Loudspeaker Rectification via Signal Processing

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Solution Overview

Problem

Mass-produced loudspeakers in audio systems often deviate significantly from their reference counterparts, leading to performance variations, which existing technologies fail to reliably identify and rectify, especially in high-volume production settings like vehicle audio systems.

Innovation Solution

A method involving computer-based audio measurement systems that acquire performance data metrics for loudspeakers in a reference audio system, allowing for comparison and rectification of duplicate systems by applying additional or modified signal processing to ensure conformance within specified metrics thresholds, using microphones placed in predetermined locations and ambient condition monitoring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If mass-produced loudspeakers are manufactured with standard tolerances, then production cost and complexity are reduced, but acoustic performance varies significantly from reference systems

Engineering Contradiction:

Improveacoustic performance conformanceVSAvoidproduction process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by measuring and storing performance data from reference loudspeakers before mass production, then using this pre-established data to automatically rectify production loudspeakers. The reference system is characterized in advance, creating a template that guides subsequent production quality control without requiring complex real-time adjustments during manufacturing

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by measuring the acoustic performance of production loudspeakers, comparing it against stored reference data, and automatically applying rectification signal processing. This closed-loop feedback system continuously monitors and corrects performance deviations, ensuring production units match reference systems without increasing manufacturing complexity

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If loudspeaker performance is measured under varying ambient conditions, then measurement flexibility is improved, but measurement reliability and repeatability deteriorate

Engineering Contradiction:

Improvemeasurement flexibilityVSAvoidmeasurement repeatability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies universality by creating a measurement system that functions across varying ambient conditions through automatic environmental parameter tracking and compensation. The system adapts to different temperatures, humidities, and pressures while maintaining measurement reliability by adjusting reference comparisons based on recorded environmental data, making the measurement process universally applicable without sacrificing repeatability

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9668072B2Loudspeaker rectification method

Publication Date: 2017.05.30 HUTT STEVEN W

AI summary

Loudspeaker drivers used in audio systems are subject to performance variance caused by production deviation of components and assembly processes and consequently audio system performance is influenced by the mechanical attributes of individual loudspeaker drivers of which the audio systems are comprised. This invention provides a solution to minimize the variance of duplicate audio system performance by rectifying the signal processing to minimize loudspeaker variance in duplicated or mass production audio systems.