KR950004840Y1 - Key phone circuit having wireless calling function - Google Patents

Abstract

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Description

Key phone circuit with wireless calling function

1 is a diagram of a key phone circuit having a radio calling function of the present invention.

2 is a wireless pager circuit diagram where a call is received from the first road.

* Explanation of symbols for main parts of the drawings

1: hand cell 2: keyboard

3: microprocessor 4: data converter

5: tone ringer 6: rom

7 modulator 8 oscillator

9: transmit power amplifier 20: detector

21: demodulator 22: decoder

23: comparator 24: local oscillator

25 switch 26 timer

27: oscillator 28: buzzer

The present invention relates to a wireless pager attached to a keyphone terminal, and more particularly, to a keyphone wireless pager suitable for enabling a user to make a phone call by detecting a ringing state of the terminal by the sound of the pager even when the user is at a distance. .

In the conventional key-phone terminal, which is generally used, when a user having a terminal enters an extension number in advance when the user moves to a place without the terminal, the system detects this and switches to the terminal of the extension number that has been input when an incoming ring state occurs in the terminal. The ring is ringed so that the user can make a telephone call at the terminal.

However, the above technique not only hassle to input the extension number of the terminal at the place to be moved to the user terminal every time the place is moved, but also does not answer the call even if the incoming ring rings if the input is not made. Can be.

Accordingly, the present invention has been devised to make a telephone call from a nearby terminal by wirelessly calling a user when a telephone comes by adding a wireless calling function to a keyphone in consideration of the defects according to the conventional keyphone wireless telephone as described above. The explanation is as follows.

First, the configuration of the present invention consists of a terminal and a pager for transmitting and receiving data therefrom. First, as shown in FIG. 1, the terminal includes a hybrid transformer for distinguishing transmission and reception in voice signals transmitted through transmission and reception lines. T1), amplifiers A1 to A3 for amplifying the transmitted audio signal to a small size, a hybrid transformer T2 for transmitting and receiving data with the keyphone main unit, and a data converter for interfacing with the microprocessor 3 ( 4), the keyboard unit 2 for inputting data from the user to the system, the tone ringer 5 for driving the speaker SP1 with the received signal, the system to control the microprocessor and (3), a modulator (7) for modulating the input pager distinction code into an FM signal, an oscillator (8) for oscillating a transmission frequency of 46 MHz, and an appropriate transmission output. A transmit power amplifier 9 which is adjusted by means of an antenna, a pager button SW1 for distinguishing between an antenna and a general function mode and a pager mode, and a ROM 6 for storing the coder number of the pager even when the keyphone power is turned on or off. It is composed.

On the other hand, the circuit of the wireless pager for transmitting and receiving data with the terminal is an antenna (ANT2) for receiving the 46MHz wireless signal transmitted from the keyphone, as shown in Figure 2, and amplifies the received signal to a certain level The amplifier A4, a local oscillator 24, a detector 20 for extracting the original 46 MHz to generate an intermediate frequency signal, a demodulator 21 for recovering the encryption code of the pager, and a serial encryption code. A decoder 22 for converting in parallel, a comparator 23 for comparing the received data with the data of the switch 25 having a password set, a timer for maintaining the output for a predetermined time with a single trigger input, and an incoming call. It consists of an oscillator 27 for ringing the buzzer 28 with a signal.

Referring to the operation and effect of the circuit of the present invention having the above configuration in detail as follows.

First, in the normal function mode in which the pager button SW1 of FIG. 1 is not pressed, the tone ringer 5 is a speaker like a conventional key phone without the microprocessor 3 generating a password for a pager call when the call is received. Drive SP1 to ring the incoming signal.

However, if the button SW1 of the pager is pressed, the coder number of the binary 6-byte code stored in the ROM 6 is modulated and oscillated and transmitted to the antenna ANT1. If the encrypted data is received by (ANT2) and the received number is the same as the number of the preset switch 25, the output of the comparator 23 is controlled so that the timer 26 is driven for a predetermined time and the oscillator 27 during that time. Is operated to ring the incoming signal to the buzzer 28.

At that time, when the user dials his keyphone extension number and a special code from a nearby terminal, the incoming call is converted to the terminal of the extension number and the call is made.

Therefore, when the wireless pager rings, the user can dial the extension number and the special code from any connected terminal.

As described above, even if the user leaves the seat within a certain range by using the keyphone wireless pager, the incoming call of the asset can be detected, which can significantly reduce the case of not receiving a call.

Claims (2)

Hybrid transformer (T1) for distinguishing transmission and reception in voice signals transmitted through transmission and reception lines, amplifiers (A1 to A3) for amplifying the transmitted audio signal to an appropriate size, hybrid for transmission and reception of data with keyphone main unit Drives the speaker SP1 with an incoming signal and a transformer T2, a data converter 4 for interfacing with the microprocessor 3, a keyboard unit 2 for inputting data from the user to the system A tone ringer (5) for controlling the system according to a pre-stored program, and a microprocessor (3), a modulator (7) for modulating the input pager distinction code into an FM signal, and oscillating a transmission frequency of 46 MHz. An oscillator 8, a transmission power amplifier 9 for adjusting the transmission output to an appropriate size, a pager button SW1 for dividing the keyphone into a general function mode and a pager mode, and on / off of the keyphone power Key telephone circuit having a wireless calling function, characterized in that in the ROM 6 for storing a password number of the pager, even when. The wireless pager of claim 1, wherein the radio pager comprises: an antenna ANT1 for receiving a 46 MHz wireless signal transmitted from a key phone, an amplifier A4 for amplifying the received signal to a predetermined level for detection, and a local oscillator 24. Detector 20 for extracting the original 46 MHz to generate an intermediate frequency signal, a demodulator 21 for recovering the encryption code of the pager, a decoder 22 for converting the serial encryption code in parallel, and receiving A comparator 23 for comparing the data to the data of the switch 25 having a password set, a timer for maintaining the output for a predetermined time with one trigger input, and an oscillator for ringing the buzzer 28 with an incoming signal ( 27) Keyphone circuit having a wireless call function, characterized in that.