Reverberant Sound Adding Apparatus for Controlling Sound Density

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Solution Overview

Problem

Existing reverberant sound adding technologies fail to effectively control sound density while simulating acoustic characteristics of a prescribed space, leading to inadequate auditory impressions in various audio environments.

Innovation Solution

A reverberant sound adding apparatus that generates a modified impulse response by adding noise with random time intervals to an impulse noise, allowing for convolution with an input audio signal to control sound density, thereby simulating the acoustic characteristics of a space.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional reverberant sound adding techniques are used, then acoustic characteristics of a space can be simulated, but sound density of the reverberant sound cannot be controlled

Engineering Contradiction:

Improvesound density controlVSAvoidacoustic characteristics simulation accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The reverberant sound generation is divided into two independent components: (1) a convolution reverb section that preserves acoustic characteristics by convolving input signal with impulse response, and (2) a noise generation section that provides controllable sound density through adjustable probability parameters. This segmentation allows each component to optimize its function independently while combining to achieve both acoustic accuracy and density control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces a probability parameter (alpha) that controls the density of the impulse sequence in the generated noise. By adjusting this parameter, the sound density of the reverberant sound can be precisely controlled without affecting the acoustic characteristics simulation. This parameter change enables adaptive adjustment of reverberant sound density to match different music genres and spatial requirements.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If sound density of reverberant sound is increased, then densely packed impression is achieved, but sparseness required for certain music genres is lost

Engineering Contradiction:

Improveauditory impression controlVSAvoidmusic genre adaptability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The system dynamically adjusts the probability parameter (alpha) based on the input signal characteristics and desired output density. The probability of generating impulse components in the noise varies adaptively, allowing the reverberant sound density to be optimized for different music genres (e.g., high density for rock, low density for classical) while maintaining ease of operation through automated or manual parameter control.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If noise with random time intervals is added to impulse noise, then sound density control is achieved, but system complexity increases

Engineering Contradiction:

Improvesound density controlVSAvoidnoise generation system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention replaces complex mechanical or algorithmic noise generation systems with a simplified probabilistic approach. Instead of using sophisticated noise synthesis algorithms, the system uses a simple probability-based impulse sequence generator controlled by a single parameter (alpha), significantly reducing computational complexity while maintaining sound density control capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 precise control of sound density in reverberant sounds, enhancing the auditory experience by accurately reproducing the acoustic characteristics of a space, suitable for diverse audio environments such as theaters and concert halls.

Implementation Method 1

convolving an input audio signal with the modified impulse response

Methodology Applied

Scientific EffectImpulse response convolution: Reverberation

Data Source

PatentEP3026666B1Reverberant sound adding apparatus, reverberant sound adding method, and reverberant sound adding program

Publication Date: 2018.12.12 YAMAHA CORP

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AI summary

A reverberant sound adding apparatus includes a noise generator configured to generate a noise, an impulse noise generator configured to generate an impulse noise comprising an impulse sequence with random time intervals, an addition noise generator configured to generate an addition noise by adding the noise to the impulse noise, an impulse response generator configured to generate a modified impulse response by multiplying the addition noise by an amplitude characteristic of an impulse response that indicates acoustic characteristics of a space, and an impulse response convolver configured to convolve an input audio signal with the modified impulse response.