JPH0263192B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fence collision prevention alarm device. For example, in baseball, when a player moves backwards or forwards in pursuit of a flying ball, he or she may accidentally collide with a fence, resulting in injury. As a result, players were unable to make bold plays due to a psychological sense of danger when catching balls such as outfield fly balls and foul balls, which worsened their chances of catching the ball.

Therefore, this invention detects the approach of the fence by installing a sensor in the fence and emitting an intermittent sound warning with different cycles depending on the approaching distance to players approaching the fence while running. The purpose is to prevent the risk of collision with the fence.

That is, to explain an embodiment of the present invention with reference to the drawings, as shown in FIG. This is a crash prevention alarm device in which a signal processing device B and a speaker C are attached around each phase identification Doppler module A.

In addition, in Figure 1, two sets of combinations are shown, but
The detection area X can be expanded by attaching a required number of sensors to the fence F at similar intervals.

Next, FIG. 2 is a block diagram showing the configuration of the present invention, and the circuit configuration and functions of FIG. 2 will be described in detail below.

That is, phase discriminating Doppler module A
A Gunn diode is used to emit microwaves, and a Doppler signal is extracted from the microwaves reflected from an approaching or receding object.

The phase discrimination Doppler module A is a well-known technology, and it has two homodyne detectors that are mixers for extracting Doppler signals.
It is configured so that the line length of the reflected microwaves to each mixer is changed by approximately 1/4 wavelength.
Each output Doppler wave has a phase difference.

These two Doppler signals with different phases are
Amplified by amplifier 1a and amplifier 1b, respectively, and by bandpass filter 2a and bandpass filter 2b,
Moving objects, such as the running speed of a human (2 m/s to
10 m) is detected and amplified by amplifiers 3a and 3b, and Doppler signals exceeding the threshold are output as rectangular waves by comparators 4a and 4b, respectively, and input to phase discriminator 5.

The phase discriminator 5 is a D flip-flop circuit, and when one system of signals is input as a clock signal and the other system is input as a data signal, when one system of reference signals becomes high level, the other system is input as a clock signal. It determines whether one system is in a leading phase or a lagging phase based on whether it is at a high level or a low level, and determines whether an object (human) is approaching or moving away, and only signals that are approaching. Take out.

Also, one Doppler signal that has passed through the bandpass filter 2b is amplified by an amplifier 1C, detected into DC by a detector 6, and then converted into a DC signal by a voltage-frequency converter 7 and a T flip-flop 8 as the Doppler signal becomes larger. Generates a pulse train with a shorter period. This pulse train is generated by an audio frequency oscillator 9
An intermittent signal having a length corresponding to the pulse width is formed, is amplified by an amplifier 1d, and is transmitted to a speaker c to generate an intermittent sound.

The audio frequency oscillator 9 is provided with an AND gate 10 as a switch circuit, and a signal and a phase discriminator 5 are outputted only when approaching within a certain distance from the fence F by the detector 6 and the comparator 4c.
Therefore, the audio frequency oscillator 9 operates only when both signals are output, which are output only when an object (person) approaches the fence F.

As a result of the above, the intermittent sound is output only when the human approaches the fence F at a running speed, and the period of this intermittent sound becomes shorter as the person approaches the fence F.

Note that by using the Doppler phenomenon, the object (human) within the detection area X will not emit an intermittent sound unless it moves, and will not emit an intermittent sound even if it moves parallel to the fence F.

In addition, by using a phase discrimination module in the Doppler module and a phase discrimination circuit,
An intermittent sound can be emitted only when an object (human) approaches Fuens F, and by providing band filters 2a and 2b for the Doppler signal and setting a threshold for the amplitude of the Doppler wave. It does not work against flying balls, and can only warn approaching objects (humans) with intermittent sounds.

This invention has the above-described configuration and functions, and by forming a fixed detection area Using the Doppler phenomenon caused by microwaves, intermittent sounds with different intervals depending on the approach distance can be heard from a speaker c installed under the fence.

Therefore, when the Fuens collision prevention alarm device of the present invention is installed at the desired position of Fuens F on the baseball field, when Player P approaches Fuens F from a defensive position while running after a fly ball, the approaching distance will decrease. Therefore, the interval between the intermittent sounds becomes shorter, and the approaching distance can be detected based on the interval between the intermittent sounds.

In this way, Player P can hear the approaching state through the intermittent alarm without visually observing the approach to Fuens F, and can concentrate on catching the ball without taking his eyes off the incoming ball, increasing the probability of catching the ball. It is possible to avoid the risk of collision with fences F, and is useful as an alarm device for preventing collisions with fences as well as baseball fields.

[Brief explanation of the drawing]

An embodiment of the present invention is shown, and FIG. 1 is an explanatory view of the device mounted on a fence F, and FIG. 2 is a block diagram showing the circuit configuration. 1a, 1b, 1c, 1d, 3a, 3b...Amplifier, 2a, 2b...Band filter, 4a, 4
b, 4c... Comparator, 5... Phase discriminator, 6...
Detector, 7...Voltage-frequency converter, 8...T flip-flop, 9...Audio frequency oscillator, 1
0...And gate, A...Phase discrimination Doppler module, B...Signal processing device, C...Speaker, X...Detection area, F...Fence, P
……player.

Claims (1)

[Claims] 1. The required range of a moving object is determined from a plurality of microwave phase identification Doppler modules installed on the fence at intervals such that the microwave beams slightly overlap, and two systems of Doppler signals with different phases from the phase identification Doppler modules. two band filters that detect only the speed of each system, and a series of wave detectors that rectify the output signal of one of the band filters and generate intermittent signals of different audible frequencies corresponding to the voltage.
A frequency converter, an audio frequency oscillator circuit, and a phase discriminator that identifies that an object is approaching the fence based on the phase difference between the two systems of band filter signals and activates the audio frequency oscillator. 1. A fence collision prevention alarm device comprising: a built-in signal processing device; and a speaker that converts the intermittent electric signal of the audible frequency into an intermittent sound.