a circuit configuration, if the number 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 close the telephone circuit. It is configured to be released. Further, when the handset 12 is lifted while the calling signal outputted from the second calling signal generating circuit 29 is being emitted by the speaker 7, the second calling signal generating circuit 29 becomes inactive. It is configured. 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 18 will be explained. Such memory operation is performed using a memory switch (not shown) that is switched only during memory operation.
This is done by operating the first, second, and third operation switches 15, 16, and 17, respectively, and the dial operation button 13 corresponding to the telephone number you wish to memorize, while switching the phone number to the storage operation side. It will be done. In addition, the response message sending circuit 23
The telephone 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 memorization operation. And, as such a response message,
For example, "Yes, this is ○○. Please send your phone number." is stored.

As described above, the operation of storing telephone numbers and response messages in the memory circuit 18 is carried out.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 18, the handset 12
This is done by operating the dial operation button 13 after removing the phone from the telephone. The handset 12
When the telephone is disconnected from the telephone, a switch (not shown) is switched, as is well known, to close the telephone line. In this state, when the dial operation button 13 is operated, a dial signal corresponding to the operation button is outputted 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 in this way, but next, the case where a call is made by automatic dialing operation will be explained. Such an operation is performed by operating operation switches 15, 16, and 17 provided corresponding to the memory in which the telephone number of the person to be called is stored while the handset 12 is removed from the telephone. It is carried out with For example, when the first operation switch 15 is pressed and closed, the memory circuit 1
Among the telephone numbers stored in 8, the telephone number stored in the memory corresponding to the first operation switch 15 is called and applied to the dial signal generation circuit 14. As a result, a dial signal for that number is output from the dial signal generating circuit 14 and sent to the telephone line through the telephone circuit 11. This operation is in progress and you can make a call.

As described above, operations are performed when making a telephone call.Next, operations when a caller receives a telephone call will be explained. First, a case will be described in which the selection switch 4 for selecting whether to operate or not perform the caller selection operation is in the non-operating position shown, that is, when 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 electronic calling signal is outputted to its output terminal. The calling signal outputted from the first calling signal generating circuit 3 is applied to a winding 6 constituting a transformer 5 through a selection switch 4. As a result, a ringing signal is induced in the second winding 8 that constitutes the transformer 5 and is connected to the speaker 7 as a load, and is emitted from the speaker 7 as a ringing tone. The owner of the telephone will therefore be aware of the incoming call, and by disconnecting the handset 12 from the telephone, a closing operation will be performed and the caller will be able to speak.

