JP2006031161A - Communication system, transmitter used therefor, and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system further surely receiving a signal from a transmitter by a receiver in occurring a specified event. <P>SOLUTION: The communication system 100 comprises the transmitter 110 transmitting signals in occurrence of events, and the receiver 120 laid in a state where it can intermittently receive the signals from the transmitter 110. The transmitter 110 is adapted so that the transmission time of signal in occurrence of the specified event is longer than that in occurrence of other events. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication system including a transmitter that transmits a signal when an event occurs and a receiver that can intermittently receive a signal from the transmitter, a transmitter used in the communication system, and a communication method.

  Communication systems using a transmitter and a receiver are widely spread.

  Japanese Patent Laid-Open No. 2004-133867 performs a short-time reception operation intermittently at a predetermined cycle, and when a signal transmitted from a transmitter is detected during the intermittent reception operation, reception that holds a predetermined data reception time reception state A remote control signal transmission / reception system for receiving the received content transmitted from the transmitter, wherein the transmitter continuously transmits a remote control signal related to the same command content for the transmission time set by the transmission time setting means. In addition, the receiver intermittently applies power to the receiving circuit for a short time required to detect the presence or absence of the remote control signal with a period equal to or shorter than the transmission time by the reception period control means, and enters the receiving operation state. When a reception output is generated from the reception circuit during the reception operation, the reception state holding means holds the reception circuit in the reception operation state for a predetermined time. According to this, it is not necessary to transmit a signal such as a reception operation start command from the transmitter, the circuit configuration of the transmitter / receiver is simplified, and the transmitter transmits a remote control signal related to the command content. Therefore, it is described that the power consumption of the transmitter can be reduced.

Patent Document 2 includes a portable wireless device and a charger that charges the portable wireless device, and determines whether the portable wireless device is set in the charger and receives an incoming call in the set state. When the mobile radio is a radio device that notifies an incoming call by a preset incoming call notification means and the incoming call notification means by vibration is set, the vibration detection unit in the charger detects the vibration of the portable radio. Detecting and alerting the ringing tone from the speaker provided in the charger, and when the user removes the portable wireless device from the charger after recognizing the alerting by the ringing tone, the ringing tone output from the speaker is stopped Is disclosed. And according to this, when there is an incoming call in a state where the portable wireless device is set in the charger, it is described that the incoming call can be surely notified to the user from the charger.
Japanese Patent Laid-Open No. 2-244897 JP-A-10-308800

  By the way, there is a burglar alarm system including a transmitter attached to a vehicle and a rechargeable portable receiver. Such a burglar alarm system is a mechanism in which a signal transmitted from a transmitter is received by a receiver, and there is a risk of crosstalk if there are multiple similar burglar alarm systems in close proximity. The machine transmits a signal only when an event occurs in which the alarm state of the car alarm changes. And, the car alarm can take four alarm states, a release state, a warning standby state, a warning state, and an alarm state. When the car alarm alarm state changes to a release state, a warning standby state, or a warning state When a normal time event such as occurs, a normal time signal is sent from the transmitter, while there is an intruder into the vehicle or when the vehicle is harmed and the alarm state of the car alarm changes to the alarm state When a specific event occurs in the event of an emergency, an emergency signal is transmitted from the transmitter, and an alarm is issued when the receiver receives the emergency signal. Further, since the receiver is of a rechargeable type, in order to reduce power consumption, a signal from the transmitter can be received intermittently.

  However, in the theft alarm system in which the transmitter as described above intermittently transmits signals and the receiver is also intermittently receivable, the signal transmission from the transmitter and the signal reception by the receiver are synchronized. If the signal is not received by the receiver unless it is, and the communication status is unstable, such as when the probability of occurrence of a communication error is high even when the signal is out of the communication range or within the communication range, the receiver However, there is a problem that a signal is not received, that is, communication failure may occur. If such a communication failure occurs, an alarm will not be issued in an emergency, which becomes a fatal defect as a theft alarm system.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a communication system in which a signal from a transmitter is more reliably received by a receiver when a specific event occurs, a transmitter used therefor, and It is to provide a communication method.

