JPH0411151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a telephone device equipped with a device for protecting the telephone owner against 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. The telephone device is configured to do so.
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. 1983-1999. There is one disclosed in Publication No. 11668.
Furthermore, recently, devices have been introduced that use a display circuit such as a display element along with a ringing tone to indicate who is the caller.

(c) Problems to be solved by the invention As mentioned above, a caller is selected using a PIN code, etc., and only when a call is received from a specific caller, a ring tone is emitted and the caller is In a telephone device designed to indicate who is a specific caller, when a call is received from a specific caller, both a ringing signal generation circuit that emits a ring tone and a display circuit that performs a display operation are activated. Therefore, the operating current was received from the dry cell battery or the commercial power source, which caused problems such as the need to replace the dry cell battery and the need to install it near the commercial power source. Therefore, we are thinking of extracting the operating current for the ringing signal generation circuit and display circuit from between the telephone lines, but the ringing signal generation circuit and display circuit are activated only after receiving the PIN number from the caller. , the telephone line goes off-hook, and compared to when it is on-hook,
The voltage has dropped and only a low current of 20 to 120 mA can be drawn. Therefore, if you try to operate both circuits using current from the telephone line, one circuit will receive enough current to go into operation, but the other circuit will not receive enough current to go into operation. This can lead to problems. The present invention solves this problem and provides a telephone device that is capable of emitting a ringing tone and displaying a display even when receiving current from an off-hook telephone line.

(d) Means for Solving Problems The telephone device of the present invention includes a first ringing signal generation circuit that detects a ringer signal transmitted from a calling party and generates a first ringing signal; A hook control circuit that is controlled by a ringing signal and performs a telephone line closing operation checks the number corresponding to the DTMF signal sent by the calling party after the telephone line is closed and the PIN number to find a match. and a number verification circuit that outputs a regular signal that alternately repeats a first level and a second level; and a number verification circuit that becomes operational in response to the first level of the signal output by the number verification circuit and sends out a second calling signal. and a display circuit that becomes operational and performs a display operation in response to the second level of the signal output from the number verification circuit.

(E) Function The present invention allows the ringing signal generation circuit to draw operating current from the telephone line by receiving the first level of a regular signal that alternately repeats the first level and the second level output from the number matching circuit. By receiving the second level, the display circuit receives operating current from the telephone line.

