KR960013379B1 - Call protection method - Google Patents

Abstract

storing a phone number to prevent call without permission in a registered number recorder(5); converting the composite frequency signal transmitted through a telephone line into the digital signal, with a composite frequency decoder(2); decoding the phone number dialing transmitted through the telephone line by recognition of a central controller(1); and blocking the call by opening the telephone line for a constant time at a mode switch(8) when the decoded number coincides with the stored number.

Description

Selective Prevention of Unauthorized Calls

1 is a circuit diagram showing an embodiment of the present invention

2 is a code table of instructions (examples) and interpretations (examples) used in describing the operation of the present invention.

3 is a flow chart of the functional implementation of the present invention.

4 is a flowchart of a registration number change / save function implementation during the command function interpretation / execution of the present invention.

* Explanation of symbols for the main parts of the drawings

1: central controller 2: complex frequency analyzer

3: elapsed time timer 4: data temporary storage unit

5: Register number register 6: Memory comparison searcher

7: memory manager 8: mode switch

9: the mechanical mechanism

The present invention relates to a method for preventing an unauthorized call of the phone, and in particular, the user can optionally store the other party's phone number to limit the unauthorized call, by detecting and blocking a call attempt with the stored phone number In addition, the present invention relates to a method for selectively preventing unauthorized calls, which restricts the user from being able to make a phone call with a partner of a telephone number which is arbitrarily selected and memorized by the user.

In the conventional various call restriction techniques, the long distance / international telephone unauthorized call prevention techniques for limiting the call when dialing from zero is considered mechanically / electrically. Became.

But. Conventional call limiting technologies are intended to prevent long distance / international calls. The user arbitrarily remembers only some of the calls that he wants to restrict and cannot selectively limit only the calls with the phone number. Even during local calls, some calls do not adequately accommodate the requirement to restrict unauthorized calls or to selectively limit unauthorized calls to some lines, not all of them.

The present invention provides a method for preventing an unauthorized call, wherein a complex frequency analysis device converts a compound douche signal transmitted from a telephone to a line into a digital signal so that the central controller recognizes the digital signal. By deciphering it. The user can arbitrarily remember the other party's phone number to limit the unauthorized call, and detects when a call with the stored phone number is attempted, and opens the line for a certain time to block the call. In order to limit the city / long distance / international calls, the present invention will be described in detail with reference to the accompanying drawings as follows.

As shown in FIG. 1, the present invention connects the relay driving unit 9 consisting of a relay and a driving circuit for carrying out the opening / shorting of the line to the telephone line and to control it with the central controller 1, As a peripheral configuration of the controller (1), a compound frequency analyzer (2) for converting the complex frequency transmitted from the user to the line into a digital signal and sending the digital signal to the central controller (I) by the control of the central controller (1). Each time the digital signal is read by the central frequency analyzer (2) by the central controller (1), it is re-counted every time, so that the time between the data and the data is displayed and the time is passed to the central controller (1). The call dialing is interpreted as interrupted or ended by indicating that the call has been made. Therefore, the incoming digital signal is the first number of the next call dialing. Elapsed time timer (3) for recognizing the central controller (1), data temporal storage (4) for temporarily storing data under the control of the central controller (1), and memory grids assigned by a series of telephone number digits The registration number register (5), which is a memory for storing the call prevention number registered by the user, and the contents corresponding to the contents of the data temporary storage unit (4) under the control of the central controller (1) are registered. The memory comparison searcher 6, which compares / searches the data stored in the control unit and passes the result to the central controller 1, and the contents of the data temporary storage unit 4 under the control of the central controller 1 A memory manager 7 which stores / changes in the memory grid and performs a function of sequentially rearranging the recorded contents of the registration number register 5 according to the changed contents; Etc It consists of a mode switching switch (8) connected to the central controller (1) to distinguish whether it is a command mode defining the function of the device such as lock / change.

The operation of the present invention is described with reference to FIGS. 2, 3 and 4.

The central controller 1 detects the state of the mode switching switch 8 to determine whether it is a command mode or a use mode. When the use mode function is started, the number of digits shall start from the first digit of the telephone number, and the central controller (1) operates the elapsed time timer (3) to display the time between the data and the complex frequency analyzer (2). Wait for data to enter. When the complex frequency is sent from the user to the line, the complex frequency analyzer 2 changes the complex frequency into a digital signal, and the central controller 1 controls the complex frequency analyzer 2 to receive the digital signal and to the next dialing. The elapsed time timer (3) is to be re-counted to measure the time. If a certain time has elapsed due to the delay of the complex frequency transmission, the elapsed time timer (3) notifies the central controller (1) of the time elapsed so that the dialing is stopped or terminated. The signal received by the central controller 1, one-digit data of the telephone number, is stored in the data temporary storage unit 4. Under the control of the central controller 1, the memory comparison searcher 6 compares / searches and matches whether the contents matching the contents of the data temporary storage section 4 are registered in the corresponding digit memory grid of the registration number recorder 5. It informs the central controller 1 whether it is. The central controller 1 increases the number of digits and prepares to process the data of the next phone number, and comprehensively analyzes the comparison / search results of the memory comparison searcher 6 to determine whether to block the call. If the call should not be blocked, the function is repeated until the telephone number is terminated or stopped by receiving data from the compound note tree analyzer 2 and recognizing and processing the data as the next digit. On the other hand, if the analysis result of the central controller 1 is determined to be an unauthorized call and the call should be blocked, the relay driving unit is controlled to open the line for a predetermined time to block the call.

