JP2002218575A - Radio controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio controller composed of a simple and inexpensive circuit that is immune to interference waves over the disturbance of a wideband. SOLUTION: The radio controller is provided with the following items: a PCM modulation transmitter that receives a control signal 1 corresponding to a control variable and transmits PCM-modulated carriers with different frequency bands; antennas corresponding to the carriers with different frequency bands; a PCM decoder 5 that has a high frequency section for carriers to demodulate a PCM modulated control signal from the received carriers and detection circuits 41, 42, and decodes the demodulated manipulated signal to output the control signal and an error signal; and a PCM modulation receiver that has a changeover circuit 7 for receiving the error signal and selecting the received carriers interposed between the high frequency section for the carriers being the pre-stage of the PCM decoder 5, the detection circuits 41, 42 and the PCM decoder 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio control operation device, and more particularly to a radio control operation device using a simple and inexpensive circuit that is not easily affected by wide-band interference.

[0002]

2. Description of the Related Art A conventional example will be described with reference to FIG. FIG.
FIG. 1 is a diagram illustrating an extremely common radio control operation device. FIG. 3A is a diagram illustrating a configuration of a PCM transmitter operated by a pilot, and FIG. 3B is a diagram illustrating a configuration of a PCM receiver mounted on a controlled device on the receiving side. In FIG. 3A, reference numeral 1 denotes a control signal set by the driver. The control signal 1 includes a control signal for controlling the engine output, the tailplane, the auxiliary wing, the rudder and the like. These operation signals are set according to the operation amount by operating the operation stick by the operator. Reference numeral 2 denotes a data processing and PCM generation unit which converts a control signal into a digital signal and a pulse code modulation signal, that is, a PCM signal. Reference numeral 3 denotes a high-frequency modulation and power amplifying unit for the carrier wave, which is a part that performs high-frequency modulation on the carrier wave by the PCM signal, amplifies the power, and sends out the radio wave via the antenna.

In FIG. 3B, reference numeral 4 denotes a high-frequency part of a carrier wave and a detection circuit, which is a part for amplifying and detecting a received modulated high-frequency signal in the high-frequency part. 5
Numeral denotes a PCM decoder and a servo signal generation circuit, which converts the detected PCM data into an input form suitable for the servomotor and outputs the converted data. Normally, a pulse width change: PWM is output. Reference numeral 6 denotes a servomotor that operates by inputting a plurality of servo signals generated and output from the PCM decoder 5, and includes a plurality of servomotors and servos 1 to n corresponding to the above-described controlled objects.

[0004] The operation amount of the engine output, the horizontal tail, the auxiliary wing, the rudder and other controlled objects are included in the control signal set by the operator operating the operation stick, and the PCM transmitter is modulated by the control signal. The modulated carrier wave is transmitted. The PCM receiver mounted on the model airplane or other controlled equipment receives the modulated carrier wave transmitted from the PCM transmitter, detects and decodes the modulated carrier wave, and extracts and extracts the operation amount of the control target included in the control signal. The operation corresponding to the operated amount is performed on the control target.

Referring to FIG. 4, in the above-described radio control steering apparatus, a plurality of PCM transmitters and PCM receivers are provided with different carrier frequencies, respectively.
A radio control operation device has been developed in which a configuration for generating an error signal is added to the PCM decoder 5 of the CM receiver to switch between a plurality of receiver systems. Reference numeral 41 denotes a high-frequency part of the first carrier and a detection circuit, which is a part for amplifying and detecting the received modulated high-frequency signal in the high-frequency part. Reference numeral 42 denotes a high-frequency part and a detection circuit of the second carrier, and a part for amplifying and detecting the received modulated high-frequency signal in the high-frequency part to obtain a PCM data output. In this conventional example, the transmitted control signal 1 further includes a signal for detecting an error. The area where the model airplane flies is a limited area, and since many model airplanes are flying at the same time, interference and other radio interference are likely to occur. In order to cope with this, it is common practice to transmit a signal which generates an error signal upon detecting a radio wave interference, which is included in the control signal 1. Reference numeral 51 denotes a first PCM decoder, which is a PCM decoder that decodes a high-frequency part of the first carrier and a signal demodulated in the detection circuit 41 and outputs a steering signal and an error signal. Reference numeral 52 denotes a second PCM decoder.
An M decoder, which is a PCM decoder that decodes the high frequency part of the second carrier and the signal demodulated in the detection circuit 42 and outputs a steering signal and an error signal. Reference numeral 7 denotes a switching circuit, which is a PCM decoder 5 due to radio wave interference.
When one of the PCM decoder 1 and the PCM decoder 52 outputs an error signal, the other PCM decoder is switched and connected to the servo motor 6. This switching configuration is described in particular in FIG.
Referring to (b), one PCM decoder 5
1 is supplied to the switching circuit 7 via an inverting input of an inverter 91 and a comparator 94, and the error signal detected and output from the other PCM decoder 52 is a cascade connection between the inverter 92 and the inverter 93. It is supplied to the switching circuit 7 via the circuit and the non-inverting input of the comparator 94 and is switched (for details,
See Japanese Patent Publication No. Hei 6-93792).

