Method of generating a drive signal for a loudspeaker arranged in a motor vehicle, an exhaust system for an engine and a sound system for a passenger cell
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United States of America Patent
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Jun 5, 2018
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app pub date -
Jan 12, 2017
filing date -
Jan 14, 2016
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Abstract
A method of generating a drive signal for a loudspeaker in an exhaust system of an engine of a vehicle or inside or outside a passenger cell includes providing a predetermined source signal for a desired additional sound in a time domain comprising a plurality of signal components of different frequencies; analyzing the source signal based on a phase of the source signal and/or a phase of at least one oscillation in the source signal; identifying a phase of engine noise and/or a phase of at least one oscillation existing in engine noise; shifting the phases of the source signal and/or the oscillation existing in the source signal based on phases identified in engine noise and/or in oscillation existing in engine noise, the relationship of phases of individual oscillations of the source signal among each other being preserved; and generating the drive signal based on the phase-shifted source signal.
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