Cancellation of vehicle active sound management signals for handsfree systems
AssigneeBose Corporation
InventorsCristian Marius Hera, Samuel Sangmin Rhee
Life of this patent
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Abstract
Audio systems and methods are provided that receive a sound management input signal as a reference signal to remove related content from a microphone signal in, e.g., an automotive hands-free system. The sound management signal may provide an acoustic augmentation to reduce, enhance, or create an acoustic effect, e.g., of an engine, motor, or other operating components. A signal processor receives the sound management signal and the microphone signal, and reduces or removes the sound management signal components from the microphone signal.
Claims9
An audio system, comprising:
- a sound management system that receives information about a rotation rate of at least one of an engine, a motor, a transmission, an axle, or a wheel and provides a sound management signal configured to enhance or to reduce at least one harmonic of the engine, motor, transmission, axle, or wheel;
- a signal processor coupled to the sound management system and configured to receive the sound management signal and provide at least one driver signal based at least in part upon the sound management signal;
- an acoustic transducer coupled to the signal processor and configured to receive the at least one driver signal and to convert the at least one driver signal into acoustic signals in a listening environment;
- a microphone positioned in the listening environment to provide a microphone signal from the listening environment, the microphone signal including an echo component related to the acoustic signal produced by the acoustic transducer;
- and
- a cancelation filter coupled to the sound management system and the microphone, the cancelation filter configured to receive the information about the rotation rate and the microphone signal, the cancelation filter further configured to reduce from the microphone signal, based upon the information about the rotation rate, at least a portion of the echo component related to the sound management signal.
A method of providing a voice audio signal from a user in an acoustic environment, the method comprising:
- receiving a sound management signal from a sound management system, the sound management system receiving information about a rotation rate of at least one of an engine, a motor, a transmission, an axle, or a wheel and providing the sound management signal configured to enhance or to reduce at least one harmonic of the engine, motor, transmission, axle, or wheel in the acoustic environment;
- processing the sound management signal to provide a driver signal;
- converting the driver signal, by an acoustic transducer, into an acoustic signal in the acoustic environment;
- receiving a microphone signal representative of the acoustic environment, including the user's voice audio signal and including an echo component related to the acoustic signal;
- filtering the information about the rotation rate to provide an estimated echo signal, the estimated echo signal thereby being related to the sound management signal;
- combining the estimated echo signal with the microphone signal to reduce the echo component from the microphone signal to provide an estimated voice signal;
- and
- providing the estimated voice signal to a voice processing system.
Dependencies are inferred from the claim text.