JP3229134B2 - Two-wire communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables transmission and reception of power and control data using two communication lines, and allows a user to listen to a radio broadcast anywhere by connecting an audio output device to the communication line. The present invention relates to a wire communication device.

[0002]

2. Description of the Related Art Conventionally, a communication device using a two-core non-polar communication line to operate devices such as a water heater and a bathtub bubble generator (bubble bath) by a remote controller installed at a remote location. Is widely used. In these communication devices, control data is transmitted and received using two communication lines, and power is supplied to the remote controller using the two communication lines.

[0003] By the way, there has already been proposed a device for further communicating an audio signal using the communication line of the communication device as described above (Japanese Utility Model Laid-Open No. 63-82147). The system according to the invention modulates the control data signal at a high frequency,
This is a system that enables transmission of a control data signal, an audio signal, and power through two communication lines by superimposing this on a baseband audio signal. In this device, audio signals are transmitted and received by an interphone connected to a communication line. Here, if the audio signal output from the radio receiver is output to this communication line, the radio broadcast can be heard using the interphone connected to the communication line.

[0004]

However, communication devices for control data used in such communication devices include:
Since a high-frequency modulation / demodulation circuit must be installed in advance, there is a problem in that when a device that communicates only control data in addition to power using this communication device is assembled, the cost increases. In other words, the communication device used in such a device has a problem that its versatility is reduced.

On the other hand, a method of modulating and transmitting an audio signal output from a radio receiver using a communication line of an existing two-wire communication device that communicates control data in baseband is also conceivable. In such a case, the following problems occur.

In such an existing two-wire communication device, when communication of control data is performed from a master unit that supplies power to another device to another device, a current flowing through the communication line is used. Rapidly changes, an electromagnetic wave containing many high-frequency components is emitted from the communication line. Therefore, when a radio receiver is connected to this communication line, it is not possible to properly receive a radio broadcast. Further, in order to prevent such radiation of electromagnetic waves, an expensive shielded wire such as a coaxial cable must be used as a communication line. Therefore, when an existing communication device uses a two-core pair wire as a communication line, a construction for changing the two-core pair wire to a shield wire is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a communication line of a two-wire communication device for transmitting and receiving control data in baseband and transmitting and receiving power is a two-core pair line. In this case, the radio broadcast can be received well, and the radio broadcast can be heard anywhere by simply connecting the audio output device to the communication line.
It is an object to provide a line communication device.

[0008]

SUMMARY OF THE INVENTION A two-wire communication apparatus according to the present invention modulates radio broadcast audio to generate a modulated audio signal.
A radio receiving device for outputting to two communication lines;
Connected to a communication line to receive and demodulate the modulated audio signal
Output sound and follow the input signal from the actuator.
Output a control signal to the radio receiver.
An audio output device having a control data transmission circuit;
To the other devices connected to this communication line.
Power is supplied using the signal line, and this power supply is turned on / off.
Data to the other device in baseband.
And the master unit transmits the data.
When the rise and fall of the base band
The by slow is to and a waveform modifying unit which gradual changes in the voltage between the two communication lines.

[0009]

In the two-wire communication apparatus according to the present invention, when the master unit turns on / off the supply of power to another apparatus to transmit control data to another apparatus, the two-wire communication apparatus uses the two-wire communication apparatus. Since the change in voltage between the two communication lines is made gentle, the current flowing through the two communication lines does not change abruptly. Therefore, when the master unit transmits control data, an electromagnetic wave containing many high-frequency components is not emitted from the communication line, and does not affect the reception of the radio broadcast. Also, via the two communication lines
Sound for receiving the modulated wave signal output from the radio receiver
According to the input signal from the operation device, the voice output device
Control data transmission that outputs control signals to the geo-reception device
Radio circuit and audio output device
Even if is far away, channel selection from audio output device side, on / off
Operations can be performed.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a two-wire communication device according to the present invention. In FIG. 1, reference numeral 100 denotes a control device provided in a device body such as a water heater, 200 denotes a remote controller installed in a bathroom or a kitchen,
300 is a tuner unit for receiving a radio broadcast (radio
Reference numeral 400 denotes a speaker unit (audio output device) that outputs audio of a radio broadcast.

