Audio encoder for wind and microphone noise reduction in a microphone array system

摘要

An audio system encodes and decodes audio captured by a microphone array system in the presence of wind noise. The encoder encodes the audio signal in a way that includes beamformed audio signal and a “hidden” representation of a non-beamformed audio signal. The hidden signal is produced by modulating the low frequency signal to a high frequency above the audible range. A decoder can then either output the beamformed audio signal or can use the hidden signal to generate a reduced wind noise audio signal that includes the non-beamformed audio in the low frequency range.

主权项

1. A method for encoding an audio signal captured by a microphone array system in the presence of wind noise, the method comprising:
capturing at least a first audio signal via a first microphone of a microphone array and a second audio signal via a second microphone of the microphone array; combining the first audio signal and the second audio signal to generate a beamformed audio signal; determining a selected audio signal having a lower wind noise metric between the first audio signal and the second audio signal; processing the selected audio signal to modulate the selected audio signal based on a high frequency carrier signal to generate a high frequency signal; and combining the high frequency signal and the beamformed audio signal to generate an encoded audio signal.