Vehicle active noise cancellation system diagnostic tool
AssigneeHarman International Industries, Incorporated
InventorsGeon-Seok Kim, Michael Hinz, Dylan Michael Stafford, Ismael Mendoza
Life of this patent
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Abstract
Embodiments of a diagnostic tool for an active noise cancelling system are presented. The diagnostic tool may generate an output from the active noise cancelling system and capture input to the active noise cancelling system that results from the output of the active noise cancelling system. The diagnostic tool may generate visual output to aid in evaluation of active noise cancelling systems.
Claims14
A diagnostic tool for an active noise cancelling system, comprising:
- a controller including executable instructions stored in non-transitory memory that cause the controller to initiate an impulse response diagnostic for the active noise cancelling system, where the impulse response diagnostic includes:
- performing a cross-correlation between a reference impulse response and an impulse response of the active noise cancelling;
- generating a correlation coefficient based on the reference impulse response and the impulse response of the active noise cancelling system;
- and
- generating an indication of degradation of the active noise cancelling system according to a value of the correlation coefficient, where the indication of degradation is an indication of a speaker wired with an inverse electric polarity.
An active noise cancelling system diagnostic method, comprising:
- supplying a broadband signal to a speaker of an active noise cancelling system;
- sensing audible output of the speaker responding to the broadband signal via a microphone;
- and
- performing cross-correlation analysis on an impulse response generated from a signal output from the microphone sensing the audible output of the speaker, where the impulse response is generated by dividing the signal output from the microphone by the broadband signal, and where the active noise cancelling system is performed at an end of a vehicle assembly line after the speaker and the microphone have been installed in the vehicle, and where performing the cross-correlation analysis includes performing a cross-correlation based on a reference impulse response and the impulse response generated from the signal output from the microphone;
- and
- displaying the correlation coefficient via a human/machine interface.
An end of an assembly line diagnostic tool for an active noise cancelling system, comprising:
- a controller including executable instructions stored in non-transitory memory of a vehicle being assembled on the assembly line that cause the controller to initiate an impulse response diagnostic for the active noise cancelling system while the vehicle is positioned at the end of the assembly line, where the impulse response diagnostic includes generating correlation coefficients for a plurality of microphones and accelerometers, and generating an output on a display in response to the generated correlation coefficients.
Dependencies are inferred from the claim text.