Earpiece Induction Circuit for Stable Body-Conducted Audio

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Solution Overview

Problem

Wearable devices face communication challenges due to Bluetooth transmission failures, absorption of RF signals by soft tissues, interference, and instability in humid and water environments, leading to unacceptable signal drops and power limitations.

Innovation Solution

The system employs a combination of induction circuits for short-range communication and radio transceivers within earpiece housings, allowing for high-quality audio and data transfer through the human body, using near-field magnetic induction and Bluetooth/FM transceivers to maintain stable connections in various environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Bluetooth radio transmission is used for communication between earpieces, then wireless communication capability is achieved, but signal absorption by soft tissues and instability in humid environments occurs

Engineering Contradiction:

Improvecommunication stabilityVSAvoidRF signal absorption by soft tissues

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an induction circuit as an intermediary communication mechanism between earpieces, operating through magnetic field coupling rather than direct RF transmission through tissues. This mediator approach allows communication to occur through the skull bone structure which is less absorptive, bypassing the harmful RF absorption by soft tissues while maintaining reliable connection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the electromagnetic radio frequency system with an induction-based magnetic coupling system for short-range inter-ear communication. This substitution eliminates the RF absorption problem by using a different physical mechanism (magnetic induction through bone) rather than radio wave propagation through soft tissues.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If high power radio transmission is used to overcome signal absorption, then communication range is improved, but physiological acceptability and device stability deteriorate

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidtransmission power requirements

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent substitutes high-power RF transmission with low-power magnetic induction coupling. The induction circuit operates at significantly lower power levels because magnetic coupling through the skull is more efficient than RF propagation through absorbing soft tissues, eliminating the need for high power transmission while maintaining communication reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters from high-frequency RF transmission to lower-frequency magnetic induction. This parameter change allows communication to occur at much lower power levels while achieving better penetration through the skull structure, resolving the contradiction between power requirements and communication reliability.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If Bluetooth standard transmission is used for inter-ear communication, then wireless connectivity is achieved, but adaptation to anatomic demands and environmental conditions deteriorates

Engineering Contradiction:

Improveenvironmental stabilityVSAvoidanatomic adaptation

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the communication system into two distinct modes: induction circuit for short-range inter-ear communication and radio transceiver for external device connectivity. This segmentation allows each subsystem to be optimized for its specific function, with the induction circuit handling the challenging inter-ear anatomical path while the radio handles external communications.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a universal communication architecture that combines both induction and radio capabilities in each earpiece. This multi-functional design allows the system to adapt to different communication scenarios automatically, selecting the appropriate mode based on environmental conditions and anatomical requirements.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution enables high-bandwidth audio transmission with minimal signal deterioration, maintaining connectivity in humid and water-exposed conditions, and reduces the need for frequent recalibration and RF tuning, providing stable communication through the human body.

Implementation Method 1

The induction circuit may be a near field magnetic induction circuit or other type of induction circuit

Methodology Applied

Scientific EffectNear-field magnetic induction: Electromagnetic Induction

Data Source

PatentUS9755704B2Multimodal communication system induction and radio and method

Publication Date: 2017.09.05 BRAGI

AI summary

A system of wearable or personal area devices includes a first earpiece and a second ear piece each of the first ear piece and the second ear piece comprising an ear piece housing, an induction circuit disposed within the ear piece housing for short range communications, and a radio transceiver disposed within the ear piece housing for radio communications. The induction circuit of the first ear piece and the induction circuit of the second ear piece are adapted for communication there between using high bandwidth audio.