Time-Shifted Web Conferencing With Audio Quality Preservation
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Solution Overview
Problem
Current web conferencing systems lack the ability to enable participants to asynchronously observe a live meeting, forcing them to either miss initial content or wait until the meeting concludes to view recorded parts, and do not allow pausing or adjusting playback speed, leading to inefficiencies in scheduling and participant engagement.
Innovation Solution
A web conferencing system with time-shifting capabilities that allows participants to observe sessions in real-time, delayed, or after completion, and adjust playback speed while maintaining audio quality, using a server-client architecture for stream capture, compression, and decompression, and incorporating audio time-scale modification to ensure consistent audio aspects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If participants join a meeting at a designated time for real-time interaction, then real-time interaction quality is improved, but participants who join late must miss initial content or wait until the meeting concludes to view recorded parts
Solution Approach 1:
The system performs preliminary recording and storage of meeting content on the server as it occurs, making it immediately available for time-shifted access. This preliminary action of capturing and storing content allows late-joining participants to access and catch up on missed content without waiting for the meeting to conclude, resolving the contradiction between real-time interaction quality and ease of joining for late participants.
2Ease of operation
If participants observe meeting content in real-time, then interaction synchrony is improved, but participants cannot pause or replay content to deal with interruptions or review missed portions
Solution Approach 1:
The system dynamically adapts the content delivery mode based on participant needs. It provides real-time streaming for synchronous observation while also enabling time-shifted access with pause, replay, and speed adjustment capabilities. This dynamic flexibility allows participants to switch between real-time viewing and controlled playback, ensuring both ease of operation and reliable content comprehension.
Solution Approach 2:
The system changes the playback parameters of meeting content to accommodate different participant needs. It allows adjustment of playback speed, pausing, and replaying, transforming the fixed real-time stream into a flexible medium that can be manipulated to ensure reliable content comprehension while maintaining ease of operation.
3Productivity
If participants observe content at normal playback speed, then content delivery efficiency is improved, but participants cannot slow down the presentation to digest content more easily
Solution Approach 1:
The system allows participants to change the playback speed parameter of content delivery. By enabling speed adjustment, it simultaneously supports efficient content consumption for those who need speed while also allowing slowed-down playback for participants who need to digest content more easily, resolving the contradiction between productivity and ease of operation.
4Reliability
If web conferencing systems focus on real-time interaction, then interaction quality is improved, but scheduling efficiency deteriorates due to coordination requirements
Solution Approach 1:
The system performs preliminary recording of meeting content during the actual meeting, storing it on the server for later access. This preliminary capture action allows the meeting to proceed in real-time with high interaction quality while participants can access recorded content at their convenience, eliminating the need for strict scheduling coordination and improving scheduling efficiency.
Data Source
AI summary
A web conferencing system which, in one aspect has time-shifting capabilities. Session content is recorded so that participants are able to observe the session in real-time, delayed while the session is still in progress, or after the session has completed. Participants are also able to observe the session at normal, slower, or faster speeds, while maintaining substantially consistent perceived audio quality.