Device and method for eliminating noise

Abstract

The invention provides a device for eliminating noise. The device comprises a voice receiving module for receiving a voice signal (S), a first acoustic generator for receiving and playing an output signal from the voice receiving module, a noise processing module, and a second acoustic generator for receiving and playing an output signal from the noise processing module, wherein, the noise processing module comprises a noise receiver for receiving and processing a noise signal (N), a comparer for receiving an output signal from the noise receiver and judging the noise level, the processing module for receiving an output signal from the comparer, and the second acoustic generator for receiving and playing the output signal from the processing module. The device in the invention has the advantages that the adopted two acoustic generators can respectively meet the voice wide band requirement and the strong-low frequency requirement of a narrow reverse-phase de-noising signal band, thus avoiding mutual restriction on performances; and the voice signal does not pass through a de-noising circuit in feedback design, thus preventing distortion.

Description

【Technical field】 [0001] The invention relates to a noise elimination device and a noise elimination method, in particular to a noise elimination device and a noise elimination method using double receivers. 【Background technique】 [0002] Active noise control (also known as active control) refers to the use of additional secondary sound sources to generate sound waves with the same frequency, similar amplitude, and opposite phase to the original noise, so that they can interact with the original noise to reduce spatial noise. Purpose. [0003] In the related art, when the active noise control system is applied in earplugs, earmuffs or mobile phones, the same receiver is used. At this time, the receiver not only needs to perform normal voice sound wave radiation, but also realizes the playback of noise inverse phase sound waves for active noise cancellation. However, voice sound wave radiation requires wide frequency band and high power; noise inverse sound wave playback r...

AI Technical Summary

Problems solved by technology

However, voice sound wave radiation requires wide frequency band and high power; noise inverse sound wave playback requires high frequency to be cut off earlier and high power, making a single receiver a bottleneck in radiation power, and a contradiction in radiation frequency band, which cannot be balanced

Moreover, it is also difficult to avoid the interference of the noise canceling signal on the voice signal on the circuit, causing the voice signal to be distorted.

Because in the noise canceling circuit designed with feedback, the voice signal is in the entire feedback loop, which will inevitably be affected by the feedback circuit, causing the signal to be distorted during playback, which will affect the user's hearing experience to a certain extent.

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