ADPCM Bitstream Audio Processing Without Tandem Decoding
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Solution Overview
Problem
ADPCM-coded signals require costly and complex tandem decoding and re-encoding processes for signal processing, leading to quality degradation and increased complexity, which is prohibitive for certain equipment and terminals, especially in scenarios where complete decoding is not feasible.
Innovation Solution
A method to process ADPCM-coded audio signals directly from the bitstream by determining an estimated signal based on quantization indices, allowing for the extraction of uncoded parameters without decoding, using adaptation parameters to calculate the estimated signal, and performing processing operations in the coded domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ADPCM-coded signals are processed by tandem decoding and re-encoding, then signal processing can be performed, but complexity and computational cost increase significantly
Solution Approach 1:
The invention extracts and processes only the necessary parameters (quantization indices and adaptation parameters) from the ADPCM bitstream without performing complete decoding. This selective extraction enables specific signal processing operations while avoiding the computational burden of full tandem decoding and re-encoding, thereby reducing complexity while maintaining processing capability.
2Ease of operation
If ADPCM-coded signals are processed by tandem decoding and re-encoding, then signal processing can be performed, but processing time increases due to multiple operations
Solution Approach 1:
The invention extracts only the essential quantization indices and adaptation parameters from the ADPCM bitstream, enabling direct processing in the coded domain. This avoids the time-consuming tandem decoding and re-encoding operations, significantly reducing processing time while maintaining signal processing capability.
3Ease of operation
If ADPCM-coded signals are processed by tandem decoding and re-encoding, then signal processing can be performed, but quality degrades due to multiple coding operations
Solution Approach 1:
The invention extracts and processes parameters directly from the ADPCM bitstream without complete decoding, avoiding the quality degradation associated with tandem coding operations. By working in the coded domain with quantization indices and adaptation parameters, the signal maintains its original quality while still enabling necessary processing operations.
4Ease of operation
If complete decoding is performed for signal processing, then processing can be done, but equipment cost increases for certain terminals
Solution Approach 1:
The invention extracts and processes only the necessary quantization indices and adaptation parameters from the ADPCM bitstream, enabling signal processing without complete decoding. This approach allows equipment with limited computational resources to perform processing operations, reducing equipment costs for certain terminals while maintaining processing capability.
Data Source
AI summary
A method for processing an encoded audio signal in a binary stream by MICDA predictive coding. The method includes the following steps: determining a signal assessed from quantification indices of the binary stream; determining unencoded parameters representative of the audio signal from the assessed signal; and processing the encoded audio signal using the determined parameters. Also provided is a device implementing the method.