JP3528542B2 - Wireless repeater - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer communication modem and a wireless repeater for wirelessly transmitting signals such as FAX.

[0002]

2. Description of the Related Art In recent years, it has become possible to perform high-speed data communication with a personal computer modem, and it is possible to use a personal computer and a modem for fax transmission / reception without using a dedicated fax machine. Data communication using personal computers and modems has become popular.

In particular, a mobile phone is referred to as a notebook computer, and a card modem, a cable, and a PHS are used.
There is a method of performing personal computer communication and FAX transmission from anywhere within a wireless service area using a (simple mobile phone) or a mobile phone.

This system is shown in FIG. In the figure, 1 is a laptop computer, 2 is a PCI CMA type card modem,
Reference numeral 3 is a connection cable for connecting the card modem 2 to the PHS or the mobile phone 4 to the card modem 2.

In this system, the PHS and the mobile phone 4 are of a type having an analog input / output terminal, the card modem 2 can input and output analog in and analog out signals, and the connection cable 3 for connecting the PHS and the mobile phone 4 is supported. It is impossible unless it is a special one. In addition, call charges are higher than those of general public telephone networks
You have to pay with the S call charge system.

Here, in places such as indoors, offices, home gardens, and other places where household cordless telephones can be used, telephone lines are not laid around at a charge of a general public line network like household cordless telephones. There is a need for personal computer communication.

For example, there are many people who want to perform personal computer communication in a conference room of an office, a rented house where telephone construction is difficult, or a place where a desktop personal computer and a modular jack of a public telephone line network are far apart. Deaf, especially for stationary modems that are often used in desktop PCs, analog-in,
Since there are almost no models with analog out terminals, only the interface with the telephone line is available. In such a case, mobile computing using a PHS or a mobile phone cannot be performed, and therefore many people give up personal computer communication.

In view of this, a lot of devices have been disclosed that wirelessly relay a modem modulation signal of a personal computer to a modular jack insertion port of a public telephone line network.

For example, Japanese Unexamined Patent Publication No. 3-94551 discloses a system that enables this without connecting a special modem for mobile computing to which an analog input / output cable can be connected. . This system is shown in FIG.

In this system, when the personal computer 5 starts the communication software, the modem 6 goes off-hook. Then, a DC distribution current flows from the DC power supply 8 to the modem 6 through the modem connection terminal 7 on the slave unit side. This lowers the potential of the modem connection terminal 7, and the voltage detection circuit 9
Responds to this and turns on the transmitter 11 via the signal line 10.
Then, radio waves are transmitted from the antenna 12.

This radio wave is intercepted by the antenna 15 of the master unit, and the carrier detection signal that is output when the receiving unit 16 of the master unit detects a wireless carrier wave (for example, 400 MHz) to be transmitted in the air is output to drive the relay. When applied to the circuit 17, the line relay 18 is pulled, and the telephone line and the base unit are connected.

When the personal computer 5 terminates the communication, the modem 6 goes on-hook, and the DC distribution current from the DC power supply 8 disappears, so that the potential of the modem connection terminal 7 rises and the voltage detection circuit 9 sends a signal. Transmitter 11 via line 10
Is turned off and radio waves from the handset are no longer emitted.

Then, the receiving unit 16 of the base unit, for example, 4
Since the carrier wave of 00M cannot be detected, the carrier wave detection signal is turned off. As a result, the relay drive circuit 17 turns off the line relay 18, and the main unit and the telephone line are disconnected.

As described above, the on-hook and off-hook of the modem 6 are reproduced as the on-hook and off-hook of the line relay 18 of the master unit. From the first off-hook of the communication of the modem 6 to the on-hook of the end of the communication and the pulse dialing, the transmission radio waves from the slave unit of the receiver unit 16 of the master unit are reproduced.