Here, the power supply circuit 10 in the control device 100
1 supplies a voltage obtained by transforming and rectifying a commercial power supply (AC 100 V) to each unit in the control device 100, and also supplies a power supply voltage to other devices connected to the communication line. The control data communication unit 102 in the control device 100 transmits control data to another device by controlling on / off of a power supply voltage supplied from the power supply circuit 101 to another device. The control data communication unit 102 is a high-frequency choke coil 103, 10
4 are connected.

The control data communication unit 201 in the remote controller 200 is the same as that used in the conventional two-wire communication device.
1 is also connected to a communication line via high-frequency choke coils 203 and 204.

The tuner unit 300 has a built-in radio tuner 301 for selecting and detecting radio waves output from a radio broadcast station and outputting an audio signal. Also, 3
02 is a control data communication unit for transmitting and receiving information such as reception frequency information and reception status, and 303 is a radio tuner 3
This is an audio signal modulation unit for modulating the audio signal output from 01 and outputting it to the communication line. L1 and L2 are high frequency choke coils for cutting high frequency components due to the carrier wave of the audio signal, and C1 and C2 are bypass capacitors for cutting DC components.

The tuner unit 300 may be installed anywhere as long as it can be connected to a communication line. However, since equipment such as a water heater is usually installed outdoors, it is installed outdoors near this equipment. Then, the reception condition of the radio wave is improved, and the communication line need not be lengthened unnecessarily. Further, since the power supply voltage of the tuner unit 300 is supplied from the communication line, it is not necessary to supply power to the tuner unit 300 from the outside or to provide a battery or the like in the tuner unit 300.

The speaker unit 400 incorporates an audio signal demodulator 403 for demodulating a modulated radio audio signal output from the tuner unit 300, a power amplifier 404 for outputting audio, and a speaker 405. . A control data communication unit 402 for transmitting and receiving control data for controlling the radio tuner 301;
Reference numeral 406 denotes a display for displaying a reception frequency and a reception state, and 407 denotes an operation device including a switch for turning on / off radio reception, a switch for selecting a reception frequency, and the like. L3 and L4 are high frequency choke coils, C
3 and C4 are bypass capacitors.

A plurality of speaker units 400 can be installed.
It is also possible to output sound from 0 simultaneously. Further, since the speaker unit 400 is supplied with power from the communication line, it is not necessary to supply power from the outside or to incorporate a battery or the like.

In the two-wire communication device shown in FIG. 1 described above, a two-core pair wire or a shield wire may be used as the communication wire. Therefore, any existing communication line can be used.

Next, the control data communication unit 102 in the control device 100 functioning as a master device for controlling the supply of power to other devices will be described. FIG. 2 is a circuit diagram showing a configuration of the control data communication unit 102 in the control device 100.
This communication unit is supplied with the voltage V _DD from the power supply circuit 101. When the transistor Q1 is turned on, this voltage V _DD is supplied.
_DD is supplied to other devices as a power supply voltage via a communication line.

In FIG. 2, R1 to R4, R10 to R1
2 is a resistor, Q1 and Q2 are transistors, C10 is a capacitor, ZD1 is a Zener diode, 21 is an input terminal for inputting a control signal for controlling power supply to another device and a control data signal to be transmitted to another device, 22 Is an output terminal for outputting a control data signal received from another device, 23 and 24 are connection terminals for communication lines, 25 is a receiving circuit for receiving a control data signal transmitted from another device, and 103 and 104 are chokes. Coil. Here, the data receiving circuit 25 is the same as that used in the conventional device.

Next, the communication unit 102 configured as described above
Will be described with reference to FIG. FIG. 3 is a waveform diagram showing a state of a change in the voltage of each section shown in FIG. Here, it is assumed that the control data signal shown in FIG.

