ALARM SYSTEM
First Claim
1. An alarm system for alarming when a distance from an object is less than a threshold distance, comprising:
- a signal generating circuit adapted to generate a first signal;
a distance detecting circuit adapted to receive the first signal, detect a distance between the object and the alarm system, output a second signal and a third signal according to the distance;
a gate circuit adapted to receive the second signal and the third signal and output a voltage level signal;
a voltage conversion circuit adapted to receive the voltage level signal and convert the voltage level signal to a DC voltage signal;
a distance judging circuit adapted to receive the DC voltage signal and compare the DC voltage signal with a reference voltage signal to output a control signal; and
an alarm circuit adapted to receive the control signal and produce an alarm when the distance between the object and the alarm system is less than the threshold distance.
1 Assignment
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Accused Products
Abstract
An alarm system for emitting an alarm includes a distance detecting circuit, a gate circuit, a voltage conversion circuit, a distance judging circuit and an alarm circuit. The distance detecting circuit receives a first signal, detects a distance between an object and the alarm system, outputs a second signal and a third signal according to the distance. The gate circuit receives the second signal and the third signal and outputs a voltage level signal. The voltage conversion circuit receives the voltage level signal and converts the voltage level signal into a DC voltage signal. The distance judging circuit receives the DC voltage signal and compares the DC voltage signal against a reference voltage signal to output a control signal if necessary. The alarm circuit receives the control signal and produces the alarm when the distance between the object and the alarm system is less than a threshold distance.
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Citations
20 Claims
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1. An alarm system for alarming when a distance from an object is less than a threshold distance, comprising:
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a signal generating circuit adapted to generate a first signal; a distance detecting circuit adapted to receive the first signal, detect a distance between the object and the alarm system, output a second signal and a third signal according to the distance; a gate circuit adapted to receive the second signal and the third signal and output a voltage level signal; a voltage conversion circuit adapted to receive the voltage level signal and convert the voltage level signal to a DC voltage signal; a distance judging circuit adapted to receive the DC voltage signal and compare the DC voltage signal with a reference voltage signal to output a control signal; and an alarm circuit adapted to receive the control signal and produce an alarm when the distance between the object and the alarm system is less than the threshold distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An alarm system for alarming when a distance from an object is less than a threshold distance, comprising:
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a distance detecting circuit adapted to receive a first signal, detect a distance between the object and the alarm system, output a second signal and a third signal according to the distance; a gate circuit adapted to receive the second signal and the third signal and output a voltage level signal; a voltage conversion circuit adapted to receive the voltage level signal and convert the voltage level signal to a DC voltage signal; a distance judging circuit adapted to receive the DC voltage signal and compare the DC voltage signal with a reference voltage signal to output a control signal; and an alarm circuit adapted to receive the control signal and produce an alarm when the distance between the object and the alarm system is less than the threshold distance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification