JPH0775184A - Transmitter and receiver for remote control - Google Patents

Abstract

PURPOSE:To prevent illegal operations by forming a synthetic wave by superimposing a code signal selected from a code signal storage means to a carrier wave at a different frequency to be generated from a carrier wave forming means based on the output of a signal designating means. CONSTITUTION:A transmission control circuit 11 reads the plural transmission side code signals from a transmission side memory 10. Continuously, specified frequencies f1-f4 of the carrier wave forming means are designated by the signal designating means inside the circuit 11, and the transmission side code signals of the memory 10 are designated in a previously decided order. Next, plural radio waves W1-W4 are formed and transmitted by superimposing the transmission side code signals selected from the memory 10 to the carrier waves at the different frequencies f1-f4 generated from the carrier wave forming means inside a circuit 12 based on the output of the signal designating means inside the circuit 11 by the synthetic signal forming circuit 12. The receiver compares the signal synthesized to the carrier wave corresponding to the transmission side outputted from the detection circuit of a reception side code signal stored in a reception side memory and when it is matched, a lock device is unlocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Especially for remote operation where it is difficult to unlock by using a remote control signal that is synthesized by superimposing an arbitrary code signal selected from multiple code signals on a carrier of an arbitrary frequency selected from multiple frequencies. Related to transmitter and receiver.

[0002]

2. Description of the Related Art For example, as disclosed in Japanese Patent Laid-Open No. 60-138190, a radio wave lock for unlocking or locking a door lock using a radio wave containing a specific code signal is known. This radio wave lock is a portable signal generator that generates a radio wave signal of a specific code, and sends an operation signal to a door lock actuator when the radio wave signal of a specific code generated from the key signal generation circuit is received. And a receiving circuit that operates. This radio lock unlocks the door automatically when the card holder touches the door handle by bringing the card on which the key signal generating circuit that generates the radio signal of the specific code is formed close to the antenna of the receiving circuit. Or it is locked. Therefore, you can operate the lock mechanism with a metal key,
There is an advantage that it is not necessary to store the key signal and the unlocking operation can be performed quickly.

[0003]

By the way, in the conventional remote control device using radio waves of the above kind, since the carrier frequency of the remote control signal emitted from the transmitting device is one type, it is transmitted from the transmitting device. After detecting the carrier frequency of the remote control signal, the same remote control signal can be generated by decoding the code signal by the receiving storage device. Therefore, it is possible to illegally operate the controlled device such as the lock device or the engine by forming the same remote control signal or copying the remote control signal. Therefore, it is necessary to reduce the decipherability of the remote control signal and prevent unauthorized operation of the controlled device.

Therefore, according to the present invention, an illegal operation is performed by using a remote control signal which is obtained by superimposing an arbitrary code signal selected from a plurality of code signals on a carrier of an arbitrary frequency selected from a plurality of frequencies and combining them. It is an object of the present invention to provide a remote control transmitter and receiver that are difficult to operate.

[0005]

A remote control transmitter according to the present invention comprises a carrier wave forming means for generating a plurality of carrier waves of different frequencies, a code signal storing means for storing a plurality of code signals, and a carrier wave forming means. A signal designating unit that designates a specific frequency and a code signal of the code signal storing unit in a predetermined order, and stores the code signal in carriers of different frequencies generated from the carrier forming unit based on the output of the signal designating unit. A composite signal forming means for forming a plurality of composite waves by superimposing the code signals selected from the means, and a signal emitting means for sequentially radiating the plurality of composite waves generated by the composite signal forming means into space.

The remote control receiver according to the present invention further comprises a plurality of receiving means for receiving carrier waves of a plurality of different frequencies through the signal emitting means, a detecting means for extracting a code signal from the output of each receiving means, and a plurality of detecting means. Of the code signal stored in the code signal storage means and the code signal combined with the corresponding carrier wave output from the detection means are compared, And comparing means for applying a drive signal to the controlled device when a predetermined code signal is detected in sequence.

[0007]