Next, for dialing or data transmission by the DTMF sound of the modem 6, since the slave switching relay 14 in the slave is normally on the a side, the two-wire signal of the modem 6 is a slave. When it reaches the machine hybrid circuit 13, it is converted into two lines and four lines and decomposed into an input signal and an output signal of the modem 6, and the output signal of the modem 6 is sent to the transmitter section 11 of the slave unit, where (for example, 400 MHz). ) It is modulated and emitted from the slave antenna 12.

This radio wave is intercepted by the base unit antenna 15 and received by the base unit receiving unit 16. Here, when receiving the modulated carrier wave of the slave unit (for example, 400 MHz), Hi / Lo
At the same time that the binary carrier wave detection signal is output, the signal demodulated in the voice band is sent to the parent device hybrid circuit 19, where it is converted to 2-wire to 4-wire and then passed through the line relay 18 and the telephone jack 20. It is sent to the telephone line.

On the contrary, the signal from the telephone line reaches the parent device hybrid circuit 19 via the telephone line connection jack 20 and the line relay 18, and is divided into an input component and an output component. The signal from the telephone line is sent to the master transmission section 22 via the master switching relay 21 which is normally set to the side a, where it is wirelessly modulated and radiated into the air from the transmission antenna 15.

This radio wave is intercepted by the antenna 12 of the slave unit, demodulated by the receiver unit 23 of the slave unit, and hybridized by the hybrid circuit 13.
Is transmitted to the modem 6 through the modem connection terminal 7 through the slave switching relay 14 which is normally converted to the 2-4 line and is normally set to the a side.

Next, the bell signal from the telephone line (75 Vrm
s 20 Hz), when a bell signal is detected by the call signal detection circuit 24 of the parent device, a logical output of Hi / Lo2 value is given to the drive circuit 25 and the second call signal generation circuit 26. As a result, the drive circuit 25 becomes the master unit switching relay 21.
Is turned on to switch the contact from a side to b side. In addition, the second signal generation circuit 26 sends a second call signal of 4.0 kHz higher than the band used by the modem 6 in the range of 300 to 3.4 kHz instead of the signal from the telephone line, and the base station antenna 15 Is modulated with a second call signal of 4.0 kHz (eg at 400 MHz).

The slave unit receives this radio wave with the antenna 12 of the slave unit, demodulates it with the reception unit 23, and outputs the second call signal detection circuit 2
When 7 detects a signal of 4.0 kHz, it outputs Hi logic to the calling signal generation circuit 28 and the drive circuit 29.

As a result, the calling signal generating circuit 28 switches the slave switching relay 14 to the b side. Therefore,
At the moment when the base unit receives the bell signal, the modem 6 receives the bell signal generated by the call signal generation circuit 28.

As described above, JP-A-3-94551
The system described in the publication does not relay the modem between the modem and the telephone line jack by a cord, but relays by radio. As a result, the degree of freedom in installing the personal computer 5 and the modem 6 is significantly improved.

Here, when the bell signal is generated on the slave side, the calling signal generating circuit 28 must generate a signal corresponding to the bell on the telephone line. This is performed by the call signal generation circuit 28 of FIG. The bell on the telephone line is 75 Vrms, 20 Hz as in Figure 4a.

The Peak to Peak of this is 2√2
Since it is Vrms, it is 2√2 × 75 = 211V.
In order to realize this with a clean SIN wave, a high-voltage transistor or a high-power amplifier is required, and since heat generation becomes large, a square wave of 210 V may be generated rather than the SIN wave as shown in FIG. 4b. It is realistic. In addition, the child machine usually operates with a secondary battery,
Most of them operate on three cells of NiCd battery 1.25V × 3 = 3.75V.

Therefore, since it is difficult to make 210V at a stretch from 3.75V, it is usually the two-stage DC-D of FIG.
C converter configuration or D in Fig. 6
There is a method of raising the voltage once with a C-DC converter and then using a step-up transformer.

