Various aspects include a wearable audio device having active noise reduction (ANR). In some cases, a method for processing audio signals includes receiving a noise reduction signal configured to modify an audio signal and generate a noise reduced audio signal, the noise reduction signal having a nominal loop gain; and generating an adjusted noise reduction signal in response to a detected adverse low frequency event, the adjusted noise reduction signal having a modulated loop gain configured to reduce artifacts in the noise reduced audio signal.

Systems and methods for ambient noise mitigation as a network service are provided. In some embodiments, an ambient noise mitigation server establishes at least one low latency network slice for at least one UE coupled to a radio access network. The ambient noise mitigation server generates a cancelation signal based on ambient sound mitigation data received by the radio access network, the ambient sound mitigation data including acoustic sensor data representing an ambient sound signal. The cancelation signal is generated to comprise a phase shift with respect to the ambient sound signal computed at least in part as a function of a location of the at least one UE, and causes at least one acoustic emitter to emit an acoustic cancelation signal based on the cancelation signal. In some embodiments, the phase shift may be adjusted by controlling a latency characteristic of the low latency network slice.

Disclosed is a system for controlling acoustic radiation from an aircraft. The system comprising a plurality of rotor systems (one or more) and a noise controller configured to regulate acoustic radiation from the plurality of rotor systems. The noise controller can be configured to regulate a commanded flight setting from the flight control system and to output a regulated flight setting to the plurality of rotor systems. Based on the regulated flight setting, the plurality of rotor systems are configured to generate, individually and in aggregate, acoustic radiation having a target acoustic behavior. The target acoustic behavior may be achieved using beamforming techniques to, for example, change the directionality of acoustic radiation from the plurality of rotor systems, or otherwise tune the acoustic radiation to reduce detectability and/or annoyance.

A vehicle sound effect generation apparatus generates a sound effect of an engine based on a vibration sound database including a fundamental wave sound having a fundamental frequency component and a plurality of adjustment wave sounds having a frequency component other than the fundamental frequency component. The vehicle sound effect generation apparatus includes a running state detecting unit that detects a running state of a vehicle, a sound effect generation unit that synthesizes the fundamental wave sound with the adjustment wave sounds based on the running state of the vehicle, and a visual guidance direction setting unit that sets a visual guidance direction at which a vehicle occupant shoots a look. The sound effect generation unit causes output characteristics of a sound effect in the visual guidance direction to increase more than output characteristics of a sound effect in a direction other than the visual guidance direction.

A sensor is configured to infer a rotational speed of a tire of a vehicle. A frequency generator is configured to synthesize frequencies of a tire cavity resonance according to the rotational speed of the tire to generate a sense signal. An active noise control filter is configured to generate an antinoise signal from the sense signal. A loudspeaker configured to convert the antinoise signal into antinoise and to radiate the antinoise to a listening position. The antinoise signal is configured so that the antinoise reduces sound of the tire cavity resonance at the listening position.

Systems and methods for active noise cancellation are provided. An example method includes receiving at least two reference signals associated with at least two reference positions. Each of the at least two reference signals includes at least one captured acoustic sound representing an unwanted noise. The reference signals are filtered by individual filters to obtain filtered signals. The filtered signals are combined to obtain a feedforward signal. The feedforward signal is played back to reduce the unwanted noise at a pre-determined space location. The individual filters are determined based on linear combinations of at least two transfer functions. Each of the at least two transfer functions is associated with one of the reference positions. In certain embodiments, the at least two reference signals are captured by at least two feedforward microphones.

A system for generating a silent zone at a listening position is provided. The system includes a loudspeaker, an error microphone, a microphone array, and a noise controller. The loudspeaker is configured to radiate sound that corresponds to a sound signal. The error microphone is configured to pick up noise radiated by a noise source and the sound radiated by the loudspeaker via a secondary path. The microphone array is configured to pick up noise radiated by a noise source and the sound from the loudspeaker. The microphone array is configured to generate corresponding array signals. The noise controller is configured to receive a noise signal representative of noise radiated by the noise source and to filter the noise signal with a controllable noise reduction transfer function. The noise controller is further configured to control the noise reduction transfer function based on the noise signal and a virtual error signal.

A masking sound adjustment method includes obtaining, in each of a plurality of frequency bands, a volume adjustment amount of a masking sound with respect to a volume of a conversation sound to be masked, based on a threshold value corresponding to a target word intelligibility of the conversation sound to be masked; and adjusting a volume of the masking sound in each of the plurality of frequency bands based on the volume adjustment amount.

A method and system for noise cancellation is disclosed. In one embodiment, the method may include receiving, from a first sensor, a first signal indicative of a noise generated by an equipment. The first sensor may be configured to generate the first signal indicative of the noise generated by the equipment. The first sensor may be positioned in proximity to the equipment. The method may further include generating a noise cancellation signal based on the first signal and triggering a speaker to generate a sound corresponding to the noise cancellation signal, wherein the speaker is positioned in proximity to the equipment.

An audio data processing method, an electronic device, and a non-transitory computer-readable storage medium are provided. The method includes: obtaining a current audio-playback mode of the audio playback device; in response to the current audio playing mode being an active noise cancellation mode, obtaining an ambient sound, performing characteristic analysis on an ambient sound signal at a first preset frequency band, and obtaining a first low-frequency (LF) signal characteristic value of the ambient sound; performing characteristic analysis on an audio signal played by the audio playback device at a second preset frequency band, and obtaining a second LF signal characteristic value of the audio signal; and adjusting a feedback noise-reduction parameter of the audio playback device based on the second LF signal characteristic value, in response to the first LF signal characteristic value being greater than a first preset threshold value.