KR850002015Y1 - Automatic arrangements for answering for hold circuit - Google Patents

Abstract

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Description

Call maintaining circuit of telephone answering device

1 is a circuit diagram of the present invention.

2 is a waveform diagram according to FIG. 1.

* Explanation of symbols for main parts of the drawings

1: Ringsock transformer circuit 2: Amplification circuit

3: double voltage rectification circuit 4: microcomputer

5: Relay circuit RT: Ring Trance

LT: Line transformer RY: Relay

OR1: Oagate L1 to L4: Telephone line

The present invention relates to a call state maintaining circuit that maintains a state of communication between each other because a microcomputer detects this in response to a ring signal transmitted from a caller's telephone and operates a relay according to the answering machine.

Therefore, the present invention counts up to the number of ring signals set in advance as the ring signals through the telephone line transmitted from the caller's phone are input to the microcomputer, and then transmits a pulse signal to drive the relay circuit, thereby calling the caller's phone and the telephone. It is an object of the present invention to provide a call state maintaining circuit of an answering machine that maintains a call state between answering machines.

Hereinafter, the configuration, operation, and effects of the present invention will be described in detail with reference to the accompanying drawings.

The subject innovation is the resistance (R ₁₎ (R ₂₎ and capacitor (C ₁₎ and eda ringeop resistance ringeop transformer circuit (1) consisting of a transmitter _{(RT) (R 3 ~R 5} ) and a capacitor (C ₂₎ (C ₃ ) and a heavy circuit 2 composed of transistors TR ₁ and TR ₂ , and a resistor R ₆ (R ₇ ) and a capacitor C ₄ (C ₅ ) to the amplification circuit 2. And a double voltage rectifying circuit 3 composed of diodes D ₁ and D ₂ , and resistances to oracles OR ₁ directly connected to the double voltage rectifying circuit 3 and a known microcomputer 4. (Connected to a relay circuit 5 consisting of R ₈ (and transistor TR ₃ and relay RY), the line transformer LT and the telephone line L _{1 to} L _{2 on} the output side of the relay circuit 5. Terminals L ₃ and L ₄ are valid terminals that can be used for other functions of the telephone, and reference numerals A and B indicate the relay contacts.

1 shows a circuit diagram of the present invention having the above-described structure, in which a ring signal is transmitted from a caller's telephone to a telephone equipped with a telephone answering machine, that is, a ring signal from the caller's telephone (L ₁ ) (L ₂ ). Is input to the microcomputer (4), and accordingly counts up to the number of ring signals preset in the microcomputer (4), and then supplies a pulse signal to the relay circuit (5) so that the relay (RY) is driven to answer the telephone automatically. The device is connected to the telephone on which the device is installed and the caller's telephone is in an interactive state. That is, when the ring signal transmitted from the caller's telephone is input to the telephone line L ₁ (L ₂ ), the signal having the waveform as shown in (2-1) of FIG. 2 is transmitted to the resistance R ₁ of the ring transmission circuit ₁ . It is input to the primary side of the ring flow transformer (RT) through the (R ₂ ) and the capacitor (C ₁ ) and is induced to the secondary side, at which time the induced signal is applied to the base of the transistor (TR ₁ ) in the amplification circuit (2). since voltage (VCC) is a transistor (TR ₁₎ is operated in accordance with a signal applied to the base of said transistor (TR ₁₎ in the applied state to the collector of the resistance (R ₄₎ (R ₅₎ and the transistor (TR ₂₎ . Accordingly, since the transistor TR ₂ is turned on as the transistor TR ₁ is operated, the amplified ring signal passing through the amplifying circuit 2 is a resistor R ₆ (R ₇ ) and a capacitor C4 (C). ₅ ) and is converted into a large signal in the double-voltage rectifier circuit 3 composed of a diode (D ₁ ) (D ₂ ) and is output.

And, there is change in the output signal is high level is higher than a predetermined level as a step-like waveform, such as a second-degree (2-2) of the voltage doubler rectifying circuit 3, if the low level to the low state, this signal is the resistance (R ₇ Since the input signal is input to one input terminal of the OR gate OR ₁ while the other input terminal is grounded, the output signal of the OR gate OR ₁ is transmitted to the microcomputer 4 as a digital signal as shown in FIG. Is entered.

On the other hand, the microcomputer 4 counts the number of ring signals predetermined by the receiver according to the above-described operation, in which the ring signal set in the microcomputer 4 is counted correctly, and then the pulse signal of the microcomputer 4 is a relay circuit. It is sent out to (5). Then, the pulse signal is applied to the base of the transistor TR ₃ through the resistor R ₈ of the relay circuit 5, whereby the transistor TR ₃ is turned on so that the voltage VCC becomes the relay RY. Collector of transistor TR ₃ through the coil of. Since the ground is via the emitter, the contact A of the relay RY is changed from the off state to the on state.

Therefore, since the telephone lines L _{1 to} L ₂ are connected in a call state, the message signal recorded in the telephone answering machine is transmitted to the caller's telephone through the telephone loss L ₁ and L ₂ , message signal is applied to the telephone line (L ₁₎ of the relay (RY) contact (a) and the resistor telephone line (L ₂₎ (R ₉₎ a via through the primary side of rainteu rinse (LT) through and from which the The message signal transmitted to this vehicle side of the light lance LT is transmitted to a speaker or a recording tape. Therefore, the telephone is installed between the telephone and the telephone of the caller and the telephone of the caller is kept in a call state, and after the mutual communication ends, the pulse signal of the microcomputer 4 is not transmitted, so the relay RY contact of the relay circuit 5 is carried out. It is off and ready to receive ring signals from other phones.

As described above, the present invention accurately transmits a message signal to a speaker or a recording tape through a telephone line in response to a ring signal transmitted from the sender's telephone according to the number set in the microcomputer. It has the advantage of being connected to the intercom state of the phone.

Claims (1)

Resistor (R ₃ ) (R ₄ ) (R ₅ ) and condenser (C ₂ ) in a ring flow circuit (1) consisting of a resistor (R ₁ ) (R ₂ ), a capacitor (C ₁ ), and a ring recess (RT). An amplifier circuit 2 consisting of (C ₃ ) and transistors TR ₁ (TR ₂ ) is connected, and resistors R ₆ (R ₇ ) and capacitors C ₄ (C ₅ ) to the amplifier circuit 2. ) And a double voltage rectifier circuit (3) consisting of a diode (D ₁ ) (D ₂ ) and a resistance of the ora gate (OR ₁ ) and a known microcomputer (4) directly connected to the double voltage rectifier circuit (3). Call state of a telephone answering device connected to a relay circuit 5 consisting of (R ₈ ), a transistor TR ₃ , and a relay RY, and a line transformer LT coupled to the output of the relay circuit 5. Holding circuit.