JPH04315681A - Communication system - Google Patents

Abstract

PURPOSE:To automatically change the frequency of a carrier and avoid radio interference by providing a switch applying an identification code and a generation section transmitting the carrier on a transmitting device, and providing a reception section, a frequency setting section and a judgment section on a receiving device. CONSTITUTION:A transmitting device is constituted of an identification code generation section 1 generating identification codes consisting of a group of signals containing ID codes, a transmission section 2 transmitting the identification code on a carrier, and a frequency generation section 3 generating the frequency set and changed interlockingly with a transmission side switch 1b provided on the identification code generation section 1. A receiving device is constituted of a reception section 4 receiving the carrier from the transmitting device and extracting the identification code, a frequency setting section 5 allowing the reception of the transmitted carrier based on the setting of a reception side switch 6b provided on an identification code judgment section 6, and the judgment section 6 comparing the identification code detected by the reception section 4 with the preset ID code. The identification code and the carrier can be concurrently set and changed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for opening and closing doors of vehicles, houses, etc. using radio waves.

0002

2. Description of the Related Art Conventionally, systems have been generally known that use radio waves to open and close doors of vehicles, houses, etc. without using a key. A transmitting device of such a communication system is shown in FIG.
It consists of an identification code generation section 10 and a modulation section 11 as shown in A). That is, the identification code generation section 10 is constituted by a circuit that generates an identification code consisting of a group of signals such as a header, an owner's ID code, data, and an end mark.The identification code signal is converted into a carrier wave by a modulation section 11. The signal is transmitted from the antenna 11a.

[0003] The receiving device is composed of a receiving section 12 and an identification code determining section 13, as shown in FIG. 3(B). The receiving section 12 includes an antenna 12a and an intermediate frequency amplifier 12.
b, and a detector 12c. antenna 12a
The carrier wave received by the intermediate frequency amplifier 12b is converted into an intermediate frequency band and amplified. Then, the detector 12c demodulates the amplified signal, detects the identification code, and sends it to the identification code determination section 13. The identification code determination unit 13 compares the preset ID code of the owner with the ID code in the demodulated identification code, and if they match, extracts the data part in the identification code to identify the door. Opening and closing.

0004

[Problem to be Solved by the Invention] However, behind the spread of devices that open and close doors using radio waves, the rapid technological advancements in modern times have made it possible to make the device itself smaller and more sophisticated. In addition, due to the spread of vehicles, the need for security has increased due to the opening and closing of vehicle doors and the increase in the number of people not at home.

[0005] Therefore, due to the ease and convenience of portability, devices that use radio waves have rapidly become popular among consumers, and it is rare for nearby residents to use the same frequency to open and close the doors of their vehicles and houses. This is becoming less of a thing.

[0006] Therefore, if neighboring residents use the same frequency to open and close the doors of their vehicles or houses within the same range, the frequencies will overlap and the ID codes of the owners will no longer match, causing the door to be accidentally opened and closed. However, as a result, the door cannot be opened or closed, and communication becomes impossible.

Furthermore, there is a risk of receiving a signal on the wrong channel due to lack of frequency selectivity such as interference, image interference, or cross-modulation in the receiver. Furthermore, even if errors are corrected by adding a header, ECC, end mark, etc. to support multi-channel communication means at the time of transmission, it is useless in the case of interference due to frequency superimposition.

[0008] Furthermore, even if a different carrier frequency is used and the received signal is separated by a band filter on the receiving side and data is extracted, as is commonly used in radio broadcasting and television broadcasting, If the frequencies become the same, superimposition due to interference cannot be avoided.

The present invention has been made in view of these problems, and the transmitting device is equipped with a transmitting side switch that can change the ID code of the owner, and in conjunction with the transmitting side switch. Communication in which the frequency can be changed, the receiving device is also equipped with a receiving side switch for setting the same ID code as the ID code previously set in the transmitting device, and the frequency can be set in conjunction with the receiving side switch. The purpose is to provide a system.

