KR100227728B1 - Telephone with secret number function - Google Patents

Abstract

In the case of using several telephone sets connected in parallel in a subscriber number, when a telephone call is established through an arbitrary telephone set and the telephone set of another telephone set is picked up, the function of the telephone set is transmitted to the telephone set via the handset A telephone system having a secret protection function capable of protecting a user's secret by outputting a predetermined melody, the telephone system comprising a plurality of telephones having a hook detecting means connected in parallel, A first hook detecting means provided at a rear end of the hook detecting means for outputting a signal of a predetermined level when an off hook is detected; Detecting means, sound sending means for sending out a predetermined sound, signal processing for a voice signal of a sender / receiver and side notes, Hook detecting means for detecting an off-hook from the first detecting means and an off-hook detecting means for detecting an off-hook from the first detecting means, And control means for controlling to drive the generating means to send out a predetermined sound.

Description

A phone with secret protection

1 is a block diagram showing an internal configuration of a general telephone;

FIG. 2 is a block diagram showing a telephone having a password function according to an embodiment of the present invention; FIG.

FIG. 3 shows the first and second hook detectors 31 and 32 in FIG. 2;

DESCRIPTION OF THE REFERENCE NUMERALS

1: Connection terminal 2: Ring signal detection unit

3: Ring generating part 4: Interface circuit

5: Handset 6: Switch

7, 34: Network circuit 8: Hook detector

10: Display section 11: Memory

12, 30: control unit 13:

14: Dual Tone Multi-Frequency (DTMF) generating circuit

31: first hook detecting portion 32: second hook detecting portion

33: melody generating section 101: light emitting display section

102: Display drive unit A: Parallel connection point

BF1-BF2: bidirectional buffer

The present invention relates to a telephone, and more particularly, in a case where a plurality of telephones are connected in parallel in a subscriber number, when a telephone call is established through an arbitrary telephone and the handset of another telephone is received, And a secret protection function for outputting a predetermined melody through the handset to protect the secret of the user.

FIG. 1 is a block diagram showing an internal configuration of a general telephone.

Reference numeral 1 denotes a ring signal connection unit for connecting an external trunk line, 2 denotes a ring signal detection unit for detecting a ring signal applied from the trunk unit of the caller through the trunk connection terminal 1, An interface circuit 4 for performing interface functions of communication signals input / output to / from the inside / outside of the apparatus, and a ring signal generator 4 for inputting / Which is constituted by a bridge diode for rectifying the power supplied from the exchange.

Reference numeral 5 denotes a handset. Reference numeral 6 denotes a switching unit for on / off switching on / off based on a control signal of the control unit 12 to be described later to open / close a communication path between the telephone and a trunk line. The switching unit is turned on and is in a talk enabled state.

Reference numeral 7 denotes a switch for amplifying a voice signal of a sender applied from a partner through the interface circuit 4 and the switching unit 6 or a voice signal of a user applied through the handset handset 5 to a predetermined level And signal processing for side tones. Reference numeral 8 denotes a hook detecting unit for detecting the ON or OFF state of the switching unit 6 in response to on-hook or off-hook of the hook switch.

Reference numeral 10 denotes a display unit for informing the user of the current operation state of the telephone set. The display unit 101 includes a light emitting display unit 101 and a display driving unit 102 for driving the display unit 101. Reference numeral 11 denotes a normal dialing function, And a memory 12 for controlling the entire apparatus based on the signals detected by the ring signal sensing unit 2 and the CO line sensing unit 41. [

Reference numeral 13 denotes a keypad provided with numeric and function keys used for dialing or selecting a specific function by the user, reference numeral 14 denotes a keypad for inputting a predetermined key input through the keypad 13, And outputs a DTMF signal corresponding to the DTMF signal.

That is, in the apparatus having the above-described configuration, when a call is received from the outside, a ring signal is sensed through the ring signal sensing unit 2 or the user hooks up the handset to make a call, When the off-hook is detected, the control unit 12 controls the switching unit 6 to control the user to make a call at any time by opening the communication path.

However, in a case where the telephone sets having the above-described configuration are connected in parallel, even if a user is making a call using an arbitrary telephone, a person can deliberately overhear the conversation using another telephone connected in parallel with the telephone So that it is possible to intercept the call using a predetermined sound.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a telephone system in which, when a plurality of telephones are connected in parallel in one subscriber number, The present invention provides a telephone having a password function that can temporarily protect a user's secret by outputting a predetermined melody through the handset.

In order to achieve the above object, a telephone set having a secret protection function according to the present invention is a telephone system in which a plurality of telephones having hook detection means are connected in parallel. The telephone system is provided at the front end of the hook detection means, A second hook detecting means provided at a rear end of the hook detecting means for outputting a signal of a predetermined level when an off hook is detected, a second hook detecting means provided at a rear end of the hook detecting means for outputting a predetermined level, A network circuit for performing sound processing for a voice signal and a side tone of a sender / receiver, and an off hook detecting means for detecting an off hook from the first detecting means, Controls the network circuit to cut off the voice signal of the sender and the receiver, and controls the melody generating means to drive and control a predetermined sound And control means for controlling the lock is characterized in that configured.

