Audio Elevation Rendering Parameter Adjustment

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Solution Overview

Problem

When a multichannel signal, such as a 22.2 channel signal, is rendered into a 5.1 channel signal, distortion occurs in the sound image if the elevation angle of an input channel differs from the standard elevation angle, leading to inaccurate sound image representation.

Innovation Solution

A method and apparatus that modify elevation rendering parameters, including panning gains and elevation filter coefficients, by adding a predetermined delay to the frontal height input channel to maintain an elevated sound image at a reference elevation angle, preventing front-back confusion by generating an elevation-rendered surround output channel delayed with respect to the frontal height input channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If rendering parameters determined according to standard elevation angle are used, then the rendering process is simple, but distortion occurs in sound image when input channel elevation differs from standard

Engineering Contradiction:

Improverendering process simplicityVSAvoidsound image accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent implements dynamic adjustment of rendering parameters based on the actual elevation angle of input channels. The system detects whether the elevation angle exceeds a threshold and automatically switches between standard rendering parameters and compensated rendering parameters, making the rendering process adaptive rather than static.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the rendering parameters (specifically panning coefficients) based on the elevation angle of input channels. When the elevation angle exceeds the threshold, compensated rendering parameters are applied to maintain accurate sound image positioning, otherwise standard parameters are used.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If elevated sound image is maintained at reference elevation angle, then accurate sound representation is achieved, but front-back confusion occurs in surround channels

Engineering Contradiction:

Improvesound image representation accuracyVSAvoidfront-back confusion

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies different rendering strategies to different channel types. Frontal height channels receive elevated rendering to maintain accurate sound image positioning, while surround channels receive delayed rendering to prevent front-back confusion. This localized differentiation resolves the contradiction between accuracy and harmful effects.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces time delay as an intermediary parameter for surround channels. By adding a predetermined delay to surround output channels relative to frontal height input channels, the system mediates between the need for accurate elevation representation and the need to prevent front-back confusion.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If standard rendering parameters are used for all channels, then device complexity is low, but sound image distortion occurs when elevation differs from standard

Engineering Contradiction:

Improverendering system complexityVSAvoidsound image accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent implements a dynamic rendering system that adjusts parameters based on input channel characteristics. The system monitors elevation angles and automatically selects appropriate rendering parameter sets, achieving high sound image accuracy without requiring complex manual configuration or multiple dedicated processing paths.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10484810B2Method and device for rendering acoustic signal, and computer-readable recording medium

Publication Date: 2019.11.19 SAMSUNG ELECTRONICS CO LTD

AI summary

A method of elevation rendering an audio signal includes receiving multichannel signals including a height input channel signal of a predetermined elevation angle, obtaining first elevation rendering parameters for a height input channel signal of a standard elevation angle, obtaining a delayed height input channel signal by applying a predetermined delay to a height input channel signal, updating the first elevation rendering parameters based on the predetermined elevation angle, obtaining second elevation rendering parameters based on the label of the height input channel signal and labels of two output channel signals, and elevation rendering the multichannel signals and the delayed height input channel signal to output a plurality of output channel signals of an elevated sound image, based on the updated first elevation rendering parameters and the second elevation rendering parameters.