发明名称 |
Shaped modulation audible alarm |
摘要 |
A method and apparatus for providing an audible alarm signal. The method and apparatus includes creating a rectangular pulse signal having a desired period and a desired first amplitude, adding a shaped modulation component to the rectangular pulse signal from the desired first amplitude to a desired second amplitude to create a modulating waveform, creating a carrier signal, and combining the carrier signal and the modulating waveform to create the audible alarm signal.
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申请公布号 |
US2005280513(A1) |
申请公布日期 |
2005.12.22 |
申请号 |
US20040873875 |
申请日期 |
2004.06.22 |
申请人 |
MCDANIEL MICHAEL S;COPLEY DAVID C;ZIMMERMANN DANIEL E |
发明人 |
MCDANIEL MICHAEL S.;COPLEY DAVID C.;ZIMMERMANN DANIEL E. |
分类号 |
G08B3/10;(IPC1-7):G08B3/10 |
主分类号 |
G08B3/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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