First, the DC-DC converter of FIG.
Although it is a method of using individually, the potential of 3.75V of the 3-cell NiCd battery 30 is boosted to 20V by the DC-DC converter 31 in the first stage. Reference numeral 32 denotes a 25V withstand voltage capacitor, which is provided to withstand a sudden load change by the DC-DC converter 33 in the next stage. The DC-DC converter 33 at the next stage boosts 20V to 210V and accumulates charges in the capacitor 34 having a withstand voltage of 250V. Three
Reference numeral 9 is a 20 Hz oscillator, which is ANDed with a square wave shaped by the Schmitt trigger buffer 38.
It is distributed to the circuit 37.

The second call signal detection signal is the AND circuit 3
When applied to the other input terminal 40 of 7, the drive transistor 36 turns ON / OFF at 20 Hz, and the relay 35 also turns ON / OFF accordingly. As a result, a bell-shaped bell signal of 210 V is output to the bell output terminal 341 as shown in FIG. 4B.

Next, a method of using the step-up transformer of FIG. 6 will be described. The potential of the 3-cell NiCd battery 30 is 3.75V, but the DC-DC converter 42
Boosts to 20V. This boosted voltage is connected to a booster transformer 46 via a relay 44 by connecting a capacitor 43 having a withstand voltage of 25 V to reduce the influence of load fluctuation. Since the step-up transformer 46 is an inductive load for the relay 44, a surge absorbing capacitor 45 is connected as a measure against contact surge. 20 as in the previous method
The output waveform of the oscillator 51 of Hz is the Schmitt buffer 5
It is converted into a square wave at 0 and given to the AND circuit 49. When the input terminal 52 for detecting the second call signal becomes Hi, the AND circuit 49 turns ON / OFF at 20 Hz, and the drive transistor 48 and the relay 44 also turn ON / OF.
20V, 20V to the primary side of the step-up transformer 46
When a voltage of Hz is applied, a square wave of 210 V appears at the bell output terminal 47 as shown in FIG. 4b.

[0029]

The ringing signal generation circuit 28 of FIG. 3 for generating a bell in the above-mentioned slave unit has a square-wave bell signal as shown in FIG. 4b for heat generation of parts and space saving. Is output, the circuit system of FIG. 5 or 6 is required.

In the configuration of FIG. 5, two DC-DC converters are required, and in order to generate a high voltage of 210V for the second stage, the parts used, for example 250V.
The withstand voltage condenser 34 must also have high withstand voltage, and the shape of the parts becomes large.

The step-up transformer system shown in FIG. 6 is also 20 Hz.
Since the low frequency is used, the energy transfer efficiency per unit volume of the core is poor, and therefore a large shape must be used, which increases its weight and space.

On the other hand, the use of giving a bell signal to the modem 6 to automatically receive the modem 6 is as follows.
There are few because the user is on the client side. It is extremely rare for a general user to open a host station, and even if there is any, a plurality of telephone lines are drawn to connect a plurality of modems, and therefore it is unthinkable to wirelessly relay from a telephone jack to a modem.

FIG. 3 shows a case where it can be used as an automatic incoming call.
This is the case where the fax software is always running on the personal computer 5 and automatic incoming call is set, or a dedicated fax machine is installed in place of the personal computer 5 and the modem 6.

As described above, in the conventional wireless repeater composed of the slave unit and the master unit, when the bell is applied to the master unit from the telephone line, the booster transformer or the high voltage generating circuit is used to generate the bell signal in the slave unit. Was necessary, which led to an increase in the size of the child device and an increase in cost. On the other hand, the automatic call reception by the bell is practically used only when the FAX operation or the FAX dedicated machine is connected.

In consideration of the above-mentioned conventional problems, the present invention provides a compact and inexpensive slave unit of a wireless repeater capable of automatically receiving a modem or a fax machine having a ringing incoming call function of G3 standard. The purpose is to make it possible.

