KR930004920B1 - Dual tone multi-frequency signal generator for telecommunications - Google Patents

Abstract

The dual tone multi-frequency signal generator for executing the tele-control function for the mechanical telephone comprises: a key matrix section (19) selecting the set for remote control through the telephone line; a micom (20) generating the control signal for outputting the message corresponding to the control function selected by (19); a DTMF generator (21) outputting the DTMF tone pulse signal and converting the dial key signal into the DTMF signal; a liquid crystal display (26) displaying the selected function; an LCD driver (25) driving the LCD.

Description

DTMF Signal Generator Circuit for Telecontroller

1 is a signal generator application state in accordance with the present invention.

2 is a rear view of a signal generator according to the present invention.

3 is a front view of a signal generator according to the present invention.

4 is a block diagram of a device setting key part in FIG.

5 is a DTMF signal generation circuit diagram for a telecontroller according to the present invention.

6 is an operation flowchart of a DTME signal generating circuit for a telecontroller according to the present invention.

* Explanation of symbols for main parts of the drawings

1: phone base 2: handset

3: transmitter 4: signal generator

5: speaker 6: battery holder

7: power switch 8: LCD

9: reservation key 10: cancellation key

11: Device setting key part 12: Off key

13: On key 14: Record key

15: AM key 16: FM key

17: PM key 18: transmission key

19: key matrix part 20: micom

21: DTMF generator 22: amplifier

23: battery 24: databus

25: LCD driver 26: LCD

27: constant voltage circuit.

The present invention relates to the generation of DTMF (Dual Tone Multi-Freqency) signal for a tele-controller, and in particular, even a mechanical telephone can perform a telecontroller function and can be used without the user memorizing a device number and an operation number. The present invention relates to a DTMF signal generating circuit for a telecontroller.

Conventionally, in order to perform a telecontroller function, an electronic telephone capable of generating a DTMF signal should be used.

In addition, the user has to memorize the device number and the operation number as shown in the signal table of the telecontroller of Table 1.

TABLE 1

Signal Table of Telecontroller

Accordingly, an object of the present invention is to solve the disadvantages caused by the conventional telecontroller autonomy, and the apparatus of the present invention for a telecontroller DTMF signal generator is as follows.

First, the structure of the apparatus of the present invention is shown in FIG. 2, the rear of which is a speaker 5, a battery holder 6 and a power switch 7, the front is shown in FIG. LCD (8), Reserved Key (9) Cancel Key (10), Device Setting Key (11), Off Key (12), On Key (13), Record Key (14), AM Key (15), FM Key (16), PM key 16, PM key 17 and transmission key 18 are attached.

Here, the device setting key unit 11 is composed of the device name and the corresponding key capable of tele control as shown in FIG.

FIG. 5 is a circuit diagram for generating the DTMF signal for the telecontroller, and is composed of a plurality of keys around the microcomputer 20, and the key input by the output port Pout and the input port Pin is determined. There is a matrix portion 19 and the LCD driver 25 and the LCD 26 are connected via a data bus 24.

There is also a DTMF generator 21, an AMP 22 and a speaker 15.

The battery 23 is applied to the constant voltage circuit 27 through the power switch 7 from which power is supplied to the microcomputer 20.

The operation state and the effect of the above-described technical configuration will be described in detail with reference to the signal generator application state diagram shown in FIG. 1.

First, the user makes a call to a desired place for telecontrol, and then operates a signal generator 4 to generate a DTMF signal toward the talker 3 to perform a telecontrol function.

At this time, the signal generator 4 has a front surface thereof as shown in FIG. 4 so that a function desired by the user is displayed on the LCD 8, and the device setting key part 11 is a device button to be used by the user as “TV, VCR, RAC,… And so on.

Also, reserved key (9), cancel key (10), off key (12), on key (13), recording key (14), AM key (15), FM key (16), PM key (17), transmission There is a key 18 to generate a DTMF signal for the telecontrol function by pressing the desired key and the signal generated is transmitted through the speaker 5 shown in the rear view of FIG.

In addition, as described above, Table 1 shows the device number and operation number in detail, and DTMF signals corresponding to the number are shown in Table 2 below.

TABLE 2

DTMF Signal Table

In addition, in the circuit diagram shown in FIG. 5, the dry cell 23 is located in the electric holder 6 of FIG. 2 and is supplied to the power of the microcomputer 20 via the power switch 7 and the constant voltage circuit 27.

Each key of FIG. 3 is input to the microcomputer 20 through the key matrix unit 19.

These inputs are displayed on the LCD driver 25 and the LCD 26 via the data bus 24 by an algorithm such as the flowchart shown in FIG. 6, the DTMF generator 21, the amplifier 22, and the speaker 4 Is transmitted as a beep.

6 shows the operation algorithm of the signal generator 4, and the overall operation is to store the data of the corresponding key when the user presses the desired key pressure and the microcomputer 20 displays the control information corresponding to the data. Display on (26) and wait for the next data depending on whether the transmit key 18 has been pressed or generate a DTMF signal for that data with the speaker 5, if the user presses the transmit key 18 in FIG. The DTMF signal corresponding to the key input data is output to the speaker 5 through the amplifier 22 of FIG.

If the cancel key 10 of FIG. 3 is input before the transmission key 18 is pressed during data input, the data recorded up to then is erased and the new key waits for input.

As a result, the key input desired by the user is stored in sequence, and when the transmission key 18 is inputted, the data is converted into DTMF signals and transmitted to the speaker 5 in turn.

As described above, the present invention can be used for a mechanical telephone, and is a useful invention that provides a DTMF signal generator for a tele-controlled menu that can be used without having to memorize operation numbers and device numbers.

As such, the DTMF signal generator for a telecontainer according to the present invention can perform a telecontrol function even with a mechanical telephone, and there is an effect of performing a desired function without having to memorize an operation number and a device number used at this time. .

Claims (1)

A message corresponding to the control function is generated when a dial key signal corresponding to a function selected by the key matrix unit 19 for selecting a device for remote control via a telephone line and the device selection key of the key matrix unit 19 is generated. A microcomputer 20 for generating a control signal for outputting a signal, a DTMF generator 21 for converting a DTMF signal from a dial key signal, and outputting a DTMF tone pulse signal, an LCD 26 for displaying a selected function, and the microcomputer 20. A DTMF signal generator for a telecontroller, comprising a LCD driver 25 for receiving a control signal for displaying a selected function from the 20 and driving the LCD 26.