Automatic switching system and method for realizing active noise cancellation and sound-outside-earphone pickup

Abstract

The invention provides an automatic switching system for realizing active noise cancellation and sound-outside-earphone pickup. The automatic switching system comprises a feedforward microphone, a first AD converter, a first low-delay filter, a feedforward filter, a sound-outside-earphone pickup filter and a voice activity detecting unit, wherein the feedforward microphone is arranged on the outerside of an earphone, and is used for acquiring ambient sounds outside the earphone; the first AD converter, the first low-delay filter and the feedforward filter are sequentially connected with the feedforward microphone; the sound-outside-earphone pickup filter is connected with the first low-delay filter, and is used for picking up sounds outside the earphone; and the voice activity detecting unit is used for detecting acquired ambient sound signals, and transmitting a switching command to control the switching of the feedforward filter and the sound-outside-earphone pickup filter. The automatic switching system automatically detects the external ambient sounds, switches active noise cancellation and sound-outside-earphone pickup according to the external ambient sounds, can adapt to different scenes effectively, and enhances the user experience.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an automatic switching system and method for realizing active noise reduction and extraaural sound pickup. Background technique [0002] Active noise-canceling headphones are gradually coming into people's lives, allowing people to get a relatively quiet environment in a noisy environment. The principle is to cancel the sound wave (feedforward) or add a feedback acoustic path (feedback) to the sound path to reduce the noise heard by the ear by actively sending out sound waves with opposite phases through the earphones. [0003] However, the noise reduction earphones in the prior art mainly perform simple noise reduction, but the pure active noise reduction earphones, especially the earplug earphones, will affect people’s reception of external voice and other signals, external environmental noise and other signals, causing inconvenience to people. [0004] Therefore, i...

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Problems solved by technology

[0003] However, the noise reduction earphones in the prior art mainly perform simple noise reduction, but the pure active noise reduction earphones, especially th...

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