[0036]

[Means for solving the problem] Even if the bell signal of 75V, 20Hz is not actually applied by the G3 standard FAX dedicated machine in Japan, the 1300Hz signal is detected on the telephone line. Then, there are many products that have the function of automatically receiving an incoming call. There is also a data communication modem having a "1300 Hz silent ringing function" (for example, SFA-288 from Megasoft).

Of these, the slave unit is 75 V, 20 Hz
If a 1300 Hz signal is transmitted to the modem connection terminal instead of generating the bell signal, the automatic incoming call becomes possible when the above-mentioned FAX dedicated machine and modem are connected.

For the wireless repeater, the 1300 Hz generation circuit can be constructed with extremely few parts as compared with the 75 V, 20 Hz bell generation circuit. Can be solved.

From these things, the present invention is connected to a slave unit having a wireless communication unit for transmitting and receiving and an input / output unit for an external communication unit, a wireless communication unit for communicating with the slave unit and a telephone line. A wireless relay device comprising a master unit having a means, wherein when the master unit receives a bell signal, the slave unit transmits a start signal to an external communication device.

According to the present invention, it is possible to automatically receive an incoming call from a modem or a fax machine having a silent ringing function, and it is possible to realize a compact and inexpensive slave unit of a wireless repeater.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a wireless communication means for transmitting and receiving and an input / output means for an external communication device, and a processor for outputting a signal of 1300 Hz.
And a wireless communication means for communicating with the slave, a means for connecting to a telephone line, and a coordinator for the slave.
Made from the base unit and a processor having a function of sending out the command, when receiving a ringing signal in the base unit, the parent
The machine sends a command to the child machine, which means Bell Start.
Ri, slave having received the command to the external communication device 13
It is a wireless repeater that transmits a signal of 00 Hz , and has an effect that the slave unit can be made compact and inexpensive.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a circuit diagram of a wireless repeater according to Embodiment 1 of the present invention. The same reference numerals are given to the same components as those in FIG. 3 described above, and the configuration is simplified by using the slave unit microprocessor 54 and the master unit microprocessor 53.

First of all, the voltage detection circuit 9 is a voltage dividing resistance 55, 56 and a Schmitt trigger buffer 57.
And the inverter 58 is configured.

Here, when the modem 6 goes off-hook, the voltage of the voltage dividing resistors 55 and 56 drops, the Schmitt trigger buffer 57 outputs Hi → Lo, and the inverter 58 becomes L.
o → Hi, and the modem / off-hook detection port is Hi
It is supposed to become.

The slave hybrid circuit 13 comprises a sending operational amplifier 59 and an input operational amplifier 60. Reference numeral 61 is a high-cut filter that attenuates from 1300 Hz. It is provided to convert the 1300 Hz square wave output from the 1300 Hz oscillation port 64 into a 1300 Hz SIN wave. 63 is a sending adder, which is the receiving unit 23
Input and the 1300 Hz oscillation port 64 and the 1300 Hz wave output by the high cut filter 61. Reference numeral 66 denotes a reception adder for transmitting the output of the input operational amplifier 60 which sends the input signal from the modem 6 and the microprocessor 54 for the slave unit to the microprocessor 53 for the master unit to send a command to the microprocessor 53 for frequency modulation (FSK). The outputs of the child device FSK output ports 65 are summed up and sent to the transmitter 11. Further, the command sent from the master device microprocessor 53 to the slave device microprocessor 54 is received by the receiving unit 23, and then the FSK command is received.
The waveform is shaped by the reception Schmitt trigger buffer 67 and input to the handset FSK input port 68.

In the master unit, the calling signal detection circuit 24 is composed of a resistor 69, a high withstand voltage capacitor 70, 150V.
It is composed of Zener diodes 71 and 72, a bidirectional photocoupler 73, and a secondary side resistance. DC 150V
When the line signal exceeds, the current flows to the primary side of the bidirectional photocoupler 73, and Hi input is applied to the bell input port 74 of the master microprocessor 53. This circuit responds only to the bell signal. The parent hybrid circuit 19 is composed of a call transformer 75, a circuit sending amplifier 76, and a line input amplifier 77, and 2-line to 4-line conversion with a telephone line is performed here.

