Vehicle engine sound management
AssigneeBose Corporation
InventorsCristian M. Hera, Peter Raymond, Samuel Rhee
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Abstract
An active sound management system comprises a transducer that senses an actual sound or vibration from a sound generating source and generates a transducer signal in response to sensing the actual sound or vibration; a harmonic extractor device that extracts a plurality of harmonics from the transducer signal; and a harmonic modifier device that adjusts a feature of the extracted harmonic to be within a predetermined threshold with respect to a target harmonic corresponding to a desired sound.
Claims13
An active sound management system, comprising:
- a transducer that senses an actual sound or vibration from a sound generating source and generates a transducer signal in response to sensing the actual sound or vibration;
- a harmonic extractor device that extracts a plurality of harmonics from the transducer signal;
- and
- a harmonic modifier device that adjusts a feature of the extracted harmonic to be within a predetermined threshold with respect to a target harmonic corresponding to a desired sound, wherein the harmonic modifier device comprises a target calculator that generates a plurality of target harmonics related to a fundamental frequency of an input signal;
- wherein the target calculator comprises a load processor that converts a torque measurement in the input signal representative of a vehicle state parameter received by the target calculator to an engine load measurement, and determines a harmonic magnitude and phase as a function of RPM data and engine load data provided in the input signal.
A harmonic modifier device, comprising:
- a target calculator that generates a plurality of target harmonics related to a fundamental frequency of an input signal;
- an envelope detector that generates from a plurality of harmonic signals extracted from an engine sound a plurality of estimate values that provide an estimated envelope of the corresponding harmonic signals, from a smoothing process over a window of time;
- a gain calculator that processes the estimate values and the target harmonics for determining individual gain adjustments for the extracted harmonic signals;
- and
- a plurality of gain devices that generate adjusted harmonic signals from the gain adjustments and the extracted harmonic signals.
A vehicle engine harmonic signal enhancement system, comprising:
- a device that provides a fundamental frequency corresponding to an revolutions per minute (RPM) of a vehicle engine;
- a transducer that generates a signal in response to sensing an output from the vehicle engine;
- a harmonic extractor device that extracts the individual harmonics from the transducer signal;
- a comparator that compares each extracted harmonic with a target harmonic corresponding to a desired engine sound heard in a vehicle cabin proximal the vehicle engine;
- and
- a harmonic modifier device that adjusts a feature of the extracted harmonic to be within a threshold with respect to the target harmonic.
Dependencies are inferred from the claim text.