Parametric Equalizer Sound-Field Correction With Limited Bands

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Solution Overview

Problem

Existing sound-field correction devices face challenges in achieving precise correction when the number of bands in a parametric equalizer is small, as they fail to adequately consider the shape and barycenter of gain differences, leading to inadequate correction effects.

Innovation Solution

A sound-field correction device that calculates a target amplitude characteristic and auxiliary target amplitude characteristics with gentler or equal amplitude characteristics, groups them in the frequency domain, and sets a parametric equalizer based on calculated parameters to achieve effective sound-field correction, even with a limited number of bands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the number of bands in a parametric equalizer is reduced, then device complexity is decreased, but manufacturing precision of sound-field correction deteriorates

Engineering Contradiction:

Improvenumber of bandsVSAvoidcorrection precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent divides the sound-field correction process into multiple stages: first determining a target amplitude characteristic, then determining multiple auxiliary target amplitude characteristics with different resolutions, and finally synthesizing these to obtain the final correction amplitude characteristic. This segmentation allows each stage to focus on specific aspects of correction, achieving high precision even with limited equalizer bands.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an additional dimension of resolution by creating auxiliary target amplitude characteristics with different resolution levels (coarser and finer resolutions). This multi-resolution approach allows the system to capture both broad trends and fine details in the frequency response, enabling accurate correction with fewer bands.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of operation

If the number of bands in a parametric equalizer is small, then ease of operation is improved, but measurement precision of sound-field correction deteriorates

Engineering Contradiction:

Improveease of operationVSAvoidcorrection precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent performs preliminary calculations to determine the target amplitude characteristic and multiple auxiliary target amplitude characteristics before setting the parametric equalizer. This preliminary action includes analyzing the frequency response, identifying correction needs, and preparing correction parameters in advance, which enables accurate correction even with a limited number of bands.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes parameters by determining auxiliary target amplitude characteristics with different resolutions (coarser and finer) to capture various levels of detail in the frequency response. This parameter variation allows the system to optimize correction accuracy across different frequency ranges using fewer equalizer bands.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the number of bands in a parametric equalizer is reduced, then productivity is improved, but manufacturing precision of sound-field correction deteriorates

Engineering Contradiction:

Improveprocessing timeVSAvoidcorrection precision

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent segments the correction calculation into distinct phases: determining the target amplitude characteristic, determining auxiliary characteristics at different resolutions, and synthesizing the final correction. This segmentation allows efficient processing at each stage while maintaining overall correction precision, reducing total processing time even with limited bands.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by determining auxiliary target amplitude characteristics at coarser resolutions first to capture major correction trends, then adding finer resolution details where needed. This approach avoids unnecessary calculations across all frequency bands at full resolution, reducing processing time while maintaining correction accuracy.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS10270412B2Sound-field correction device, sound-field correction method, and sound-field correction program

Publication Date: 2019.04.23 FAURECIA CLARION ELECTRONICS CO LTD

AI summary

A sound-field correction device, comprising: a target calculating unit, a correction amplitude characteristic calculating unit and a setting unit. The target calculating unit calculates, based on a predetermined sound signal, a target amplitude characteristic targeted for sound-field correction by a parametric equalizer and a plurality of auxiliary target amplitude characteristics having amplitude characteristics approximately equal to or gentler than the target amplitude characteristic. The correction amplitude characteristic calculating unit calculates a correction amplitude characteristic for correction sound-field based on the calculated target amplitude characteristic and the calculated plurality of auxiliary target amplitude characteristics. The setting unit sets the parametric equalizer based on the calculated correction amplitude characteristic.