First, when the control data signal changes from "L" level to "H" level, the transistor Q2 is turned on as shown in FIG.
Is turned on as shown in FIG. When the transistor Q2 turns on, the charging current of the capacitor C10 flows to the transistor Q2 via the resistor R2, and the capacitor C10 is charged.
Is the voltage across the its rises gradually as shown in Figure 3 (d). This change is determined in advance by the time constant of the capacitor C10 and the resistor R2 constituting the charging circuit . The base current of the transistor Q1 in accordance with the increase of the voltage across capacitor C10 is increased. To the collector current is also increase in transistor Q1 according to increase in the base current of the transistor Q1, the terminal 23,2
The voltage output from 4 to the communication line gradually increases as shown in FIG.

Next, when the control data signal changes from "H" level to "L" level, transistor Q2 is turned off. When the transistor Q2 is turned off, the voltage between the terminals of the capacitor C10 causes the transistor Q10 to operate as shown in FIG.
The state is turned on as shown in FIG. Here, since the Zener diode ZD1 is provided, the charge of the capacitor C10 is discharged via the resistor R11. With the discharge of the capacitor C10, the capacitor C10
Of FIG. 3 gradually decreases as shown in FIG. This change is caused by the capacitor C10 constituting the discharge circuit.
And the time constant of the resistor R11. As the voltage across capacitor C10 decreases, the base current of transistor Q1 decreases. Since the collector current of the transistor Q1 decreases as the base current of the transistor Q1 decreases, the voltage output to the communication line from the terminals 23 and 24 gradually decreases as shown in FIG.

As described above, according to this communication unit, the change in the collector current when turning on / off the transistor Q1 can be made gradual, and the change in the current flowing through the communication line can be made gradual. Therefore, when transmitting control data, it is possible to prevent the emission of electromagnetic waves containing a large amount of high-frequency components.

FIG. 4 is a block diagram showing the configuration of the tuner unit 300 in detail. 4, a control data communication unit 302 includes a transmission circuit 41 that transmits control data in baseband, a reception circuit 42 that receives control data from another device, and a signal output from the control device 100 as reception data. Data / power supply separation circuit 43 for separation from power supply
It is composed of Reference numeral 44 denotes a power supply circuit for stabilizing a power supply voltage supplied via a communication line.

The audio signal modulating section 303 modulates the audio signal output from the radio tuner 301 with a high-frequency carrier wave.
6.

The CPU 47 includes the tuner unit 3
The control data is transmitted to the radio tuner 301, and the ON / OFF signal of the operation is transmitted to the modulation circuit 46. Further, the CPU 47 monitors the reception state of the radio tuner 301 and transmits the result to the speaker unit 400 as control data. Thus, the CPU 47 controls each section of the tuner unit 300. Here, T1 is a high frequency transformer provided for performing impedance conversion and transmitting only the frequency component of the carrier.

FIG. 5 is a block diagram showing the configuration of the speaker unit 400 in detail. In FIG. 5, the control data communication unit 402 includes the control data communication unit 30 described above.
Similarly to the configuration 2, the control data transmission circuit 51, the control data reception circuit, and the data / power supply separation circuit 53 are configured. Reference numeral 54 denotes a power supply circuit for stabilizing the power supply voltage. The audio signal demodulation circuit 55 takes in only the frequency component of the carrier output from the tuner unit 300 via the bypass capacitors C3 and C4 and the high-frequency transformer T2, demodulates the carrier, and converts it into an audio signal. Output to Radio broadcast sound is output from the speaker 405 in accordance with the output of the power amplifier 404. The CPU 56 controls transmission and reception of control data in accordance with signals input from the control data receiving circuit 52 and the operating device 407, and controls the audio signal demodulation circuit
The power supply to the power amplifier 404 is controlled, and the entire speaker unit 400 is controlled.

Next, a description will be given of signals transmitted in this communication system composed of the respective devices described above. FIG. 6 is a waveform diagram showing voltage waveforms of the components a to c of the tuner unit shown in FIG. FIG.
FIG. 6A is a waveform diagram of a control data signal for performing communication in baseband, and FIG. 6B is a waveform diagram of an amplitude-modulated audio signal. The signal shown in FIG. 6A and the signal shown in FIG.
Is superimposed on the communication line, and the signal on the communication line has a waveform as shown in FIG. Although the audio signal is amplitude-modulated in FIG. 6B, the modulation method of the audio signal in this communication system is not limited to this amplitude modulation, and any modulation method such as frequency modulation and phase modulation is used. It may be.

