Method and apparatus for detecting and locating noise sources whether correlated or not
First Claim
1. A method of detecting and locating noise sources each emitting a respective signal Sj with j=1 to M, detection being provided by means of acoustic wave or vibration sensors each delivering a respective time-varying electrical signal si with i lying in the range 1 to N, the method comprising:
- taking the time-varying electrical signals delivered by the sensors, each signal si(t) delivered by a sensor being the sum of the signals Sj emitted by the noise sources;
amplifying and filtering the time-varying electrical signals as taken;
digitizing the electrical signals;
calculating the functional f, such that;
with <
.,.>
being the scalar product;
ci being the vector constructed between the center of gravity of the sensors and the position of sensor i;
nj being the unit vector in the direction defined by the center of gravity of the senors and source j;
with T0=s; and
with c=the speed of sound; and
in minimizing the functional f relative to the vectors nj for j=1 to M in such a manner as to determine the directions nj of the noise sources, wherein ω
is angular frequency,<
Tk(ω
), Ti*(ω
)>
is the scalar product between Tk(ω
), and Tl*(ω
),J corresponds to the imaginary number in mathematics.
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Accused Products
Abstract
A method of detecting and locating noise sources each emitting respective signals Sj with j=1 to M, detection being provided by a sound wave or vibration sensors each delivering a respective time-varying electrical signal si with i in the range 1 to N, wherein the method steps include: (a) taking the time-varying electrical signals delivered by the sensors, each signal si(t) delivered by a sensor being the sum of the signals Sj emitted by the noise sources; (b) amplifying and filtering the time-varying electrical signals as taken; (c) digitizing the electrical signals; (d) calculating a functional; and (e) minimizing the functional relative to the vectors nj for j=1 to M so as to determine the directions of vector nj of the noise sources.
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Citations
5 Claims
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1. A method of detecting and locating noise sources each emitting a respective signal Sj with j=1 to M, detection being provided by means of acoustic wave or vibration sensors each delivering a respective time-varying electrical signal si with i lying in the range 1 to N, the method comprising:
-
taking the time-varying electrical signals delivered by the sensors, each signal si(t) delivered by a sensor being the sum of the signals Sj emitted by the noise sources; amplifying and filtering the time-varying electrical signals as taken; digitizing the electrical signals; calculating the functional f, such that;
with<
.,.>
being the scalar product;ci being the vector constructed between the center of gravity of the sensors and the position of sensor i; nj being the unit vector in the direction defined by the center of gravity of the senors and source j; with T0=s; and with c=the speed of sound; and in minimizing the functional f relative to the vectors nj for j=1 to M in such a manner as to determine the directions nj of the noise sources, wherein ω
is angular frequency,<
Tk(ω
), Ti*(ω
)>
is the scalar product between Tk(ω
), and Tl*(ω
),J corresponds to the imaginary number in mathematics. - View Dependent Claims (2, 3, 4, 5)
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Specification