In command mode function. When a complex frequency is sent from the user to the line, the complex frequency analyzer 2 changes the complex fruit tree into a digital signal, and the central controller 1 controls the complex fruit tree analyzer 2 to sequentially output a series of digital signals. It accepts and interprets this digital signal to perform a command function. For example, when 0, 0, and # are sequentially entered as shown in the code table of the example (example) and the interpretation (example) of FIG. 2, the central controller (1) changes / stores the contents of the registration number register (5). ! Is interpreted as a command, and then a series of digital signals coming through the composite frequency analyzer (2) is interpreted as data to change / store the contents of the registration number register (5). In this way, the central controller (1) divides the data coming through the complex frequency analyzer (2) into commands and data. The command is interpreted and the function of the command is executed. FIG. 3 is a flowchart of a function implementation showing such an operation flow.

The registration number change / storage function, which is the main function of the present invention, is described in the sequence function analysis / execution step (3-1) shown in FIG.

First, as described above, if 0, 0, and # are sequentially entered as shown in the command (example) code table of Fig. 2, the central controller (1) changes / stores the contents of the registration register (5)! Is interpreted as a command, and a series of digital signals coming through the complex frequency analyzer (2) is interpreted as data to change / store the contents of the registration number register (5) so that data is input to the complex frequency analyzer (2). waiting. In command function mode, data numbers include 0 to 9 telephone numbers, as well as a telegram number control key (#) and a batch number control signal (*).

The control signals are configured to distinguish between telephone numbers and telephone numbers or to perform collective control. Here, the batch control means the number of the corresponding digits. For example, if the area code 2 is registered with 0 and 2 and *, it can mean the whole number starting with 2. The effect is to make it change.

When a complex frequency is sent from the user to the line, the complex frequency analyzer 2 changes the complex frequency into a digital signal, and the central controller 1 controls the complex frequency analyzer 2 to receive the digital signal as data. After determining that the signal is a telephone number classification control signal, the central controller 1 stores this data in the data temporary storage unit 4 if it is not a telephone number classification control signal. If the phone number classification control signal, the current phone number processing is terminated and the number of digits is initialized considering that the data of the first digit of the new phone number is input. Memory manager

(7) indicates that if the central controller (1) is under control, this data is a number from 0 to 9. If the data corresponds to the batch number control signal, the batch number function saves and changes the allocated memory grid of the corresponding number digit in the registration number register (5) as described in the data temporary storage section (4). ) Rearranges the contents of the registered registration number register 5 so that the comparison search is easy.

The central controller 1 checks the state of the mode switching switch 8, and if the command mode continues, the number of digits is increased to process the next data and the data of the next number of digits is changed / stored. Continue until. When the mode is changed to use mode, the command mode is stopped and the mode is used. 4 is a flowchart for implementing a registration number change / save function during command function interpretation / execution.

Therefore, in an unauthorized call prevention device. The composite frequency analyzer (2) converts the complex frequency signal transmitted from the telephone to the line into a digital signal. By allowing the central controller 1 to recognize this digital signal, it is possible to decipher the telephone number dialing sent to the line, so that the user can arbitrarily memorize the other's telephone number to restrict the unauthorized call. When a call with a phone number is attempted, it detects this and opens the track for a certain period of time, thereby blocking the call. Unauthorized local / international / international calls have the effect of restricting them.

In the present invention, the transmission degree on the line is used to decode the telephone number dialing transmitted to the line by linking a general telephone number dialing rule to the central controller without using a complex frequency analyzer for converting the compound pear into a digital signal. It may be. In addition, in the present invention, it is possible to switch to the use mode or the command mode by using a command composed of a telephone control signal such as # or * without using a mode switching switch.

Claims (3)

Central controller (1) for controlling the mechanical drive (9) for opening / shorting of the track and its surrounding configuration as a complex frequency analyzer (2), elapsed time timer (3), registration number register (5) and mode In the method for selectively preventing unauthorized calls by using a configuration consisting of a changeover switch (8). Storing the other party's telephone number to which the unauthorized call is to be restricted in the registration number recorder (5). Converting the complex frequency signal transmitted to the telephone line by the complex frequency analyzer 2 into a digital signal, recognizing the digital signal by the central controller 1, and decoding the telephone number dialing transmitted to the line; And when the decrypted telephone number matches the stored telephone number, blocking the call by opening the line for a predetermined time in the mode switching switch. The method of claim 1, wherein the step of deciphering the telephone number dialing transmitted to the line by configuring a general telephone number transmitter in connection with the central control unit 1 without converting the complex frequency transmitted to the line into a digital signal. Method characterized by consisting of. A method according to claim 1, characterized in that the step of switching to the use mode or the command mode using a command composed of a telephone control signal without using the mode switching switch (8) is configured.