(F) Embodiment An embodiment of the telephone device of the present invention is shown in FIG.
FIG. 2 shows the output signal of the number matching circuit in the telephone device of the present invention. In FIG. 1, 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 for rectifying a calling signal that is rectified by the first diode bridge circuit 2. A first ringing signal generation circuit outputs a ringing signal in response to the ringing signal when applied, and 4 is a selection switch that selects whether or not to operate the caller selection operation, and the illustrated state is an inactive state. It is. 5 is a transformer to which a calling signal from the first calling signal generating circuit 3 is applied to the first winding 6 when the selection switch 4 is in the inoperative position;
1 is a calling signal amplifying circuit for amplifying the calling signal induced in the second winding 8 of the transformer 5 ; 9 is a speaker for emitting the output of the calling signal amplifying circuit 7;
0 is a second diode bridge circuit provided to determine the polarity of connection with the telephone line; 11 is a hook control circuit for controlling the closing operation of the telephone line;
12 is a telephone circuit called a speech network, to which a handset 13 is connected. 14
is the dial operation button that is operated during dial operation, 1
5 is a dial signal generating circuit that outputs a dial signal corresponding to the number constituting the dial operation button 14, and 16, 17, and 18 are first and second dial signals that are closed by operating the automatic dial operation button, respectively. 2 and 3 operation switches, 19 a memory circuit in which a telephone number for automatic dialing is stored, and 20 controlling the storage and calling operations of the telephone number in the memory circuit 19 corresponding to each of the operation switches. A control circuit 21 indicates that the signal output from the first calling signal generation circuit 3 is selected by the selection switch 4.
is a control terminal to which a signal is applied when is in a selected operation position, and is configured such that when a signal from the first calling signal generation circuit 3 is applied to the control terminal 21, each operation by the control circuit 20 is started. has been done.
Reference numeral 22 denotes a hook operation control signal output terminal which is provided in the control circuit 20 and outputs a signal for controlling the operation of the hook control circuit 11. When a signal is applied to the control terminal 21, the telephone line is connected. It is configured to output a signal for closing. 23 is 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 11 in accordance with the signal output from the hook operation control signal output terminal 22 of the control circuit 20; Reference numeral 24 denotes a response message sending circuit which becomes active when a drive signal is output to the drive signal output terminal 23, and has the function of sending a message to the calling party to prompt him or her to send a personal identification number. 2
Reference numeral 5 is an input terminal provided in the control circuit 20 and to which a signal corresponding to the number of the dial operation button 15 is inputted during storage operation of the telephone number to the memory circuit 19; It is also an output terminal to which a telephone number called from the memory circuit 19 is output during automatic dialing operation, and is connected to the dial signal generating circuit 15. 27 is a DTMF that receives a signal sent as a PIN number from a caller, that is, a DTMF signal.
It is a signal receiving circuit and is connected to output a coded signal to the control circuit 20. 28
2 is a received mail number memory circuit in which the number received by the DTMF signal receiving circuit 27 is stored;
Reference numeral 9 indicates that the hook control circuit 11 is in operation after the telephone line is closed, and the number stored in the memory circuit 19 is compared with the number stored in the received number memory circuit 19. If the numbers match, in this embodiment, as shown in FIG.
A square wave signal is output which alternately repeats an "H" level signal (for about 1 second) and an "L" level signal (for about 2 seconds), and this signal is outputted via the output terminal 30. In such a circuit, the memory circuit 19 stores a subscriber number, a city code, and an area code, and the verification operation by the number verification circuit 29 is performed based on, for example, the subscriber number, that is, the last four digits. It is done. 31 is the number matching circuit 29
When an "H" level signal is being output from the output terminal 30 of the circuit, it receives an operating current and enters the operating state, and outputs a ringing signal different from the ringing signal output from the first ringing signal generation circuit 3. A calling signal output from the second calling signal generating circuit 31 is applied to a third winding 32 constituting the transformer 5 . 3
3 is a switching circuit that is turned on when an "L" level signal is output from the output terminal 30 of the number verification circuit 29; 34 is supplied with operating current via the switching circuit 33 that is in the on state, and is in the operating state. When the DTMF signal sent from the caller and the telephone number stored in the memory circuit 19 match through the verification operation by the number verification circuit 29, the drive circuit becomes operational and the matched telephone The number of the automatic dial operation button in which the number is stored is displayed on the number display 35. In such a circuit configuration, if the number sent by the caller and the telephone number stored in the memory circuit 19 do not match, the telephone line is closed by the operation of the hook control circuit 11 after a predetermined time. configured to release the knot.
Further, when the calling signal output from the second calling signal generation circuit 31 is being emitted by the speaker 9, that is, when the calling operation is being performed in accordance with the number matching operation by the number matching circuit 29. Handset 1
3 from the telephone, the second ring signal generation circuit 31
When the switch circuit 33 and the drive circuit 34 become inactive, the switch circuit 33 and the drive circuit 34 become inactive. The telephone device of the present invention is constructed as described above, and the operation of the telephone device will now be described.

