KR930002793Y1 - Device for receiving and transmitting signal - Google Patents

Abstract

No content.

Description

Transceiver

1, 2, 5 to 9 are views for explaining the present invention.

3 and 4 are schematic diagrams of an example of the present invention.

* Explanation of symbols for main parts of the drawings

1: Handset (Accessory) 2: Base Unit (Main Machine)

110,210: transmitting circuit 120,220: receiving circuit

140,240: microcomputer (control unit)

The present invention relates to a transceiver such as a wireless telephone.

In a typical telephone, the telephone cord is connected to a rosette attached to a pillar or a wall. Therefore, the range in which the telephone can be moved is determined by the length of the telephone cord, which is several meters long. However, lengthening the phone cord to broaden its range of movement can lead to tangled or disturbing cords.

Thus, in the United States, a telephone system called a wireless telephone is being considered.

It is constituted by a transceiver 1 called an attached machine, a handset, and a transceiver 2 called a periodic system, a base unit, as shown in FIG. 1, and a telephone line 3 is connected to the base unit 2. At the same time, the base unit 2 and the handset 1 are coupled together by radio waves, so that the call of the subscriber is made to the handset 1 in the same manner as a normal telephone.

Thus, the subscriber can freely move the handset 1 when calling, and there is no tangled or disturbed telephone cord.

The distance (service area) from which the handset 1 can be separated from the base unit 2 is about 300 m. In addition, the frequency of radio waves used between the handset 1 and the base unit 2 is 49 MHz in the rising channel, 46 MHz in the falling channel, and 10 duplex channels are recognized by the FCC. ).

In this way, according to this wireless telephone, the telephone can be used conveniently.

However, in such a radiotelephone, for example, as shown in FIG. 2, two handsets 1A and 1B may be used in combination with one base unit 2. However, even in such a case, the transmission from the base unit 2 uses a common falling channel (carrier frequency fd) for both handsets 1A and 1B, and at the same time the reception of the base unit 2 is received. In both handsets 1A and 1B, a common rising channel (carrier frequency fu) is used.

Therefore, when the base unit 2 calls the handsets 1A and 1B due to an external telephone call, both handsets 1A and 1B ring only, so there is no problem. However, if both handsets 1A and 1B respond to the call, both sides transmit on the same rising channel (frequency fu), which causes problems such as interference. In the worst case, the base unit 2 cannot receive signals from any of the handsets 1A and 1B, causing a problem that the base unit 2 cannot respond even when the bell is ringing.

In addition, even when making a telephone call to an outside line, if the handsets 1A and 1B are used at the same time, problems such as interference or distress occur for the same reason.

The present invention is intended to solve this problem.

To this end, in the present invention, for example, a code signal CODE of a format as shown in FIG. 5 is formed, and this signal CODE is shown as a handset 1A using, for example, a protocol as shown in FIG. ), (1B) and the base unit (2) to access to form a communication channel.

That is, the code signal CODE has a length of one word as one unit, and has an 8-bit identification code ID, a 2-bit individual code HAND, and 6-bit control data DATA as shown in FIG. The identification code ID is for identifying one set of the handsets 1A, 1B and the base unit 2 and another set, and the handsets 1A, 1B and the base unit 2 of one set. It is a common value for), but a different value for other pairs. In addition, the individual code HAND is for identifying or selecting the handsets 1A and 1B, for example, "00": codes common to the handsets 1A and 1B, and "01": handsets. Unique code of (1A), “10”: Unique code of handset 1B. In addition, the control data DATA becomes a control signal when a control signal is accessed between the handsets 1A and 1B and the base unit 2.

When a communication channel is formed between the handset 1A or 1B and the base unit 2, the code signal CODE is first transmitted and received.

In this case, however, when the base unit 2 transmits the code signal CODE, the code signal CODE is repeatedly transmitted successively for each word as shown in Fig. 6A as necessary, but the handset 1A transmits the code signal. When the CODE is transmitted, as shown in Fig. 6B, the code signal CODE is transmitted three times in succession (three words), and then the operation of stopping two times of transmission (radio wave transmission) is repeated, and the handset 1B is performed. When the code signal CODE is transmitted, as shown in Fig. 6C, the operation of transmitting the code signal CODE twice in succession and then stopping the two-line transmission is repeated.

