Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-11-22
1981-12-22
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
73697, 340573, G08B 2100
Patent
active
043073859
ABSTRACT:
An apparatus for monitoring the noise which impinges a human ear and for generating a signal representing the noise level accumulated over a period of time. Typically, the apparatus can be located in a hearing protector worn by a worker in a noisy environment. A microphone generates a signal having a magnitude representing the detected noise level of the ear which signal is processed by an absolute value circuit and a root mean square circuit to generate a signal having a magnitude proportional to the logarithm of the detected noise level. This logarithmic signal is converted by a voltage to frequency converter and a counter accumulates a count total proportional to the noise level over a period of time. The apparatus includes visual and aural alarms to indicate a maximum allowed noise level and dosage. The apparatus can also be inserted into a storage unit for reading the data, calibrating the noise monitor circuitry and recharging the batteries in the apparatus.
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Savich, Miron, "Noise Monitor Hat", Sound and Vibration, Jan., 1976, p. 8.
Evans Sue A.
Rogers Clarence L.
Evans Sue Ann
Swann III Glen R.
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