Vehicle Speaker Mutual Interference Compensation

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Solution Overview

Problem

In vehicles equipped with multiple speakers on a crush pad, mutual interference between speakers leads to distortion in sound output, particularly during accidents when emergency calls need to be prioritized.

Innovation Solution

A system comprising a first speaker, a second speaker, an amplifier, and a controller that detects current flow and compensates for movement between the speakers by supplying direct current to the second speaker and selectively disabling current to the first speaker during accidents, using pre-stored induced current information to determine accident conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple speakers are provided on the crush pad, then sound output coverage is improved, but sound distortion occurs due to mutual interference between speakers

Engineering Contradiction:

Improvesound output coverageVSAvoidsound output quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The controller detects current flowing through each speaker and uses this feedback to determine when mutual interference is occurring. Based on the detected current in the second speaker, the controller adjusts the output of the first speaker to prevent distortion, creating a closed-loop control system that maintains sound quality while using multiple speakers.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the operating state of speakers based on real-time conditions. The controller can switch between different operational modes: normal operation where both speakers work, and interference prevention mode where the first speaker's output is adjusted or stopped based on detected current levels and mutual interference conditions.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If current is supplied to both speakers simultaneously, then sound coverage is improved, but distortion occurs due to mutual influence between speakers

Engineering Contradiction:

Improvesound coverageVSAvoidsound output accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The detector continuously monitors current flowing through both speakers, providing feedback to the controller. When mutual interference is detected through current analysis, the controller adjusts the first speaker's output to maintain sound accuracy while preserving coverage through the second speaker.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The controller changes operational parameters of the first speaker based on detected conditions. When interference is detected, the controller modifies the current supply, output level, or operational state of the first speaker to eliminate distortion while maintaining overall sound coverage through coordinated speaker operation.

Inventive Principle:

Principle #35Parameter changes

3Power

If the first speaker operates at full power, then audio quality is improved, but it causes movement and interference in the second speaker

Engineering Contradiction:

Improvespeaker output powerVSAvoidspeaker movement interference

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The controller proactively prevents interference by monitoring current levels and adjusting the first speaker's output before significant distortion occurs. When detected current indicates potential mutual interference, the controller preemptively reduces or adjusts the first speaker's power output to prevent harmful effects on the second speaker.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The system uses current detection feedback to continuously monitor the operational state of both speakers. When the detected current indicates that the first speaker's full power operation is causing movement or interference in the second speaker, the controller adjusts the first speaker's output power to eliminate the harmful effect while maintaining acceptable sound quality.

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

Minimizes sound distortion by managing current supply to each speaker based on mutual influence, ensuring clear output from the second speaker during emergencies while preventing unnecessary noise from the first speaker.

Implementation Method 1

an amplifier configured to supply current to the first speaker and the second speaker

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a detector configured to detect the current of the first speaker and the current of the second speaker

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS11395082B2Vehicle and controlling method thereof

Publication Date: 2022.07.19 HYUNDAI MOTOR CO LTD

AI summary

A vehicle and a controlling method of the same controlling an output of a speaker based on a mutual influence between a plurality of speakers provided on a crush pad are provided. The vehicle includes a crush pad, a first speaker provided on the crush pad, and a second speaker provided on the crush pad and positioned on one side of the first speaker. An amplifier supplies current to the first speaker and the second speaker and a detector detects the current of the first speaker and the current of the second speaker. A controller is configured to compensate a movement of the second speaker caused by an operation of the first speaker based on an output of the detector when a current is supplied to the first speaker among the first speaker and the second speaker.