First, the operation of storing a telephone number in the memory circuit 19 will be explained. To memorize a telephone number, operate the first, second, and third operation switches 16, 17, and 18, respectively, while switching the memorization switch (not shown), which is switched only during memorization, to the memorization operation side. This is done by simultaneously operating the dial operation button 14 corresponding to the telephone number desired to be stored. Further, the response message sending circuit 24 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. And, as such a response message,
For example, "Yes, this is ○○. Please send your phone number." is memorized. As described above, the operation of storing telephone numbers and response messages in the memory circuit 19 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 19, the call is made by operating the dial operation button 14 after removing the handset 13 from the telephone. When the handset 13 is removed from the telephone, a switch (not shown) is activated as is well known.
is switched and the telephone line is closed. In such a state, the dial signal corresponding to the dial operation button 14 is transmitted to the dial signal generating circuit 1.
5 and sent to the telephone line via the telephone circuit 12 and connection terminal 1. The operation when making a call using the dial operation button 14 is performed in this way.Next, the case where a call is made by automatic dialing operation will be explained. Such an operation is
When the handset 13 is removed from the telephone, the automatic dialing operation button is operated to operate the operation switches 16, 17, and 18 provided corresponding to the memory in which the telephone number of the person to be called is stored. This is done by closing it. For example, when the first operating switch 16 is pressed and closed, the telephone number stored in the memory corresponding to the first operating switch 16 among the telephone numbers stored in the memory circuit 19 is called up, and the control circuit 20 The signal is applied to the dial signal generating circuit 15 through. As a result, a dial signal corresponding to that number is output from the dial signal generating circuit 15 and sent to the telephone line via the telephone circuit 12 and the connection terminal 1. With such operations performed, the owner of the telephone can call the person whose telephone number is stored in the memory circuit 19 by automatic dialing. 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 description will be given of a case where the selection switch 4 for selecting whether to activate or deactivate the caller selection operation is in the inoperative position shown in FIG. 1, that is, when the telephone operates as a normal telephone device. When a calling signal arrives from the telephone line in the state shown in FIG. 1, the calling signal is applied to the first calling signal generating circuit 3 via the first diode bridge circuit 2. As a result, the first
The calling signal generating circuit 3 is activated, 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 a first winding 6 constituting a transformer 5 through a selection switch 4. As a result, the signal is applied from the second winding 8 of the transformer 5 to the ringing signal amplifier circuit 7, where it is amplified and emitted as a ringing tone through the speaker 9. Ru. Therefore, the owner of the telephone becomes aware of the incoming call, and by removing the handset 13 from the telephone, the telephone line is closed and the caller is contacted. I can do it.

As described above, the operation when operating as a normal telephone device is carried out, but next, the selection switch 4 is set to the first
The operation in the operation position opposite to the state shown in the figure, that is, in the position where the caller selection operation is performed, will be described. First, in this embodiment, the password sent by the caller is the last four digits of the caller's telephone number. 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 outputs the calling signal as described above. In such a state, the signal path to the first winding 6 of the transformer 5 is cut off by switching the selection switch 4, so that no ringing tone is emitted from the speaker 9. Said first
The calling signal outputted from the calling signal generating circuit 3 is applied to the control terminal 21 provided in the control circuit 20 through the selection switch 4, and the control operation by the control circuit 20 is started. When a call signal is applied to the control terminal 21 of the control circuit 20, a signal for performing a closing operation is output to the hook operation control signal output terminal 22 provided in the control circuit 20, and the hook control circuit 11 outputs a signal for performing a closing operation. A telephone line closing operation is performed. After the closing operation is performed, a drive signal is outputted to the drive signal output terminal 23 provided in the control circuit 20 and applied to the response message sending circuit 24. When a drive signal is applied to the response message sending circuit 24, the response message sending circuit 24 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 via the telephone circuit 12 - connection terminal 1. 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. Sent by caller
The DTMF signal is transmitted through a second diode bridge circuit 10,
Through the hook control circuit 11 and telephone circuit 12
The signal is applied to the DTMF signal receiving circuit 27. Applicable
When the DTMF signal sent from the calling party is applied to the DTMF signal receiving circuit 27, the DTMF signal receiving circuit 27 outputs a coded signal corresponding to the number and inputs it to the control circuit 20. The signal input to the control circuit 20 is
0 to the received number memory circuit 28 and stored in the received number memory circuit 28.
The number matching circuit 29 then compares the number stored in the received number memory circuit 28 with the number stored in the memory circuit 19. In such a state, if the number stored in the received number memory circuit 28 and the number stored in the memory circuit 19 match, the output terminal 30 of the number matching circuit 29 outputs about the number shown in FIG. A square wave signal in which "H" level for 1 second and "L" level for about 2 seconds are alternately repeated is output, and when the signal is at "H" level, the second calling signal generation circuit 31 The hook control circuit 11 receives an operating current from the telephone line via the second diode bridge circuit 10, becomes operational, and transmits a signal of a sound different from the ringing tone from the first ringing signal generating circuit 3 to the transformer. The signal is applied to the third winding 32 constituting the transformer 5 , and the signal is induced in the second winding 8 constituting the transformer 5 , and the signal is amplified by the calling signal amplification circuit 7 and emitted for about 1 second. The number verification circuit 29
When the output signal is at the "L" level, the switching circuit 33 is turned on, and the operating current from the telephone line that had activated the second ringing signal generating circuit 31 is supplied to the drive circuit 34, and the second ringing signal generating circuit 31 is activated. The drive circuit 34 is put into operation, and the control circuit 20 receives information about the number of the automatic dial operation button provided corresponding to the memory in which the matched telephone number is stored, and displays the number on the numeric display 35. For example, "1" is displayed for about 2 seconds, and the sound emitting operation for 1 second and the display operation for 2 seconds are performed alternately in response to the output signal of the number verification circuit 29, and the owner of the telephone device In contrast, the numeric display 35 was operated to display when there was no sound while the ringing tone was being emitted. Thereby, the owner of the telephone can recognize that there is a telephone call by listening to the ringing tone made up of the output signal of the second ringing signal generation circuit 31 which is emitted from the speaker 9. but also
The caller can be recognized by the number displayed on the number display 35 in a manner that blinks for 2 seconds at 1-second intervals. After performing this recognition, when the telephone owner removes the handset 13 from the telephone, the number verification circuit 29, second ring signal generation circuit 31, switching circuit 33, and drive circuit 34 become inactive and the call is made. A call will be made with the person. In this way, when the number sent by the caller matches the telephone number stored in the memory circuit 19, a calling operation is performed by a calling signal outputted from the second calling signal generation circuit 31 and a call is made by the numeric display 35. However, if there is no matching number, no output signal is output from the output terminal 30 of the number verification circuit 29, and neither the calling operation nor the display operation is performed. 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 22 provided in the control circuit 20, and the hook control circuit 11 performs the disconnection operation. In this way, if a call is received from a person whose phone number does not match the phone number stored in the memory circuit 19, the speaker 9 will not emit a ringing tone, thereby eliminating prank calls and mistaken calls. You can. 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, a numeric display 35 is used in this embodiment for display operation, but instead of the numeric display 35, light emitting diodes are provided corresponding to each automatic dialing operation button, corresponding to the memory in which the matching telephone number is stored. There is no problem even if the light emitting diode corresponding to the automatic dial operation button provided in the dial is made to emit light for display operation. Furthermore, the output signal of the number verification circuit 29 is not limited to the square wave shown in FIG. 2, but may be a regular continuous signal that alternately repeats two levels such as "H" level and "L" level. Bye. Furthermore, although the response message sending circuit 24 in this embodiment is configured to store the response message in a memory circuit, it can also be constructed using a tape recorder.

