Open-Ear Speaker Frequency Division to Prevent Sound Breakage

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Solution Overview

Problem

Acoustic devices experience sound breakage due to thin diaphragms in high-frequency speakers when receiving low-frequency signals, affecting listening quality and user experience.

Innovation Solution

A sound output device with a frequency-dividing circuit that suppresses low-frequency signal components below a specific frequency, preventing high-frequency speakers from receiving them, and includes a housing and support structure to position near the ear canal without blocking it.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single electrical signal drives multiple speakers with different frequency bands, then the system structure is simple, but sound breakage occurs in high-frequency speakers when receiving low-frequency signals

Engineering Contradiction:

Improvesignal driving systemVSAvoidsound output quality

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent divides the single electrical signal into multiple frequency-band-specific signals using a frequency division circuit. Each speaker receives only the signal within its optimal frequency range, preventing the high-frequency speaker from receiving low-frequency signals that cause sound breakage. This segmentation resolves the contradiction by maintaining simple system structure while improving sound output quality through signal separation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The frequency division circuit acts as an intermediary between the single electrical signal source and the multiple speakers. It processes the incoming signal and distributes appropriate frequency components to each speaker, preventing harmful low-frequency signals from reaching the high-frequency speaker while maintaining the simplicity of the overall system architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the diaphragm of the high-frequency speaker is made thinner to improve high-frequency response, then the frequency response is improved, but sound breakage occurs when receiving low-frequency signals

Engineering Contradiction:

Improvefrequency responseVSAvoidsound breakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The frequency division circuit performs preliminary action by filtering out low-frequency signal components before they reach the high-frequency speaker. This prevents the harmful low-frequency signals from causing sound breakage in the thin diaphragm, allowing the speaker to maintain its thin diaphragm design for improved high-frequency response without suffering from low-frequency-induced sound breakage.

Inventive Principle:

Principle #9Preliminary anti-action

3Object-affected harmful factors

If the ear canal opening is blocked to improve sound isolation, then sound isolation is improved, but natural hearing and comfort are reduced

Engineering Contradiction:

Improvesound isolationVSAvoidear canal openness

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The patent extracts only the necessary acoustic functions from the traditional earplug design. Instead of completely blocking the ear canal, the device positions the housing near the ear canal opening to provide sound isolation while leaving the ear canal open for natural hearing. This extraction of the essential sound isolation function without the harmful blocking effect resolves the contradiction between sound isolation and ear canal openness.

Inventive Principle:

Principle #2Taking out (Extraction)

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

Prevents sound breakage in high-frequency speakers by attenuating low-frequency signals, ensuring better listening quality and user experience while maintaining ear canal openness.

Implementation Method 1

a frequency-dividing circuit configured to perform a frequency division process on an excitation signal to generate the first electrical signal

Methodology Applied

Scientific EffectFrequency division: Filter (electronic)

Implementation Method 2

a first speaker configured to generate a sound in a first frequency band in response to receiving a first electrical signal

Methodology Applied

Scientific EffectElectromagnetic transduction: Electromagnetic Induction

Data Source

PatentUS20260046562A1Sound output devices

Publication Date: 2026.02.12 SHENZHEN SHOKZ CO LTD

AI summary

A sound output device is provided. The sound output device includes: a first speaker configured to generate a sound in a first frequency band in response to receiving a first electrical signal; a frequency-dividing circuit configured to perform a frequency division process on an excitation signal to generate the first electrical signal, wherein the frequency-dividing circuit is configured to: suppress signal components of the excitation signal with frequencies lower than a frequency-dividing frequency, so that a signal component of the first electrical signal with a frequency lower than a sound breaking frequency of the first speaker is attenuated by a preset amplitude compared to a signal component of the excitation signal with a frequency lower than the sound breaking frequency; a housing configured to accommodate the first speaker and the frequency-dividing circuit; and a support structure configured to place the housing at a position near an ear canal opening of a user without blocking the ear canal opening of the user.