If the base unit 2 can receive either code signal CODE, the base unit 2 retransmits the individual code HAND included in the code signal CODE to the handsets 1A and 1B. (1B) stops the transmission when the retransmitted individual code HAND is not its own individual code, and continues the transmission when it is its own individual code to form a communication channel.

Next, embodiments of the present invention will be described with reference to the drawings. In the following description, when the handset 1A and 1B need not be distinguished, the handset 1 will be described. In addition, the communication channel between the handset 1 and the base unit 2 is made into two channels of A channel or B channel.

3 shows an example of a handset 1 which is an attached machine, where 110 is a transmitting circuit 120 is a receiving circuit. 4 shows an example of the base unit 2 as a periodic system, where 210 is a transmitting circuit and 220 is a receiving circuit.

At the time of the talk, the voice signal St from the talker 111 is supplied to the FM modulation circuit 113 through the low frequency amplifier 112 in the handset 1 and converted into the FM signal Su of the rising A channel or B channel. The FM signal Su is supplied to the antenna 100 through the high frequency power amplifier 114 and the band pass filter 115 having both rising channels as pass bands, and transmitted to the base unit 2.

In the base unit 2, a signal (radio wave) Su from the handset 1 is received by the antenna 200, and the band pass filter 221 whose reception signal Su is a pass band of both rising channels. And a high frequency amplifier 222 are supplied to the mixer circuit 223 while a local oscillation signal of a predetermined frequency is supplied from the local oscillation circuit 224 to the mixer circuit 223 so that the signal Su is converted into an intermediate frequency signal. The intermediate frequency signal is supplied to the FM demodulation circuit 226 through the spatial frequency amplifier 225 to demodulate the audio signal St. The signal St is a low frequency amplifier 227 → a hybrid circuit 231 → a relay circuit. The signal is sent to the telephone line 3 via the signal line 232.

In this case, the relay circuit 232 is a relay for turning on and off the connection between the base unit 2 and the telephone line 3, and when the call is suspended after the base unit 2 and the line 3 are in contact. And a hole drill to hold the line 3.

At the time of sign language, the audio signal Sr from the telephone line 3 is supplied to the handset 128 of the handset 1 by the same processing as that at the time of talk. That is, the audio signal Sr from the circuit line 3 is supplied to the FM modulation circuit 213 through the signal lines of the relay circuit 232-> hybrid circuit 231-> low frequency amplifier 212, so that the same channel as the FM signal Su Is converted to the FM signal Sd of the falling channel of which is supplied to the antenna 200 through the high-frequency power amplifier 214 and the bandpass filter 215 having the falling channels of both sides as the pass band, thereby providing a handset (1). Is sent).

In the handset 1, the signal Sd from the base unit 2 is received by the antenna 100, and the received signal Sd is a band pass filter 121 having both of the falling channels as a pass band and a high frequency. It is supplied to the mixer circuit 123 through the amplifier 122, and is supplied from the local oscillation circuit 124 to the local oscillation circuit and the mixer circuit 123 of a predetermined frequency so that the signal Sd becomes an intermediate frequency signal. The frequency signal is supplied to the FM demodulation circuit 126 through the intermediate frequency amplifier 125 to demodulate the voice signal Sr, and the signal Sr is supplied to the receiver 128 through the low frequency amplifier 127.

Also, in the handset 1, 140 denotes a control unit, i. The control circuit 140 is constituted by a one-chip type microcomputer, where 141 is a 4-bit parallel processing CPU, 142 is a program in which a program is written, and 143 is a work. The RAM for the area 144 is an input / output port.

A dial key 151, a torque switch 152, a channel switch 154, and a dip switch 155, 156 are connected to the controller, that is, the microcomputer 140.

