Active noise reduction method and system for eliminating the influence of noise reduction channel on playback sound
It is an active noise reduction and channel technology, which is applied in earphones to reduce environmental noise, transducer acoustic response prevention, earpiece/earphone accessories, etc. It can solve problems such as the impact of playing sound and the difficulty in restoring the quality of sound, so as to prevent the sound from being played as a whole. effect of influence
Active Publication Date: 2020-02-18
BESTECHNIC SHANGHAI CO LTD
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However, the active noise reduction method in the prior art will have a certain impact on the playback sound. When the noise is eliminated, the sound played by the earphone will be reduced overall, and the reduced sound will be difficult to restore to the original quality.
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[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 content of the present invention will be described below in conjunction with specific embodiments. The content of the present invention is based on the fact that during the active noise...
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The invention provides an active noise reduction method for eliminating an influence of a noise reduction path on playing sound. The method includes the following steps: dividing a digital signal played by a playing source into a first path of digital signals and a second path of digital signals, wherein the first path of digital signals are converted into an analog electrical signal by a DA converter and are transmitted to a player for sound playing, and the second path of digital signals are transmitted to a first digital filter for filtering to obtain a digital cancellation signal; enablinga microphone to collect noise signals and sound signals played by the player, and converting the collected noise signals and sound signals into a digital mixed signal through an AD converter; and carrying out coupling processing on the digital mixed signal and the digital cancellation signal by using an adder to output a third path of digital signals, wherein the third path of digital signals enter the noise reduction path to eliminate environmental noises. According to the scheme of the invention, the influence on the playing sound can be reduced while the noises can be eliminated, and the quality of the playing sound in a sound cavity can be ensured.
Description
technical field [0001] The invention relates to the technical field of noise processing, in particular to an active noise reduction method and a noise reduction system for eliminating the influence of a noise reduction channel on playing sound. Background technique [0002] With the continuous development of intelligence and the continuous improvement of people's living standards, people's requirements for earphones are also gradually increasing. Generally, there are usually two methods for earphone noise reduction, namely active noise reduction and passive noise reduction. [0003] Active noise reduction is to cancel the noise sound wave and eliminate the environmental noise through the noise reduction system to emit sound waves with a phase opposite to that of the environmental noise, thereby achieving the effect of noise reduction. Passive noise reduction is to block external noise by surrounding the ears to form a closed space, or using sound-isolating materials such as...
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IPC IPC(8): H04R1/10H04R3/02
CPCH04R1/1083H04R3/02
Inventor 徐明亮杨磊郑立科童伟峰霍允杰
Owner BESTECHNIC SHANGHAI CO LTD