Audio Downmix Preset Matrix for Precise Object Level Control
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Solution Overview
Problem
Users face difficulties in directly controlling objects within a downmix signal and restoring optimal audio signal settings, especially in varying environments, due to the complexity of controlling multiple objects effectively.
Innovation Solution
An apparatus and method for processing audio signals that utilize preset information and rendering data, including a preset matrix, to adjust the level of objects in an output channel, allowing for precise control and efficient coding by determining the preset matrix based on output-channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If users directly control objects in a downmix signal, then control precision can be achieved, but operation complexity and difficulty increase significantly
Solution Approach 1:
The patent introduces preset information as an intermediary between the user and the complex object control system. Instead of directly controlling multiple objects with multiple parameters, users select from pre-configured preset information that automatically applies coordinated control settings, thereby maintaining control precision while dramatically simplifying operation.
Solution Approach 2:
The patent applies preliminary action by pre-configuring optimal control parameters and object settings in advance as preset information. These presets are prepared beforehand based on typical usage scenarios, allowing users to simply select from pre-optimized configurations rather than manually adjusting each parameter, thus achieving both precision and ease of use.
2Measurement precision
If multiple objects are controlled individually, then control accuracy can be maintained, but device complexity and processing overhead increase
Solution Approach 1:
The patent merges the control of multiple individual objects into a unified preset information structure. Instead of managing each object's parameters separately, the system combines multiple object control settings into integrated presets that can be applied collectively, reducing system complexity while maintaining the ability to control each object accurately when needed.
3Measurement precision
If detailed parameter information is transmitted for each object, then processing accuracy improves, but bitrate and data transmission requirements increase
Solution Approach 1:
The patent extracts only the essential and varying parameters from the complete object description, separating critical control information from redundant data. By transmitting only the necessary parameters that actually need adjustment rather than complete object specifications, the system maintains processing accuracy while significantly reducing bitrate requirements.
Solution Approach 2:
The patent uses preset information as a template or copy that contains pre-defined control parameters. Instead of transmitting full parameter sets for each object configuration, the system transmits references to preset templates that can be reused, thereby maintaining processing accuracy through template instantiation while minimizing data transmission through efficient copying rather than redundant transmission.
Data Source
AI summary
A method of processing an audio signal, and which includes a receiving object information including object level information indicating a level of objects, object gain information and object correlation information; receiving preset presence information and preset number information; receiving preset information based on the preset presence information and the preset number information by an audio decoding apparatus, the preset information including preset metadata representing an attribute mode of the preset information, preset rendering data and preset type information indicating whether the preset rendering data is in a matrix type or not obtaining a preset matrix from the preset rendering data by the audio decoding apparatus, and generating a processed audio signal by controlling a gain or panning of the at least one object included in the audio signal based on the downmix processing information.