That is, according to the above-described configuration, even if a plurality of telephones are connected in parallel, the contents of a user's call using the arbitrary telephone can not be heard by other telephones.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram showing an internal configuration of a telephone having a secret protection function according to an embodiment of the present invention. In FIG. 2, the same reference numerals are assigned to the same parts as those of the first embodiment, and a detailed description thereof will be omitted.

2, reference numeral 31 denotes a first hook detecting unit which is provided at the front end of the switching unit 6 to detect on / off of the switching unit 6. This is a tip line detecting unit for connecting a switching unit and a telephone, The hook switch is turned on or off in any of the telephones connected in parallel based on the change in the voltage applied to the ring line and the ring line to detect the ON or OFF state of the corresponding switching unit 6 And reference numeral 32 denotes a second hook detector provided at the rear end of the switching unit 6 for detecting the ON or OFF state of the switching unit 6 in a specific telephone.

The first hook detecting portion 31 includes two transistors Q1 and Q2 whose collector terminals are coupled to the power source voltage Vcc as shown in FIG. The collector terminal of the first transistor Q1 is coupled to the base end of the second transistor Q2 so that the output OUT is at a high level when the input IN is in a steady state (for example, when the potential difference between the tip line and the ring line is 48 V) (For example, when the potential difference between the tip line and the ring line becomes 6V by the user using the handset), the output signal outputs a low level signal.

As shown in FIG. 3 (b), the second hook detector 32 includes one transistor Q3 whose collector terminal is coupled to the power supply voltage Vcc, so that the input IN is in a normal state (For example, in the on-hook state), the output signal OUT outputs a low level signal when the output OUT keeps the high level signal and goes off-hook.

2, reference numeral 33 denotes a melody generating unit for converting the data stored in its own memory into a predetermined melody according to a control signal of a control unit 30 to be described later and transmitting it, And amplifies the user's voice signal applied through the handset handset 5 to a predetermined level and performs signal processing on side tones and the like in accordance with the control signal of the control unit 30, And outputs a predetermined melody inputted from the melody generating section 33 to the receiver section of the handset 5 while blocking the sender's voice signal and the user's voice signal.

Reference numeral 30 denotes a control unit for controlling the entire apparatus, which drives the melody generator 33 and the network circuit 34 based on the signals input from the first and second hook detectors 31 and 32 And reference character A denotes a connection point of a telephone connected in parallel.

Next, an embodiment according to the present invention will be described.

As described above, in general, when the user picks up the telephone, the unshown hook switch is off-hooked to turn on the switching unit 6 to form a communication path. Similarly, when a plurality of telephones are connected in parallel Similarly, when the user receives a handset of an arbitrary telephone (called telephone A), the switching unit 6 is turned on to form a communication path.

The second hook detecting unit 32 detects an off-hook state when the switching unit 6 is turned on. When the second hook detecting unit 32 becomes off-hook, the second hook detecting unit 32 outputs a signal of a predetermined low level to the control unit 30 do.

The first hook detector 31 connected in parallel to the second hook detector 32 of the telephone also changes the voltage applied from the switcher 6 to the switching unit 6, Level output signal is output through its output terminal as it changes from 48V to 6V and the gel hook detection unit 31 of all other telephones connected in parallel with the telephone also outputs a low level signal through the output terminal OUT And outputs it to the control unit 30.

Here, the output signal of the first hook detector 31 outputs a low level signal to the output terminal OUT when the handset 5 is in a state of being in a communication state (OFF-HOOK), for example.

Then, when the first detecting unit 31 outputs a low level output signal and another user loads an arbitrary telephone except the telephone A, the control unit 30 drives the network circuit 34 to control the telephone line from the CO line And controls the melody generating unit 33 to drive the melody generating unit 33 to send a predetermined melody to the network circuit 34. In addition,

The control unit 30 controls the network circuit 34 to output the melody input from the melody generating unit 33.

Therefore, according to the embodiment, even if a plurality of telephones are connected in parallel, it is possible to protect the contents of a user's call by not allowing the other telephones to listen to the contents of the user using the telephone.

The present invention is not limited to the above-described examples, and various modifications may be made without departing from the technical scope of the present invention.

As described above, according to the present invention, when a plurality of telephones are connected in parallel in one subscriber number, when a handset of another telephone is received in a state in which a call path is formed through an arbitrary telephone, In addition, by outputting a predetermined melody through the handset, a telephone having a secret protection function that can protect the secret of the user can be realized.

Claims (1)

A first hook detection means for detecting an off hook state of another telephone based on a signal level applied through an interface circuit from a trunk line, and a second hook detection means for detecting an off hook state of the telephone set A sound generator for generating a predetermined melody sound, a sound signal applied from a CO line on the basis of a predetermined control signal to or from a handset, a sound signal applied from the handset to a CO line, And a network circuit for sending out melody tones applied from the tone generating means to a trunk line or a handset, and a network circuit for transmitting the melody tones to the trunk line or the handset by the first hook detecting means, When it is detected by the hook detection means that the present telephone is off-hooked, the network circuit is controlled so that the sound between the old line and the handset And a controlling means for controlling the tone generating means to be driven and sending out melody tones output from the tone generating means to the handset of the present telephone.