Unlock instant, AI-driven research and patent intelligence for your innovation.

Active noise reduction method and device and audio playing equipment

A technology for audio playback and active noise reduction. It is used in earphones to reduce environmental noise, speech analysis, and sound-producing equipment. It can solve problems such as poor high-frequency noise noise reduction.

Pending Publication Date: 2022-01-25
HUAWEI TECH CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, existing active noise reduction systems are less effective at reducing high-frequency noise

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Active noise reduction method and device and audio playing equipment
  • Active noise reduction method and device and audio playing equipment
  • Active noise reduction method and device and audio playing equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0115] The technical solution in this application will be described below with reference to the accompanying drawings.

[0116] First, the technical terms involved in this application are introduced.

[0117] 1. The principle of active noise reduction

[0118] Active noise reduction is a noise control technique that attenuates the initial noise by referencing a sound wave from a secondary sound source that is equal in amplitude and opposite in phase to that of the primary sound source. The output of the secondary sound source is used to interfere with the primary sound source. (noise source), such as figure 1 shown.

[0119] 2. Classification of Active Noise Cancellation

[0120] According to the classification of control circuit, it can include: analog type and digital type.

[0121] According to the control structure classification can include: feed forward (feed forward), feedback (feed back) and composite.

[0122] 3. Feedforward active noise reduction system

[0123...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides an active noise reduction method and device and audio playing equipment. The noise reduction effect of high-frequency noise can be improved. The method comprises the steps: acquiring a first reference signal collected by a reference sensor, wherein the first reference signal is used for representing environment noise outside the audio playing equipment, and the reference sensor is arranged outside the audio playing equipment; performing pre-emphasis processing on the first reference signal to obtain a target reference signal; filtering the target reference signal to obtain a first output signal for noise reduction, wherein the phase of the first output signal is opposite to the phase of the target reference signal; performing de-emphasis processing on the first output signal to obtain a target output signal; and controlling a loudspeaker to play the target output signal.

Description

technical field [0001] The present application relates to the technical field of active noise reduction, especially the active noise reduction technology for earphones. And more specifically, it relates to an active noise reduction method and device and an audio playback device in the technical field of active noise reduction. Background technique [0002] Active noise reduction (active noise control, ANC) is a noise reduction technology, and is one of the noise reduction methods applied to headphones. The active noise reduction function refers to the generation of reverse sound waves equal to the external noise through the noise reduction system to neutralize the noise, thereby achieving the effect of noise reduction. [0003] The basic principle of active noise reduction is based on the reference signal collected by the reference microphone set outside the earphone and / or the error signal collected by the error microphone set inside the earphone, and calculate the reverse...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04R1/10G10K11/178G10L21/0208
CPCH04R1/1083G10K11/17854G10L21/0208G10K11/178H04R1/10
Inventor 张立斌袁庭球
Owner HUAWEI TECH CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com