In the transmitting device, the carrier of the plurality of different frequencies generated from the carrier forming means is sequentially selected based on the output of the signal designating means, and the plurality of different code signals are sequentially selected from the code signal storing means. The selected code signal is sequentially superimposed on the selected carrier wave to form a plurality of combined waves by the combined signal forming means. These plural composite waves are sequentially radiated from the signal emitting means to the space. The remote control signal transmitted from the transmitting device is received through the signal emitting means of the receiving device, and a plurality of carrier waves and code signals corresponding to the respective carrier waves are extracted from the remote control signals received by the plurality of receiving means and the detecting means. Then, the comparison means compares the code signal stored in the code signal storage means with the code signal combined with the corresponding carrier wave output from the detection means. When the frequencies of the carrier waves match and the code signals corresponding to the carrier waves match, the controlled device is driven when the code signals are received in a predetermined order.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a remote control transmitter and receiver according to the present invention which uses radio waves as a remote control signal will be described below with reference to FIGS. As shown in FIG. 1, the remote control transmitter according to the present invention stores carrier wave forming means (not shown) for generating a plurality of carrier waves of different frequencies f _{1 to} f ₄ and a plurality of transmitter side code signals. The frequencies f _{1 to} f ₄ are specified in a specific order of the transmission side memory 10 as the transmission side code signal storage means and the carrier wave forming means, and the transmission side code signals of the transmission side memory 10 are specified in a predetermined order. A transmission control circuit 11 having a signal designating means (not shown), and a transmission side memory 10 for the carrier waves of different frequencies f _{1 to} f ₄ generated from the carrier wave forming means based on the output of the signal designating means in the transmission control circuit 11. A composite signal forming circuit 12 that forms a plurality of radio waves by superimposing a transmission-side code signal selected from the above, and a signal emission that sequentially emits the plurality of radio waves combined by the composite signal forming circuit 12 into space. And a transmitting antenna 13 as a stage. Although not shown,
In this embodiment, the carrier wave forming means is the composite signal forming circuit 1.
2, the signal designating means is formed in the transmission control circuit 11 by program control. The carrier wave forming means can be composed of, for example, _four oscillators having an oscillation frequency of f _{1 to} f ₄ [Hz].

As shown in FIG. 2, the remote control receiver according to the present invention includes a plurality of receiving circuits 21 for receiving carrier waves having a plurality of different frequencies f _{1 to} f ₄ respectively through a receiving antenna 20, and each receiving circuit 21. A detection circuit 22 for extracting a transmission side code signal from the output of the circuit 21, a reception side memory 23 as a reception side code signal storage means for storing a plurality of reception side code signals, a detection circuit 22 and a reception side memory 2.
Reception control circuit 24 having an input terminal for receiving the output of
And a lock device 25 connected to an output terminal of the reception control circuit 24 via an amplifier circuit 26. The reception control circuit 24 sequentially compares the reception side code signal stored in the reception side memory 23 and the code signal combined with the carrier wave corresponding to the transmission side output from the detection circuit 22, and outputs from the plurality of reception circuits 21. Comparing means (not shown) for applying a drive signal to the lock device 25 as a controlled device through the amplifier circuit 26 when a predetermined code signal is detected in a predetermined order is provided.

In the present embodiment, the use of a non-volatile storage element such as an EEPROM as the transmission side memory 10 and the reception side memory 23 has the advantage that the signals stored in the EEPROM are retained even after the power is turned off. Further, for the transmission control circuit 11 and the reception control circuit 24, for example, a one-chip microcomputer or the like can be used.

The remote control transmitter shown in FIG. 1 is operated according to the operation sequence shown in the flow chart of FIG. From the start of step 30 to step 31,
In step 31, the transmission control circuit 11 reads a plurality of transmission side code signals from the transmission side memory 10. Then, in step 32, the signal designating means in the transmission control circuit 11 designates the specific frequencies f _{1 to} f ₄ of the carrier forming means and the transmitting side memory 1 in step 32.
The transmitting side code signal of 0 is designated in a predetermined order. In this embodiment, the designation is made as shown in the correspondence table of FIG. Next, in step 33, the composite signal forming circuit 12 in step 33 generates different frequencies f ₁ to f from the carrier wave forming means in the composite signal forming circuit 12 based on the output of the signal designating means in the transmission control circuit 11. The transmission side code signal selected from the transmission side memory 10 is superimposed on the carrier wave of f ₄ to form a plurality of radio waves W _{1 to} W ₄ . In this embodiment, as shown in FIG. 6, the frequencies “f ₃ , f ₂ , f
₄ , f ₂ , ... ", and the duty ratio t _{0 is applied} to a plurality of carriers.
/ (T ₀ + t ₁ ) pulse is 0, duty ratio t ₀ / (t ₀ +
A plurality of radio waves W _{1 to} W ₄ are formed by superposing the transmission code signals “3, 5, 7, 8, ...”, each of which is composed of a 4-bit pulse train, with the pulse of t ₂ ) as 1. . afterwards,
Proceeding to step 34, the plurality of radio waves W _{1 to} W ₄ synthesized by the synthesized signal forming circuit 12 in step 34 are sequentially radiated from the transmitting antenna 13 to the space. After radiating a plurality of radio waves W _{1 to} W ₄ , the process proceeds to step 35 and ends.

