KR930006856B1 - Method of ringing a specific person - Google Patents

Abstract

The method is for performing privacy ring function without connecting telephone line using a secret code to save the charge for unnecessary telephone calls. It includes a ringer circuit (2) for generating ringer signal to drive a buzzer, a ring detector (3) for detecting ring signal, a central processing unit (4) for controlling ring tone outputting, the 1st analog switch (5) for applying ringer signal to a speaker (9) or an interface section (6) according to the ring mode selected by an user, the interface section (6) for transferring the ringer signal to the CPU (4), and the 2nd analog switch (8) switched by the control of the CPU (4).

Description

How to perform privacy ring function

1 is a flow chart of a conventional privacy ring function control.

2 is a system block diagram according to the present invention.

3 is an output waveform diagram of the ring detector 3 during the second diagram.

4 is a flowchart of a privacy ring function control according to the present invention.

* Explanation of symbols for main parts of the drawings

2: ringer circuit 3: ring detector

4: CPU 5,8: 1-2 Analog Switch

6 interface 7 amplifier

9: speaker

The present invention relates to a method of performing a privacy ring function without connecting a telephone line in a telephone.

In general, a privacy ring function is a function of ringing a ring signal by distinguishing between a general person and a specific person so that a user does not answer a call other than a specific person.

Conventionally, as shown in the flowchart of FIG. 1, a ring signal is detected in step 1a and step 1b is performed. In step (1b), it is checked whether the privacy ring mode is performed, and if it is not the privacy ring mode, normal ring service is performed in step (1c), and the ring signal is output through the speaker, and in step 1d, if the privacy ring mode is performed, . In step (1d), the telephone line is automatically connected and step (1e) is performed. In step (1e), it is checked whether the input secret code matches the set secret code. If the secret code does not match, in step (1f), the absence guidance message is sent or the telephone line is disconnected. Follow the steps. In the step (1g), the privacy ring tone is sent out.

In the conventional method of performing a privacy ring function as shown in FIG. 1, when a ring is detected, when a telephone line is directly connected and a secret code is not recognized, a call cannot be made and only a call charge is added, and a privacy code is used. Since the ring function is performed, a DTMF receiver for reading a secret code is added, which causes a complicated hardware configuration.

It is therefore an object of the present invention to provide a method for performing a privacy ring function without connecting a telephone line in a telephone.

Another object of the present invention is to provide a method for preventing unnecessary addition of call charges by performing a privacy ring function without using a secret code in a telephone.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a system block diagram according to the present invention. The ringer circuit 2 outputs a ringer signal for ringing a buzzer by inputting a ring signal from a trunk line, and the ringer signal output from the ringer circuit 2. A ring detection unit 3 for detecting a ring signal, a CPU 4 for receiving a ring detection signal from the ring detection unit 3 to determine a privacy ring mode, and outputting a privacy ring tone, and the ringer circuit 2 Transformer 10 to induce the ringer signal applied to the primary coil from the secondary coil to the secondary coil, and the ringer signal induced to the secondary coil of the transformer 10 when the normal ring mode is selected by the user's selection A first analog switch 5 for outputting the ringer signal induced in the secondary coil of the transformer 10 to the interface unit 6 when the privacy ring mode is selected, and the first analog switch ( 5) select from An interface unit 6 for inputting and outputting the output ringer signal to the CPU 4, an amplifier 7 for amplifying and outputting a privacy ring tone signal output from the CPU 4, and the amplifier 7 The second analog switch 8 is switched on by the control signal of the CPU 4 to output the privacy ring tone signal amplified and output to the speaker 9.

3 is an output waveform diagram of the ring detector 3 during the second diagram.

