Audio Signal Decoding Apparatus with Selective Spatial Information
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Solution Overview
Problem
Existing audio signal decoding technologies face challenges in reproducing audio signals from random timing points due to non-changeable configuration information, inefficiencies in signal compression and transfer caused by unnecessary information in spatial information signals, and the need for efficient representation of parameter sets and speaker mapping.
Innovation Solution
The proposed solution involves an audio signal decoding apparatus that selectively includes a spatial information signal in the header, uses a variable bit number to represent the position of a timeslot for parameter sets, and minimizes the information quantity required for downmix signal arrangement and speaker mapping by separating the audio descriptor, downmix signal, and spatial information signal, allowing for flexible header inclusion and efficient bit representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If configuration information is inserted in the audio signal once, then the audio signal structure is simplified, but the audio signal cannot be decoded from random timing points
Solution Approach 1:
The audio signal is segmented into multiple frames, with configuration information selectively inserted in the header of specific frames. This allows the decoder to synchronize at frame boundaries while maintaining a simplified overall structure, resolving the contradiction between structural simplicity and random access capability.
Solution Approach 2:
Configuration information is preliminarily inserted in the header of selected frames before decoding occurs. This preliminary placement enables the decoder to acquire necessary configuration data at specific timing points, allowing random access while maintaining structural efficiency.
2Loss of information
If spatial information signal is always included, then complete audio information is preserved, but compression and transfer efficiencies are reduced
Solution Approach 1:
The spatial information signal is selectively included in the header of specific frames rather than uniformly across all frames. This local differentiation preserves necessary audio information where needed while reducing overall data quantity, thereby improving compression and transfer efficiency without sacrificing information completeness.
Solution Approach 2:
Instead of including spatial information in every frame (excessive action), the invention includes it only in selected frames (partial action). This partial inclusion is sufficient for maintaining audio quality while significantly reducing the total information quantity, thus improving efficiency.
3Device complexity
If fixed bit number is used for timeslot position representation, then decoding is simplified, but bit representation efficiency is reduced
Solution Approach 1:
The bit number for representing timeslot position is made dynamic rather than fixed. The variable bit number adapts to the actual position information requirements, using more bits only when necessary and fewer bits when the position can be represented with less information, thus improving bit representation efficiency while maintaining manageable decoding complexity.
4Measurement precision
If downmix signal arrangement is performed, then speaker mapping accuracy is improved, but information quantity required increases
Solution Approach 1:
The invention extracts and utilizes essential arrangement information from the audio signal to determine speaker mapping, rather than requiring complete downmix signal arrangement data. This extraction approach maintains speaker mapping accuracy by focusing on critical information while reducing the overall information quantity required.
Data Source
AI summary
The invention relates to a method for decoding an audio signal, to allow an audio signal to be compressed and transferred more efficiently. The inventive method comprises steps of receiving an audio signal with spatial information signal, obtaining location information using the number of time slot and parameter of audio signal, establishing a multi-channel audio signal by applying spatial information signal to down-mix signal, and performing a multi-channel array for a multi-channel audio signal in response to the output channel.