Further, the remote control receiver shown in FIG.
The operation is performed according to the operation sequence shown in the flowchart of FIG. From the start of step 40 to step 41, in step 41, the plurality of receiving circuits 21 transmit the plurality of radio waves W ₁ to
When W ₄ is sequentially received, the process proceeds to step 42. When the receiving circuit 21 does not receive the plurality of radio waves W _{1 to} W ₄ from the transmitting device, the process returns to step 41. In step 42, the plurality of receiving circuits 21 respectively receive the carriers of the frequencies f _{1 to} f ₄ included in each of the plurality of radio waves W _{1 to} W ₄ , the order of the carriers is read, and the carriers are sequentially input to the detection circuit 22. It Then, in step 43, the detection circuit 22 extracts the transmission side code signal from each output of the plurality of reception circuits 21 and outputs it to the reception control circuit 24 in step 43. After that, the process proceeds to step 44, and in step 44, the reception control circuit 24 determines whether or not the transmission side code signal is detected from each reception circuit 21 in a predetermined order. When the transmitting side code signal is detected from each receiving circuit 21 in a predetermined order, the process proceeds to step 45, and when it is not detected, the process directly proceeds to step 48 and ends. In step 45, the reception control circuit 24 reads the reception side code signal from the reception side memory 23. Next, in step 46, the comparison means in the reception control circuit 24 combines the reception side code signal stored in the reception side memory 23 and the carrier wave corresponding to the transmission side output from the detection circuit 22 in step 46. Compare with code signal. When the transmission side code signal and the reception side code signal match, the process proceeds to step 47,
In step 47, the comparison means in the reception control circuit 24 applies a drive signal to the lock device 25 through the amplifier circuit 26, and operates the lock device 25 to unlock. After the operation of the lock device 25, the process proceeds to step 48 and is completed. In step 46, when the transmission side code signal and the reception side code signal do not match, the process directly proceeds to step 48 and ends.

In the above embodiment, a plurality of different frequencies f
The transmission side code signal of the transmission side memory 10 is superposed on the carrier waves of _{1 to} f ₄ by the transmission device to form a plurality of radio waves W _{1 to} W ₄ and sequentially transmitted. In addition, a plurality of radio waves W ₁ received by the receiving device
To the transmission side code signal included in W ₄ and the reception side memory 23
The lock device 25 is operated when the received code signals stored in the receiver are compared with each other, and when they match each other and the transmitter code signals are detected from each receiving circuit 21 in a predetermined order. Therefore, the frequencies of the radio waves W _{1 to} W ₄ match, the code signals corresponding to the radio waves W _{1 to} W ₄ match, and at the same time, when the code signals are received in a predetermined order, the locking device 25
Is activated, it becomes substantially impossible to decipher the code signal, and it is possible to prevent the lock device 25 from being unlocked illegally and improve the antitheft property.

The embodiment of the present invention is not limited to the above-mentioned embodiment and can be modified. For example, although an example in which a nonvolatile storage element such as an EEPROM is used as the transmission side memory 10 and the reception side memory 23 is shown, a normal ROM (read only memory) or another storage element may be used. Further, in the above-described embodiment, an example in which a one-chip microcomputer or the like is used as the transmission control circuit 12 and the reception control circuit 24 is shown, but it is also possible to configure it as a discrete circuit. Furthermore, although the present invention is applied to the lock device in the above embodiment, it is obvious that the present invention can be applied to other control devices than the lock device.

[0015]

As described above, according to the present invention, it is possible to selectively combine carrier waves of a plurality of frequencies and a plurality of code signals in a predetermined order to form a remote control signal. It is possible to reduce the possibility and prevent unauthorized operation of the controlled device.

[Brief description of drawings]

FIG. 1 is a block diagram of an electric circuit showing an embodiment of a remote control transmission device according to the present invention.

FIG. 2 is a block diagram of an electric circuit showing an embodiment of a remote control receiver according to the present invention.

FIG. 3 is a flowchart showing an operation sequence of the transmission device of FIG.

FIG. 4 is a flowchart showing an operation sequence of the receiving device in FIG.

FIG. 5: Correspondence table between transmission side code signal and carrier frequency

FIG. 6 is a waveform diagram showing a plurality of radio waves W _{1 to} W ₄ .

[Explanation of symbols]

10. ． ． Sending side memory, 11. ． ． Transmission control circuit, 1
2. ． ． Synthetic signal forming circuit, 13. ． ． Transmitting antenna,
20. ． ． Receiving antenna, 21. ． ． Receiver circuit, 2
2. ． ． Detection circuit, 23. ． ． Receiving side memory, 2
4. ． ． Reception control circuit, 25. ． ． Lock device (controlled device), 26. ． ． Amplifier circuit

Claims (2)

[Claims] 1. A carrier wave forming means for generating a plurality of carrier waves of different frequencies, a code signal storing means for storing a plurality of code signals, a specific frequency of the carrier wave forming means, and a code signal of the code signal storing means. And a code signal selected from the code signal storage means is superimposed on the carrier waves of different frequencies generated by the carrier wave forming means based on the output of the signal specifying means. A remote control transmission device comprising: a composite signal forming means for forming a wave; and a signal emitting means for sequentially radiating a plurality of composite waves generated by the composite signal forming means into space. 2. A plurality of receiving means for respectively receiving a plurality of carrier waves of different frequencies through the signal emitting means, a detecting means for extracting a code signal from the output of each receiving means, and a code signal storing means for storing the plurality of code signals. And comparing the code signal stored in the code signal storage means with the code signal combined with the corresponding carrier wave output from the detection means and detecting a predetermined code signal from a plurality of receiving means in a predetermined order. In addition, the receiving device for remote operation is characterized by further comprising a comparing means for giving a drive signal to the controlled device.