[0006]

In the prior art shown in FIG. 4, as described above, a PCM decoder for decoding a received PCM signal is provided in each of the carrier wave receiving systems, and an error output from each of the PCM decoders is used. A configuration in which several systems of carrier waves are switched is adopted. That is, the number of PCM decoders corresponding to the number of receivers in a plurality of systems is required. And also about the structure which switches the switching circuit 7, three inverters 91, 92, 93,
A single comparator 94, a plurality of resistors and capacitors in addition to the variable resistor VR are included, and it is not always a simple switching configuration.

The present invention solves the above-mentioned problem by interposing a switching circuit for switching and selecting a carrier wave between a high frequency part of a plurality of carrier waves which is a preceding stage of the PCM decoder and a detection circuit and the PCM decoder. An apparatus is provided.

[0008]

A pulse code modulation transmitter for transmitting a plurality of carrier waves of different bands which are pulse code modulated by a control signal 1 corresponding to an operation amount, wherein the pulse code modulation transmitters have different bands. It has a plurality of antennas corresponding to a plurality of carriers, and has a plurality of high-frequency portions of carrier waves for demodulating a pulse code modulated steering signal from a received carrier and detection circuits 41 and 42, and decodes and steers a demodulated steering signal. PCM decoder 5 that outputs a signal and an error signal
And a switching circuit 7 for switching and selecting a received carrier by inputting an error signal, and a plurality of high-frequency portions of carrier waves and detection circuits 41 and 42, which are in front of the PCM decoder 5, and P
A radio control steering device having a pulse code modulation receiver interposed between the CM decoders 5 was constructed.

Claim 2: In the radio control operation device according to claim 1, the error signal output terminal of the PCM decoder 5 is connected to one input terminal of the AND circuit 81 and the other input terminal of the AND circuit 81. The output terminal of the oscillator 80 is connected to the terminal, the output terminal of the AND circuit 81 is connected to the input terminal of the n-ary counter 82, and the output terminal of the n-ary counter 82 is connected to the input terminal of the switching circuit 7. Radio control and control system. Further, the present invention has a plurality of antennas corresponding to a plurality of carriers having different bands, a plurality of carrier high-frequency sections for demodulating a pulse code modulation control signal from a received carrier, and detection circuits 41 and. A PCM decoder 5 for decoding the demodulated control signal and outputting the control signal and an error signal; and a switching circuit 7 for switching and selecting a received carrier by inputting the error signal. High frequency part of carrier wave and detection circuits 41 and 42 and PCM
A pulse code modulation receiver for a radio control device interposed between the decoders 5 was constructed.

Further, in the pulse code modulation receiver for a radio control device according to the present invention, the error signal output terminal of the PCM decoder 5 is ANDed.
AND circuit 8 connected to one input terminal of circuit 81
1 is connected to the output terminal of the oscillator 80, the output terminal of the AND circuit 81 is connected to the input terminal of the n-ary counter 82, and the output terminal of the n-ary counter 82 is connected to the input terminal of the switching circuit 7. A pulse code modulation receiver for a radio control pilot connected to the end was constructed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the embodiment shown in FIG. PCM with reference to FIG.
In describing the transmitter, 1 indicates a control signal, which is set by the pilot via a control lever or control stick.
When the target to be radio-controlled is a model airplane, the control signal 1 includes signals for controlling the engine output, the horizontal tail, the auxiliary wing, the rudder, and the like. The steering signal 1 further includes a signal for detecting an error. Reference numeral 2 denotes a data processing and PCM generation unit which converts a control signal into a digital signal and a pulse code modulation signal, that is, a PCM signal. As the carrier, a plurality of systems of carriers having different bands are used. However,
For convenience of explanation, the carrier system is composed of the first carrier and the second carrier.
The following description will be made assuming that there are two systems of the carrier wave. As an example, the frequency of the first carrier is 73 MHz and the frequency of the second carrier is 2.4 GHz. Reference numeral 31 denotes a high frequency modulation and power amplification unit for the first carrier,
After the first carrier wave of the signal is subjected to high-frequency modulation and power amplification, the signal is transmitted as a radio wave via an antenna.
Reference numeral 32 denotes a high-frequency modulation and power amplification unit for the second carrier, which is a part for transmitting the second carrier of the PCM signal as a radio wave via an antenna after high-frequency modulation and power amplification. Here, both PCM transmission signals are the same.