0010

Means for Solving the Problems and Effects In order to achieve the above object, the present invention provides a transmitter including an identification code generation section that generates an identification code, and a modulation section that modulates and transmits a carrier wave containing the identification code. In the apparatus, the identification code generation section includes a transmission side switch for setting the identification code;
A transmitting device characterized by comprising a frequency generating section that generates a frequency whose setting is changed in conjunction with the setting of the transmitting side switch, and a detecting section that receives a carrier wave from the transmitting device and detects an identification code. and an identification code determination unit that determines the authenticity of the detected identification code, wherein the identification code determination unit includes an identification code corresponding to the identification code sent from the transmitting device. According to a communication system comprising: a receiving switch for setting a frequency; and a receiving device comprising a frequency setting section that sets a frequency in conjunction with the receiving switch. By changing the frequency at the same time as changing the identification code using a switch in the transmitting/receiving device, it is possible to avoid communication failure due to the same code and interference due to superimposition of the same frequency.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing the entire configuration of a transmitting device according to the present invention. This transmitter includes an identification code generator 1 that generates an identification code consisting of a group of signals including an ID code.
, a transmitter 2 that transmits the identification code on a carrier wave, and a transmitter switch 1b provided in the identification code generator 1.
The frequency generating section 3 generates a frequency whose setting is changed in conjunction with the frequency generating section 3.

The identification code generator 1 is composed of an identification code generator 1a and a transmitter switch 1b. The identification code generator 1a is a device that generates an identification code for the owner. The identification code consists of a header for synchronizing data import and the owner's PIN number.
D code, data such as door locking command signal and unlocking command signal, ECC for error correction,
It consists of a group of signals including an end mark indicating the end of the identification code. A detailed explanation of this identification code will be given in the determination unit 6 of the receiving device, which will be described later.

[0013] Also, connected to the identification code generator 1a is a transmission side switch 1b which can change the ID code of the owner when the door cannot be opened or closed.

[0014] In this embodiment, the transmitting side switch 1b consists of five individual switches (S1 to S5), and in this embodiment, five ID codes of owners corresponding to each individual switch are prepared. (For example, ASCII
I code: 41(A), 42(B), 43(C), 44
(D), 45(E)) In conjunction with the operation of these individual switches, a frequency corresponding to each individual switch can be generated in the frequency generating section 3, which will be described later. for example,
If you turn on the individual switch S1, the owner's ID code will be ``
41", this code of "41" is sent to the frequency generator 3, and the value shifted from the reference frequency (100MHz in the example) is converted to 10K.
If it is HZ, it is generated by changing the setting to a frequency of 100.001 MHZ. Therefore, by setting the transmitter switch 1b, it is possible to change the carrier frequency at the same time as the owner's ID code, thereby avoiding interference. Note that ID codes other than those described above can also be set by combining individual switches.

The transmitter 2 is composed of a modulator 2a and an antenna 2b, which transmit the address generated by the identification code generator 1a using a carrier wave.

The modulator 2a is a device that transmits an identification code such as the owner's ID code on a carrier wave.

The frequency generator 3 includes a frequency divider 3a that generates an output signal based on a frequency division ratio, a reference signal and an output signal from the frequency divider 3a, and detects a signal that is proportional to the phase difference between them. A phase comparator 3b that outputs, a reference signal generator 3c that generates a reference clock signal, and a differential amplifier 3d that performs amplification proportional to the difference between the signal from the phase comparator 3b and the reference signal. It is comprised of a voltage controlled oscillator 3f that generates an oscillation frequency that changes based on changes in the voltage of the differential amplifier 3d.

Therefore, in the examples, results as shown in Table 1 below are obtained, but combinations other than those shown in Table 1 may be used.

[Table 1]

FIG. 2 is a block diagram showing the entire receiving apparatus. The receiving device receives the carrier wave transmitted from the transmitting device based on the settings of a receiving section 4 that receives the carrier wave from the transmitting device and extracts the identification code, and a receiving side switch 6b provided in the identification code determining section 6, which will be described later. It is comprised of a frequency setting section 5 that makes it possible, and a determination section 6 that compares the identification code detected by the receiving section 4 with a preset owner's ID code, etc.

The receiving section 4 includes an antenna 4a that receives a carrier wave from a transmitting device, a comparison mixer 4b that mixes the received signal and the signal from the frequency setting section 5, and a signal obtained from the comparison mixer 4b. It consists of an intermediate frequency amplifier 4c for amplification and a detector 4d for demodulation.

The comparison mixer 4b is composed of a filter or the like that passes a frequency band determined by the signal generated based on the setting from the receiving side switch 6b, and passes this fixed frequency band and is lower than the received signal. It consists of a circuit that lowers the frequency and converts it to an intermediate frequency that is easier to amplify.

The signal converted to an intermediate frequency that is easy to amplify is amplified by an intermediate frequency amplifier 4c, and the amplified signal is demodulated by a detector 4d to extract an identification code such as the ID code of the received owner. and sends it to the determination section 6.

