KR19990074876A - Extension device of cordless phone - Google Patents

Abstract

The present invention relates to an internal telephone apparatus for a wireless telephone, comprising: an antenna for transmitting and receiving a high frequency signal, a mixing unit for mixing a high frequency signal input from the antenna with an oscillation frequency of a first oscillating unit and converting it into an intermediate frequency and an intermediate portion of the mixing unit. A receiver having a demodulator for demodulating the frequency and outputting an audible signal, a modulator for carrying and modulating a user's voice signal at the oscillation frequency of the second oscillator, and amplifying the modulated signal of the modulator and propagating it to the outside through the antenna An internal telephone apparatus for a wireless telephone comprising a transmitting unit having a power amplifying unit, comprising: a transmission frequency for transmitting and receiving a voice signal between internal communication devices by inverting the oscillation frequencies of the first oscillator and the second oscillator, respectively; An oscillation frequency switching section for switching the reception frequency to each other That is, the oscillation frequency switching for switching the transmission frequency and the reception frequency, respectively, so as to invert the oscillation frequencies of the first oscillator of the receiver and the second oscillator of the transmitter, so that voice signals can be transmitted / received between internal communication devices. By providing the unit, it is possible to normally transmit and receive voice signals between stationary communication apparatuses as well as exchange voice signals between fixed communication apparatuses, thereby increasing the efficiency of use of the wireless telephone.

Description

Extension device of cordless phone

The present invention relates to an extension telephone apparatus of a wireless telephone, and more particularly, to transmit and receive voice signals between the extension telephone apparatuses by inverting the oscillation frequencies of the first oscillator and the second oscillator of the receiver. An internal call apparatus for a radiotelephone having an oscillation frequency switching unit for mutually switching reception frequencies.

In general, a wireless telephone is composed of a fixed call device for transmitting and receiving a voice signal through a trunk line, and an extension call device for exchanging voice signals with the fixed call device through a wireless line.

In this case, the extension call device may transmit and receive a voice signal with the fixed call device, but voice signals between the extension call devices cannot be exchanged, which will be described with reference to FIG. 1. Is as follows.

1 is a block diagram showing an extension telephone apparatus of a general wireless telephone.

As shown in FIG. 1, an internal call apparatus of a wireless telephone includes an antenna ANT for transmitting and receiving a high frequency signal, a receiver 100 for demodulating and converting a high frequency signal input from the antenna ANT into an audible sound signal, and a user. And a control unit 300 for modulating a voice signal of the transmitter 200 to propagate to the outside through the antenna ANT, and to control the receiver 100 and the transmitter 200.

In this case, the receiver 100 may amplify an input filter unit 110 for removing a noise signal included in the high frequency signal input from the antenna ANT and a high frequency signal filtered through the input filter unit 110. A mixing unit 140 for mixing the high frequency amplifying unit 120, the high frequency signal of the high frequency amplifying unit 120 and the oscillation frequency of the first oscillating unit 130, and converting the high frequency amplifying unit 120 into an intermediate frequency, and the mixing unit 140. Demodulator 150 for demodulating the intermediate frequency of the output as an audible signal.

In addition, the transmitter 200 may include a modulator 220 configured to carry a user's voice signal at an oscillation frequency of the second oscillator 210, and a power amplifier configured to amplify the modulated signal of the modulator 220. 230 and an output filter unit 240 which removes a noise signal included in the modulated signal amplified by the power amplifier 230 and propagates to the outside through the antenna ANT.

In addition, the control unit 300 is a phase synchronization loop 310 for stabilizing the oscillation frequency of the first oscillator 130 of the receiver 100 and the second oscillator 210 of the transmitter 200, respectively, and the phase The microcomputer 320 controls the sync loop 310, the transmitter 200, and the receiver 100, respectively.

Referring to the operation of the extension call device of the wireless telephone having the above configuration as follows.

First, when a high frequency signal is transmitted from the fixed call device, the input filter unit 110 of the extension call device removes an unnecessary noise signal included in the high frequency signal input from the antenna ANT and then transmits the high frequency signal to the high frequency amplification unit 120. Will be authorized.

