Emery L Bess

55963110, Jan 21, 1997

May 23, 1995

8/447715

Emery L. Bess - Nampa ID
Harry S. Erskine - Boise ID

Preco, Inc. - Boise ID

G08B 310

3403847

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.

6014596, Jan 11, 2000

Feb 26, 1998

9/031086

Emery L. Bess - Nampa ID
Dale C. Hessing - Boise ID
David Durlin - Meridian ID

Presco, Inc. - Boise ID

B60Q 100
G06F 1700

701 1

An intelligent strobe system for vehicle applications includes strobe modules connected between the positive and negative DC power rails of the vehicle. One of the strobe modules includes a transmitter circuit for generating sinusoidal data and transmitting the data over the DC power rails. Other strobe modules include a receiver circuit to receive and decode the sinusoidal data to control the flash sequence.