The determination unit 6 includes an identification code determiner 6a that detects whether a preset ID code and a received ID code match, and a setting that is the same as that of the transmitting side switch 1b provided in the transmitting device. It consists of a receiving side switch 6b which generates the same code.

The identification code determiner 6a is a circuit consisting of an IC that analyzes the identification code obtained by the receiving section 4, consisting of the header, ID code, data, ECC, and end mark. The header is used to recognize that it is an identification code and to synchronize the following code.For example, the code is ASCII code 55.
(01010101), AA (10101010), F
F (11111111) etc. are used.

The ID code is a code composed of the owner's personal identification number, and can be arbitrarily set, and can be changed into five levels in this embodiment using the transmitting side switch 1b provided in the transmitting device. Therefore, when changing the settings of the transmitting side switch 1b of the transmitting device, it is necessary to change the settings of the receiving side switch 6b of the receiving device in a similar manner so that the same code is generated. The data following the ID code is information for opening and closing the door, and includes, for example, a locking signal, an unlocking signal, a locking/unlocking confirmation signal, and the like. ECC is a code required to operate after detecting the header described above and correct an error signal using a certain algorithm. The end mark is a code indicating the end of a group of identification codes made up of signals such as ID codes, and upon detecting this signal, the determination unit 6 can take in the next identification code.

The receiving switch 6b is a switch having the same function as the transmitting switch 1b of the transmitting device, and
If the door cannot be opened or closed due to failure of transmission, etc., the setting of the transmitting side switch 1b of the transmitting device is changed and the setting is manually changed to the same number at the same time.

The frequency setting unit 5 is composed of a circuit that enables reception of the carrier wave from the above-mentioned transmitting device, and includes a frequency divider 5a that generates an output signal based on information from the receiving side switch 6b, and a frequency divider 5a that generates an output signal based on information from the receiving side switch 6b. a phase comparator 5b that outputs an output signal from the device 5a in proportion to the phase difference between it and a reference clock signal; and a reference signal generator 5 that generates the clock signal.
c, a differential amplifier 5d that amplifies the signal from the phase comparator 5b based on a clock signal from the reference signal generator 5c, and a voltage that generates an oscillation frequency according to a change in the voltage of the differential amplifier 5d. It is composed of a controlled oscillator 5e. Each component of the frequency setting section 5 has the same function as the frequency generating section 3 in the transmitting device, so a description thereof will be omitted.

[0028]

As explained above, in the communication system of the present invention, the settings of the identification code and the carrier wave of the transmitted signal can be changed at the same time, so that interference and misreading can be avoided. This also means that when interference from other devices occurs after the communication system is installed, the ID code and frequency of the interference can be avoided by changing the settings of an externally installed switch. Furthermore, as the number of devices that use radio waves has increased in recent years, it is important to eliminate signal interference and interference, and to prepare functions in advance to avoid signal interference and interference even after the equipment has been installed. This has an extremely useful effect on the communication system used.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a transmitting device in this embodiment.

FIG. 2 is a block diagram showing the configuration of a receiving device in this embodiment.

FIG. 3(A) is a block diagram showing the configuration of a transmitting device related to conventional technology, and FIG. 3(B) is a
Similarly, the configuration of the receiving device is shown in a block diagram.

[Explanation of symbols]

1 Identification code generation part 1a Identification code generator 1b Sending side switch 2 Transmission section 2a Modulation section 2b Antenna 3 Frequency generation section 3a Frequency divider 3b Phase comparator 3c Reference signal generator 3d differential amplifier 3f voltage controlled oscillator 4 Receiving section 4a Antenna 4b Comparison mixer 4c Intermediate frequency amplifier 4d detector 5 Frequency setting section 5a Frequency divider 5b Phase comparator 5c Reference signal generator 5d differential amplifier 5e Voltage controlled oscillator 6 Judgment section 6a Identification code determiner 6b Receiving side switch

Claims (2)

[Claims] 1. A transmitting device comprising an identification code generation section that generates an identification code, and a modulation section that modulates and transmits a carrier wave including the identification code, wherein the identification code generation section includes a code for setting the identification code. A transmitter for a communication system, comprising: a transmitter switch; and a frequency generator that generates a frequency whose setting is changed in conjunction with the settings of the transmitter switch. 2. A receiving device comprising: a detection unit that detects an identification code included in a carrier wave; and an identification code determination unit that determines the authenticity of the detected identification code.
Communication characterized in that the identification code determination unit includes a receiving side switch for setting a code corresponding to the identification code, and a frequency setting unit that sets a frequency in conjunction with the receiving side switch. System receiving device.