JPH0420151A - Radio equipment - Google Patents

Abstract

PURPOSE:To receive a signal in an excellent way even in an environment with much fading by providing a reference value revision means confirming the presence of a data when a prescribed number of over of data exist from a sampled data number and increasing a criterion reference value for data presence synchronously with an installation switch in a receiver. CONSTITUTION:A receiver R is provided with an installation switch 7 acting like a sensitivity adjustment switch in the case of installation of a transmitter T and the receiver R, a sampling means 9 sampling data pulse for plural number of times for a very shorter period than a data pulse width, a discrimination means 9 confirming it as the presence of data when signals of a prescribed number or over exist in a sampled data number by the sampling means 9, and a reference value revision means confirming the presence of a data when a prescribed number or over of data exist from a sampled data number and increasing a criterion reference value for data presence synchronously with an installation switch 7. Then the criterion reference value is increased to reduce the identification capability apparently thereby causing the same state as that with deteriorated reception sensitivity and the communication is confirmed while a communication area is made narrow. Thus, a signal is received in an excellent way even in an environment with much fading.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless device used in a so-called wireless security system, which uses wireless for signal transmission in a security and disaster prevention monitoring system.

[Prior Art] Section 8 shows a configuration diagram of a wireless security system, in which monitoring signals for crime prevention, disaster prevention, etc. transmitted wirelessly from a transmitter T are received by a receiver R to prevent crime.

Monitors disaster prevention, etc.

In the security system, the identification code of the transmitter T is registered in advance in the receiver R in order to distinguish the transmitter T that transmits sensor information and should be monitored.

FIG. 9 shows a block diagram of the receiver R, which is roughly divided into a receiving section Ra that receives a signal from the transmitter T, and a receiving section Ra that receives a signal from the transmitter T.
It is comprised of an identification display section Rb that registers the identification code of and determines the identification code. The receiving unit Ra includes an antenna 1 that receives a signal from a transmitter T, a front end 3 that high-frequency amplifies the output of the antenna 1 and converts it to a predetermined frequency, and a demodulator 4 that demodulates the output of the front end 3.
and a waveform shaping section 5 that shapes the waveform of the output of the demodulator 4. And, in the front stage of front end 3,
Attenuator (ATT) to operate when installing receiver R
2 are provided. In addition, the identification display section Rb indicates that each transmitter T
a display section 6 that displays the status of the transmitter T; a registration switch 8 that is operated when registering the identification code of the transmitter T; an arithmetic processing M9 that identifies the identification code and sensor information for each transmitter T; It is comprised of a memory 10 for recording data indicating an identification code and a sensor NM. Furthermore, an installation switch 7, which will be described later, is provided.

[Problems to be Solved by the Invention] Here, the installation switch 7 and the attenuator 2 are provided for the following reasons. That is, the installation switch 7 is used to set the receiver R to be in the installed state when the receiver R is installed, in order to provide a margin for the received transmitter signal level with respect to the reception sensitivity of the receiver R during normal transmission. By turning on the attenuator 2, the attenuator 2 operates in synchronization with the attenuator 2, attenuating the input level during installation, and confirming communication.

However, when a signal is input to the front end 3 without applying attenuator 2 when the installation is removed after installation, there is through attenuation of attenuator 2, which reduces the receiving input and degrades the original sensitivity of receiver R. There was a problem.

Further, as shown in FIG. 10, the receiving section Ra and the identification display section Rb of the receiver R are separated! When it is made into a body, there is a problem in that a control line 11 is required. Furthermore, attenuator 2
There was also the problem that the attenuation rate could not be changed arbitrarily.

The present invention has been provided in view of the above-mentioned points, and eliminates the attenuation caused by the attenuator by eliminating the need for an attenuator.The present invention also provides an apparent deterioration in sensitivity during installation, and provides a good signal even in an environment where there is usually a lot of fading. The purpose of this invention is to provide a wireless device that is capable of receiving.

[Means for Solving the Problems] The present invention provides an installation switch that is operated for sensitivity adjustment when installing a transmitter and a receiver, and a data pulse that is sampled multiple times at a sufficiently short cycle compared to the data pulse width. a sampling means, a determining means for determining the existence of data when a predetermined number or more of signals exist from the number of data sampled by the sampling means, and a reference value for determining the existence of the data in synchronization with the installation switch. The receiver is equipped with a reference value changing means for increasing the reference value.

