Audio Codec Side Information for Packet Loss Concealment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing audio encoding technologies face challenges in maintaining audio quality during packet loss in communication networks, particularly in CELP encoding, due to inconsistencies in adaptive codebooks and increased algorithmic delay, which degrades voice communication quality.
Innovation Solution
An audio coding system that includes an audio encoding device and method for encoding audio signals using side information calculated from a look-ahead signal, which encodes and transmits parameters like pitch lag and gain, and an audio decoding device that decodes and synthesizes audio signals using accumulated side information to recover audio quality without increasing algorithmic delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If packet loss concealment is performed by copying decoded audio signal from previously received packets, then implementation complexity is reduced, but audio quality degrades when audio properties change suddenly
Solution Approach 1:
The patent performs preliminary encoding of audio signals at the transmitting end before transmission, creating encoded audio data that can be used for packet loss concealment. This preliminary action allows the receiving end to reconstruct lost packets using the pre-encoded data without requiring complex real-time analysis, thus maintaining audio quality while reducing implementation complexity.
Solution Approach 2:
The patent introduces encoded audio data as an intermediary element between the original audio signal and the packet loss concealment process. This intermediary contains essential audio characteristics that facilitate accurate reconstruction of lost packets, bridging the gap between simple copying methods and high-quality reconstruction without requiring complex algorithms at the receiving end.
2Reliability
If side information is encoded and transmitted for packet loss concealment, then audio quality during packet loss improves, but communication bandwidth consumption increases
Solution Approach 1:
The patent extracts only the essential side information parameters needed for packet loss concealment from the full audio signal, such as key spectral characteristics and temporal features. By taking out only the critical elements rather than transmitting redundant data, the method maintains audio quality during packet loss while minimizing bandwidth consumption.
Solution Approach 2:
The patent transforms audio signal characteristics into compact parameter representations for transmission. By changing the form of the data from raw audio samples to condensed parameters, the system achieves efficient bandwidth utilization while preserving the essential information needed for accurate packet loss concealment and high audio quality.
3Adaptability or versatility
If audio packets are transmitted through communication network, then audio communication functionality is enabled, but packet loss and errors occur due to network congestion
Solution Approach 1:
The patent prepares encoded audio data and side information at the transmitting end before transmission occurs. This beforehand cushioning creates a buffer of preparatory work that can be used to reconstruct lost packets, cushioning against the reliability issues caused by network congestion and packet loss while maintaining audio communication functionality.
Solution Approach 2:
The patent uses copying of encoded audio data and parameters from previously transmitted packets to reconstruct lost packets at the receiving end. This copying mechanism enables recovery from packet loss without requiring retransmission, maintaining audio communication functionality despite network reliability issues.
Data Source
AI summary
An audio signal transmission device for encoding an audio signal includes an audio encoding unit that encodes an audio signal and a side information encoding unit that calculates and encodes side information from a look-ahead signal. An audio signal receiving device for decoding an audio code and outputting an audio signal includes: an audio code buffer that detects packet loss based on a received state of an audio packet, an audio parameter decoding unit that decodes an audio code when an audio packet is correctly received, a side information decoding unit that decodes a side information code when an audio packet is correctly received, a side information accumulation unit that accumulates side information obtained by decoding a side information code, an audio parameter missing processing unit that outputs an audio parameter upon detection of audio packet loss, and an audio synthesis unit that synthesizes decoded audio from the audio parameter.