KR940003840B1 - Cordless telephone system - Google Patents

Abstract

The device includes a transmit-receive buffer (10), a high frequency amplifier (20),a frequency mixer (30), a receiving voltage control oscillator(40), a PLL (50) which controls the voltage of oscillator, a frequency mixing and middle frequency amplifier (60), a voice amplifier (70), a data detection unit (80), a transmitted power amplifier (90), a transmitted voltage control oscillator (100), a FM modulator (110), a central processing unit (120), a calling circuit (130), a switching uint (140), a ringer unit (150), a ring signal detector (160), receiving and transmitting signal switching units (170,180), a signal contactor (190), and a breakdown detector (200).

Description

Wireless telephone call device and method thereof in case of power failure

1 is a block diagram of the fixing device of the present invention.

2 is a block diagram of a portable device of the present invention.

3 is a flow chart for explaining the call method of the present invention.

Figure 4a is an exemplary view showing the usual connection state in the device of the present invention.

Figure 4b is a diagram showing the use of the connection state when the power failure in the device of the present invention.

5 is a block diagram of a conventional fixing device.

6 is a block diagram of a conventional portable device.

* Explanation of symbols for main parts of the drawings

10, 10 ': transmitting and receiving buffer unit 20, 20': high frequency amplifier unit

30, 30 ': frequency mixing section 40, 40': receiving voltage control oscillation (VCO) section

50, 50 ': PLL section 60, 60': frequency mixing and intermediate frequency amplifier section

70, 70 ': negative amplifier 80, 80': data detector

90, 90 ': Transmission power amplification part 100, 100': Transmission voltage control oscillation (VCO) part

110, 110 ': FM modulator 120, 120': central processing unit (CPU)

130: call circuit 140: switching unit

150 ringer unit 160 ring signal detection unit

170, 170 ': reception signal switching unit 180, 180': transmission signal switching unit

190, 190 ': Signal connection part 200, 200': Power failure detection part

210: keyboard unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone calling device and method thereof in the event of a power failure, and more particularly, to a wireless telephone calling device and a method for joining an emergency call in case of sudden power failure.

In the conventional radiotelephone, the configuration of the fixing device includes a song received through an antenna ANT, a song for separating a received high frequency signal from each other, a reception buffer unit 310, and a received high frequency signal. A high frequency amplification unit 320 for amplifying a frequency, a frequency mixing unit 330 for detecting a first intermediate frequency by mixing a frequency generated from the reception voltage controlled oscillation (VCO) unit 340 with a reception frequency, and a prescribed frequency PLL unit (350) for monitoring the signal, an intermediate frequency amplification and mixing unit (360) for amplifying and mixing the first intermediate frequency to detect a voice signal and a data signal, and a voice amplifier (370) for amplifying the voice signal. And a data detector 380 for detecting data, a transmission amplifier 390 for amplifying the transmission output radiated to the antenna ANT, and a transmission for generating a required transmission frequency by frequency multiplying the FM-modulated signal. Voltage controlled oscillation (VCO) unit 400, voice and An FM modulator 410 for FM modulation of data signals, a central processing unit 420 for controlling the operation of each circuit unit as a whole, a call circuit unit 430 for connecting a transmission / reception voice signal with a trunk line, and a trunk line looping. A switching unit 440, a ringer unit 450 for reproducing a ringing tone, a PLL unit 450 for monitoring a fixed frequency, and a ring signal detection unit 460 for detecting a ring signal. As shown in FIG. 6, a song received through an antenna ANT, a song which separates a received high frequency signal from each other, a receive buffer unit 310, and a high frequency amplifier 320 amplifying the received high frequency signal; A frequency mixing unit 330 for detecting a first intermediate frequency by mixing a frequency generated from the reception voltage controlled oscillation (VCO) unit 340 and a reception frequency, a PLL unit 350 for monitoring a prescribed frequency; Amplifying and mixing the first intermediate frequency, the voice signal and the data Amplification of the intermediate frequency amplification and mixing unit 360 for detecting a call, a voice amplifier 370 for amplifying a voice signal, a data detector 380 for detecting data, and a transmission output radiated to an antenna ANT. A transmission amplification unit 390, a transmission voltage controlled oscillation (VCO) unit 400 for generating a required transmission frequency by frequency multiplying the FM modulated signal, and an FM modulator for FM modulating audio and data signals ( 410, and a central processing unit 420 for controlling the operation of each circuit unit as a whole.