As described above, the operations are performed when operating as a normal telephone device.Next, the operation 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 will be explained. do. When a calling signal arrives from the telephone circuit when the selection switch 4 is in the operating state, the first calling signal generating circuit 3 outputs the calling signal as described above. In such a state, the first winding 6 constituting the transformer 5 is changed by switching the selection switch 4.
Since the signal path to speaker 7 is blocked,
No ringtone will be emitted. The calling signal outputted from the first calling signal generating circuit 3 is applied to a control terminal 20 provided in a control circuit 19 through a selection switch 4, and a control operation by the control circuit 19 is started. 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 circuit 10 A telephone line closing operation is performed. After such a closing operation is performed, a drive signal is outputted to a drive signal output terminal 22 provided in the control circuit 19 and applied to a response message sending circuit 23. When the drive signal is applied to the response message sending circuit 23, the response message sending circuit 23 becomes operational and sends the message stored in the message memory circuit, that is, ``Yes, this is ○○.Your phone number.'' Please enter your password.'' is output and sent to the caller through the telephone circuit 11. 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 DTFF signal, is sent to the telephone circuit. The DTMF signal sent from the calling party is applied to the DTMF signal receiving circuit 26 through the second diode bridge circuit 9, the hook control circuit 10 and the telephone circuit 11. When a DTMF signal sent from the calling party is applied to the DTMF signal receiving circuit 26, a coded signal corresponding to the number is output from the DTMF signal receiving circuit 26 and input to the control circuit 19. . The coded signal input to the control circuit 19 is stored by a received signal memory circuit built into the control circuit 19. The number matching circuit 27 then compares the number stored in the received number memory circuit with the telephone number stored in the memory circuit 18. If the number stored in the received number memory circuit matches the number stored in the memory circuit 18, the number matching circuit 2
An H level signal is output to the output terminal 28 of 7,
This signal is applied to the second calling signal generation circuit 29. As a result, the second ringing signal generation circuit 29 becomes operational, and a ringing signal different from the ringing tone from the first ringing signal generation circuit 3 is output. The calling signal outputted from the second calling signal generating circuit 29 is input to an amplifier circuit 30, amplified, and then applied to a third winding 31 constituting the transformer 5.
Therefore, a ringing signal is induced in the second winding 8 that constitutes the transformer 5 and to which the speaker 7 is connected as a load, and is emitted by the speaker 7 as a ringing tone. When such a calling operation is being performed, the calling signal from the second calling signal generating circuit 29 amplified by the amplifier circuit 30 is sent to the calling party through the telephone circuit 11, so that 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
The difference in the ringing tones makes it possible to recognize that the call is related to a caller selection operation. 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 inactive, and a conversation with the caller is carried out. become. In this way, when the number sent by the caller and the telephone number stored in the memory circuit 18 match, a calling operation is performed using a calling signal output from the second calling signal generation circuit 29, but when the matching number If there is no
No level signal is output, and the second calling signal generation circuit 29 is never activated. When a predetermined period of time has elapsed, a signal for disconnecting 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 performs the disconnection operation. In this way, when a call is received from a person whose phone number does not match the phone number stored in the memory circuit 18, no ring tone is emitted from the speaker 7, thereby eliminating prank calls and mistaken calls. 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. Furthermore, 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 which calls up a telephone number stored in a memory circuit by doing this, it is also possible to perform verification with the telephone number stored in the memory circuit. Although the response message sending circuit 23 is configured to store the response message in the memory circuit, it may also be constructed using a tape recorder.

(G) Effects of the Invention The caller selection circuit of the present invention emits a ringing signal when the number corresponding to the DTMF signal transmitted from the caller after receiving a call matches the number stored in the memory circuit. This not only protects the phone owner from prank calls and mistaken calls, but also allows the caller selection PIN to be stored in a memory circuit for automatic dialing. This has the advantage that not only does the owner of the phone not have to tell a specific person his/her PIN number, but it also solves the problem of the caller forgetting their PIN number. are doing. Furthermore, the present invention provides a method for transmitting a DTMF signal sent from a calling party after receiving a call.
When the number corresponding to the signal matches the telephone number stored in the memory circuit for automatic dialing and the emitting operation of the ringing signal is started,
Since the ringing signal output from the sound emitting device is sent to the caller, the caller can perform the ringing operation in the same way as the ringback tone signal that was sent from the telephone circuit before receiving the call. Therefore, the present invention has the effect of not giving the caller a sense of anxiety.

[Brief explanation of drawings]

The illustrated circuit is one embodiment of the caller selection circuit of the present invention. Explanation of main drawing numbers, 3...First ring signal generation circuit, 4...Selection switch, 5...Transformer, 7...
...Speaker, 10...Hook control circuit, 11...
... Telephone circuit, 12 ... Handset, 13 ... Dial operation button, 14 ... Dial signal generation circuit, 1
8...Memory circuit, 19...Control circuit, 23...
...Response message sending circuit, 26...DTMF signal receiving circuit, 27... Number verification circuit, 29... Second calling signal generation circuit.

Claims (1)

[Claims] 1 Equipped with an automatic dialing device that sends out a dialing signal by calling the telephone number stored in the memory circuit, and the number corresponding to the DTMF signal sent by the caller after receiving the call matches the PIN number. In a telephone device equipped with a sound emitting device that emits a ringing signal when 1. A caller selection circuit for a telephone device, characterized in that when a ringing signal is being sounded, the calling signal is sent to the caller via a telephone line.