In this case, the dial key 151 is a non-lock type push switch for inputting the other party's telephone number, the torque switch 152 is a three-position changeover switch for selecting an operation mode of the handset 1, When the switch 152 is in contact 0, the power of other circuits except the microcomputer 140 is turned off (off mode), and in the contact S, the signal Sd from the base unit 2 is in the standby standby state (standby mode). When the contact point T is in contact with the handset 1 and the base unit 2 (torque mode), it is normally connected to the standby contact S.

The channel switch 154 is a switching switch for changing the communication channel between the handset 1 and the base unit 2 to the A channel or the B channel. In addition, the switch 155 is for assigning an identification code ID, the switch 156 is for assigning an individual code HAND, and in the handset 1A, "01" is obtained as the code HAND in the switch 156. In the handset 1B, “10” is obtained as the code HAND in the switch 156.

The keys and the outputs of the switches 151 to 156 are supplied to the microcomputer 140.

Reference numeral 161 denotes an MSK modulation circuit which is a separate code transmitter, which converts the signal CODE from a binary signal to an MSK signal Sm of an audio band when the code signal CODE is supplied from the microcomputer 140. Sm is supplied to the amplifier 112.

Reference numeral 162 denotes a reception detection circuit, which is connected to the demodulation circuit 126 to use different ones of the frequency components of the output of the demodulation circuit 126 depending on the presence or absence of the signal Sd from the base unit 2. The presence or absence of the signal Sd is detected, and the detection signal RDET is supplied to the microcomputer 140.

Reference numeral 163 denotes an MSK demodulation circuit serving as an individual code receiver, which is connected to the demodulation circuit 126 to demodulate the original code signal CODE from the MSK signal Sm sent from the base unit 2, and The demodulated signal CODE is supplied to the microcomputer 140.

Reference numeral 146 denotes a call tone forming circuit, which is controlled by the microcomputer 140 to form a ring tone signal (ring tone signal) when the telephone is called, and the ring tone signal is supplied to the amplifier 127.

In addition, 166 indicates an LED, which is connected to the microcomputer 140 and lights when one of the handsets 1A and 1B tries to make a call, while the other is already using the call channel. It is a visual lamp.

In addition, from the microcomputer 140, the signal CH specifying the channel is supplied to the modulation circuit 113 and the local oscillation circuit 124, and the signal TX for controlling the transmission of the FM signal Su is modulated. Supplied to.

In addition, the muting signal MUTE is supplied from the microcomputer 140 to the amplifier 127.

In the base unit 2, reference numeral 240 denotes a control session.

The control circuit 240 is configured in the same way as the control circuit 140 of the handset 1 and has the same function. The control circuit 240 includes 100 circuits corresponding to the circuits 141 to 144 of the control circuit 140. In place of the sign of the symbol No. 200, the description thereof is omitted.

In addition, the switches 254 and 255 and the circuits 261 to 264 are the same as the switches 154 and 155 and the circuits 161 to 164 of the handset 1, respectively. Since it is the same also about these, these description is abbreviate | omitted. However, the forming circuit 264 forms a tone encoder signal TE corresponding to the telephone number when making a call to the other party.

Reference numeral 265 denotes a ring tone signal detection circuit, which is connected to the telephone line 3 to detect a ring tone signal when a call is made, and the detection signal BL is supplied to the microcomputer 240. In addition, a control signal line is provided between the relay circuit 232 and the microcomputer 240.

When a telephone call is received from the outside line, the following operations are performed by the microcomputers 140 and 240 according to the programs of the ROMs 142 and 242.

That is, when a telephone call is made from an external line at an arbitrary time t ₁ , the detection circuit 265 sends a ring tone signal BL to the microcomputer 240, and based on this, the FM of the modulation circuit 213 is transmitted by the signal TX. At the same time as the transmission of the signal Sd is allowed, a code signal CODE is formed in the microcomputer 240, and this signal CODE is converted into the signal Sm by the modulation circuit 261 which is a separate code transmission / reception unit, and then through the amplifier 212. It is transmitted by the signal Sd.