Reference numeral 78 denotes an input adder, which outputs the input signal from the telephone line and outputs from the line input operational amplifier 77 and the master unit F of the master unit microprocessor 53.
The FSK output from the SK output port 79 is combined and sent to the transmitter 22. As a result, the master unit can wirelessly transmit both the voice band signal from the telephone line and the FSK information, which is communication between the microprocessors, to the slave unit. Child device microprocessor 5 from the opposite child device
The command from 4 is demodulated by the reception unit 16 of the master unit, and F
The waveform is shaped by the SK reception Schmitt trigger buffer 80 and received by the master FSK input port 81. Reference numeral 82 denotes an off-hook control port, which is set to Hi to turn on the drive transistor 83 and activate the line relay 18, thereby connecting the base unit and the telephone line.

Communication between the master unit and the slave unit is 1 to 1.5 kHz,
0 at 900 Hz Frequency modulation method (Frequecy Shi
ft Keying), the amplitude level of this FSK data is much larger than that of the signal of the modem 6 and the line, and it is possible to identify even if the signal of the line or the like is superposed.

When there is no need for communication, both the child device and the parent device are F
Since the SK data output port is normally Lo, the receiver adder 66 of the slave unit and the input adder 78 of the master unit respectively transmit only the output signal of the modem and the input signal from the line. In addition, the microprocessor 5 for the child device
4, the microprocessor 53 for the base unit is always the handset FS
The K input port 68 and the master FSK input port 81 are monitored, and it is checked whether or not an FSK command has arrived. If so, the command is immediately processed. Commands from the handset to the base unit include disconnection from the "on-hook"'1000' telephone line and connection with the "off-hook"'1001' telephone line, and commands from the base unit to the handset include "bell start". '110
There is a start of receiving the bell signal from the 0'line, and a stop of receiving the bell signal from the "bell stop"'1101' line.

The operation will be described below in accordance with the actual movement with reference to FIG. When activating communication software from the personal computer 5 to call a BBS (host station for personal computer communications) or a provider, first, the modem 6 goes off-hook.

Then, the potential of the modem connection terminal 7 drops due to the current supplied from the DC power supply 8. Then, in accordance therewith, the input level of the Schmitt trigger buffer 57 obtained by the voltage dividing resistors 55 and 56 also drops, and this logic changes from Hi to Lo. Along with this, the output of the inverter 58 changes from Lo to Hi, and a Hi input is added to the modem off-hook detection port 62.

In response to this, the microprocessor 54 for the handset sets the handset transmitter drive port 84 to Hi to activate the transmitter 11 of the handset to start radio wave transmission. And handset F
At the SK output port 65, the frequency modulation (FSK) data in which 1 is 1.5 kHz and 0 is 900 Hz is '10.
01 '"Off-hook" is sent, requesting the base unit to connect to the line.

The master unit receives the FSK data at the reception unit 16 of the master unit, and receives the FSK reception Schmitt trigger buffer 8
The waveform is shaped by 0, and the master FSK input port 81 of the master microprocessor 53 receives this. The master unit microprocessor 53 decodes this as '1001'"off-hook", sets the master unit transmitter drive port 85 to Hi to operate the transmitter 22, and drives the off-hook / control port 82 to Hi. The transistor 83 is turned on and the line relay 18 is closed to connect the base unit and the telephone line.

Thereafter, the child device microprocessor 54 and the parent device microprocessor 53 monitor at the FSK input port whether or not a command is sent.

Next, consider the case where the user terminates the communication software on the personal computer 5. Since the modem 6 goes on-hook, the potential of the modem connection terminal 7 rises and the output of the voltage detection circuit 9 becomes Lo. When the slave microprocessor 54 receives this, the slave unit FS issues a '1000'"on-hook" command at 1 for 1.5 kHz and 0 for 900 Hz.
It is sent from the K output port 65. Then, the FSK data is superimposed on the signal of the input operational amplifier 60 by the reception adder 66, and is transmitted through the transmitter 11 of the slave and the antenna 12 of the slave.