[Function] When installing the transmitter and receiver, the presence of data is determined based on how many signals exist among the plurality of data sampled by the sampling means in synchronization with the installation switch. In this case, by increasing the standard value for the judgment,
The apparent discrimination ability is lowered, the reception sensitivity is reduced, and the communication is confirmed with the communication area narrowed. It also allows for good communication.

[Example 1] Examples of the present invention will be described below with reference to the drawings. 1st
The block diagram of the receiver R is shown in the figure.The overall configuration is almost the same as the conventional one, except for the attenuator. This is what I did.

By the way, Fig. 2 (1) shows the characteristics of pulse width fluctuation in line-of-sight communication. In other words, when the pulse signal output from the transmitter T is restored by the receiver R, the data pulse It is a relationship between the width and the distance between the transmitter T and the receiver R; the longer the distance, the narrower the data pulse width.

Here, if the probability of existence of a data pulse recognized by the arithmetic processing unit 9 is increased, the communication distance will be shortened. This state in which the existence probability is increased deteriorates the discrimination ability and apparently reduces the reception sensitivity of the upper receiver R.

In synchronization with the installation switch 6 that is operated when installing the transmitter T, the presence probability determined by the arithmetic processing section 9 is raised to a certain level, thereby confirming communication with the sensitivity degraded for a certain period of time. , stable communication can be ensured after the installation is removed.

Now, when a data pulse as shown in FIG. 2(b) is received from the transmitter to the receiver, when determining the data in the arithmetic processing unit 9, the period is sufficiently short compared to the data pulse width. (For example, data pulses are sampled at 1/10 cycle). The current standard value is 6
When it is set to 0%, as shown in FIG. 2(b), if the existence of the sampled data is confirmed 6 times out of 10, it is recognized that the data exists.

Furthermore, when the reference value is increased to 70%, in the same figure, since the data has been sampled only six times, it is determined that there is no data. The above existence probability is increased only by a certain period of time in synchronization with the operation of the installation switch 7 (70% to 90%).
%), which reduces the ability to recognize and identify data at the time of installation. That is, when determining the existence of data, the apparent decrease in identification ability is equivalent to a decrease in reception sensitivity, which narrows the communication area. By checking communication in this state,
This allows for good communication even under artificial fading after the installation is released.

Next, when installing one device, the operation when installing the receiver will be explained using the flowchart in FIG. , this arithmetic processing unit 9 initializes a timer that measures the time during which the identification method is changed. After the timer is initialized, the existence probability serving as the criterion is changed to the value α determined from the distance shown in FIG. 2(a).

If the data is identified and received normally in that state,
A notification device 12 such as a display or an external buzzer gives a notification for a time shorter than the timer operation time. During the timer time, the above operation is delayed, and when the timer ends, the installation switch 7 is turned off to cancel the installation mode, and the existence probability returns to the level set in the initialization in the memory 10 and the alert is activated. Move to mode.

Further, when the installation switch 7 is turned off, the notification signal to the notification device 12 such as a buzzer is canceled.

In this way, by confirming communication with a high probability of existence (with the sensitivity of receiver R degraded), it is possible to provide a margin for the received electric field strength during normal times, and the installation switch 7 and calculation This operation is performed by synchronizing the change of the existence probability in the processing unit 9. Note that the sampling means, the determination means, and the reference value changing means are constituted by the arithmetic processing section 9. Furthermore, since the number of times data pulses are sampled by the arithmetic processing section 9 is set on the program, there is a large degree of freedom. Furthermore, since the sensitivity am at the time of installation can be performed on the identification display section Rb side, the receiving section R
Even if the identification display section a and the identification display section Rb are made into separate casings, there is no need for a control line as in the conventional case.

[Example 2] Example 2 is shown in FIG. 4. In the previous example, the reporting device 1
Although the arithmetic processing unit 9 outputs the notification signal for the second notification, in this embodiment, the first notification signal is output from the display unit 6. The method of determining the existence of data by degrading sensitivity is the same as in the previous embodiment, so its explanation will be omitted.

