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, in particular an exhaust duct,said method comprising the steps of:
- injecting, via an acoustic-wave diffuser, into a secondary propagation path that merges in said primary path, second acoustic waves (MW), which are able to 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 diffuser 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; and
calculating equalization coefficients (α
i, . . . , α
m) to be applied to the amplitudes of said harmonics of said driving signal (SP) via a self-tuning procedure, which comprises comparing said reference acoustic waves (TW) with a simulation (SRW) of said resulting waves (RW), said simulation (SRW) being obtained by applying, to a simulation (MSW) of the second injected acoustic waves (MW), a model (H) of the secondary propagation path.
1 Assignment
0 Petitions
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.
-
Citations
12 Claims
-
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, in particular an exhaust duct,
said method comprising the steps of: -
injecting, via an acoustic-wave diffuser, into a secondary propagation path that merges in said primary path, second acoustic waves (MW), which are able to 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 diffuser 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; and calculating equalization coefficients (α
i, . . . , α
m) to be applied to the amplitudes of said harmonics of said driving signal (SP) via a self-tuning procedure, which comprises comparing said reference acoustic waves (TW) with a simulation (SRW) of said resulting waves (RW), said simulation (SRW) being obtained by applying, to a simulation (MSW) of the second injected acoustic waves (MW), a model (H) of the secondary propagation path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
- 9. 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, in particular an exhaust duct, said system comprising a secondary path, which merges in said primary path, in which an acoustic-wave diffuser injects second acoustic waves (MW), which are able to combine with said first acoustic waves (EW) in a merge point in said primary propagation path and to generate third resulting acoustic waves (RW), an active-sound-profiling unit configured for generating a driving signal (SP) for said diffuser 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 active-sound-profiling unit acting to carry out said operation of regulation.
Specification