Abstract: In at least one embodiment, an active noise cancellation (ANC) system is provided. An audio signal source provides an audio signal. At least one loudspeaker projects anti-noise sound within a cabin. At least one microphone provides a first error signal indicative of the noise, the audio signal, and the anti-noise sound and a second error signal indicative of an estimated anti-noise signal. At least one controller is programmed to receive the first error signal and the second error signal and to provide an estimated impulse response based at least on the first error signal and the second error signal. The at least one controller is further programmed to compare the estimated impulse response to one or more pre-stored impulse responses; and to select a first pre-stored impulse response that matches the estimated impulse response to filter one or more reference signals at an adaptive filter to generate the anti-noise signal.

Abstract: A vehicle audio system is provided with at least one loudspeaker to project sound within a room in response to receiving an audio signal. A controller is programmed to generate the audio signal based on at least one occupancy signal indicative of occupant presence and identification within the room, wherein the audio signal is indicative of at least one of anti-noise sound, synthesized engine noise (SEN), and music.

Abstract: Adjustment of active noise cancellation (ANC) systems can include determining a noise within a vehicle; detecting a movement of a head of a listener; adjusting one or more parameters of the ANC system based at least on the noise and the movement of the head of the listener; determining an anti-noise based at least on the adjusted one or more parameters; and outputting the anti-noise.

Abstract: A vehicle audio system is provided with at least one loudspeaker to project sound within a room in response to receiving an audio signal. A controller is programmed to generate the audio signal based on at least one occupancy signal indicative of occupant presence and identification within the room, wherein the audio signal is indicative of at least one of anti-noise sound, synthesized engine noise (SEN), and music.

Abstract: Embodiments are provided for receiving a request to output audio at a first speaker and a second speaker of an electronic device, determining that the electronic device is oriented in a portrait orientation or a landscape orientation, identifying, based on the determined orientation, a first equalization setting for the first speaker and a second equalization setting for the second speaker, providing, for output at the first speaker, a first audio signal with the first equalization setting, and providing, for output at the second speaker, a second audio signal with the second equalization setting.

Abstract: An active noise cancellation (ANC) system is provided with at least one loudspeaker to project anti-noise sound within a passenger cabin of a vehicle in response to receiving an anti-noise signal. At least one microphone provides an error signal indicative of noise and the anti-noise sound within the passenger cabin. An occupancy controller is programmed to modify a transfer function between the at least one microphone and at least one virtual microphone based on an occupancy signal indicative of occupant presence within the passenger cabin. An adaptive filter controller is programmed to filter the error signal using the transfer function to obtain an estimated virtual microphone error signal. A controllable filter generates the anti-noise signal based on the estimated virtual microphone error signal.

Abstract: An active noise cancellation (ANC) system is provided with at least one loudspeaker to project an anti-noise sound within a room in response to receiving an anti-noise signal. A first controller is programmed to adjust a transfer function indicative of a secondary path between the at least one loudspeaker and at least one microphone within the room based on a resonance frequency of the at least one loudspeaker, and to generate the anti-noise signal based on the adjusted transfer function.

Abstract: An active noise cancellation (ANC) system is provided with at least one loudspeaker to project an anti-noise sound within a room in response to receiving an anti-noise signal. A first controller is programmed to adjust a transfer function indicative of a secondary path between the at least one loudspeaker and at least one microphone within the room based on a resonance frequency of the at least one loudspeaker, and to generate the anti-noise signal based on the adjusted transfer function.

Abstract: A disclosed method includes monitoring an audio signal energy level while having a noise suppressor deactivated to conserve battery power, buffering the audio signal in response to a detected increase in the audio energy level, activating and running a voice activity detector on the audio signal in response to the detected increase in the audio energy level and activating and running a noise estimator in response to voice being detected in the audio signal by the voice activity detector. The method may further include activating and running the noise suppressor only if the noise estimator determines that noise suppression is required. The method activates and runs a noise type classifier to determine the noise type based on information received from the noise estimator and selects a noise suppressor algorithm, from a group of available noise suppressor algorithms, where the selected noise suppressor algorithm is the most power consumption efficient.

Abstract: A road noise cancellation (RNC) system is provided with at least one loudspeaker to project anti-noise sound within a passenger cabin of a vehicle in response to an anti-noise signal; and a controller. The controller is programmed to: determine a coherence value between a noise signal indicative of road induced noise and an error signal indicative of noise and the anti-noise sound within the passenger cabin; estimate a noise reduction value based on the coherence value; filter the noise signal and the error signal based on the estimated noise reduction value; and generate the anti-noise signal based on the filtered noise signal and the filtered error signal.

