JPS60112329A - Transmitter - Google Patents

Abstract

PURPOSE:To obtain a miniature transmitter which has high probability of transmission and high efficiency with a low level of power in a security system for prevention of disasters, crimes, etc., by using a transmission means which operates just for a fixed period in response to the irregular information produced by an irregular information generating means. CONSTITUTION:The data given from slave devices 311-31n are transmitted to a receiver 34 of a master device 33. While the device 33 transmits data when necessary from devices 311-31n via a home bus 35. The clocks generated by a clock generator 41 in a fixed cyclly are counted by a counter 42. A random number generator 43 serves as a memory element where the count number is previously written at random to an ROM. A comparator 44 compares the count number of random numbers generated from the generator 43 with the output of the counter 42 and generates a pulse C only when the coincidence is obtained. In such a constitution, it is possible to reduce the probability where plural slave devices perform transmission simultaneously and consecutively by providing the generator 43 independently to each of devices 311-31n.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a transmitter for transmitting data from a group of detectors to a main body in a security system such as disaster prevention or crime prevention. .

Conventional configuration and its problems Conventionally, in the detection of disaster prevention and crime prevention, a group of detectors (e.g., smoke sensors, gas sensors, window opening/closing sensors, etc.) would issue an alarm by itself with a buzzer etc. when it detected an abnormality. emanate. Now, in recent years, in order to centrally control information in the home, consideration has been given to creating a home bus centering on home computers, and one of the things connected to this home bus is a security/system.

In the system currently being considered, the parent bird inquires of the 1,000 birds one after another, and in response, each detector in the 1,000 birds transmits the information to the parent bird.

A conventional security system will be described below with reference to the drawings.

FIG. 1 shows the block configuration of a conventional security system.

In FIG. 1, 11 is a detector such as a smoke sensor or a gas sensor, and when an abnormality is detected, the abnormality is modulated by a modulator 13, and transmitted as a radio wave from an antenna 14, and the information is transmitted to the parent feather. has been done.

According to the above configuration, an alarm and radio waves are emitted only when an abnormality occurs, so if a battery is used as a power source, it has the advantage of reducing power consumption, but since it is not possible to communicate with the parent clan except when an abnormality occurs, the detector may fail. It has the disadvantage that it cannot transmit information such as , battery exhaustion, etc., and there is no guarantee that it will operate reliably in the event of an actual abnormality.

On the other hand, FIG. 2 shows another conventional example.

In FIG. 2, 21 is a pass line, and one of the things connected to this pass line 21 is a parent clan 22.

The parent domain 22 is the transmission line 231.232...23n
Senba 241°242...
When connecting from the parent domain 22 connected to the Senba group 24 of 24n to, for example, the Senba group 241, the transmission line 231 (
a), and the data of Senba 241 is transmitted via transmission path 231 (
b) is sent to the parent domain 22.

According to the above configuration, the information required by the parent clan 22 can be delivered to the Senba 241 to 24n when necessary, so that problems such as battery exhaustion or detector failure that occur with the configuration explained in FIG. 1 can be avoided. Although it has the advantage of being able to grasp the situation before an actual abnormal situation occurs, it is impossible to predict when the Oyahan 22 will make an inquiry, so each Senba 241-24
It is necessary to keep the reception status of n at all times, and 241 senba
There is a drawback that power consumption increases when the 24n is driven by batteries.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks.
The purpose of the present invention is to provide a transmitter that uses low power such that it can be driven by a battery or the like, and that can transmit the status of the detector to the relatives within a certain period of time.

Structure of the Invention The present invention provides irregular information generating means for generating irregular information, and transmitting means for transmitting only for a certain period of time in accordance with the irregular information generated by the irregular information generating means. This aims to achieve the above objectives.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a block configuration of a transmitter in an embodiment of the present invention.

In Figure 3, 31 is a group of 1,000 birds, each 311°31
2... Consisting of 31n. 32 is a transmission medium, and antennas 321 .
322...32n. Senba 311
The data from ~31n is transmitted to the receiver 34 of the parent clan 33 via a transmission path (Figure 3 shows the case where radio waves are used with an antenna, but this also includes transmission paths such as external lines and Zhao sound waves). be done. From Oyahan 33, home bus 3
5, data from each of the 1,000 birds 311 to 31n is transmitted as necessary.