The present invention that achieves the above object is a communication system comprising a transmitter that transmits a signal when an event occurs, and a receiver that can intermittently receive a signal from the transmitter,
The transmitter is configured such that when a specific event occurs, the signal transmission time becomes longer than when other events occur.

  According to the above configuration, in order to prevent the occurrence of crosstalk due to the presence of multiple theft alarm systems of the same type in the adjacent area, the transmitter transmits a signal when an event occurs. When an event occurs, the signal transmission time is longer than when other events occur. Therefore, when a specific event occurs and when other events occur, the signal is received in the same way. The probability that a situation in which no signal is received by the machine will be low. Therefore, when a specific event occurs, the reception probability of the signal from the transmitter at the receiver is increased, thereby suppressing the occurrence of communication failure.

  Here, the time of occurrence of an event is a time when a predetermined situation has occurred or has been detected on the transmitter side, and a time of occurrence of a specific event is a further specific time. Specifically, for example, in a transmitter provided in an automobile, when the alarm state of a car alarm changes, an event occurs, and four alarm states of a release state, a warning standby state, a warning state, and an alarm state Among these, the time when the alarm state changes from the state with the alarm state to the time when the specific event occurs can be mentioned.

  The application of the communication system of the present invention is not particularly limited, and can be used, for example, for an automobile theft alarm transmission / reception application. In this case, when there is an intruder into the vehicle or when the vehicle has been injured, the event is a specific event. The reception probability of is increased.

  As described above, according to the present invention, when a specific event occurs, the transmitter is configured to have a longer signal transmission time than when other events occur. The probability of reception at the receiver of the signal from the machine can be increased, thereby suppressing the occurrence of communication failure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a burglar alarm system (communication system) 100 for a vehicle C according to an embodiment of the present invention.

  The burglar alarm system 100 includes a transmitter 110 mounted on a vehicle C and a rechargeable portable receiver 120.

  The transmitter 110 includes a transmission circuit unit (not shown), an antenna unit connected to the transmission circuit unit, and a control system, and is configured such that the control system controls the transmission circuit unit. The transmitter 110 includes a car alarm (not shown) having a contact sensor, a human sensor, and the like connected to the control system. The car alarm can be set in four alarm states: a release state, a warning standby state, a warning state, and an alarm state.

  The receiver 120 includes a microcomputer 121 including a CPU and a power supply circuit unit 122, a receiving circuit unit 123, and an output unit 124 connected to the microcomputer 121, and the microcomputer 121 is configured to control each unit. . The power supply circuit unit 122 has a rechargeable storage battery, and the storage battery is charged by setting the receiver 120 on a charging stand or by connecting to a charging cord. A reception antenna 125 and a power supply circuit unit 122 are connected to the reception circuit unit 123, respectively. The output unit 124 includes a buzzer driving unit that issues an alarm, a vibrator driving unit that vibrates the receiver 120, a liquid crystal display unit, and the like.

  Next, the operation of the theft alarm system 100 will be described.

  The transmitter 110 transmits a signal only when an event occurs in which the alarm state of the car alarm changes, thereby avoiding the occurrence of a melee when there are a plurality of similar systems in close proximity. Here, the signal transmitted from the transmitter 110 is configured in units of one frame time and includes ID information and alarm state change information of the receiver 120, and the alarm state change information is in the release state, the alert standby state, or the alert state. The signal at the time of occurrence of a normal event that has changed to the normal time signal is the signal at normal time, and the signal at the time of occurrence of a specific event at the time of emergency when the alarm status change information has changed to an alarm status is the signal at the time of emergency.

  The transmitter 110 repeats the normal time signal for N frames at regular time intervals as shown in FIG. 2 when a normal event occurs when the alarm state of the car alarm is in the released state, the standby state, or the warning state is changed. Send. That is, the normal time signal is continuously transmitted for the time of N frames.

  On the other hand, when a specific event occurs in the event of an emergency such as when there is an intruder into the vehicle C or when the vehicle C is harmed and the state of the car alarm is changed to an alarm state, the transmitter 110 may As shown in FIG. 5, the emergency signal is transmitted repeatedly at a certain time interval by M frames (N + M) more than the normal time. That is, the emergency signal is continuously transmitted for the time of (N + M) frames.

  The receiver 120 controls the microcomputer 121 so that the power supply from the power supply circuit unit 122 to the reception circuit unit 123 is intermittent, thereby intermittently turning on, as shown in FIGS. That is, it becomes a receivable state. As described above, the receiver 120 intermittently becomes in a receivable state, so that power consumption can be reduced as compared with the case where the receivable state continues. Note that the reception period of the signal by the receiver 120 is shorter than the transmission period of the signal from the transmitter 110, and the reception period when the signal is received by the receiver 120 is the transmission period when the signal is transmitted from the transmitter 110. Shorter than.

  When a normal time event occurs, the transmitter 110 transmits a normal time signal, and in the receiver 120, the reception circuit unit 123 receives the signal via the antenna 125 and sends it to the microcomputer 121. The microcomputer 121 Recognize that is a normal signal. On the other hand, when there is an intruder into the vehicle C or when the vehicle C is harmed and a specific event occurs in the event of an emergency when a sensor such as a contact sensor or a human sensor detects an abnormality, the transmitter 110 outputs a normal signal. Transmits a different emergency signal, and in the receiver 120, the receiving circuit 123 receives it via the antenna 125 and sends it to the microcomputer 121, and the microcomputer 121 recognizes that it is an emergency signal. Then, an alarm buzzer is sounded by the buzzer driving unit of the output unit 124, vibration is generated by the vibrator driving unit, or a predetermined display is displayed on the liquid crystal display unit. At this time, as described above, when the specific event such as an emergency occurs, the transmitter 110 has a longer signal transmission time than when a normal event occurs, so that the emergency 110 and the normal time are the same. Compared with the case of transmitting a signal, the probability of occurrence of a situation in which the signal is not received by the receiver 120 is reduced. Therefore, in an emergency, the reception probability of the signal from the transmitter 110 at the receiver 120 can be increased, thereby suppressing the occurrence of communication failure.

  In the above embodiment, the burglar alarm system 100 is used as a vehicle burglar alarm transmission / reception application. However, the present invention is not limited to this, and other communication systems may be used.

  The present invention is useful for a communication system including a transmitter that transmits a signal when an event occurs and a receiver that can intermittently receive a signal from the transmitter, a transmitter used in the communication system, and a communication method. is there.

It is a figure which shows a theft alarm system. It is a figure which shows the transmission / reception timing at the normal time. It is a figure which shows the transmission / reception timing at the time of emergency.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Burglary alarm system 110 Transmitter 120 Receiver 121 Microcomputer 122 Power supply circuit part 123 Reception circuit part 124 Output part 125 Antenna C Vehicle

Claims (4)

A communication system comprising a transmitter that transmits a signal when an event occurs, and a receiver that can intermittently receive a signal from the transmitter,
The transmitter is a communication system configured such that when a specific event occurs, a signal transmission time is longer than when another event occurs. The communication system according to claim 1,
A communication system used for transmission / reception of automobile burglar alarms. A transmitter that transmits a signal when an event occurs,
A transmitter configured to have a longer signal transmission time when a specific event occurs than when any other event occurs. A communication method in which a rechargeable receiver receives a signal from a transmitter that transmits a signal when an event occurs,
A communication method in which the transmission time of a signal from a transmitter is made longer when a specific event occurs than when any other event occurs.

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