Adaptive Buffering Policy for Live Audio Streams
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Solution Overview
Problem
VoIP systems face challenges in managing delays in digital audio data processing, leading to potential data loss and poor voice quality due to buffering issues, especially under adverse network conditions.
Innovation Solution
An adaptive subscriber buffering policy that monitors buffer delays and implements re-sampling of multimedia data to reduce persistent delays, allowing for efficient data transmission and improved voice quality by adjusting buffer management based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wider buffer is used to provide higher resilience to bandwidth and latency fluctuations, then reliability is improved, but the buffering time before audio playback increases
Solution Approach 1:
The patent implements dynamic buffer management by continuously monitoring buffer depth and adjusting playback rate accordingly. The system transitions between different playback modes (normal playback when buffer is full, catch-up playback when buffer is low) based on real-time buffer conditions, allowing the buffer to adapt its behavior dynamically rather than using a fixed static buffer size.
Solution Approach 2:
The system changes the playback rate parameter based on buffer depth. When the buffer depth falls below a threshold, the playback rate is increased to catch up on lost audio data. This parameter adjustment allows the same buffer to provide both resilience and low latency by adapting its operation to current network conditions.
2Speed
If a small buffer is used to provide nearly instantaneous playback, then speed is improved, but vulnerability to adverse network channel conditions increases
Solution Approach 1:
The system continuously monitors buffer depth and uses this feedback to adjust playback behavior. When the buffer becomes low, the system detects this condition and automatically increases playback rate to prevent data loss. This feedback mechanism allows a small buffer to maintain both speed and reliability by reacting to network conditions in real-time.
Solution Approach 2:
Rather than using a fixed small buffer, the system dynamically adjusts its operation based on buffer depth. The buffer remains small for speed but activates catch-up playback when network conditions deteriorate, effectively becoming more resilient when needed without compromising normal playback speed.
3Device complexity
If buffer monitoring occurs over a configurable time interval, then device complexity is reduced, but measurement precision of delay levels decreases
Solution Approach 1:
The system monitors buffer depth at discrete time intervals rather than continuously, which simplifies the monitoring mechanism. By checking buffer depth at these intervals, the system achieves sufficient precision for practical purposes without the complexity of continuous monitoring, accepting that the measurement is approximate but adequate for triggering playback rate adjustments.
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for an adaptive subscriber buffering policy with persistent delay detection for live audio streams. In one aspect, a method includes decoding frames of multimedia data received from a first network; storing the decoded frames of multimedia data in a buffer; monitoring the buffer to determine a level of delay; and providing an output, based on the monitoring of the buffer, to cause a reduction in the level of delay during retrieval and encoding of the stored frames of multimedia data.