Active Noise Cancellation Device with Dynamic Distance Tracking

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Solution Overview

Problem

Conventional noise cancellation methods, such as using earplugs or earphones, can cause discomfort and distraction when used for extended periods, and existing noise cancellation technologies do not effectively mitigate noise in dynamic environments without causing counterproductive effects.

Innovation Solution

A noise cancellation device comprising a voice receiving module, a distance measuring module, and a speaker module that generates anti-noise signals to offset external noise, creating a moving noise reduction area around the user's ears by calculating distance information and synchronizing the anti-noise with the noise's phase, frequency, and amplitude.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If earplugs or earphones are worn to block noise, then noise isolation is improved, but user comfort deteriorates due to prolonged wear causing persecution

Engineering Contradiction:

Improvenoise isolationVSAvoiduser comfort

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent converts the harmful noise into a beneficial anti-noise signal through active noise cancellation technology. The voice receiving module captures external noise, the noise cancellation module generates an inverted phase signal, and the speaker module outputs this anti-noise to cancel the original noise, transforming the harmful acoustic environment into a comfortable listening experience without requiring physical earplugs or earphones

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent replaces the mechanical physical blocking method (earplugs/earphones) with an acoustic field-based active noise cancellation system. Instead of using mechanical barriers to isolate noise, the system uses electronic signal processing and acoustic wave interference to eliminate noise, thereby improving user comfort while maintaining noise isolation effectiveness

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If anti-noise is generated to offset external noise, then noise cancellation effectiveness is improved, but the noise reduction area must remain stationary while the user moves

Engineering Contradiction:

Improvenoise cancellation effectivenessVSAvoiddynamic environment adaptability

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic tracking of the user's ear position using a distance measuring module that continuously monitors the distance between the device and the user's ear. The noise cancellation module receives real-time distance information and dynamically adjusts the anti-noise signal generation accordingly, enabling the noise reduction area to move synchronously with the user and maintain effective noise cancellation in dynamic environments

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent establishes a feedback loop where the distance measuring module continuously measures the distance to the user's ear, feeds this information back to the noise cancellation module, which then adjusts the anti-noise signal in real-time. This feedback mechanism ensures the noise reduction area remains accurately positioned at the user's ear even during movement, improving both noise cancellation effectiveness and dynamic adaptability

Inventive Principle:

Principle #23Feedback

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively reduces noise distraction in noisy environments without causing discomfort, as the anti-noise generated by the device offsets external noise through destructive interference, ensuring the noise reduction area moves with the user.

Implementation Method 1

a voice receiving module configured to receive a noise

Methodology Applied

Scientific EffectAcoustic wave propagation: Sound

Implementation Method 2

The distance measuring module is configured to send a distance measuring signal to an object, and calculate distance information of the object according to a reflected distance measuring signal reflected by the object

Methodology Applied

Scientific EffectEcho: Echo

Implementation Method 3

the noise generated from external environment has been offset by the anti-noise generated by the speaker module

Methodology Applied

Scientific EffectDestructive interference: Interference

Data Source

PatentUS10262649B1Noise cancellation device and noise cancellation method

Publication Date: 2019.04.16 INVENTEC PUDONG TECH CORPOARTION

AI summary

A noise cancellation device includes a voice receiving module, a distance measuring module, a noise cancellation module and a speaker module. The voice receiving module is configured to receive a noise. The distance measuring module is configured to send a distance measuring signal to an object, and calculate distance information of the object according to a reflected distance measuring signal reflected by the object. The noise cancellation module is connected to the voice receiving module and the distance measuring module, and is configured to generate a reverse phase signal of the noise according to the noise. The speaker module is connected to the noise cancellation module, and is configured to generate an anti-noise according the reverse phase signal, and sound the anti-noise according to the distance information.