In the mixing unit 140, the oscillation frequency of the first oscillator 130 under the control of the microcomputer 320 and the phase synchronization loop 310 is mixed with the high frequency signal amplified by the high frequency amplification unit 120. The intermediate frequency is demodulated to an audible signal by the demodulator 150 and finally provided to the user as a voice signal.

On the other hand, the user's voice signal is modulated by the oscillation frequency of the second oscillator 210 under the control of the microcomputer 320 and the phase-locked loop 310 in the modulator 220 to be modulated by the power amplifier 230 and the output. After propagating to the outside through the filter unit 240, the fixed communication device and the wireless network are configured to exchange voice signals with each other.

By the way, the internal communication device of the radiotelephone according to the prior art which achieves the above-described configuration and operation can normally transmit and receive voice signals between the fixed communication devices, but the wireless communication network cannot be formed between the internal communication devices. There was a drawback in efficiency.

Accordingly, the present invention has been made in order to solve the above problems, and an object of the present invention is an oscillation frequency switching unit for switching between the transmission frequency and the reception frequency so as to transmit and receive voice signals between the internal communication devices, respectively. The present invention provides an internal telephone communication apparatus of a wireless telephone capable of normally transmitting and receiving voice signals between stationary telephone apparatuses as well as communicating voice signals between stationary telephone apparatuses.

1 is a block diagram showing an extension call apparatus of a typical wireless telephone.

Figure 2 is a block diagram showing an extension call device of a wireless telephone according to the present invention.

* Description of the symbols for the main parts of the drawings *

ANT: antenna 100: receiver

110: input filter unit 120: high frequency amplification unit

130: first oscillation unit 140: mixing unit

150: demodulator 200: transmitter

210: second oscillator 220: modulator

230: power amplifier 240: output filter

300: control unit 310: phase synchronization loop

320: micom 330: oscillation frequency switching unit

330a: inverter

The present invention for achieving the above object, an antenna for transmitting and receiving a high frequency signal, a mixing unit for mixing the high frequency signal input from the antenna to the oscillation frequency of the first oscillator and converting to an intermediate frequency and demodulating the intermediate frequency of the mixing unit A receiver having a demodulator for outputting an audible signal, a modulator for carrying and modulating a user's voice signal at an oscillation frequency of a second oscillator, and amplifying a modulated signal of the modulator, and amplifying the power propagated to the outside through the antenna An extension telephone call device of a wireless telephone comprising a transmitter having a transmission unit, wherein the oscillation frequencies of the first oscillator and the second oscillator are inverted, respectively, so that a transmission frequency and a reception frequency can be transmitted and received so that voice signals can be transmitted and received between the internal communication devices. Comprising an oscillation frequency switching unit for switching between It is made into the basic characteristic on the technical structure.

Hereinafter, a preferred embodiment of the wireless telephone according to the present invention will be described with reference to FIG.

Figure 2 is a block diagram showing an extension call apparatus of a wireless telephone according to the present invention, the same name and the same reference numerals will be used for the same configuration having the same operation as the conventional configuration.

As shown in FIG. 2, the internal telephone apparatus of the wireless telephone according to the present invention includes an antenna ANT for transmitting and receiving a high frequency signal and an input filter for removing a noise signal included in the high frequency signal input from the antenna ANT. The oscillation frequency of the first oscillator 130 is added to the high frequency amplification unit 120 and the high frequency signal of the high frequency amplifying unit 120 to amplify the high frequency signal filtered through the unit 110 and the input filter unit 110. A receiver (100) having a mixer (140) for mixing and converting to an intermediate frequency and a demodulator (150) for demodulating the intermediate frequency of the mixer (140) and outputting it as an audible sound signal; Modulation unit 220 for carrying on the oscillation frequency of the second oscillator 210 and the power amplifier 230 for maximum amplification of the modulation signal of the modulation unit 220 and the modulation amplified by the power amplifier 230 Job included in signal It made of and to remove the signal of the antenna (ANT), a transmission unit 200, an output filter unit 240 to propagate to the outside through a controller 300 for controlling the receiver 100 and the transmitter 200. The

At this time, the control unit 300 is a phase synchronization loop 310 to stabilize the oscillation frequency of the first oscillator 130 of the receiver 100 and the second oscillator 210 of the transmitter 200, respectively, and the phase The microcomputer 320 controls the sync loop 310, the transmitter 200, and the receiver 100, respectively.

