Acoustic devices

A noise reduction method, comprising:

• acquiring an environmental noise using a microphone array;
• acquiring motion information of the acoustic device using one or more sensors;
• estimating a sound field at a target spatial position using the microphone array using a processor, wherein the target spatial position is closer to an ear canal of a user than each microphone in the microphone array;
• estimating a noise at the target spatial position based on the environmental noise using the processor:
• updating the noise at the target spatial position and the sound field estimation of the target spatial position based on the motion information using the processor;
• generating a noise reduction signal based on the updated noise at the target spatial position and the updated sound field estimation of the target spatial position using the processor;
• and
• outputting a target signal based on the noise reduction signal using at least one speaker, the target signal being used to reduce the environmental noise, wherein the microphone array is arranged in a target area to minimize an interference signal from the at least one speaker to the microphone array.