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An active sound or vibration control system for compensating noise or vibration arising from a periodic source of changing periodicity, wherein sensors (6) sense the existing noise and vibration, the sensor signals are sampled several times per cycle by an ADC (8) triggered by a signal output from a...

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Bibliographische Detailangaben
Hauptverfasser:	DORLING, CHRISTOPHER, MARK, CAMBRIDGE CB4 2QR, GB, HODSON, WILLIAM, RICHARD, CAMBRIDGE CB1 3QE, GB, EATWELL, GRAHAM, PAUL, CAMBRIDGE CB3 7NZ, GB
Format:	Patent
Sprache:	ger
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR BLASTING CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING ENGINE PLANTS IN GENERAL ENGINEERING ELEMENTS AND UNITS FUNCTIONAL ELEMENTS OF SUCH SYSTEMS GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MEANS FOR DAMPING VIBRATION MECHANICAL ENGINEERING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS MUSICAL INSTRUMENTS PHYSICS REGULATING SHOCK-ABSORBERS SOUND-PRODUCING DEVICES SPRINGS STEAM ENGINES SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	An active sound or vibration control system for compensating noise or vibration arising from a periodic source of changing periodicity, wherein sensors (6) sense the existing noise and vibration, the sensor signals are sampled several times per cycle by an ADC (8) triggered by a signal output from a sensor (3) detecting the position of the source in its cycle, the sampled signals are transformed into compensation actuator drive signal values by a series of transform and adaptation modules (11 to 13, 15) based on algorithms dependent on the frequency of the source, and the drive signal values are stored in a memory means (1) continually updated by the values derived from the sampled sensor signals.