In this case, the identification code ID in the transmitted signal CODE is taken out from the switch 255, and the individual code HAND designates both handsets 1A and 1B, so the value is "00" and the data DATA is not received. The code indicates that it was. As shown in Fig. 7A, the signal CODE is repeatedly transmitted continuously one word at a time t ₁ . In Fig. 7 (and Fig. 8 and subsequent drawings), "00", "01", and "10" in the signal code CODE indicate the value of the code HAND being transmitted.

In the handset 1, normally, the torque switch 152 is connected to the standby contact S. FIG. When the signal Sd is received, the detection circuit 162 obtains the detection signal ROET of the signal Sd, so that the microcomputer 140 enters the check state of the identification code ID in the subsequent code signal CODE. When the signal Sm is taken out from the demodulation circuit 126 and the code signal CODE of the first one word is taken out from the demodulation circuit 163, the identification code ID in this signal CODE is set in the switch 155. If the code ID is matched, it is checked. If it does not match (from the other subscriber's base unit 2), further processing is not performed and the standby state is continued, but when it is matched, the individual code HAND is checked. In this case, HAND = "00", and since this designates both of the handsets 1A and 1B, the ringing signal is formed in both forming circuits 164, and this signal is used as the amplifier 127. It is supplied to the speaker 128 through.

Thus, in both the first 7b the code signals the handset at the time t ₂ after a first word of the CODE (1A), (1B) at the time t ₁ as shown in informs that the ring (ringer) ring, a call placed from the outside .

Therefore, in the following description, as shown in FIG. 7, the handsets 1B and 1A respond to the time points t ₃ and t ₄ respectively. That is, when the torque switch 152 is switched to the torque contact T in the handset 1B at the time point t ₃ , the transmission of the FM signal Su from the modulation circuit 113 is permitted by the signal TX based on the output thereof. At the same time, a code signal CODE is formed in the microcomputer 140, and this signal CODE is converted into a signal Sm and then transmitted by the signal Sd.

In this case, the identification code ID in the signal CODE transmitted from the handset 1B is taken out from the switch 155, and the individual code HAND is taken out from the switch 156 and at the same time a value to indicate that it is the handset 1B. Is "10", and the data DATA represents the response of the reception. As also described with reference to Fig. 6C, the transmission of the signal CODE from the handset 1B is repeated alternately between the transmission of two word periods at the time t ₃ and the transmission stop (stop of propagation) of the two word periods. Is done. That is, as shown in Fig. 7d, the signal CODE is repeatedly transmitted one word at a time t ₃ , but when the second signal CODE ends at the time t ₅ , the transmission of the signal Su is stopped by the signal TX. , At time t ₅ , the signal Su is allowed to be transmitted by TX again at time t ₇ after two word periods, and the signal CODE is transmitted.

On the other hand, when the torque switch 152 is switched to the torque contact T at the time point t ₄ in the handset 1A, the same processing as in the case of the handset 1B is performed and at time t ₄ as shown in FIG. The signal CODE is transmitted. However, the signal CODE from this handset 1A is " 01 " As also described in Fig. 6B, the transmission of the signal CODE from the handset 1A is performed by alternately repeating the transmission of three words from the time point t ₄ and the transmission stop (stop of propagation) of the two word periods. All.

Therefore, as shown in Figs. 7c and d, the signals Su and Su are simultaneously transmitted from the handsets 1A and 1B during the periods t ₄ to t ₅ . If the reception levels of the signals Su and Su are close to each other, the base unit 2 cannot receive either of the signals Su and Su correctly.

However, at the time t ₅ , the transmission of the signal Su of the handset 1B stops over the two word periods up to the time t ₇ , so that at this time t ₅ , the base unit 2 receives the signal from the handset 1A. Su can be received.