As described above, according to this communication system, the master unit that supplies power to another device controls transmission of control data by controlling on / off of the supply of power to another device. In this case as well, since the voltage between the communication lines does not change rapidly and the current flowing through the communication line changes slowly as shown in FIG. 3 (e), it contains many high-frequency components that adversely affect radio reception. However, electromagnetic waves are not emitted from communication lines.

In the communication system shown in FIG. 1, tuner unit 300 and speaker unit 4
Even without 00, control data communication between the control device 100 and the remote controller 200 can be performed. Therefore, in this communication system, first, the control device 100 and the remote controller 200 are arranged,
If the two are connected by a communication line, the tuner unit 300 and the speaker unit 400 are connected to the existing communication line later.
Can be connected. Further, the speaker unit 400 can be added later. Even in such a case, according to this communication system, there is no need to exchange or change the existing control device 100 and the remote controller 200, and the existing communication line can be used as it is.

[0031]

As described above, according to the present invention, when a master unit that supplies power to another device transmits control data in baseband, it gradually changes the voltage between communication lines. The two-wire communication device that transmits and receives control data and transmits and receives power is a two-core paired wire because the transmission and reception of control data is performed in baseband.
Radio broadcasting can be satisfactorily received, and radio broadcasting can be heard anywhere by simply connecting an audio output device to a communication line. In addition, the line is connected via the two communication lines.
Sound to receive modulated wave signal output from geo receiver
In accordance with the input signal from the operating device,
Control data transmission to output control signals to receivers
With the circuit, the radio receiver and audio output device
Control the radio receiver from the audio output device even if you are far away.
The user can select a channel and perform an on / off operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a two-wire communication device according to the present invention.

FIG. 2 is a circuit diagram showing a configuration of a control data communication unit in the control device shown in FIG.

FIG. 3 is a waveform chart showing voltage waveforms at various parts of the circuit shown in FIG. 2;

FIG. 4 is a block diagram illustrating a configuration of a tuner unit.

FIG. 5 is a block diagram illustrating a configuration of a speaker unit.

FIG. 6 is a waveform chart showing voltage waveforms at various parts of the tuner unit shown in FIG.

[Explanation of symbols]

 Reference Signs List 21 input terminal 22 output terminal 23, 24 connection terminal 25 control data receiving circuit 100 control device 101 power supply circuit 102, 201, 302, 402 control data communication unit 103, 104, 203, 204 choke coil 300 tuner unit 301 radio tuner 303 voice Signal modulator 400 Speaker unit 403 Audio signal demodulator 404 Power amplifier 405 Speaker 406 Display 407 Operator C1 to C4, C10 Capacitor L1 to L4 Choke coil Q1, Q2 Transistors R1 to R4, R10 to R12 Resistor ZD1 Zener diode

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-111223 (JP, A) JP-A-60-10822 (JP, A) JP-A-59-158629 (JP, A) 93345 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 3/54 H02J 13/00 H04Q 9/00 311 H05B 37/02 G08B 25/01 G08C 19/00

Claims (1)

(57) [Claims] 1. A radio receiving apparatus that receives a radio broadcast, modulates the sound of the received radio broadcast into a modulated audio signal, and outputs the modulated audio signal to two communication lines. It is connected to line, to receive the modulated audio signal, and outputs the audio and demodulates the modulated audio signal together
The radio receiving device according to the input signal from the operating device.
Control data transmission circuit that outputs control signals to the
A power supply using the two communication lines to an audio output device to be connected to the other device connected to the two communication lines, and turning on / off the supply of the power to the other device. A base unit that transmits data in baseband to the device of
When the parent machine performs transmission of the data, the baseband
A two-wire communication device comprising: a waveform deforming device that makes the rising and falling changes of the signal slow and makes the voltage change between the two communication lines gentle.