(g) Effects of the invention The telephone device of the present invention is capable of receiving
The number corresponding to the DTMF signal is checked against the PIN number, and when they match, the first level of the signal is output using a number matching circuit that outputs a regular signal that alternately repeats the first level and the second level. Only while receiving the second level of the signal, the ringing signal generation circuit receives the operating current, becomes operational, and performs the ringing signal generation operation, and only while receiving the second level of the signal, the display circuit receives the operating current. The ringing signal generating circuit and the display circuit are configured to not go into the operating state at the same time, so that the ringing signal generation circuit and the display circuit do not go into the operating state at the same time. It is now possible to operate using low current from state telephone lines.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the telephone device of the present invention, and FIG. 2 shows an output signal of the number matching circuit shown in FIG. Explanation of main drawing numbers, 3...First ringing signal generation circuit, 4...Selection switch, 9...Speaker, 11
... Hook control circuit, 12 ... Telephone circuit, 19
...Memory circuit, 24...Response message sending circuit, 27...DTMF signal receiving circuit, 29...
Number verification circuit, 31... second calling signal generation circuit,
33... Switching circuit, 34... Drive circuit,
35...Numeric display.

Claims (1)

[Claims] 1. A first ringing signal generation circuit that detects a ringer signal sent from a calling party and generates a first ringing signal, and a hook control circuit that is controlled by the first ringing signal and performs a telephone line closing operation. was sent by the caller after the telephone line was closed.
A number matching circuit that matches a number corresponding to a DTMF signal with a personal identification number and outputs a regular signal that alternately repeats a first level and a second level when they match; A second calling signal generation circuit that becomes operational in response to the first level and sends out a second calling signal, and a display that becomes operational and performs a display operation in response to the second level of the signal output by the number verification circuit. A telephone device comprising a circuit.