Audio Synchronization via Common Clock and Reference Track
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in synchronizing audio streams from multiple sources over the internet in real-time, especially in scenarios where multiple parties are interacting simultaneously, leading to noticeable delays and data loss.
Innovation Solution
A system that utilizes a reference track and a common clock provided by a server to synchronize audio streams from multiple performers. The server reconstructs and synchronizes the audio data received from the performers, which is then combined and adjusted in real-time by a mixer before being broadcast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio data is transmitted over the internet using standard network protocols, then the system can handle varying distances and network speeds, but delays and data loss occur that prevent real-time synchronization
Solution Approach 1:
The system pre-synchronizes clocks among all participants before the performance using NTP or PTP protocols. This preliminary clock synchronization ensures that when audio data is transmitted over the network, all participants have a common time reference, allowing for accurate timestamp comparison and compensation of network delays without requiring real-time clock adjustments during the performance.
Solution Approach 2:
The patent replaces traditional mechanical synchronization methods (such as starting a metronome together or using visual cues) with an electronic timestamp-based system. Each audio packet carries a timestamp generated from a common clock reference, allowing the receiving end to automatically calculate and compensate for network delay by comparing timestamps, thus eliminating the need for mechanical coordination among participants.
2Productivity
If multiple parties transmit audio simultaneously over the network, then collaborative performance is enabled, but synchronization becomes increasingly difficult as the number of participants increases
Solution Approach 1:
The system uses a universal timestamp protocol that works regardless of the number of participants. Each participant's audio stream is tagged with timestamps from a common clock reference, and the mixing server processes all streams using the same synchronization algorithm. This universal approach allows the system to scale from 2 to 100+ participants without increasing synchronization complexity, as the same timestamp comparison and delay compensation mechanism applies to each additional participant.
3Speed
If audio packets are transmitted as generated, then real-time transmission is achieved, but packets arrive out of order or are lost due to network variability
Solution Approach 1:
The system implements feedback mechanisms where the mixing server monitors incoming audio packets for gaps in the timestamp sequence. When packets are detected as lost or arrived significantly out of order, the server requests retransmission of those specific packets. This selective feedback approach maintains real-time transmission by only requesting retransmission when necessary, rather than waiting for entire audio frames, thus balancing speed and reliability.
Data Source
AI summary
A method and apparatus for synchronizing audio streamed over a network. The system makes use of a reference track and a common clock that is provided by a server to all participating performers. The performers perform along with and to the reference track wherein the reference track and common clock serve as a baseline reference for all the performers in regard to their audio transmitted to the server. Using the reference track and common clock, the server of the system can reconstruct and synchronize received audio from all the participating performers. The synchronized audio is then provided to a mixer where it is combined and live or real-time adjustments to the audio are made before being provided for broadcast.