Audio Signal Decoding with Variable Bit Timeslot Positioning
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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, inefficient signal compression, and reduced transfer efficiencies caused by unnecessary information in spatial information signals.
Innovation Solution
The proposed solution involves an audio signal decoding apparatus that selectively includes a spatial information signal in a header and uses a variable bit number to represent the position of a timeslot for parameter application, reducing the information quantity required for downmix signal arrangement and mapping multi-channel audio signals to speakers efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If configuration information is inserted in an audio signal once and kept non-changeable, then the audio signal can be decoded with stable configuration, but the audio signal cannot be reproduced from random timing points
Solution Approach 1:
The configuration information is segmented into multiple independent header structures, each containing complete configuration data. This allows the decoder to access configuration information at any timing point by locating the nearest header, enabling random access while maintaining configuration completeness.
Solution Approach 2:
Configuration information is prepared in advance and inserted at regular intervals throughout the audio signal. This preliminary placement ensures that when random access is needed, the configuration data is already available at the required position without needing to process from the beginning.
2Reliability
If spatial information signal is always included in the bitstream, then complete spatial information is available for decoding, but signal compression and transfer efficiencies are reduced
Solution Approach 1:
The inclusion of spatial information signal in the bitstream is made dynamic rather than static. The spatial information is conditionally included based on whether it is necessary for the current decoding context, allowing the system to adapt between complete information and efficient compression as needed.
Solution Approach 2:
The parameter indicating whether spatial information is included is changed based on decoding requirements. When random access is needed or spatial effects are required, the spatial information parameter is set to include the data; otherwise, it is excluded to maximize compression efficiency.
3Ease of manufacture
If fixed bit number is used to represent timeslot position, then the structure is simple and easy to decode, but the information quantity is inefficient when timeslot positions vary
Solution Approach 1:
The bit number used to represent timeslot position is changed from fixed to variable based on the actual range and distribution of timeslot positions. When timeslot positions are concentrated in a small range, fewer bits are used; when they are spread out, more bits are allocated, optimizing the information quantity efficiency.
Solution Approach 2:
Instead of allocating enough bits to cover all possible timeslot positions (excessive action), the system uses variable bit allocation that provides just enough precision for the actual data range (partial action), reducing overall information quantity while maintaining decoding accuracy.
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.