However, such a conventional radiotelephone cannot be used during an outage because the call function only when power is supplied to the transmitter and the receiver, respectively. His use was very inconvenient.

Accordingly, an object of the present invention is to solve the above problems of the prior art, so that even if a power failure occurs when using a cordless phone, it is possible to perform the same function as a normal landline phone even when a separate landline phone is not connected in parallel. By doing so, it aims at convenience in use.

The present invention for achieving the object of the present invention is a radiotelephone which modulates and transmits a voice signal to a high frequency signal between a fixed device and a portable device, each of which is separately configured, and detects the voice signal on the received high frequency signal; A means for detecting a power failure state during a power outage, a means for connecting the fixed device and the portable device by wire during power failure, and a means for connecting the fixed device and the portable device by wire during power failure It comprises a means comprising a means.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a fixing device according to the present invention, which includes a high frequency transmission and a reception unit, and a reception buffer unit 10, a high frequency amplification unit 20 for amplifying a received high frequency signal, and a reception unit. A frequency mixing section 30 for separating the first intermediate frequency of 10.7 MHZ by mixing the oscillated frequency and the received frequency from the voltage controlled oscillator 40, and a receiving voltage controlled oscillator for oscillating a frequency higher than the receiving frequency by 10.7 MHZ. 40 and the PLL unit 50 for controlling the voltage of the voltage controlled oscillator by comparing the frequency oscillated by the received voltage controlled oscillator 40 and the reference frequency with each other, and 455 MHZ which is a second intermediate frequency at the first intermediate frequency. A frequency mixing and intermediate frequency amplification unit 60 for separating the voice signal and the data signal included in the second intermediate frequency, a voice amplifier 70 for amplifying the voice signal, and detecting and fixing the data signal. A data detection unit 80 for enabling data communication between the apparatus and the portable device, a transmission power amplifier 90 for amplifying a transmission high frequency signal, a transmission voltage control oscillator 100 for oscillating a transmission frequency, and a voice signal And an FM modulator 110 for frequency-modulating the data signal, a central processing unit 120 for overall control of the operation of each circuit unit, a call circuit unit 130 for signalingly connecting a wireless telephone circuit and a trunk line, and a trunk line. The switching unit 140 loops the loop, the ringer unit 150 for reproducing the ring signal applied to the trunk line, the ring signal detection unit 160 for detecting the ring signal applied to the trunk line, and the received signal at the time of power failure. Connected to be applied to the microphone of the reception signal switching unit 170 for connecting to the voice amplifier 70 when the power is applied, and transmits the transmission signal to the speaker (SP) of the portable device and the FM modulation unit ( Song connecting to 110) A new signal switching unit 180, a signal connection unit 190 for forming a communication path with the portable device in case of power failure, a power failure detecting unit 200 for detecting a power failure state, and a keyboard unit 21 for inputting a key signal. .

2 is a block diagram of a portable device according to the present invention, which includes a buffer unit 10 ', a high frequency amplifier 20' for amplifying a received high frequency signal, and a received voltage controlled oscillator 40 '. Frequency mixing unit 30 'for separating the first intermediate frequency of 10.7MHZ by mixing the oscillation frequency and the received frequency from, and the receiving voltage control oscillator 40' oscillating the frequency 10.7MHZ higher than the reception frequency And a PLL unit 50 'for controlling the voltage of the voltage controlled oscillator by comparing the oscillated frequency and the reference frequency with the received voltage controlled oscillator 40', and 455 KHZ which is a second intermediate frequency at the first intermediate frequency. A frequency mixing and intermediate frequency amplifier 60 'for separating and detecting the voice signal and the data signal included in the second intermediate frequency, a voice amplifier 70' for amplifying the voice signal, and detecting and fixing the data signal. Data communication between device and portable device A data detector 80 'for enabling a signal transmission, a transmission power amplifier 90' for amplifying a transmission high frequency signal, a transmission voltage control oscillator 100 'for oscillating a transmission frequency, and a voice signal and a data signal. FM modulation unit 110 'for modulating, a central processing unit 120' for overall control of the operation of each circuit unit, and a reception signal switching unit connected to the signal connection unit 190 'in case of power failure and switching to a call enabled state And a transmission signal switching unit 180 ', a signal connection unit 190' for forming a communication path with a fixing device in the case of power failure, and a power failure detection unit 200 'for detecting a power failure state.