Abstract: Embodiments are provided for receiving a request to output audio at a first speaker and a second speaker of an electronic device, determining that the electronic device is oriented in a portrait orientation or a landscape orientation, identifying, based on the determined orientation, a first equalization setting for the first speaker and a second equalization setting for the second speaker, providing, for output at the first speaker, a first audio signal with the first equalization setting, and providing, for output at the second speaker, a second audio signal with the second equalization setting.

Abstract: In at least one embodiment, an active noise cancellation (ANC) system is provided. The ANC system includes at least one microphone, a first filter, a first controllable filter, and at least one controller. The at least one microphone provides an error signal indicative of noise and an anti-noise sound within the cabin. The first filter modifies a transfer function between the at least one microphone and at least one remote microphone location to generate an estimated remote microphone error signal based at least on the error signal. The first controllable filter generates the anti-noise signal based on the estimated remote microphone error signal. The controller receives receive a first signal indicative of the vehicle exhibiting a fast-adapting event controls the first filter to execute a predetermined filter based on the first signal to reduce a group delay associated with the first filter.

Abstract: A heat exchanger with a monocoque structure transfers heat between a first fluid and a second fluid. The heat exchanger has a plurality of tubes through which the first fluid may flow in a direction, each of the plurality of tubes has a first mouth end, an opposing second mouth end and a waist region between the first mouth end and the second mouth end. The heat exchanger also has one or more intercomlected fluid challllels through which the second fluid may flow. the one or more fluid chamlels lay generally in a plane, the plurality of tubes and the one or more fluid channels interleave such that heat may be transferred between the plurality of tubes and the one or more fluid challllels, and the direction of flow of the first fluid is generally perpendicular to the plane of the one or more fluid chamlels.

Abstract: Adjustment of active noise cancellation (ANC) systems can include determining a noise within a vehicle; detecting a movement of a head of a listener; adjusting one or more parameters of the ANC system based at least on the noise and the movement of the head of the listener; determining an anti-noise based at least on the adjusted one or more parameters; and outputting the anti-noise.

Abstract: A heat exchanger with a monocoque structure transfers heat between a first fluid and a second fluid. The heat exchanger in has a plurality of tubes through which the first fluid may flow in a direction, each of the plurality of tubes has a first mouth end, an N opposing second mouth end and a waist region between the first mouth end and the second mouth end. The heat exchanger also has one or more interconnected fluid channels through which the second fluid may flow, the one or more fluid channels lay generally in a plane, the plurality of tubes and the one or more fluid channels interleave such that heat may be transferred between the plurality of tubes and the one or more fluid channels, and the direction of flow of the first fluid is generally perpendicular to the plane of the one or more fluid channels.

Abstract: A vehicle sound synthesis system is provided with a controller and a loudspeaker. The controller is programmed to receive an input indicative of at least one of a gear selection, an engine speed, and a pedal position and to generate an audio signal indicative of synthesized engine noise (SEN). The controller is further programmed to attenuate the audio signal at a first rate in response to at least one of the gear selection, the engine speed, and the pedal position indicating first vehicle conditions. The loudspeaker is adapted to project sound within a passenger compartment of a vehicle in response to receiving the attenuated audio signal.

Abstract: A vehicle sound synthesis system is provided with a loudspeaker, a microphone and a controller. The loudspeaker is adapted to project sound indicative of synthesized engine noise (SEN) within a cabin of a vehicle in response to receiving an adjusted SEN signal. The microphone is disposed in the cabin and adapted to provide a microphone signal having a SEN component and a noise component. The controller is programmed to receive the microphone signal, adjust a SEN signal based on the microphone signal, and provide the adjusted SEN signal to the loudspeaker.

Abstract: A active noise cancellation (ANC) system may include an adaptive filter divergence detector for detecting divergence of the one or more controllable filters as they adapt, based on various temporal or frequency domain amplitude characteristics. Upon detection of a controllable filter divergence, the ANC system may be deactivated, or certain speakers may be muted. Alternatively, the ANC system may modify the diverged controllable filters to restore proper operation of the noise cancelling system. This may include adjusting a leakage value of an adaptive filter controller.

Abstract: A method includes receiving a request to output audio at a speaker of an electronic device, determining whether the speaker of the electronic device is facing substantially towards or away from a support surface, identifying, based on whether the speaker of the electronic device is facing substantially towards or away from the support surface, an equalization setting, and providing, for output at the speaker of the electronic device, an audio signal with the equalization setting.

Abstract: A vehicle sound synthesis system is provided with a loudspeaker and a controller. The loudspeaker projects sound indicative of synthesized engine noise (SEN) within a cabin of a vehicle in response to receiving a SEN signal. The controller is programmed to generate the SEN signal; and receive a first input indicative of an engine start command. The controller is further programmed to, modulate a characteristic of the SEN signal to align with a corresponding engine operating characteristic during starting conditions in response to the engine start command; and provide an adjusted SEN signal including the modulated characteristic to the loudspeaker.