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1. 发明授权

US5796336A Glass breakage detecting device 失效
标题翻译：玻璃破损检测装置
公开(公告)号：US5796336A
公开(公告)日：1998-08-18
申请号：US813659
申请日：1997-03-07
申请人： Hirotugu Ishino , Akira Kurahashi
发明人： Hirotugu Ishino , Akira Kurahashi
IPC分类号： G01H17/00 , G08B13/04 , G08B13/00
CPC分类号： G08B13/04
摘要： To improve accuracy in detection of glass breakage, a microphone converts a glass breaking sound into an electrical signal, and high-pass filters and extract high frequency components of 2 kHz or higher and 150 Hz or higher, respectively, from the signal. A half-wave rectifier circuit half-wave rectifies these signals and an amplifier amplifies them. The output of the amplifier is smoothed by smoothing circuits. When the output of the smoothing circuit reaches a predetermined value, a trigger circuit outputs a start pulse to a start terminal of a CPU. Started by the start pulse, the CPU inputs the outputs of the smoothing circuits, converts them into digital values using an A/D converter, determines integrals over 30 ms, and stores the integrals into a RAM. Then, the CPU calculates a ratio of the integral of the output of the smoothing circuit to the integral of the output of the smoothing circuit based on a program stored in a ROM. If the ratio is within a predetermined range, the CPU determines that the detected acoustic waves are the first waves of a glass breaking sound and outputs a glass breakage detection signal.
摘要翻译：为了提高玻璃破损检测的准确性，麦克风将玻璃破碎声音转换为电信号，并将高通滤波器分别从信号中提取2kHz或更高和150Hz或更高的高频分量。半波整流电路对这些信号进行半波整流，放大放大器。放大器的输出由平滑电路平滑。当平滑电路的输出达到预定值时，触发电路将起始脉冲输出到CPU的起始端。由起始脉冲开始，CPU输入平滑电路的输出，使用A / D转换器将其转换为数字值，确定超过30 ms的积分，并将积分存储到RAM中。然后，CPU基于存储在ROM中的程序，计算平滑电路的输出的积分与平滑电路的输出的积分的比率。如果比率在预定范围内，则CPU确定检测到的声波是玻璃破裂声的第一波，并输出玻璃破损检测信号。

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