Referring to FIG. 1 (b), a PCM receiver will be described. Reference numeral 41 denotes a high-frequency part and a detection circuit of a first carrier wave. It is a part to do. Reference numeral 42 denotes a high-frequency part of the second carrier and a detection circuit, which amplifies and detects the received modulated high-frequency signal in the high-frequency part,
This is the site where data output is obtained. Here, both PCM reception signals are the same. Reference numeral 7 denotes a switching circuit which receives the high-frequency part of the first carrier and the output of the detection circuit 41 and the high-frequency part of the second carrier and the output of the detection circuit 42, and switches and outputs one of them. It is. The details of the switching circuit 7 will be described later in detail. 5 is a PCM decoder, which is the PCM decoder
This part converts data into an input form suitable for the servomotor and outputs the data, and generates and outputs a reception error signal based on a signal for detecting an error. Reference numeral 6 denotes a servo motor which is connected to the PCM decoder 5 and
The operation is performed by inputting a plurality of servo signals generated and output by the above. Engine output, horizontal tail,
A plurality of servo motors and servos 1 to n are provided corresponding to the auxiliary wings, the rudder, and other control objects.

Referring to FIG. 2, a switching circuit and switching driving by an error signal will be described. An error signal output terminal of the PCM decoder 5 is connected to one input terminal of the AND circuit 81, and an output terminal of the oscillator 80 is connected to the other input terminal of the AND circuit 81. An output terminal of the AND circuit 81 is connected to an input terminal of the n-ary counter 82. The output terminal of the n-ary counter 82 is connected to the input terminal of the switching circuit 7. The switching circuit 7 has fixed contacts 71 to 7n connected to the high-frequency portions of the first to n-th carrier waves and the detection circuits 41 to 4n, respectively, and a movable contact 70 switched to these fixed contacts. . If the movable contact 70 of the switching circuit 7 is connected to the high-frequency portion of the first carrier and the fixed contact 71 corresponding to the detection circuit 41, and if no error signal output from the PCM decoder 5 is generated, The PCM receiver operates in the same manner as the conventional PCM receiver shown in FIG. 3B with the carrier as the first carrier.

Here, when the radio wave transmission by the first carrier cannot be performed normally due to the influence of high frequency noise or other radio wave interference, the PCM decoder 5 outputs an error signal. This error signal is supplied to one input of an AND circuit 81. By the way, since the oscillation output is supplied from the oscillator 80 to the other input of the AND circuit 81, the AND circuit 81 conducts when an error signal is supplied to one input thereof, and the oscillation output of the oscillator 80 becomes It is supplied to the n-ary counter 82 and counted. The count result of the n-ary counter 82 is supplied to the switching circuit 7 to drive and switch the movable contact 70 to the fixed contact 72 corresponding to the high frequency section of the second carrier and the detection circuit 42. By this switching, the transmission of the PCM signal is performed by the second carrier.

If the transmission of the PCM signal by the second carrier is normal, no error signal is generated from the PCM decoder 5, so that the AND circuit 81 becomes non-conductive and the oscillation output of the oscillator 80 is supplied to the n-ary counter 82. Is cut off, the movable contact 70 of the switching circuit 7 is locked to the high-frequency part of the second carrier and the fixed contact 72 corresponding to the detection circuit 42, and the transmission of the PCM signal by the second carrier is continued. When radio wave interference occurs in the transmission of the PCM signal by the second carrier and the reception becomes poor, the transmission is similarly switched to the transmission of the PCM signal by the third carrier. Thereafter, switching is sequentially performed to the fourth carrier,..., Nth carrier. If the transmission output by the n-th carrier is poor reception, the count of the n-ary counter 82 returns to the initial value, and the movable contact 70 of the switching circuit 7 is connected to the high-frequency part of the first carrier and the fixed contact 71 corresponding to the detection circuit. Switching is restored. If the radio wave transmission by the first to n-th carrier waves is poorly received due to the influence of radio wave interference, the switching circuit 7 switches to the first
Carrier output → second carrier output → third carrier output →
..., N-th carrier wave output → first carrier wave output...

What is important here is the relationship between the operating speed of the PCM decoder 5 and the oscillator 80. When the time from when the switching circuit 7 is switched to when the PCM decoder 5 outputs a correct decode is t seconds, the oscillation frequency fHz of the oscillator 80 needs to be f <1 / t. In the embodiment of the present invention, t = 0.08 seconds, and the oscillation frequency of the oscillator 80 is set to 10 Hz with a margin.

