JPS63209355A - Caller identification device - Google Patents

Abstract

PURPOSE:To prevent illegal use without connecting an incoming call even if combinations of numbers are leaked by identifying the caller depending on the kind of a pushbutton signal and its sending time. CONSTITUTION:On receiving a call to a telephone line 100, an automatic reply circuit 101 replies the call automatically to urge the caller to send a pushbutton signal. In case of sending the pushbutton signal, a pushbutton signal detection circuit 102 detects its number and sending time and writes it in a storage circuit 3. When number of digits is coincident with the number of digits registered in the storage circuit 104, the storage circuit 104 is retrieved, the transmission time is compared as to the coincident number and when it is within a prescribed error, the connection signal is outputted to the switching circuit 106 to connect the line 100 to a master set circuit 107.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a telephone having an automatic answering function, and more particularly to a telephone having a caller identification function.

[Conventional technology]

Conventionally, this type of telephone set has identified a caller by a combination of numbers in a received pushbutton signal.

[Problem that the invention seeks to solve]

The conventional telephones mentioned above identify the caller only by a combination of numbers, so if this combination of numbers is leaked to someone else,
The drawback is that it can be easily exploited.

[Means for solving the problem (4)] The caller identification device of the present invention is connected to a telephone line, and when a call is received on the telephone line, the telephone is kept in a receiving state and a caller identification device is connected to the telephone line. an automatic response circuit that outputs a signal prompting the sender to send a caller identification signal; a first memory circuit; A push button signal detection circuit to be written into the circuit, a second memory circuit in which information on the type and sending time of the push button signal for identifying a predetermined caller is stored, and information to be written in the first memory circuit. The type and sending time of the inserted push button signal are compared with the type and sending time stored in the second storage circuit, and if the type of the push button signal matches and the sending time is stored in the second storage circuit. It has a comparison circuit that outputs a connection signal when the stored transmission time is within a predetermined error range, and a switching circuit that connects the incoming call to the main device when the connection signal is input.

[Operation] In this way, by identifying the caller based on the type of push button signal and its sending time, even if the combination of numbers is missed, the incoming call can be connected as long as the time information is not known.7. 1"

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the caller identification device of the present invention, and FIG. 2 is a storage format diagram of the storage circuit 104 shown in FIG.

As shown in FIG. 2, the memory circuit 104 stores a predetermined number of digits, 200.
Information about the type (number in this case) 201 and the sending time 202 of the push button signal corresponding to the type 201 is recorded.

After a call arrives at the telephone line 100 and the automatic answering circuit 101 responds, the push button signal detection circuit 102 detects the number of the push button signal sent by the caller and its sending time, and stores it in the storage circuit 103. . Comparison circuit 105 is memory circuit 10
Determine whether the number and sending time of the push button signal stored in step 3 are stored in the memory circuit, and if they are stored,
A connection signal is output to the switching circuit 106 to connect the telephone line 100 to the main device line 107.

Next, the operation of this embodiment will be explained.

When a call is received on the telephone line 100, an automatic response circuit 101 automatically answers the call, holds the line in a receiving state, and prompts the caller to send a push button signal for caller identification. When the caller sends a push button signal, the push button signal detection circuit 102 detects the number and sending time and writes it into the memory circuit 103. The comparison circuit 105 constantly monitors the number of digits in the memory circuit 103, and when the number of digits matches the number of digits registered in the memory circuit 104, it searches the memory circuit 104 using the number stored in the memory circuit 103. The transmission time for the matched number is compared with the time registered in the memory circuit 104, and if it is within a predetermined error range, the connection signal is cut off.
Output to. The switching circuit 106 thereby switches the telephone line 10
0 to the main device line 107.

Note that the transmission time may be determined in advance for each digit of the number.

〔Effect of the invention〕

As described above, the present invention has the effect of preventing abuse even if a combination of numbers is missed by identifying the caller based on the type and sending time of the push button signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the caller identification device of the present invention, and FIG. 2 is a diagram of the storage format of the storage devices 103 and 104 in FIG. 100...Telephone line, 101...Automatic answering circuit,
102...Push button signal detection circuit, 103.104...Storage circuit, 105...Comparison circuit, 106...Switching circuit, 10
7...Main device line, 200...Number of digits, 201...
Type, 202... Sending time.

Claims (1)

[Claims] The telephone is connected to a telephone line, and when a call is received on the telephone line, the telephone is held in a receiving state and a signal is output to prompt the caller to send a caller identification signal. a first memory circuit; a pushbutton signal detection circuit that detects the type of pushbutton signal sent by the caller and its sending time and writes it into the first memory circuit; a second memory circuit that stores information on the type and transmission time of a pushbutton signal for identifying a caller; The type and sending time stored in the second storage circuit are compared, and the type of the push button signal matches, and the sending time is within a predetermined error range of the sending time stored in the second storage circuit. A caller identification device comprising: a comparison circuit that outputs a connection signal when the connection signal is present; and a switching circuit that connects the incoming call to the main device when the connection signal is input.