Single Earphone Stereo Mono Audio Mixing Circuit

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Solution Overview

Problem

Individuals with unilateral hearing loss struggle to hear both stereo audio channels using existing headphones and earphones, which often require adapters that are cumbersome and prone to damage, or miss half the audio content when using monaural options.

Innovation Solution

A single earpiece headphone or earphone with a three-conductor plug that can be plugged into both stereo and monaural audio devices without adapters or sensing circuitry, allowing both audio channels to be heard together in a single earpiece.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a stereo-to-mono adapter is inserted to enable monaural hearing, then the ability to hear both audio channels is improved, but the device becomes cumbersome and prone to damage

Engineering Contradiction:

Improveability to hear both audio channelsVSAvoidadapter and earphone configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the adapter functionality directly into the earphone by using a single integrated component that combines both adapter and earphone functions. This eliminates the need for separate adapter and earphone pieces, reducing overall complexity while maintaining the ability to hear both audio channels through the single earpiece.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The earphone is designed with universal compatibility to work with both stereo and monaural audio devices through a single plug configuration. The three-conductor plug can interface with either stereo or monaural jacks, providing multi-functionality that eliminates the need for separate adapters for different audio device types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a stereo-to-mono adapter is used, then compatibility with monaural devices is improved, but the risk of damage to connectors increases

Engineering Contradiction:

Improvecompatibility with audio devicesVSAvoidconnector durability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

By integrating the adapter functionality into the earphone itself, the patent eliminates the need for separate adapter components that could snag on clothing or objects. The single integrated plug design reduces the number of connection points that could be damaged, thereby improving reliability while maintaining compatibility.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If a monaural earphone is used, then simplicity is improved, but the ability to hear both stereo channels is lost

Engineering Contradiction:

Improveearphone structureVSAvoidaudio channel content

Core Design Contradiction:

Device complexityVSLoss of information

Solution Approach 1:

The patent applies local quality by using different conductor configurations in different parts of the plug assembly. The three-conductor plug includes specific wiring arrangements that allow selective connection to stereo or monaural jacks, enabling the simple monaural earpiece structure to access both stereo channels when needed without increasing overall complexity.

Inventive Principle:

Principle #3Local quality

4Adaptability or versatility

If adapters are used to convert stereo to monaural, then functionality for single-ear hearing is improved, but the number of parts increases

Engineering Contradiction:

Improvesingle-ear hearing capabilityVSAvoidnumber of components

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent combines multiple functions into a single component: the earphone housing, the three-conductor plug, and the adapter functionality are all integrated into one unit. This eliminates the need for separate adapter components, reducing the total quantity of parts while maintaining the ability to provide single-ear hearing with both audio channels.

Inventive Principle:

Principle #5Merging (Combining)

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

Enables individuals with unilateral hearing loss to hear both stereo channels without adapters, reducing the risk of damage and allowing normal hearing individuals to keep one ear open for surroundings while listening to audio, enhancing safety and convenience.

Implementation Method 1

a three-conductor plug that can be plugged into both stereo and monaural audio devices without adapters

Methodology Applied

Scientific EffectElectrical signal transmission: Conduction (electrical)

Implementation Method 2

integrated speaker elements that drive audio into a listener's ears

Methodology Applied

Scientific EffectElectroacoustic conversion:

Data Source

PatentUS8666098B2Single earphone for stereo and monaural audio devices

Publication Date: 2014.03.04 SCAN SOUND

AI summary

A single Airbed style earphone employing a standard three-conductor stereo headphone plug is adapted to enable the use of one earpiece to hear the combined left and right channels of stereo audio in a single ear. The single Airbed invention employs a three-conductor plug and is wired in such a way that it may be used equally well with both stereo and mono audio devices without the need for any kind of adapter, switch or sensing circuit. A pair of resistors matches the impedance load of a stereo headphone set.