KR930007929Y1 - Redialing circuit in telephone - Google Patents

Abstract

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Description

Redialing Circuit of Telephone

1 is a block diagram of a redialing circuit of the present invention.

2 is a detailed view of a redialing circuit of the present invention.

3A-F are waveform diagrams of FIGS. 1 and 2.

* Explanation of symbols for main parts of the drawings

1: rejection of tone ring 2: interface unit

3: keyboard part 4: dialing control part

4A: storage unit 5: handset

5A: Songhwa Unit 5B: Sign Language Unit

6: voice processing unit 7: power supply

8: decoder 9: counter

10 hook control unit 11 reset unit

12: eraser 13: mono-multi

HSW: Hook switch L ₁ , L ₂ : Slow

FET: Field Effect Transistor

The present invention relates to a redialing circuit of a telephone for redialing a telephone number of a counterpart after a predetermined time when a user who is dialed to make a call is busy.

In general, when a user makes a telephone call with the other party, the user lifts the handset of the telephone to turn off the hook switch, and dials the telephone number of the other party to call by authoring the numeric keys on the keyboard.

At this time, when the dialing counterpart is in a call, a busy tone is sent to the user's telephone dialed by the switch at a predetermined time interval. In this way, when the counterpart dialed by the user is in a call, the conventional telephone is hooked by the user. On and off again after operating the keyboard to dial the phone number of the other party has a defect that gives the user a hassle.

Then, the user stores the dialed telephone number in the storage unit, and when the dialed party is busy, the user switches the hook switch on and off, and then presses the saf key (#), which is the redialing key of the keypress unit, to store the dialed telephone number. In some cases, the phone number stored in the unit is output to redial the call counterpart, but there is also a combination in which the user must operate the keyboard unit and the hook switch when the counterpart is busy.

The present invention, in view of the above-mentioned deficiencies, detects a busy tone input from an exchange when a user dialed by a user is busy, automatically turns on and off a hook switch, and redials the other party's telephone number. It will be described in detail with reference to the accompanying drawings as follows.

FIG. 1 is a block diagram of a redialing circuit of the present invention, and FIG. 2 is a detailed view. As shown in FIG. ₁ , a ringer signal input from a hook switch HSW and lines L ₁ and L _{2 is} connected to a speaker SP. And an interface unit 2 comprising a tone ringer rejection unit 1 for outputting a signal), a symmetric zener diode VRD, a bridge diode BD, and a zener diode ZD for interfacing signals between the lines L ₁ and L ₂ . A dialing control unit 4 for storing the dialed telephone number by operating the keyboard unit 3, and for outputting a dialing signal to the lines L ₁ and L ₂ , and a telephone unit of the handset 5. the track by processing the audio signal that is input to _{(5A) (L 1, L} 2) to the output bin with the addition voice processing unit for outputting a line (L _1, L ₂₎ hydration unit (5B) processes the audio signal input to the in the (6) phone, a full operating voltage to the power line (L _1, L ₂₎ through the interface unit (2) Sign language unit in the regulator (REG), a diode (D _1, D ₂₎ and a condenser with a power source (7) to (C _3, C _4), the voice processing unit 6 for supplying the (Vcc _1, Vcc ₂₎ ( A decoder 8 composed of a decoding integrated device IC ₁ , a variable resistor VR ₁ , and a capacitor C ₅ -C ₇ , which decodes a busy signal output to 5B) and outputs a pulse signal; A counter 9 for counting an output signal of 8), a counter 9 for counting an output signal of the counter 9, and the hook switch HSW and an interface unit according to the output signal of the counter 9; (2) a hook control unit (10) comprising a resistor (R ₃ ), a transistor (TR ₁ ), a relay (RL ₁ ), a relay switch (RL ₁₁ ), and a diode (D ₃ ) to open a connection between the counter ( The variable resistor VR ₂ , the capacitor C ₈ , and the resistors R ₄ and R _{5 for} delaying the output signal of 9) for a predetermined time and then applying a reset signal to the reset terminal RST of the counter 9. ) and an inverter (I _1, I ₂₎ The reset unit 11, and a resistance (R ₆₎ and a transistor (TR, which in accordance with the output signal of the counter 9 is tongha mids output from the voice processing unit 6 does not input to the decoder 8 ₂ ) an eraser (12), a noar gate (NOR ₁ ), a capacitor (C ₉ ), a variable resistor (VR ₃ ), and an inverter (I ₃ ) for shaping the output signal of the rivet unit (11). A monolithic 13 and a field effect transistor FET which short-circuit both terminals of the saf key KSW, which is a redialing key of the keyboard unit 3, are composed of a relay. When the relay RL ₁ is driven, the relay is driven. The switch RL ₁₁ is opened, and the hook switch HSW causes the movable terminal to be shorted to its one fixed terminal a when lifting the handset 5, i.

When described in detail with reference to the waveform of Figure 3 the effect of the present invention configured as described above.

