Method for performing an active profiling of a sound emitted by an engine and corresponding profiling system
First Claim
1. A method for performing an active profiling of the sound emitted by a vehicle engine that issues first acoustic waves (EW) along a primary path of propagation of acoustic waves,said method comprising the steps of:
- injecting second acoustic waves (MW) via an acoustic-wave speaker, into a secondary propagation path that merges in said primary path, wherein said second acoustic waves (MW) combine with said first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW);
generating a driving signal (SP) for driving said speaker by regulating the amplitude of harmonics of said driving signal (SP) as a function of reference acoustic waves (TW) of a reference vehicle and of a workpoint (WP) of the engine;
calculating respective equalization coefficients (α
1, . . . , α
M) to be applied to the corresponding amplitudes of said harmonics of said driving signal (SP) via a self-tuning procedure, which comprises comparing said reference acoustic waves (TW) of a reference vehicle with a simulation (SRW) of said resulting waves (RW), said simulation (SRW) being obtained by applying a model (H) of the secondary propagation path to a simulation (MSW) of the second injected acoustic waves (MW);
generating basic harmonics (W1, . . . , WM) as a function of the current workpoint (WP) of the engine;
obtaining said equalization coefficients (α
1, . . . , α
M) as a function of the values of workpoint (WP);
obtaining equalized harmonics (EW1, . . . , EWM) as a function of said equalization coefficients (α
1, . . . , α
M);
adding together said equalized harmonics (EW1, . . . , EWM) to obtain a digital driving wave (DW); and
converting said digital driving wave (DW) into an analog signal corresponding to the driving signal (SP).
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Accused Products
Abstract
A method for performing an active profiling of the sound emitted by a vehicle engine including the steps of injecting second acoustic waves (MW), which are able to combine with the first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW); and generating a driving signal for the diffuser by regulating the amplitude of harmonics of the driving signal (SP) as a function of reference acoustic waves and of a workpoint of the engine, calculating equalization coefficients (α1, . . . , αM) to be applied to the amplitudes of said harmonics of the driving signal (SP) via a self-tuning procedure, and comparing the reference acoustic waves (TW) with a simulation (SRW) of the resulting waves. The simulation (SRW) is obtained by applying to a simulation of the second acoustic waves a model of the secondary propagation path.
15 Citations
9 Claims
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1. A method for performing an active profiling of the sound emitted by a vehicle engine that issues first acoustic waves (EW) along a primary path of propagation of acoustic waves,
said method comprising the steps of: -
injecting second acoustic waves (MW) via an acoustic-wave speaker, into a secondary propagation path that merges in said primary path, wherein said second acoustic waves (MW) combine with said first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW); generating a driving signal (SP) for driving said speaker by regulating the amplitude of harmonics of said driving signal (SP) as a function of reference acoustic waves (TW) of a reference vehicle and of a workpoint (WP) of the engine; calculating respective equalization coefficients (α
1, . . . , α
M) to be applied to the corresponding amplitudes of said harmonics of said driving signal (SP) via a self-tuning procedure, which comprises comparing said reference acoustic waves (TW) of a reference vehicle with a simulation (SRW) of said resulting waves (RW), said simulation (SRW) being obtained by applying a model (H) of the secondary propagation path to a simulation (MSW) of the second injected acoustic waves (MW);generating basic harmonics (W1, . . . , WM) as a function of the current workpoint (WP) of the engine; obtaining said equalization coefficients (α
1, . . . , α
M) as a function of the values of workpoint (WP);obtaining equalized harmonics (EW1, . . . , EWM) as a function of said equalization coefficients (α
1, . . . , α
M);adding together said equalized harmonics (EW1, . . . , EWM) to obtain a digital driving wave (DW); and converting said digital driving wave (DW) into an analog signal corresponding to the driving signal (SP). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for active profiling of the sound emitted by a vehicle engine that issues first acoustic waves (EW) along a primary path of propagation of acoustic waves, said system comprising a secondary path, which merges in said primary path of propagation, in which an acoustic-wave speaker injects second acoustic waves (MW), which combine with said first acoustic waves (EW) in a merge point in said primary path of propagation and to generate third resulting acoustic waves (RW), an active-sound-profiling unit that generates a driving signal (SP) for said speaker by regulating the amplitude of harmonics of said driving signal (SP) as a function of reference acoustic waves (TW) and of a workpoint (WP) of the engine, said system acting to carry out on one or more processors including:
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calculating respective equalization coefficients (α
1, . . . , α
M) to be applied to the corresponding amplitudes of said harmonics of said driving signal (SP) via a self-tuning procedure, which comprises comparing said reference acoustic waves (TW) of a reference vehicle with a simulation (SRW) of said resulting waves (RW), said simulation (SRW) being obtained by applying a model (H) of the secondary propagation path to a simulation (MSW) of the second injected acoustic waves (MW);generating basic harmonics (W1, . . . , WM) as a function of the current workpoint (WP) of the engine; obtaining said equalization coefficients (α
1, . . . , α
M) as a function of the values of workpoint (WP);obtaining equalized harmonics (EW1, . . . , EWM) as a function of said equalization coefficients (α
1, . . . , α
M);adding together said equalized harmonics (EW1, . . . , EWM) to obtain a digital driving wave (DW); and converting said digital driving wave (DW) into an analog signal corresponding to the driving signal (SP). - View Dependent Claims (8, 9)
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Specification