Patent · US Expired

Device for measuring and registering of sound

US4003264A · kind A · utility

6Cited by

2References

6Claims

0Family size

Assignee

Shine Patent AB

Inventors

Bengt Erlandsson
Hakan Hakansson · Lund, SE
Bengt Salen
Per Nilsson · Ljungsbro, SE
Alf Ivarsson

Key dates

Filing date	Oct 21, 1975
Grant date	Jan 18, 1977
Priority date	—
Expiry date	Oct 21, 1995

Classification

Technology area (CPC G)Physics
CPC primaryG01H3/14
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A device is shown for detecting and recording the presence of sound above specified predetermined levels during given time intervals. The circuit includes a microphone, a filter, an amplifier, level detectors, light emitting diodes and a photosensitive material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.