The base unit is the antenna 15, the receiving unit 16 and the FSK.
After receiving the FSK command via the Schmitt trigger buffer 80, the off-hook control port and the line relay 18 are turned off to disconnect the telephone line from the base unit. Then, the master unit transmitter driving port 85 is turned off to turn on the transmitter 22.
Disconnect. Similarly, the slave unit also sets the slave unit transmitter drive port 84 to Lo after sending the on-hook command, and stops the transmitter unit 11 of the slave unit.

The above is the operation when the line is accessed from the slave unit side. Next, the case where the bell signal is received from the telephone line will be described.

75 when the bell signal comes from the telephone line
SIN wave of V, 20Hz is sent, so 2√2 ×
The voltage of 75 = 211V is the telephone line connection jack 2 of the base unit.
150V Zener diode 71 to add 0,
A current flows through the bidirectional photocoupler 73, exceeding the conduction voltage of 72. As a result, the output of the call signal detection circuit 24 generates a Hi pulse group and is input to the bell input port 74 of the master microprocessor 53. The microprocessor 53 for the master unit sets "1" to 1.5 kHz, "
Bell start with FSK data where 0'is 900 Hz '
1100 ′ is output to the FSK output port 79, is modulated by the transmission unit 22 via the input adder 78, and is transmitted by radio waves from the base unit antenna 15.

This radio wave is received by the antenna 12 of the handset unit, demodulated by the receiving unit 23, shaped by the Schmitt trigger buffer 80 for FSK reception, and added to the handset FSK input port of the handset microprocessor 54. .

When the microprocessor 54 for the slave unit deciphers this as "Bell Start"'1101', it considers that a Bell signal is applied to the master unit and outputs a square wave of 1300 Hz from the 1300 Hz oscillation port. This is 1300Hz after the harmonics are removed by the high cut filter 61.
Of the SIN wave, and the transmission adder 63 and the transmission operational amplifier 5
After passing 9, the modem 6 is given 1300 Hz. If the modem 6 supports the G3 standard 1300Hz silent ringing function, the modem 6 uses a telephone line of 75V, 20H.
As with the reception of the bell signal of z, the ASCII data "RING" is sent to the personal computer 5 to notify the running communication software that it is in the ringing state, and at the same time, it is set by this communication software. If the number of "RING" transmissions matches the number of Bell automatic incoming calls, the modem 6
Automatically receives the call.

In place of the modem 6 and the personal computer 5, F
Even if a dedicated AX machine is connected to the modem connection terminal 7, FA
When X receives the signal of 1300 Hz, it automatically receives the call.

As described above, in the wireless repeater according to the first embodiment, when the bell signal is added to the parent device, the G3 is transmitted from the child device.
Automatic incoming call can be realized by applying 1300Hz to the standard non-ringing function modem or fax machine.
The bell signal generator of the slave unit is not required, and a cheap and compact slave unit can be realized.

[0063]

As is apparent from the above description, in a wireless repeater composed of a slave unit and a master unit, a bell signal is generated by the slave unit when a bell is applied to the master unit from a telephone line. Requires a step-up transformer or a high-voltage generation circuit, which leads to an increase in the size of the child device and an increase in cost. On the other hand, on the other hand, the automatic call reception by the bell is practically used only when the FAX operation or the FAX dedicated machine is connected.

On the other hand, the wireless repeater of the present invention operates as a slave unit 1300 when the master unit receives a bell signal from the telephone line.
By transmitting the Hz, it is possible to automatically receive a modem or a FAX-dedicated machine having a G3 standard silent ringing function, and it is possible to realize a compact and inexpensive slave unit.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a wireless repeater according to a first embodiment of the present invention.

