Active noise reduction system and method for eliminating noise floor interference

An active noise reduction and noise reduction technology, applied in the field of signal processing, can solve the problems of reducing the weight of music playback, difficulty in achieving noise reduction effects, and limited dynamic range of AD converters, etc., to achieve the goal of expanding dynamic range, reducing impact, and reducing frequency Effect

Active Publication Date: 2019-02-15
BESTECHNIC SHANGHAI CO LTD
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AI Technical Summary

Problems solved by technology

[0003] In the existing active noise reduction scheme, it is easily affected by external low-frequency noise, resulting in "popping" and "popping" sounds
Simple active noise reduction headphones will affect people's reception of external voice and other signals, causing inconvenience to people on specific occasions, and active noise reduction can easily eliminate low-frequency components of m

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  • Active noise reduction system and method for eliminating noise floor interference
  • Active noise reduction system and method for eliminating noise floor interference
  • Active noise reduction system and method for eliminating noise floor interference

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Embodiment Construction

[0035] The objects and functions of the present invention and methods for achieving the objects and functions will be clarified by referring to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in various forms. The essence of the description is only to help those skilled in the relevant art comprehensively understand the specific details of the present invention.

[0036] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, and related technical terms should be familiar to those skilled in the art. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps, unless otherwise specified. The following is a detailed description of the invention of an active noise reduction system and method for eliminating background noise interference through specific embodiments. According...

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Abstract

The invention provides an active noise reduction system for eliminating noise floor interference, which comprises at least one noise reduction channel. The noise reduction channel comprises a microphone, an AD converter, a noise reduction filter and a DA converter, wherein a programmable gain amplifier is connected between the microphone and the AD converter for adjusting an input signal of the microphone; a first dynamic range expansion module is connected between the AD converter and the noise reduction filter for expanding the dynamic range of the AD converter; a second dynamic range expansion module is connected between the noise reduction filter and the DA converter for expanding the dynamic range of the DA converter. The active noise reduction system for eliminating noise floor interference in the invention expands the dynamic range of the AD converter and the DA converter and reduces the noise floor of the noise reduction headset.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to an active noise reduction system and method for eliminating background noise interference. 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] In the existing active noise reduction scheme, it is easily affected by external low-frequency noise, resulting in "popping" and "popping" sounds. Simple active noise reduction headphones will affect people's reception of external voice and other signals, causing inconvenience to people on specific occasions, and active noise reduction can easily eliminate low-...

Claims

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Application Information

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IPC IPC(8): H04R3/00
CPCH04R3/00H04R2410/01
Inventor 杨磊童伟峰张亮徐明亮
Owner BESTECHNIC SHANGHAI CO LTD
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