In the method of the present invention related to such a device, as shown in FIG. 3, when a power failure occurs in a telephone call state, the transmission signal switching units 180 and 180 'of the reception signal switching units 170 and 170' are switched to an operational state, If it is not in the call mode, it detects whether it is in the dial mode, and if it is in the call mode, it maintains the call state and then determines whether it is in the call end state. Performing a process of detecting the dial mode, and returning to the call mode detection process if not in the dial mode, and operating the dial in the dial mode, and detecting whether the dial is terminated. Step 2 of returning to the detection process and returning to the dial operation state if it is not in the dialing end state. It is made up of.

Referring to Figures 1 to 4 the effect of the present invention made as described above are as follows.

First, the operation of the fixing device of the present invention shown in FIG. 1 will be described. The radio frequency (RF) signal transmitted from the portable device shown in FIG. 2 is input to the transmission / reception buffer unit 10 through the antenna ANT. The RF signal input in this manner is separated from the transmission / reception buffer unit 10 without mutual interference with the transmission frequency, and then amplified appropriately through the high frequency amplification unit 20 and applied to the frequency mixing unit 30 to receive the voltage control oscillator 40. The first intermediate frequency, which is mixed with the oscillation frequency at 10.7 MHZ, is detected.

The detected first intermediate frequency is mixed through the 10.240MHZ frequency oscillated by the PLL unit 50 and the frequency mixing and intermediate frequency amplification unit 60 to separate the second intermediate frequency of 455KHZ, and then the voice signal included in 455KHz. Will be detected.

The detected voice signal is transmitted to the trunk line via the reception signal switching unit 170 and the call circuit unit 130, which are properly amplified by the voice signal amplifier 70. That is, in a state where power is normally applied, the reception signal switching unit 170 maintains the state connected to the voice signal amplifier 70 under the control of the CPU 120. The control signal applied from the central processing unit 120 to the reception signal switching unit 170 is output according to the detection signal at the time of applying power or detected at the power failure detection unit 200.

Meanwhile, the signal applied through the trunk line is applied to the call circuit unit 130 via the switching unit 140, and the call circuit unit 130 transmits the input signal to the transmission signal switching unit 180. Since the transmission signal switching unit 180 is connected to the FM modulator 110 under the control of the visible central processing unit 120 which is a normal power source, the FM modulator 110 receives the signal supplied from the call circuit unit 130. Is applied. The signal input to the FM modulator 110 is modulated and amplified by the transmit voltage control oscillator 100 at high frequency through the transmit power amplifier 90 and then transmitted to the antenna ANT via the transmit / receive buffer unit 10. Radiated.

As described above, a series of operations are performed in a state where power is being supplied. In other words, when the power is applied, the power failure detection unit 200 detects whether the power is applied, and the central processing unit 120 according to the detection signal. At this time, the switching operation of the transmission signal switching unit 170 and the reception signal switching unit 180 is controlled. When the power is supplied, the switching is connected to a typical wireless telephone line.

The following describes the operation relationship during power failure. When the power outage, the circuit must be operated only by the small current flowing through the telephone line, the central processing unit 120 recognizes that the power failure state other than the circuit circuit 130, the switching unit 140 and the ringer 150 Intermediate supply of the circuit part is intermediated and the circuit is formed with only a small current. At this time, the power failure state recognition in the central processing unit 120 is to recognize the power failure state or the power supply state according to the detection signal applied from the power failure detection unit 200.

When the power failure state is recognized, a connection as in FIG. 4, which is an embodiment for enabling a telephone call using a portable device according to the present invention, is mechanically performed. As described in FIG. 4, when a power failure occurs, the fixed device and the portable device connected to the trunk line are connected by using a telephone line. When the connection is made, the signal connection unit 190 and the second device shown in FIG. The signal connector 190 ′ shown in FIG. 1 is connected to a telephone line.

When the fixed device and the portable device are connected as described above, the central processing unit 120 applies a control signal to the transmission signal switching unit 180 and the reception signal switching unit 170 when the power failure state is recognized. The switching unit 180 and the received signal switching unit 170 are connected to the signal connection unit 190.