Then, in the base unit 2, since the detection signal RDET of the signal Su is obtained from the detection circuit 262, the microcomputer 240 continues to enter the check state of the code signal CODE. And, when the seventh-degree is so complete signal CODE of the first word at the time t _6, the identification of the time t ₆ signal CODE code ID that is whether or not the identification code ID and the same is set to the switch (255) are checked When not equal (from another subscriber's handset 1), subsequent processing is not performed and the standby state is continued, but when it is equal, the individual HAND in the signal CODE is checked continuously. In the present case, since the handset 1A is shown at HAND = "01", the base unit 2 has the HAND = "01" from time t ₆ to time t ₈ as shown in FIG. 7A. The code signal CODE is transmitted once (echoback).

To that end, a signal CODE with HAND = “01” is received on both handsets 1A and 1B and at time t _{8 a} code HAND is obtained on both handsets 1A and 1B. This code HAND is checked for each handset 1A, 1B. As a result of this check, in the handset 1A, since HAND = " 01 " is the same as the individual code HAND set in the switch 156, the formation of the ring tone signal in the forming circuit 164 is stopped. As shown in FIG. 7B, the ring tone stops and the muting of the amplifier 127 is released by the signal MUTE.

Further, in the handset 1B, as a result of the check, HAND = "01" is different from the individual code HAND (= "10") set in the switch 156. As shown in FIG. However, at the same time, the transmission of the signal Su is also stopped.

In addition, when even the end of a transmission signal CODE at the time t ₈ to the base unit 2, the muting of the amplifier 227 by the signal MUTE is turned off.

Therefore, at the time t ₈ after that so as to transmit only the handset (1A), the time t ₈ later, and the communication channel between the handset (1A) and the base unit 2 operates normally, the handset (1A) You can answer the incoming call and talk as described above.

Then, in the handset 1B, the transmission of the signal Su is stopped at the time t ₈ , and the LED 166 is turned on, whereby the base unit (by the handset 1A) is supplied to the user of the handset 1B. The channel with 2) is blocked. And when the telephone line of the external line in the handset 1A is finished, transmission of the signal Sd in the base unit 2 is stopped, but this is detected by the signal RDET in the handset 1B and the LED 166 is detected. Is turned off, indicating that the channel with the base unit 2 is empty.

In this way, when the handsets 1B and 1A respond at the same time points t ₃ and t ₄ as in Fig. 7, the handset 1A can be called.

In the case where only the handset 1A is answered and when both the handsets 1A and 1B respond, the radio wave of the handset 1B is weak and no interference occurs. 8 also has a code signal cODE from the handset (1A) is obtained since, the code signal cODE specifying the handset (1A) at time t ₆ is transmitted, the handset at the time t ₈ to the time t _6, as shown in ( A communication channel is formed between 1A) and the base unit 2.

In addition, when only the handset 1B responds and when both the handsets 1A and 1B respond, the radio waves of the handset 1A are weak so that no interference occurs. A communication channel is formed between and (2).

On the other hand, when the external telephone is dialed from the handset 1, the following operation is performed. That is, in the handsets 1A and 1B, it is assumed that the torque switch 152 is connected to the torque contact T at the time points t ₁₄ and t ₁₃ as shown in the gen 9 diagram. Then, in the handset 1A, when the switch 152 is connected to the contact point T at the time point t ₁₄ , the transmission of the FM signal Su is permitted by the signal TX based on the output thereof, and the switches 155 and 156 are subsequently performed. The code ID and the HAND are taken out, and the code signal CODE having these code ID and the HAND is transmitted by the signal Su at the time t ₁₄ as shown in FIG. 9A.

Further, when the connection switch 152 at the time t ₁₃ also in the handset (1B) to the contact point T is transmitted to a time point t ₁₃ Ethel code signal CODE Similarly, as shown in Figure 9b by the signal Su.

Therefore, as shown in Figs. 9A and 9B, the signals Su and Su are simultaneously transmitted in the handsets 1A and 1B during the periods t ₁₄ to t ₁₅ . If the reception levels of the signals Su and Su are close to each other, the base unit 2 cannot receive either of the signals Su and Su correctly.

However, at the time t ₁₅ , the transmission of the signal Su of the handset 1B is stopped, so that at this time t ₁₅ , the base unit 2 can receive the signal Su from the handset 1A.