[Embodiment 3] Embodiment 3 is shown in FIG. 5. In this embodiment, the presence of data is determined by degrading the sensitivity of the receiver Ra in addition to the arithmetic processing unit 9 of the identification display ajRb of the receiver R. A functional arithmetic processing section 13 is provided. 6th [! 1 shows a flowchart of the operation of the arithmetic processing section 9 of the identification display section Rb, and FIG. 7 shows a flowchart of the operation of the arithmetic processing section 13 of the reception section Ra. The arithmetic processing section 13 of the receiving section Ra is provided with the function of determining the existence of data by deteriorating the sensitivity shown in the first embodiment, and the operation will be explained below.

When the installation switch 7 is turned on, a signal indicating the installation state is sent to the arithmetic processing section 9. This arithmetic processing section 9 sends data to the arithmetic processing section 13 of the receiving section Ra to inform it of the installation mode. The arithmetic processing section 13 of the receiving section Ra performs the same operation as described above as shown in FIG. 7 by receiving the installation mode signal.

On the other hand, as shown in FIG. 6, the arithmetic processing section 9 of the identification display section Rb checks whether there is data, identifies the content, and displays it on the display section 6.The installation switch 7 is turned off. In this case, the arithmetic processing unit 9 of the receiving unit Ra
A signal indicating that the installation switch 7 is off is sent to the receiver R, and the receiver R shifts to the alert mode. At 1ii1, the arithmetic processing section 13 of the receiving section Ra receives a signal indicating that the installation switch 7 is off, and shifts to the alert mode.

In each of the above embodiments, the operations of the arithmetic processing units 9 and 12 are synchronized with the installation switch 7 to determine the existence of data, but the same operation is performed in synchronization with the operation of the registration switch 8. You can do it like this.

[Effects of the Invention] As described above, the present invention includes an installation switch that is operated for sensitivity adjustment when installing a transmitter and a receiver, and a data pulse that is sampled multiple times at a sufficiently short cycle compared to the data pulse width. a sampling means, a determining means for determining the existence of data when a predetermined number or more of signals are present from the number of data sampled by the sampling means, and a reference value for determining the existence of the data in synchronization with the installation switch. Since the receiver is equipped with a reference value changing means to increase the reference value, when installing the transmitter and receiver, it is possible to determine how many signals out of the plurality of data sampled by the sampling means in synchronization with the installation switch. When determining the existence of data based on whether it exists, increasing the standard value for that judgment will improve the
By lowering the apparent identification ability and reducing the reception sensitivity, we checked the communication with the communication area narrowed, and in an environment with a lot of fading in the communication after the installation was removed. It is effective for good communication even in
In addition, by setting the number of samplings mentioned above, for example, in a program, the degree of freedom can be increased.Furthermore, unlike conventional methods, sensitivity can be adjusted without using an attenuator. This has the effect that the inherent sensitivity of the receiver is not degraded due to this.

[Brief explanation of drawings]

FIG. 1 is a block port of a receiver according to an embodiment of the present invention, FIGS. 2(a) and 2(b) are explanatory diagrams of the same as above, FIG. 3 is a flowchart of the same as above, and FIG. 4 is a block of a second embodiment of the same as above. Fig. 5 is a block diagram of the third embodiment of the above, Fig. 6 is a flowchart of the arithmetic processing section of the identification display section of the above, Fig. 7 is a flowchart of the arithmetic processing section of the receiving section of the above, and Fig. 8 is a flowchart of the arithmetic processing section of the receiving section of the above. System configuration diagram, Figure 9 is a block diagram of a conventional receiver, Figure 10 is a block diagram of a conventional receiver.
The figure is an explanatory diagram same as the above. 7 is an installation switch, T is a transmitter, and R is a receiver. Agent Patent Attorney Ishi 1) Chief 7 Figure 2 (b) Figure 3 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] (1) In a wireless device consisting of a transmitter that sends out a predetermined data pulse and a receiver that receives the data pulse from the transmitter and demodulates the data signal, the sensitivity is an installation switch that is operated for adjustment; a sampling means that samples the data pulse multiple times at a sufficiently short cycle compared to the data pulse width;
Judgment means that determines the presence of data when a predetermined number or more of signals exist from the number of data sampled by the sampling means, and a reference value change that increases the reference value for determining the presence of data in synchronization with the installed switch. What is claimed is: 1. A wireless device characterized in that a receiver is provided with means.