Shaped modulation audible alarm

Details Shaped modulation audible alarm Shaped modulation audible alarm

2007-09-11

2007-09-11

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Audible indication

Simulation

C340S435000, C340S460000, C381S057000, C381S107000

Reexamination Certificate

active

10873875

ABSTRACT:
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.

REFERENCES:
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patent: 3943507 (1976-03-01), Neal et al.
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patent: 5596311 (1997-01-01), Bess et al.
patent: 6360187 (2002-03-01), Hermann
patent: 6404338 (2002-06-01), Koslar
SAE J994, Surface Vehicle Standard, Issued Jul. 1967 (Revised Aug. 1993).
CAA Paper 82017, Guidelines for Auditory Warning Systems on Civil Aircraft, Roy D. Patterson, Nov. 1982 (Reprinted Aug. 1985).

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