[0017]

As described above, according to the present invention, the same PC is used by using different carrier frequencies in a plurality of bands.
In a radio control steering device for transmitting an M signal, a high frequency section of a plurality of carrier waves and a detection circuit are connected to one P
In a radio control operation device that is switched and used by a CM decoder via a switching circuit, the switching circuit 7
By interposing between the high-frequency parts of a plurality of carrier waves and the detection circuits 41 and 42 and the PCM decoder 5 which is the preceding stage of the CM decoder 5, only one switching circuit 7 is provided, and a plurality of switching circuits 7 are commonly used. The high frequency part of the carrier and the detection circuits 41 and 42 can be switched and used. In the embodiment, the high frequency part of the carrier wave and the detection circuits 41 and 42
Although only two systems are shown, the effect of reducing the number of PCM decoders in the case of configuring the system into a large number of systems is further increased, and the pulse code modulation receiver for the radio control and steering device as a whole is simple, simple and inexpensive. Things. Also, the switching drive by the switching circuit 7 and the error signal can be configured and implemented by only three extremely simple general circuits including the oscillator 80, the AND circuit 81, and the n-ary counter 82. There is no need to use complicated components such as a microcomputer. Also in this regard, the whole pulse code modulation receiver is simple, simple and inexpensive.

By using frequency modulation of the 73 MHz band as the first carrier and spread spectrum modulation of the 2.4 GHz band as the second carrier, reliability over a wide range of interfering radio waves can be secured. .

[Brief description of the drawings]

FIG. 1 illustrates an embodiment.

FIG. 2 is a diagram illustrating switching driving by a switching circuit and an error signal.

FIG. 3 illustrates a conventional example.

FIG. 4 is a diagram illustrating another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 steering signal 2 data processing and PCM generating unit 31 first carrier high-frequency modulation and power amplification unit 32 second carrier high-frequency modulation and power amplification unit 41 first carrier high-frequency unit and detection circuit 42 second carrier High frequency part and detection circuit of 5 PCM decoder 6 Servo motor 7 Switching circuit

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04B 7/08 H04B 7/08 A 7/12 7/12 H04Q 9/00 301 H04Q 9/00 301B F-term (reference) 2C150 CA09 DK02 DK08 EB01 EB02 ED08 ED13 EF17 EF37 EF39 EG03 EG12 5K048 AA06 BA09 CA13 DB01 DC01 EA01 EA23 EB02 GB05 HA04 HA06 5K059 CC06 DD24 DD25 EE02 5K060 AA12 CC04 DD08 FF00 HH33H

Claims (4)

[Claims] 1. A pulse code modulation transmitter for transmitting a plurality of carriers of different bands pulse-modulated by a control signal corresponding to an operation amount, and a plurality of antennas corresponding to a plurality of carriers of different bands. A plurality of carrier high frequency sections for demodulating a pulse code modulated steering signal from a received carrier and a detection circuit, and a PCM decoder for decoding the demodulated steering signal and outputting a steering signal and an error signal. A pulse code modulation receiver in which a switching circuit for switching and selecting a received carrier by inputting an error signal is interposed between a high frequency part of a plurality of carriers and a detection circuit and a PCM decoder, which is a preceding stage of the PCM decoder. A radio control operation device characterized by the above-mentioned. 2. The radio control device according to claim 1, wherein an error signal output terminal of the PCM decoder is connected to one input terminal of the AND circuit, and an output terminal of the oscillator is connected to the other input terminal of the AND circuit. And an output terminal of the AND circuit is connected to an input terminal of the n-ary counter, and an output terminal of the n-ary counter is connected to an input terminal of the switching circuit. 3. A demodulator having a plurality of antennas corresponding to a plurality of carriers having different bands, a plurality of carrier high-frequency units for demodulating a pulse code modulated steering signal from a received carrier, and a detection circuit. A PCM decoder that decodes the control signal and outputs a control signal and an error signal; and a switching circuit that switches and selects a received carrier by inputting the error signal and a high-frequency part of a plurality of carriers, which is a preceding stage of the PCM decoder and detection. A pulse code modulation receiver for a radio control steering device, interposed between a circuit and a PCM decoder. 4. The pulse code modulation receiver according to claim 3, wherein the error signal output terminal of the PCM decoder is connected to one input terminal of the AND circuit and the other input terminal of the AND circuit. Is connected to the output terminal of the oscillator, the output terminal of the AND circuit is connected to the input terminal of the n-ary counter, and the output terminal of the n-ary counter is connected to the input terminal of the switching circuit. Pulse code modulation receiver for radio control pilots.