JPH0263191B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm device for preventing collision with fences. For example, in baseball, when a player moves backwards or forwards in pursuit of a flying ball, he or she accidentally collides with fences, 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, leading to poor ball catch probability.

Therefore, this invention has a built-in sensor in the fence, and detects the approach of the fence by emitting different warnings depending on the approaching distance to players approaching the fence while running.
The purpose of this is to prevent the danger of colliding with the fence, and to detect the approaching distance with a warning so that the ball can be caught while ensuring safety.

That is, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. This is a fence collision prevention alarm device that is installed on the surface of a fence F, and has a signal processing device B and a speaker C installed around the phase identification Doppler module. Although two sets of configurations are shown in FIG. 1, the detection area X can be expanded by attaching the required number to the fence F at similar intervals.

FIG. 2 is a block diagram showing the configuration of the present invention, and the circuit configuration and functions of the present invention will be described in detail with reference to FIG. 2 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 identification Doppler module A is a well-known technology, and it has two homodyne detectors that are mixers for extracting Doppler signals, and the line length of the reflected microwaves to each mixer is approximately 1. It is configured to change the wavelength by /4, and each output Doppler signal has a phase difference. These two Doppler signals with different phases are amplified by amplifiers 1a and 1b, respectively, and bandpass filters 2a and 2b are used to detect Doppler signals from moving objects such as the running speed of a human (approximately 2 m to 10 m/s). Only the signal 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 signals serving as a reference becomes high level, the other system's signal is input as a clock signal. Depending on whether one system is at a high level or a low level, it is determined whether it is in an advanced phase or a delayed phase, and based on this, it is determined whether an object (human) is approaching or going away. Extracts only the signal that comes from the source.

Also, one line of Doppler signal that has passed through the band filter 2b is amplified by an amplifier 1c, converted to an audible frequency by a frequency multiplier 6, and then transmitted to an amplifier 3.
After being amplified by c, the sound is produced by speaker c.

The frequency multiplier 6 is equipped with an electronic switch 7, which is activated only when the phase discriminator 5 determines that it is a Doppler signal during approach. is applicable.

As a result of the above, the alarm is sounded only when a person approaches Fuens F at the running speed, and the alarm gets louder as the person approaches Fuens F, and the higher the speed, the higher the sound, and the closer the distance,
The approaching speed can be accurately determined by the warning.

Furthermore, by using the Doppler phenomenon,
Unless the object (human) within the detection area X moves toward or away from the fence F, no alarm will be issued. In addition, by using a phase discrimination module in the Doppler module and using it together with a phase discrimination circuit, an object (human) can be
By installing a band filter for the Doppler signal, a warning is issued only when the object approaches the target, and a bandpass filter is installed for the Doppler signal. ) can be set to issue an alarm only when approaching.

This invention has the configuration and function described above, and by forming a fixed detection area X from the fence F using microwaves, when approaching the fence F within this detection area, the This system utilizes the Doppler phenomenon caused by microwaves reflected depending on the distance and running speed of the vehicle, and converts the Doppler signal into an audible frequency to generate warnings with different loudnesses and pitches. .

Therefore, when the fence collision prevention alarm device of the present invention is installed at a desired position on the baseball field fence, when player P approaches fence F while running chasing a fly ball, the frequency of the Doppler wave will decrease as the approaching distance approaches. As the amplitude of the Doppler wave increases, the alarm becomes louder, and as the approach speed increases, the frequency of the Doppler wave becomes higher and the alarm sound becomes louder.

In this way, Player P can hear the approaching status of Fuens F without having to visually see the approach, so he can concentrate on catching the ball without taking his eyes off the incoming ball, which improves the probability of catching the ball. It is possible to avoid the danger 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 drawings]

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, 3a, 3b, 3c...Amplifier, 2a, 2b...Band filter, 4a, 4b
... Comparator, 5 ... Phase discriminator, 6 ... Frequency multiplier, 7 ... Electronic switch, A ... Phase discrimination Doppler module, B ... Signal processing device, C ...
...Speaker, F...Fence, X...Detection area, 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, a frequency multiplier that multiplies the output signal of one of the band filters and converts it to an audible frequency, and a phase difference between the two band filter signals to determine whether the object is a fence. a signal processing device that includes a built-in phase discriminator that recognizes that the device is approaching the frequency multiplier and activates the frequency multiplier; and a speaker that converts the electrical signal of the audible frequency into sound. Fuens collision prevention alarm device.