In the state in which the call circuit is connected, the call signal through the trunk line is reproduced by the ringer unit 150 as a ring tone, and the central processing unit 120 loops the switching unit 140 so that the current flowing through the telephone line is centrally processed. A power passage is formed to be applied to the device 120 and the call circuit 130.

Meanwhile, the voice signal through the trunk line is transmitted to the switching unit 180 through the call circuit unit 130, and the signal applied to the switching unit 180 is connected to the signal connection unit 190 when the signal connection path is interrupted. The applied voice signal is transmitted to the signal connection unit 190. Since the signal connection unit 190 is connected to the signal connection unit 190 ′ of FIG. 2 depicting the portable device during power failure, the signal connection unit 190 is transmitted to the switching unit 170 ′ through the signal connection unit 190 ′ of FIG. The audio signal supplied to the unit 1705 is reproduced and output to the speaker SP.

The signal attracted through the microphone MIC of the portable apparatus shown in FIG. 2 is connected to the fixing apparatus shown in FIG. 1 through the switching unit 180 'and the signal connection unit 190' of FIG. It is supplied to the signal connection unit 190 of. The signal applied to the signal connection unit 190 of the fixing device shown in FIG. 1 is transmitted to the communication circuit unit 130 through the switching unit 170, and the signal supplied to the communication circuit unit 130 is amplified to provide a trunk line. Since it is sent out, you can make calls.

In the portable device shown in FIG. 2, the operation of each circuit portion given the same nomenclature is the same as the operation of each circuit portion of the fixing device, and thus description thereof is omitted.

In the method of the present invention related to the apparatus thus operated, as shown in FIG. 3, when the power failure occurs in the telephone call state, the CPU 120, 120 'receives the signal receiving switch 170, 170' and the signal transmitting switch 180, 180 '. ) Is connected to the signal connection unit (190, 190 ') to control the call is switched to the operating state, and then determine whether the call mode or not, whether the call mode or dial mode again, and maintain the call state if the call mode Then, it determines whether the call is terminated state and returns to the process of going to the standby state if the call is terminated state and maintaining the call state if the call is not terminated state.

If it is determined that the dial mode is not present, the call mode detection process is returned if it is not the dial mode, and if the dial mode is activated, it is detected whether the dialing is completed again. If it is not in the dialing status, it returns to the dialing status again.

FIG. 4 illustrates an embodiment in which the fixing device and the portable device are connected by using a power cord in the present invention as described above. As shown in FIG. When using a telephone, and in case of power failure, as in Figure 4b, by disconnecting the power cable from the adapter and connecting it to a portable device, it can perform the same function as a normal landline telephone. It is possible by line.

As described above, the present invention provides a similar function to a case where a conventional landline telephone is connected in parallel even during a power failure by using a three-wire connection between a fixed device and a portable device using a charging terminal. Since it can be performed, in the event of a power failure to eliminate the hassle of having to use a separate wired telephone in parallel separately, to facilitate the use, as well as to increase the user's desire to buy.

Claims (4)

Means for detecting a power failure state during a power failure in a radiotelephone in which a voice signal is modulated and transmitted to a high frequency signal between a fixed device and a portable device separately configured, and a voice signal is detected from the received high frequency signal; Means for connecting the fixed device and the portable device by wire during a power outage; and means for forming a call through the means by which the fixed device and the portable device are wired during a power failure. Call device. The method of claim 1; Wireless phone call device in the event of a power failure, characterized in that the three devices are connected between the fixed device and the portable device in the event of a power failure. The method of claim 1 or 2; Wireless telephone call device in the event of a power failure, characterized in that only the call to the fixed device. When a power failure occurs in the telephone call state, the reception signal switching unit 170 and the transmission signal switching unit 180 are switched to the operation state, and the operation mode is determined whether the communication mode is the telephone mode or the dial mode. Determining whether the call is in the end state after maintaining the call state, and if the call is in the end state, goes to the standby state and returns to the call state maintenance if the call is not in the end state; If it is not the dial mode, the process returns to the call mode detection process, and if the dial mode is activated, the dial is operated. The method of calling a wireless telephone in the event of a power failure, comprising the second step of returning to a dial operation state if it is not in the end state.

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