Scalable Lossless Audio Coding Transmitter Architecture
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Solution Overview
Problem
Current audio signal processing systems face inefficiencies due to high computational resource demands when handling multiple audio channels at high sample rates, particularly in receivers that need to process signals with 128 or more channels at 96 kHz or higher, as existing methods either require significant resources for sample rate conversion or force all receivers to process low sample-rate signals.
Innovation Solution
A transmitter generates encoded audio signals at different sample rates using high-quality conversion methods, allowing receivers to decode only the necessary portions for their available computational resources, enabling efficient processing of audio signals at appropriate sample rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the transmitter converts to a sample rate that is low enough to be processed by the least-capable receiver, then the receiver can process the signal with limited computational resources, but all receivers are forced to process low sample-rate signals regardless of their computational capabilities and the quality of the original high sample-rate signal cannot be recovered
Solution Approach 1:
The encoded audio signal is segmented into multiple layers, each containing audio data at different sample rates. The transmitter encodes the original high sample-rate signal by combining a base layer (at lower sample rate) with enhancement layers (at higher sample rates). Receivers can selectively decode only the layers they need based on their computational resources, allowing low-capability receivers to process only the base layer while high-capability receivers can decode all layers to recover the full quality of the original high sample-rate signal.
Solution Approach 2:
The system dynamically adapts to different receiver capabilities by providing a scalable encoding structure. Each receiver determines its own processing requirements and selectively decodes the appropriate number of layers, making the system's behavior dynamic rather than static. This allows the same encoded signal to be efficiently processed by receivers with varying computational resources without forcing any receiver to process more data than necessary.
2Productivity
If the receiver converts its decoded audio signal to a lower sample rate as early in the decoding process as possible, then subsequent operations can be performed more efficiently, but the computational resources needed to perform a high-quality conversion would offset most if not more than the reduction achieved
Solution Approach 1:
The sample rate conversion is performed in advance during the encoding process at the transmitter, not during decoding at the receiver. The transmitter converts the original high sample-rate audio signal into a multi-layer encoded format where the conversion has already been done with optimal quality. This preliminary action eliminates the need for receivers to perform computationally intensive high-quality conversion operations, as the conversion work has already been completed and optimized at the transmitter with access to more computational resources.
3Adaptability or versatility
If the transmitter generates multiple versions of an encoded audio signal for different sample rates, then receivers can select appropriate versions, but this approach creates new problems in encoded signal distribution and storage
Solution Approach 1:
Instead of generating and distributing separate encoded audio signals for different sample rates, the transmitter merges all sample rate information into a single encoded signal structure. The encoded signal contains multiple layers that collectively represent the original high sample-rate audio, with each layer contributing to the overall quality. This merging approach allows a single encoded signal to serve multiple receiver types without creating distribution and storage complexity associated with managing multiple separate signal versions.
Data Source
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AI summary
A transmitter in an audio coding system generates an encoded audio signal that conveys a losslessly encoded representation of an audio signal at a first sample rate and losslessly encoded representations of related audio information at other sample rates. A companion receiver with limited computational resources can generate a high-quality output audio signal at a desired sample rate by losslessly decoding the encoded representation of the audio signal and possibly other portions of the encoded audio signal as needed to obtain an output signal at one of the other sample rates.