Audio Signal Processing Apparatus for Multi-Channel Object Gain Control
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Solution Overview
Problem
Existing audio signal processing technologies face challenges in controlling gain and panning of objects, particularly in identifying and managing multichannel objects within downmix signals to prevent sound quality distortion during gain adjustments and ensuring compatibility across different decoding schemes.
Innovation Solution
The method involves extracting extension type identifiers from bitstreams to determine the presence of multi-channel objects, extracting and transmitting appropriate spatial information, and using this information to generate either multi-channel or normal object signals based on mode settings, thereby enabling controlled processing of downmix signals to maintain sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gain adjustment is applied to multichannel objects without proper identification, then processing efficiency is improved, but sound quality distortion occurs
Solution Approach 1:
The patent applies preliminary action by extracting and identifying multichannel object information from the bitstream before performing gain adjustment. The audio processing apparatus retrieves spatial information and object type identifiers in advance, determines whether objects are multichannel objects, and prepares appropriate processing parameters before the actual gain adjustment occurs, thereby preventing sound quality distortion while maintaining processing efficiency
2Reliability
If spatial information is extracted for all objects, then sound quality control is improved, but processing complexity increases
Solution Approach 1:
The patent applies local quality by selectively extracting spatial information based on object type. The apparatus identifies multichannel objects through type identifiers and extracts detailed spatial information (such as pan law, channel level difference, and channel correlation) only for those specific objects that require it, rather than processing all objects uniformly. This targeted approach maintains sound quality control for multichannel objects while reducing overall processing complexity
3Reliability
If multichannel objects are identified and processed separately, then sound quality is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing objects into different categories based on their type identifiers - specifically separating multichannel objects from regular objects. The audio processing apparatus extracts type information from the bitstream, identifies multichannel objects through specific identifier patterns, and processes them with dedicated spatial information extraction and gain adjustment algorithms, while handling regular objects through standard processing paths
Data Source
AI summary
An apparatus for processing an audio signal and method thereof, comprising receiving a downmix signal comprising at least one normal object signal, and bitstream including object information determined when the downmix signal is generated; extracting extension type identifier indicating whether the downmix signal further comprises a multi-channel object signal, from extension part of the bitstream; when the extension type identifier indicates that the downmix signal further comprise multi-channel object signal, extracting first spatial information from the bitstream; and, transmitting at least one of the first spatial information and the second spatial information; wherein the first spatial information is determined when a multi-channel source signal are downmixed into the multi-channel object signal, wherein the second information is generated using the object information and mix information, are disclosed.