Wireless Earphone Noise Reduction via Electromagnetic Induction

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Solution Overview

Problem

Conventional wireless earphones have low noise reduction quality due to close microphone placement and interference from digital signal lines, leading to periodic noise and echo issues.

Innovation Solution

Each earphone in the wireless earphone system is equipped with multiple microphones and electromagnetically connected via coils, allowing for the determination of a to-be-denoised earphone based on audio signals and performing noise reduction processing using a filter when a voice feature is detected, eliminating the need for a connection line and reducing signal interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If microphones are arranged close to each other in the earphone to meet compact appearance requirements, then the device size is reduced, but noise reduction quality deteriorates due to signal interference and crosstalk

Engineering Contradiction:

Improveearphone sizeVSAvoidnoise reduction quality

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent replaces the traditional wired mechanical connection between earphones with electromagnetic induction coupling. Coils in each earphone generate magnetic fields that induce currents in the other earphone's coil, enabling wireless signal transmission without physical connection lines that cause crosstalk and interference.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces magnetic fields as an intermediary medium for signal transmission between earphones. The coils generate and respond to magnetic fields, allowing audio signals to be transmitted wirelessly through electromagnetic coupling without direct electrical contact, thereby eliminating line interference.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If connection lines are used to connect left and right earphones, then signal transmission is established, but periodic noise and echo are generated due to crosstalk between digital signal lines and mic line interference

Engineering Contradiction:

Improvesignal transmissionVSAvoidperiodic noise and echo

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the mechanical/wired signal transmission system with an electromagnetic field-based wireless transmission system. Audio signals are transmitted through electromagnetic induction between coils, eliminating the physical connection lines that generate crosstalk, periodic noise, and echo.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts and removes the physical connection lines from the earphone system. By eliminating the wires that connect left and right earphones, the source of crosstalk and interference is completely removed, allowing wireless electromagnetic coupling to handle signal transmission.

Inventive Principle:

Principle #2Taking out (Extraction)

3Loss of information

If the spk or mic is interfered by crosstalk between digital signal lines in the connection line, then signal transmission occurs, but noise reduction quality deteriorates due to periodic noise generation

Engineering Contradiction:

Improvesignal transmissionVSAvoidperiodic noise

Core Design Contradiction:

Loss of informationVSObject-generated harmful factors

Solution Approach 1:

The patent substitutes electromagnetic induction for wired signal transmission. Coils in each earphone create magnetic fields that induce corresponding currents in the other earphone, transmitting audio signals wirelessly without the digital signal lines that cause crosstalk and periodic noise.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This approach enhances noise reduction quality and user communication experience by eliminating signal line interference and allowing for accurate determination and processing of audio signals, resulting in high-quality signal transmission.

Implementation Method 1

the first electromagnetic signal is obtained by a coil inducing an audio signal acquired by a microphone in the slave earphone

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

receiving a first electromagnetic signal from a slave earphone, and converting the first electromagnetic signal to an audio signal

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11812208B2Wireless earphone noise reduction method and device, wireless earphone, and storage medium

Publication Date: 2023.11.07 GOERTEK INC

AI summary

A method and a device for reducing noise of a wireless-earphone, a wireless-earphone and a computer-readable storage medium are provided. In the method, a first electromagnetic signal from a slave earphone is received, and the first electromagnetic signal is converted to an audio signal. The first electromagnetic signal is obtained by a coil inducing an audio signal acquired by a microphone in the slave earphone. A to-be-denoised earphone is determined based on audio signals acquired by microphones in the earphones. It is determined whether an audio signal acquired by a microphone in the to-be-denoised earphone has a voice feature. Noise reduction processing is performed on the audio signal acquired by the microphone in the to-be-denoised earphone by using a filter in a case that the audio signal acquired by the microphone in the to-be-denoise earphone has the voice feature.