Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-05-28
2000-12-19
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
367135, 381 711, 381317, 381 56, 381 941, G08B 2100
Patent
active
061632678
ABSTRACT:
The invention relates to a device for measuring noise comprising a sensor circuit having at least two sensors, an ambient noise eliminating circuit and a signal processing circuit. All the sensors are set to detect the ambient or background noise, however the source noise is positioned for detection by one of the sensors. The output of the sensor circuit is connected to the input of the ambient noise eliminating circuit where the ambient noise is eliminated from the noise signal leaving only a signal of the noise source. The signal processing circuit receives the signal of the measured noise, which is rectified and amplified, and then processed in the comparator circuit to determine whether the noise level is acceptable or not. The result is displayed through the display circuit comprising a plurality of LEDs.
REFERENCES:
patent: H417 (1988-01-01), Miles
patent: 4233600 (1980-11-01), Rogers et al.
patent: 4456795 (1984-06-01), Saito
patent: 5473315 (1995-12-01), Holroyd
Devon Marcia
Lee Benjamin C.
Sunonwealth Electric Machine Industry Co. Ltd.
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