FIG. 4 is for explaining the structure of one of the 1,000 birds shown in FIG. 3.

In FIG. 4, reference numeral 41 denotes a clock generator, and a clock of a constant period generated here is counted by a counter 42. On the other hand, 43 is a random number generator, which is, for example, a storage element in which a random count number is written in advance in a ROM (read-only memory). 44 is a comparator that compares the random number count generated by the random number generator 43 and the counter 4.
2 and generates pulse C only when they match. This pulse C resets the counter 42 and is also sent to the random number generator 43, and is used to set the random number generator 43 to the next random number count.

Reference numeral 46 denotes a detector, and the signal generated by the detector 45 is modulated by a modulator 46 for a time sufficient to transmit data from the time when the pulse C is generated, and is transmitted from an antenna 47.

According to the above configuration, the random number generator 43 is connected to each child device 311 to 3.
By providing each 1n independently, the probability that multiple 1,000 birds transmit at the same time is reduced, and even if there are 1,000 birds that transmit at the same time, the next transmission interval will be different, so the next The probability that the transmission will be received by the parent domain 33 increases. In addition, unlike the conventional configuration explained using FIGS. 1 and 2, there is no need to keep the reception state on all the time, and it is only necessary to transmit the required meeting time when specified by a random number, so when not transmitting, the modulation Since the power to unnecessary circuits such as the device 46 can be turned off, power consumption can be reduced.

FIG. 5 is for further explaining the operation of the random number generator 43.

Figure 5 (a) shows the case where the average time interval d is equalized within the range of time intervals d±e, and Figure 5 (b)
shows a case where the time intervals are set to have a Gaussian distribution, for example, with an average time interval f. It is possible to write the random number generator 43 in advance so that the time intervals as shown in FIG.

A second embodiment of the present invention will be described below.

FIG. 6 shows the blog connection of the transmitter in the second embodiment of the present invention. 61 is a noise generator,
This is sliced at an appropriate threshold level by a waveform shaper 62 and shaped into pulses. This is counted by a counter 63 and a signal is sent out for every fixed number of pulses. Every time this signal is sent out, the data from the detector 64 is modulated by the modulator 65 and transmitted from the antenna 66 to the main wing.

According to the above embodiment, the same effects as the embodiment described in FIG. 4 can be obtained.

Note that the above 1. In the second embodiment, only the case where the transmission to the parent feathers is performed using radio waves has been described, but instead of radio waves, light, infrared rays, ultrasonic waves, etc. may be used as a medium.

Effects of the Invention As described above, in the present invention, by using the irregular information generating means independently for each of the 1,000 birds, the transmission intervals for each of the 1,000 birds become independent, and the certainty of simultaneous transmission is reduced. The security system can be configured only by transmitting data from the transmitter, and it can achieve excellent effects with a small size, low power consumption, and high transmission probability.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional anomaly detector, FIG. 2 is a block diagram of a security system as part of a conventional home bus, and FIG. 3 is a block diagram of a security system using a transmitter in one embodiment of the present invention. A block diagram of the system, FIG. 4 is a block diagram of a transmitter in an embodiment of the present invention, and FIG.
The figure is a characteristic diagram showing the characteristics of the main parts of the transmitter, and FIG. 6 is a block diagram of the transmission in another embodiment of the invention.
1... Thousand birds group, 32... Transmitting antenna group, 33... Parent feathers, 34... Receiving antenna, 35... Bus... Line, 41...
Clock generator, 42... Counter, 43...
...Random number generator, 44...-Comparator, 46.
...Detector, 46...Modulator, 47...
...Transmission antenna, 61...Noise generator,
62...Waveform shaper, 63...Counter, 64...Detector, 65...Modulator, 66...Transmission antenna. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Leap 3 Figure 5 (Figure 6)

Claims (3)

[Claims] (1) Irregular information generation means for generating irregular information;
and transmitting means for transmitting only for a certain period of time in accordance with the irregular information generated by the irregular information generating means. (2) The transmitter according to claim 1, wherein the irregular information generating means comprises random number generating means. (3) The transmitter according to claim 1, wherein the irregular information generating means comprises noise generating means.