When the user puts down the handset 5 of the telephone and the ring switch signal is input through the lines L ₁ and L ₂ from the other party while the movable terminal of the hook switch HSW is shortened to the other fixed terminal b, The input ringer call is input to the tone ringer 1 through the hook switch HSW and through the capacitor C ₁ and the resistor R ₁ , so the tone ringer 1 is output to the speaker SP. When the handset 5 is lifted accordingly, the movable terminal of the hook switch HSW is short-circuited to one side of the calibration terminal a ₁ , and the lines L ₁ and L ₂ are hook switches HSW and relay switches RL _11. And the voice processing unit 6 are connected to the voice processing unit 6 through the interface unit 2, so that the voice signal inputted by the user and the user through the line L ₁ L ₂ from the other party is processed by the voice processing unit 6. The voice signal inputted by the user to the talk unit 5A is outputted to the sign language unit 5B. The document processing is transmitted over a line (L ₁ L _2).

On the other hand, when the user calls the other party, the user can lift the handset 5 of the telephone and short-circuit the movable terminal of the hook switch HSW to one fixed terminal a so that the power of the line L ₁ L ₂ After input to the regulator (REG) of the power supply section 7 through the hook switch (HSW), relay switch (RL ₁₁ ) and the interface (2) to a constant voltage and then diode (D ₁ ) (D ₂ ) and capacitor (C) ₃ ), (C ₄ ) to supply the operating power (Vcc ₁ ) (Vcc ₂ ), in this state, if the user dials the telephone number of the party to be called by operating the keyboard unit 3, dialing The control unit 4 stores the dialing signal of the telephone number according to the operation of the keyboard unit 3 in the storage unit 4A, and also via the interface unit 2, the relay switch RL ₁₁ and the hook switch HSW. It outputs to (L ₁ , L ₂ ) and calls the other party to talk.

At this time, when the dialed party is busy, the call is input to the busy tone through the lines L ₁ and L ₂ , and the input busy tone is hookswitch (HSW), relay (RL ₁₁ ) and interface unit ( Since it is input to the voice processing unit 6 through 2), the voice processing unit 6 processes the busy tone and outputs the busy tone as shown in FIG. 3A.

Thus when the voice processing unit 6 busy tone is output, and the busy tone is a is outputted to the hydration unit (5B) In addition, since the input to the decoding integrated device (IC ₁₎ for via a capacitor (C _10), integrated device (IC ₁₎ 펄스 outputs a pulse signal as shown in FIG. 3B according to the busy tone, and the counter 9 counts the output FLE signal.

Here, assuming that the counter 9 is a binary counter, when five pulse signals are output from the integrated device IC ₁ , the counter 9 completes counting and outputs a pulse signal as shown in FIG. 3C. The output pulse signal is applied to the base of the transistors TR ₁ and TR ₂ through the resistors R ₃ and R ₆ , and is turned on. As the transistor TR ₂ is turned on, the audio processor 6 is turned on. ), The busy tone outputted from the ground) is grounded through the transistor TR ₂ and thus cannot be input to the integrated device IC _{1. As the} transistor TR ₁ is turned on, the relay RL ₁ is driven to switch its RL _11. When the low potential is outputted from the counter 9 after opening), that is, hooking on, the switch RL ₁₁ is short-circuited to hook off.

In addition, since the pulse signal output from the counter 9 is charged to the capacitor C ₈ through the variable resistor VR ₂ and is delayed for a predetermined time, the pulse signal is input to the inverter I ₁ through the resistor R ₄ . ₁ ) outputs a pulse signal as shown in FIG. 3d, and the output pulse signal is inverted as shown in FIG. 3e through the inverter I ₂ to reset the terminal RST of the counter 9 Since the counter 9 is reset, and the pulse signal output from the inverter I ₁ is input to the mono multi 13, the mono multi 13 receives the pulse signal as shown in FIG. The output pulse signal is applied to the field of the field effect transistor (FET) and is brought into a conductive state so that the sharp key (KSW) is short-circuited, and the dialing control unit 4 is stored in the storage unit 4A. The dialing signal to the line (L ₁ , L ₂ ) to call back the other party on the line. do.

As described in detail above, the present invention is called by dialing the other party's phone number automatically after a certain time when the dialing party is busy, so that the user has to rework the hook switch and keyboard unit when the other party is busy. There is an effect that can be removed.

Claims (1)

In a telephone composed of a tone ringer unit 1, an interface unit 2, a keyboard unit 3, a dialing control unit 4, a handset 5, a voice processing unit 6, a hook switch (HSW) and a speaker (SP) A decoder 8 for outputting a pulse signal according to the busy tone output from the voice processor 6, a counter 9 for counting the output signal of the decoder 8, and an output signal of the counter 9 The hook control unit 10 for controlling the connection of the hook switch (HSW) and the interface unit 2 and the output signal of the counter 9 are delayed for a predetermined time, and then the counter 9 is reset. A set unit 11, a cancellation unit 12 for preventing a busy tone output from the voice control unit 6 from being inputted to the decoder 8 according to the output signal of the counter 9, and the reset unit; The multi-neutral 13 for shaping the output signal of the unit 11 and the dialing control unit 4 immediately before the mono-multi 13 are output. Dialing a telephone number re-dial to re-effect transistor jengye die Ealing the telephone characterized in that it consists of (FET) circuit for a.