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公开(公告)号:US4003264A
公开(公告)日:1977-01-18
申请号:US624446
申请日:1975-10-21
申请人: Bengt Erlandsson , Hakan Hakansson , Bengt Salen , Per Nilsson , Alf Ivarsson
发明人: Bengt Erlandsson , Hakan Hakansson , Bengt Salen , Per Nilsson , Alf Ivarsson
IPC分类号: G01H3/00 , G01D20060101 , G01H3/14 , G10K11/00 , G01H3/12
CPC分类号: G01H3/14
摘要: 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.
摘要翻译: 示出了用于在给定时间间隔期间检测并记录声音高于指定预定水平的装置。 电路包括麦克风,滤波器,放大器,电平检测器,发光二极管和感光材料。