Communications: electrical – Audible indication – Electronic
Patent
1995-05-23
1997-01-21
Hofsass, Jeffery
Communications: electrical
Audible indication
Electronic
3403884, 3403923, 3403982, 3403925, 331116R, 331154, 331155, 381 96, G08B 310
Patent
active
055963110
ABSTRACT:
A method and system employing a feedback signal indicative of monitored motion of an electro-mechanical acoustic transducer to generate one or both of a control signal for driving the transducer at its natural resonance frequency, and a warning signal indicating that the transducer is not vibrating at a frequency within a selected frequency range. In preferred embodiments, the transducer is a voice coil loudspeaker mounted in or on a vehicle. In other preferred embodiments, the electro-mechanical transducer is driven by an initial electrical pulse followed by a sequence of electrical pulses. A feedback signal indicative of monitored motion of a moving portion of the transducer is generated. Each pulse (following the initial pulse) is applied at a time (determined by the feedback signal) so as to drive the transducer at its actual natural resonance frequency. Some embodiments monitor the peak velocity (rather than displacement) of a driven electro-mechanical transducer, process the monitored peak velocity signal to generate feedback indicative of actual radiated energy from the transducer, and generate from the feedback signal one or both of a control signal for driving the transducer in a desired manner and a warning signal indicating that the transducer has not radiated a selected minimum amount of energy.
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Bess Emery L.
Erskine Harry S.
Hofsass Jeffery
Pope Daryl C.
Preco Inc.
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