Vehicle engine sound management

1. 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 harmonics to be within a predetermined threshold with respect to a plurality of target harmonics corresponding to a desired sound, wherein the harmonic modifier device determines the target harmonics for the extracted harmonics of the received signal indicative of rotating speed of the sound generating source, wherein the harmonic modifier device further generates an individual gain adjustment for each extracted harmonic from a target value of the plurality of target harmonics, wherein the harmonic modifier device generates an adjusted harmonic signal from each individual gain adjustment and extracted harmonic signal, and wherein the adjusted harmonic signals are electronically summed to generate the desired sound.

2. The active sound management system of claim 1 , wherein the harmonic extractor device comprises:

a reference frequency calculator that receives the signal indicative of the rotating speed of the sound generating source, and determines from the signal a fundamental frequency of the harmonics of the sound generating source; and

a harmonic decomposer that multiplies the fundamental frequency of the harmonics by an order of each harmonic for calculating harmonic frequencies, and extracts the harmonics from the signal generated by the transducer.

3. The active sound management system of claim 1 , wherein the sound generating source includes a vehicle engine.

4. The active sound management system of claim 1 , wherein the harmonic modifier device comprises:

a target calculator that generates the plurality of target harmonics related to a fundamental frequency of an input signal;

an envelope detector that generates from the extracted harmonic signals a plurality of estimate values that provide an estimated envelope of the corresponding harmonic signals;

a gain calculator that processes the estimate values and the target harmonics for determining the 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.

5. The active sound management system of claim 4 wherein the estimated envelope is provided from a smoothing process over a window of time.