The controller 300 inverts the oscillation frequencies of the first oscillator 130 and the second oscillator 210, respectively, so as to switch the transmission frequency and the reception frequency so that voice signals can be transmitted / received between internal communication devices. An oscillation frequency switching unit 330 is provided, and the oscillation frequency switching unit 330 includes an inverter 330a for inverting the oscillation frequency of the first oscillation unit 130 and the oscillation frequency of the second oscillation unit 210, respectively. .

Referring to the operation of the extension call device of the wireless telephone having the above configuration as follows.

First, since the configuration of the wireless network with the fixed communication device is the same as in the prior art, it will be omitted in order to avoid the troublesome explanation. Here, the voice signal exchange operation between the internal communication devices will be described as follows.

First, when a high frequency signal is transmitted from one extension telephone apparatus, the input filter unit 110 of the other extension telephone apparatus removes unnecessary noise signals included in the high frequency signal input from the antenna ANT, and then a high frequency amplification unit of the subsequent stage ( 120).

In the mixing unit 140, the oscillation frequency of the first oscillator 130 under the control of the microcomputer 320 and the phase synchronization loop 310 is mixed with the high frequency signal amplified by the high frequency amplification unit 120. The intermediate frequency is demodulated to an audible signal by the demodulator 150 and finally provided to the user as a voice signal.

On the other hand, the user's voice signal is modulated by the oscillation frequency of the second oscillator 210 under the control of the microcomputer 320 and the phase-locked loop 310 in the modulator 220 to be modulated by the power amplifier 230 and the output. After propagating to the outside through the filter unit 240, the fixed communication device and the wireless network are configured to exchange voice signals with each other.

Meanwhile, the oscillation frequency switching unit 330 under the control of the microcomputer 320 inverts the oscillation frequencies of the first oscillator 130 and the second oscillator 210, respectively, and transmits and receives a frequency for use of the single call device. In order to cope with the above, it is possible to exchange voice signals between each other by switching the transmission / reception frequency of each extension device.

As described above, according to the extension telephone apparatus of the wireless telephone according to the present invention, the oscillation frequency of the first oscillator of the receiver and the second oscillator of the transmitter is reversed, respectively, so as to transmit and receive voice signals between the extension telephone apparatuses, By providing the oscillation frequency switching unit for switching the reception frequency to each other, it is possible not only to exchange voice signals between fixed communication devices, but also to transmit and receive voice signals between extension communication devices normally, thereby increasing the efficiency of use of the wireless telephone. .

Claims (2)

An antenna for transmitting and receiving a high frequency signal, a mixing unit for mixing the high frequency signal inputted from the antenna into the oscillation frequency of the first oscillation unit and converting it into an intermediate frequency, and a demodulation unit for demodulating the intermediate frequency of the mixing unit and outputting the audible signal. And a transmitter including a receiver, a modulator for carrying a user's voice signal at an oscillation frequency of a second oscillator, and a power amplifier for amplifying the modulated signal of the modulator and propagating the modulated signal to the outside through the antenna. In the extension call device of, And a oscillation frequency switching unit for inverting the oscillation frequencies of the first oscillator and the second oscillator, respectively, to switch the transmission frequency and the reception frequency so that voice signals can be transmitted and received between internal communication devices. Extension call device. The method of claim 1, And the oscillation frequency switching unit includes an inverter for inverting an oscillation frequency of the first oscillation unit and an oscillation frequency of the second oscillation unit, respectively.