Bose Corporation

Hiroshi Miyazaki

Hal P Greenberger

Michael W Stark

Christopher P Ludwig

Cristian Marius Hera

Douglas J Holmi

Brandon B Westley

Seiji Kawakami

William L Givens

A method is provided for attenuating road noise in a vehicle cabin. The method includes filtering a noise signal representative of road noise with a first fixed filter to provide an attenuation signal, and filtering the attenuation signal with an adaptive filter to provide a first filtered attenuation signal. The first filtered attenuation signal is provided to an electro-acoustic transducer for transduction to acoustic energy, thereby to attenuate the road noise in a vehicle cabin at an expected position of an occupant's ears. The method also includes receiving a microphone signal representative of the acoustic energy, filtering the attenuation signal with a second fixed filter to provide a second filtered attenuation signal, and updating a set of variable filter coefficients of the adaptive filter based on the microphone signal and the second filtered attenuation signal to accommodate for variations in a transfer function of the speaker.

Adaptive transducer calibration for fixed feedforward noise attenuation systems

The invention features a dual-mode audio system for an automobile which in one mode is configured for play while the doors to the automobile are closed, and in a second mode, is configured for play while a door, such as a tailgate, is opened. Additionally, the invention also features a battery monitor which monitors the operating condition of the battery and may estimate the energy capacity of the battery. The system may also take power conservation measures if the system determines that the engine is not running or the operating condition of the batter reaches a predetermined state. The invention also features a remote control integrated within a key fob for controlling the audio system. The invention features various orientations for mounting a pair of loudspeakers within an automobile which directly radiate sound out of a rear opening of the automobile.

Automobile audio system

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Framingham, MA, United States of America

Hiroshi Miyazaki