An embodiment of the present invention based on the above configuration will be described with reference to FIGS. 2-3. First, when the user selects the first analog switch 5 as the privacy ring mode in order to perform the privacy ring function, the telephone is externally connected. The ring will not ring when caught. Therefore, when a specific person who knows how to use the privacy ring function from outside calls, the ringer circuit 2 inputting the ring signal from the trunk line outputs a ringer signal for ringing the ring buzzer. The ring detector 3, which inputs the ringer signal output from the ringer signal 2, detects a ring signal such as the section A in FIG. 3 and informs the CPU 4 of the ring signal. At this time, when a caller from outside is detected the ring back tone a certain number of times (about 2 times), he hangs up the phone and then calls again after a predetermined time (about 3-4 seconds). Then, the ring detection unit 3 detects a ring signal such as section 3B in FIG. 3 and informs the CPU 4. At this time, the CPU 4 determines the privacy ring signal by combining the first sensed ring signal and the second sensed ring signal, and outputs a privacy ring tone signal.

The privacy ring tone signal output from the CPU 4 is amplified and output by the amplifier 7. At this time, the CPU 4 generates a switching-on control signal to switch on the second analog switch 8. As a result, the privacy ring tone signal amplified and output from the amplifier 7 is transmitted through the speaker 9, so that the user answers the call.

4 is a flowchart of a privacy ring function control according to the present invention, in which a first process of checking whether a privacy ring mode is input when a ring signal is input, and a second process of performing a general ring service when the privacy ring mode is not present in the first process And a third step of checking whether the ring input period coincides with the privacy ring sequence in the privacy ring mode in the first step; and a privacy ring tone when the ring input period coincides with the privacy ring sequence in the third step. The fourth process is to send.

The operation of controlling the privacy ring function in the above-described CPU 4 of FIG. 2 will be described with reference to FIG. 4. First, in step 4a, the CPU 4 inputs a ring detection signal from the ring detector 3. If the ring detection signal is input, the process (4b) is performed. In step (4b), the CPU 4 checks whether a ringer signal is input from the interface unit 6. That is, if it is not selected as the privacy ring mode by checking whether it is selected as the privacy ring mode, the general ring service is performed in step 4c, and if it is selected as the privacy ring mode, step 4d is performed. In step (4d), the CPU 4 checks whether the period of the ring detection signal output from the ring detection unit 3 matches the privacy ring sequence, and performs step (4e) if it matches the ring sequence. In step (4e), the CPU 4 generates a switching-on control signal to turn on the second analog switch 8 and transmit a privacy ring tone. The privacy ring tone is then amplified by the amplifier 7 and applied to the speaker 8 so that a ringing sound is generated.

As described above, by performing a privacy ring function without connecting a telephone line, there is an advantage in that unnecessary call charges can be prevented from being added and a complete privacy ring function can be satisfied.

Claims (1)

A ringer circuit (2) for inputting a ring signal from a trunk line to output a ringer signal for ringing a buzzer; a ring detector (3) for inputting a ringer signal output from the ringer circuit (2) to detect a ring signal; The ringer circuit 2 receives the ringer signal output from the ringer circuit 2 to determine the privacy ring mode, and when the ring detection signal input from the ring detector 3 matches the privacy ring sequence, the speaker 9 outputs a privacy ring tone to the speaker 9. CPU 4 outputs to the speaker 9 and a ringer signal output from the ringer circuit 2 when the normal ring mode is selected by the user. The ringer circuit is output when the privacy ring mode is selected. The first analog switch 5 for outputting the ringer signal outputted from (2) to the interface unit 6 and the ringer signal selectively outputted from the first analog switch 5 are inputted to the CPU 4. Phosphorus for delivery to In a method of performing a privacy ring function of a telephone having at least a interface unit 6, a privacy ring mode is selected by selection of the first analog switch 5 when a ring detection signal is input from the ring detector 3. A privacy ring mode check process for checking whether a signal is selected and a period of a detection signal input from the ring detector 3 when the privacy ring mode is selected in the privacy ring mode check process matches the privacy ring sequence. And a privacy ring tone transmission process for transmitting a privacy ring tone to the speaker 9 when the ring sequence inspection process is performed and the privacy ring sequence is matched in the ring sequence inspection process. .