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US 10,373,602 B2Granted
Active noise cancellation
AssigneeHarman Becker Automotive Systems GmbH
InventorNikos Zafeiropoulos
Life of this patent
Estimating the term…
Abstract
An active noise cancellation system and method, in which an active noise controller generates an anti-noise signal based on an error signal, and a loudspeaker operatively coupled to the active noise controller converts the anti-noise signal into anti-noise sound. An acoustic error sensor operatively coupled to the active noise controller picks up sound and converts the picked-up sound into the error signal. The acoustic error sensor is disposed at a front face of the loudspeaker.
Claims13
A system comprising:
- an active noise controller configured to generate an anti-noise signal based on an error signal;
- one or more reference sensors operatively coupled to the active noise controller and configured to provide one or more reference signals that characterize at least one noise source;
- a loudspeaker mounted to an exhaust system of a vehicle, the exhaust system being mechanically connected to an engine and comprising a catalyst, a center muffler and a rear muffler, the loudspeaker being mounted to the rear muffler, the loudspeaker having a front face, the loudspeaker operatively coupled to the active noise controller and configured to convert the anti-noise signal into anti-noise sound;
- at least one of a loudspeaker mount, a grille, and a land at the front face of the loudspeaker;
- a first one of the reference sensors is acoustically or mechanically coupled to the engine;
- a second one of the reference sensors is acoustically or mechanically coupled to the exhaust system between the catalyst and the center muffler:
- a third one of the reference sensors is acoustically or mechanically coupled to the exhaust system between the center muffler and the rear muffler;
- and
- acoustic error sensors mounted to one of the loudspeaker mount, the grille, or the land at the front face of the loudspeaker and operatively coupled to the active noise controller, the acoustic error sensors being configured to pick up sound and to convert the picked-up sound into the error signal.
6 more elements
A system comprising:
- an active noise controller configured to generate an anti-noise signal based on an error signal;
- one or more reference sensors including at least one of a temperature sensor and a noise-vibration-harshness sensor operatively coupled to the active noise controller to provide temperature measurements and noise and vibration measurements at various positions, the one or more reference sensors being operatively coupled to the active noise controller and configured to provide at least one reference signal representative of noise from at least one noise source, a first one of the reference sensors is acoustically coupled to an engine, a second one of the reference sensors is acoustically coupled to an exhaust system between a catalyst and a center muffler, and a third one of the reference sensors is acoustically coupled to the exhaust system between the center muffler and a rear muffler;
- a loudspeaker mounted to the exhaust system and having a front face, the loudspeaker operatively coupled to the active noise controller and configured to convert the anti-noise signal into anti-noise sound;
- an acoustic error sensor disposed at the front face of the loudspeaker and operatively coupled to the active noise controller, the acoustic error sensor being configured to pick up sound and to convert the picked-up sound into the error signal;
- and
- the active noise controller being further configured to generate an anti-noise signal that is also based on measurements of at least one of temperature measurements at various positions and noise and vibrations measurements at various positions.
3 more elements
A method comprising:
- with an active noise controller, generating an anti-noise signal based on an error signal;
- with a loudspeaker, converting the anti-noise signal into anti-noise sound, the loudspeaker is mounted to an exhaust system of a vehicle, the exhaust system being mechanically connected to an engine and comprising a catalyst, a center muffler and a rear muffler, the loudspeaker being mounted to the rear muffler;
- with an acoustic error sensor, picking up sound and converting the picked-up sound into the error signal;
- wherein
- the loudspeaker comprises a front face, and at its front face at least one of a loudspeaker mount, grille and land;
- with one or more reference sensors, providing to the active noise controller at least one reference noise signal representative of noise from at least one noise source, one or more reference sensors are acoustically coupled in a manner selected from the group consisting of:
- a first one of the reference sensors acoustically coupled to the engine, a second one of the reference sensors acoustically coupled to the exhaust system between the catalyst and the center muffler, and a third one of the reference sensors acoustically coupled to the exhaust system between the center muffler and the rear muffler;
- and
- the acoustic error sensor is mounted at the front face of the loudspeaker to one of the loudspeaker mount, grille or land.
6 more elements
A system comprising:
- an active noise controller having a plurality of adaptive noise filters connected in parallel, the active noise controller is configured to generate an anti-noise signal based on an error signal;
- each adaptive noise filter has a finite impulse response filter with a filter length different from the other adaptive noise filters;
- a loudspeaker haying a front face, the loudspeaker operatively coupled to the active noise controller and configured to convert the anti-noise signal into anti-noise sound, the loudspeaker is mounted to an exhaust system of a vehicle, the exhaust system being mechanically connected to an engine and comprising a catalyst, a center muffler and a rear muffler, the loudspeaker being mounted to the rear muffler, the system further comprises acoustic coupling of one or more reference sensors from the group consisting of;
- a first one of the reference sensors is acoustically coupled to the engine, a second one of the reference sensors is acoustically coupled to the exhaust system between the catalyst and the center muffler, and a third one of the reference sensors is acoustically coupled to the exhaust system between the center muffler and the rear muffler;
- an acoustic error sensor disposed at the front face of the loudspeaker, the acoustic error sensor operatively coupled to the active noise controller, the acoustic error sensor being configured to pick up sound and to convert the picked-up sound into the error signal;
- and
- one or more reference sensors operatively coupled to the active noise controller and configured to provide at least one reference noise signal representative of noise from at least one noise source.
4 more elements
A system comprising:
- an active noise controller having a plurality of adaptive noise filters connected in parallel, the active noise controller is configured to generate an anti-noise signal based on error signals from acoustic error sensors;
- each adaptive noise filter has a finite impulse response filter with a filter length different from the other adaptive noise filters;
- at least one of temperature and noise-vibration-harshness sensors operatively coupled to the active noise controller and providing measurements of temperatures and noise and vibrations;
- a loudspeaker having a front face, the loudspeaker operatively coupled to the active noise controller and configured to convert the anti-noise signal into anti-noise sound:
- the acoustic error sensors disposed at the front face of the loudspeaker, the acoustic error sensors operatively coupled to the active noise controller, the acoustic error sensors being configured to pick up sound and to convert the picked-up sound into the error signal;
- one or more reference sensors operatively coupled to the active noise controller and configured to provide at least one reference noise signal representative of noise from at least one noise source;
- and
- the active noise controller being further configured to generate an anti-noise signal that is also based on at least one of temperature and noise-vibration-harshness measurements from the sensors.
5 more elements
Dependencies are inferred from the claim text.