KR890001849Y1 - Remocon signal detecting circuit - Google Patents

Abstract

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Description

Remote control signal detection circuit of telephone answering machine

1 is an implementation circuit diagram of the present invention.

2 is a voltage waveform diagram in each part of FIG.

3 is an algorithm showing the operation control function of each deck by the microcomputer in FIG.

* Explanation of symbols for main parts of the drawings

1,1 ': amplifier 2: filter

3: Level adjuster 4: Tow Decoder

5: Micro Computer OP1, OP2: OP Amplifier

R1-R11: Resistor C1-C10: Capacitor

D1, D2: Diode VR: Variable resistor

N1, N2: Inverter

The present invention relates to a remote control signal sensing circuit for sensing a remote control signal of various components in an automatic answering device using a remote control, particularly a telephone answering device employing a microcomputer as a system controller.

The answering phone can record the contents of an incoming call when the receiver is absent, and the receiver can check the recorded contents directly or check the recording by the remote control function using an external telephone. It is a kind of telephone.

Such an automatic answering device generally includes an OGM-only deck on which an outgoing message (hereinafter referred to as OGM) and an external sender's message are recorded. ICM dedicated deck for recording (hereinafter referred to as ICM), the playback and recording function by these two decks are controlled by the system controller micom.

3 is an algorithm showing the control function of the deck by the microcomputer. When the bell signal is inputted, the OGM deck is set as the regenerative mode. After the sound is sent, it outputs the OGM indicating that it is going to be recorded, and afterwards emits a beep and stops the OGM-only deck, while recording the ICM input from the caller by setting the ICM-only deck as the recording mode. If the input of the ICM is completed and the input of the ICM is completed, the ICM deck is stopped.

On the other hand, in order to check the ICM recorded on the answering machine using an external telephone, the user controls the function of the answering machine by sending a remote control signal to the handset of the external telephone. The remote control signal detection circuit of the response device does not detect signals of complex frequency components having different frequencies, but merely detects signals of one frequency component and performs only a simple function according to them. The microcomputer often malfunctions, and when the remote control from outside is used to control the function of the telephone answering device, the microcomputer is unable to detect the remote control signal due to the deterioration of the input signal.

The purpose of the present invention is to detect and decode the remote control signal of two complex frequencies input from the outside through the telephone line to solve the above-mentioned closure and supply the signal to the microcomputer to operate the function accordingly. As well as to provide a remote control signal detection circuit to maintain a constant level of the received signal at all times even when operating the remote control from a remote, as will be described in detail the configuration, operation and effects of the present invention do.

1 is an implementation circuit diagram of the present invention, in which a secondary side of a typical line transformer T is set by a resistor 1 comprising resistors R2, R3, capacitor C1, and OP amplifier OP1. Is connected to a filter section 2 consisting of a variable resistor (VR), a capacitor (C2) (C3), a resistor (R4), and an OP amplifier (OP2), and the output terminal of the filter section (2) is connected to a resistor (R5) and Through the capacitor C4, the amplifying unit 1 'made of the amplifying transistors Q2 and Q3, the resistors R9 and R10 and the coupling capacitor C8 is connected and at the same time, the resistors R6 and R7 And a level adjuster (3) consisting of a transistor (Q1), a capacitor (C5-C7) and a diode (D1), and a diode (D2), and the output terminal of the amplifier (1 ') is coupled to a coupling capacitor (C9) and a resistor. (R11) and condenser (C10) are connected to the TONE decoder (4) via a series connection, and the output terminal of this decoder (4) is connected in series with each inverter (N1) (N2). Through the input port of a conventional microcomputer (5).

B + is the DC power input terminal, R1 is the resistance, and TP is the telephone line.

When a remote control is contacted to a telephone transmitter from outside, and a signal for controlling the function of the telephone answering device is transmitted, this signal is input to the circuit of the present invention through a telephone line (TP).

The control signal according to the present invention is composed of a complex frequency signal in which two frequencies (for example, 2,920 kHz and 2,000 kHz) are combined with each other, and this signal passes through the light lance (T) and then the resistance in the amplifier 1 The signal is amplified by the OP amplifier OP1 through R2 and the condenser C1, and then input to the filter unit 2. The output of the OP amplifier OP1 is as shown in FIG. Analog signal waveform with complex frequency.

Only one frequency is selected through the filter unit 2 such as 2,920 kHz and 2,000 kHz. For example, the circuit constant is adjusted to select only 2,920 kHz and remove the 2,000 kHz. When the output of the filter unit 2 is as shown in FIG. 2 (b), the selection frequency is adjusted by varying the variable resistor VR to increase only the input level of the signal.

The output of the filter unit 2 is amplified in two stages by the transistors Q2 and Q3 in the amplifying unit 1 '. In this case, the input signal level is reduced by remote control transmission from a remote location. When the signal level output through the collector of transistor Q2 is lower than the operating voltage of the transistor Q3 at the next stage, the level adjuster 3 is operated so that the transistor Q1 in the level adjuster 3 is turned on. On, accordingly, the operation of each of the transistors Q2 and Q3 in the amplifier 1 'is compensated for, so that automatic level adjustment is performed to compensate the input signal level above a predetermined level.

On the other hand, the output signal amplified by the transistor Q3 in the amplifier 1 'is input to the decoder 4 through the coupling capacitors C8, C9 and the like and decoded. The output of the coder 4 becomes a digital pulse waveform in which the 2,920 kHz signal is displayed at the 'low' level as shown in FIG.

This digital waveform is again inputted to the microcomputer 5 through the inverters N1 and N2 in the waveform-shape state as shown in FIG. 2D, whereby the microcomputer 5 transmits this digital signal. It detects and controls the function of the telephone answering device.

As described above, the present invention detects and decodes a remote control signal of two complex frequencies so that the Michael computer in the telephone answering device can detect the microcomputer from malfunctioning by inputting different signals of various components. By automatically compensating the input level of the received signal from a distance above a certain level, it is a useful design to improve the reliability of the product by preventing the microcomputer's inability to detect the signal due to the reduced level of the received signal.

Claims (1)

An amplifier (1) comprising an OP amplifier (OP1), a resistor (R2), a resistor (R3), and a capacitor (C1) for amplifying a signal of a remote frequency of a complex frequency input through a conventional light lance (T), and the amplifier ( 1) a filter section 2 consisting of a variable resistor VR for setting a band of the composite frequency signal output from 1), a capacitor C2 (C3), a resistor R4, and an OP amplifier OP2, and the filter section 2 An amplifier 1 'consisting of transistors Q2 (Q3), resistors R9 (R10) and coupling capacitor C8 for signal amplifying the output of the filter; Of the level adjuster 3, which is composed of resistors R6, R7, transistors Q1, capacitors C5-C7, and diodes D1, D2, and the amplifier 1 '. Tone decoder 4 for decoding the output, and inverter N1 for waveform shaping the output of the toe decoder 4 and applying it to the input port of the ordinary microcomputer 5. Remote control signal detection circuit of the telephone answering device, characterized in that consisting of (N2).