Thus, following the time t ₁₅ ~ t ₁₈ for the processing, such as the 7-degree time point t ₅ ~ t ₈ used which means that the base unit (2) from the first 9c also that the handset (1A to the time point t ₁₆ as shown in Fig. Code signal CODE of code HAND (= " 01 ") is transmitted, whereby a communication channel is formed between handset 1A and base unit 2 at time t ₁₈ , and handset 1A. In the base unit 2, the muting of the amplifiers 127 and 227 is canceled by the signal MUT.

Subsequently, when the dial key 151 is operated in correspondence with the telephone number of the other party in the handset 1A, the code signal CODE having the corresponding dial signal as data DATA is formed by the microcomputer 140, and the modulation circuit 161 is converted into the MSK signal Sm, and transmitted to the base unit 2.

In the base unit 12, the code signal CODE is taken out from the demodulation circuit 263 which is a separate code receiving unit, and is controlled by the microcomputer 240 by the microcomputer 240 based on the data DATA of this signal CODE. Then, the tone-encode signal TE corresponding to the telephone number of the other party is formed, and this signal TE is sent out to the telephone line 3 through the hybrid circuit 231 and the relay circuit 232 through the amplifier 227 again. Therefore, when the other party is called by this signal TE, and the other party comes out on the telephone, a call is possible as described above.

When only one of the handsets 1A and 1B makes a call to the outside line, and when both sides make a call to the outside line at the same time, when one side of the handset is weak and no interference occurs, the handset 1A, ( The code signal CODE from one side of 1B) is received by the base unit 2, the code signal CODE of the code HAND designating one direction is transmitted from the base unit 2, and the call channel is connected between the base unit 2 and the other side. This is formed so that you can make a call to the outside line.

Also, a talk channel is formed between one of the handsets 1A and 1B, for example, between 1A and the base unit 2, and then the other handset 1B makes a talk switch to dial the outside line. When 152 is connected to the coat contact T, a call channel is already formed between the handset 1A and the base unit 2, so that even if the code signal CODE is transmitted from the handset 1B, the base unit 2 In the handset 1B, the signal RDET is obtained from the base unit 2 by the signal Sd in the handset 1B. Then, it is determined that the handset 1A is using the call channel from the absence of a response of this code signal CODE and the acquisition of the signal RDET, indicating that the LED 166 of the handset 1B is lit and in use. do.

Thus, according to the present invention, when two handsets 1A and 1B are used in combination with one base unit 2, when a call is received from the outside line, the handset 1A, 1B Even if both sides try to respond, there is no interference and one side can respond correctly. In addition, when both handsets 1A and 1B attempt to make calls to the outside line at the same time, one side can be correctly connected to the outside line without any interference.

The operations of the circuits 161 to 163 and 261 to 263 can also be implemented by software. In addition, the telephone number of the other party can be transmitted by dial pulse.

In addition, as long as it is a carrier wave transceiver that combines a plurality of accessory machines for one cycle system, the present invention can be applied to a carrier wave interphone using a transceiver, a commercial AC power supply line, and the like.

When two or more handsets are used in combination with one base unit, any one handset can be correctly connected to the outside line without causing a problem of interference even when a plurality of handsets are set in torque mode at the same time.

Claims (1)

In a transmission and reception device in which a plurality of subsidiary machines 1A and 1B are used in combination with one periodic system 2 wirelessly, the plurality of subsidiary machines 1A and 1B have different individual codes, respectively. The plurality of accessory machines 1A and 1B are provided with a separate code transmitter 161 which intermittently transmits the individual codes at different intervals from other accessory machines when the transmission mode is set to the transmission mode. The individual code receiver 263 for receiving the code and the individual code transmitter 261 for carrying the received individual code have the plurality of accessory machines 1A, 1B returned from the periodic system 2. When a separate code receiving unit 163 for receiving an individual code is provided, and the received individual code is its own individual code, a communication channel is formed between the periodic system 2 and when it is not its own individual code. Control to stop transmission afterwards Transmitting and receiving apparatus which comprises with 140.