[Figure 2] Connection configuration diagram of a personal computer used for mobile computing, a modem card, and a mobile phone

FIG. 3 is a circuit diagram of a conventional wireless repeater.

FIG. 4A is a bell signal waveform diagram of a telephone line, and FIG. 4B is a bell signal waveform diagram which the call signal generation circuit is trying to make.

FIG. 5 is a circuit diagram of a calling signal generation circuit using two DC-DC converters.

FIG. 6 is a calling signal generation circuit K using a step-up transformer.
circuit diagram

[Explanation of symbols]

5 PC 6 modem 7 Modem connection terminal 8 DC power supply 9 Voltage detection circuit 11 Transmitter of handset 12 Handset antenna 13 Remote unit hybrid circuit 15 Base unit antenna 16 Receiver of base unit 18 circuit relay 19 Base unit hybrid circuit 20 telephone line connection jack 22 Base unit transmitter 23 Receiver unit 24 Call signal detection circuit 53 Microprocessor for base unit 54 Microprocessor for handset 55 partial pressure resistance 56 partial pressure resistance 57 Schmidt trigger buffer 58 inverter 59 Sending operational amplifier 60-input operational amplifier 61 high cut filter 62 modem off-hook detection port 63 Sending adder 64 1300Hz oscillation port 65 Remote unit FSK output port 66 Receive adder 67 Schmitt trigger buffer for FSK reception 68 Remote unit FSK input port 69 resistance 70 high voltage condenser 71 150V Zener diode 72 150V Zener diode 73 Bidirectional photo coupler 74 bell input port 75 call transformer 76 line sending amplifier 77 line input amplifier 78-input adder 79 Base unit FSK output port 80 FSK reception Schmitt trigger buffer 81 Base unit FSK input port 82 Off-hook control port 83 Drive transistor 84 Remote unit transmitter drive port 85 Base unit transmitter drive port

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (2)

(57) [Claims] 1. A wireless communication means for transmitting and receiving and an input / output means for inputting / outputting with an external communication device and outputting a signal of 1300 Hz.
A slave unit having a processor , a wireless communication unit for communicating with the slave unit , a unit for connecting to a telephone line, and a function for sending a command to the slave unit.
Made from the base unit and a processor having a receives the bell signal at the base unit, said base unit slave machine
To send a command that means bell start, slave having received the command 1300 to the external communication device
A radio repeater characterized by transmitting a Hz signal . 2. A slave unit and a master unit, wherein the slave unit includes a wireless communication means for transmitting and receiving, and a sending pair.
Handset hybrid circuit with pump and input operational amplifier
And an oscillation port that outputs a 1300Hz square wave
From the microprocessor for the child device and the wireless communication means
Input and the oscillation port of the microprocessor for the slave unit
Output from the high-cut filter to remove harmonics
And a transmission adder for summing the wave of 1300 Hz, the master unit is a wireless communication unit that communicates with the slave unit,
Ring signal detection circuit for detecting bell signal and circuit transmission
2-line to 4-line transformation between an amplifier or line input amplifier and a telephone line
The master unit hybrid circuit for switching and the frame for the slave unit
Master processor with a function to send a command
, The input signal from the telephone line and the micro
An input that synthesizes a command from the output port of the essa
Equipped with an adder and detects the call signal of the base unit when a bell signal comes from the telephone line
The circuit detects this and sends it to the master microprocessor.
By the way, the microprocessor for the base unit means Bell Start
Command to output the input adder
Sent to the transmitter via the transmitter, and the transmitter modulates the command and sends it as a radio wave.
Then, the receiving unit of the slave unit that received this radio wave demodulates the command.
In addition to the microprocessor for the slave unit, the microprocessor for the slave unit sends a bell message to the master unit accordingly.
1300H from the oscillation port assuming that the signal is added
Outputs a square wave of z, and the high-cut filter removes harmonics
Send the 1300Hz signal to the external communication device
A wireless repeater characterized by that .