Ambisonic Gain Calculation for Low-Load Object Audio Rendering
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Solution Overview
Problem
The existing encoding systems for object audio, such as the MPEG-H Part 3:3D audio standard, generate 19 spread audio object signals for each audio object, leading to a significant increase in calculation loads during rendering processing.
Innovation Solution
A signal processing apparatus and method that directly calculates ambisonic gain based on spread information, eliminating the need to generate 19 spread audio objects, by using an ambisonic gain calculation unit to find ambisonic gain at a predetermined position and performing rotation processing to generate ambisonic signals from audio object signals, with the aid of a gain table for interpolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If 19 spread audio object signals are generated for one audio object to express audio object size, then the audio object size can be expressed, but the calculation load increases remarkably
Solution Approach 1:
The patent extracts only the essential spread information from the audio object metadata and uses it to calculate a single ambisonic gain value, rather than generating all 19 spread audio object signals. This selective extraction approach maintains the audio object size expression capability while eliminating unnecessary calculation operations.
Solution Approach 2:
The patent changes the parameter representation from generating multiple discrete audio object signals to calculating a continuous ambisonic gain value based on spread information. This parameter transformation reduces the dimensional complexity from 19 separate signals to a single gain parameter that can be applied to the ambisonic decoding process.
2Adaptability or versatility
If ambisonic data and object audio are handled together, then spatial acoustic information can be expressed, but the processing complexity increases
Solution Approach 1:
The patent merges the processing of ambisonic data and object audio by integrating the spread information from audio object metadata directly into the ambisonic decoding process. This combination allows spatial acoustic information to be expressed through a unified processing path that handles both data types simultaneously, reducing overall system complexity.
Solution Approach 2:
The patent creates a universal processing mechanism where the ambisonic gain calculation based on spread information serves multiple functions: it expresses audio object size, maintains spatial positioning accuracy, and integrates with ambisonic decoding. This multi-functional approach handles both ambisonic data and object audio through a single versatile process.
Data Source
AI summary
The present technology relates to a signal processing apparatus and method capable of reducing calculation loads, as well as a program.A signal processing apparatus includes an ambisonic gain calculation unit configured to find, on the basis of spread information of an object, an ambisonic gain while the object is present at a predetermined position. The present technology is applicable to an encoder and a decoder.