Active noise reduction method and device

Abstract

The invention provides an active noise reduction method and an active noise reduction device. The active noise reduction device comprises a storage unit which stores a signal sample of at least one type of valid sounds in advance, an acquisition unit used to acquire environment sound signals, a comparing unit used to compare the environment sound signals acquired by the acquisition unit with the signal sample of the at least one type of the valid sounds, stored in the storage unit in advance, so as to obtain the type of the valid sounds similar to the environment sound signals at a degree larger than a preset threshold value, an extraction unit used to extract a noise signal form the environment sound signals acquired by the acquisition unit according to the type of the valid sounds, obtained by the comparing unit, after signals corresponding to the valid sounds are eliminated from the environment sound signals and a generation unit used to generate a noise reduction signal according to the noise signal obtained by the extraction unit, wherein the noise reduction signal is used to counteract environment sounds after all the valid sounds are eliminated. The active noise reduction method and the active noise reduction device can solve the problem that active noise reduction can shield the valid sounds in the environment sounds.

Description

technical field [0001] The invention relates to the technical field of audio information processing, in particular to an active noise reduction method and device. Background technique [0002] Active noise control technology (Active Noise Control, ANC) is based on the principle of two sound wave destructive interference or sound radiation suppression, by canceling the sound source (secondary sound source) to generate sound waves that are offset by the sound source (primary sound source) The sound wave radiation with equal size and opposite phase cancels each other, so as to achieve the purpose of reducing noise. At present, this technology has been widely used in production and life. At present, active noise reduction headphones are sold, which can well eliminate the influence of external environmental noise. It is especially suitable for home theaters, so that people can enjoy movies without external noise interference. [0003] However, while the external noise is elimina...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects in the prior art, the present invention provides an active noise reduction method and device, which can solve the problem that the active noise reduction will shield the effective sound in the ambient sound

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