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Tuesday, November 16 • 19:30 - 20:20
(Replay) Synchronising Clocks - Simultaneous Audio Playback/capture on Multiple Interfaces, Devices And/or Networks

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Please note that the recordings on Zoom are Dual Mono and not Stereo - some pre-recorded sessions have been uploaded to YouTube to preserve the independent dual channel audio, but some sessions may still be affected.

We all know how to play/capture audio from a single audio interface with our favourite audio API. But how do you play/capture audio synchronously across multiple audio interfaces, computers, local networks or even the internet? The basic principle is always the same and can roughly be split into three distinct tasks:

1. Query the current presentation/capture time of each audio interface
2. Predict and convert between presentation/capture times of different clock domains using mathematical models
3. Control the playback/capture rate of each audio interface.

After a brief introduction, this talk will examine each of the above tasks in detail and how various algorithms and techniques apply to different synchronisation applications. The listener will benefit from a practical focus, by learning how various industry standards approach the problem (AVB, AirPlay, RTP, …), which APIs are available on different platforms and various practical considerations when using WiFi and/or ethernet as a transport to synchronise audio.

The talk will end with a case study on how the author helped achieve <10μs audio playback/capture synchronisation accuracy via WiFi on the Syng Cell Alpha.


avatar for Fabian Renn-Giles

Fabian Renn-Giles

Contractor & Consultant, Fielding DSP GmbH
Fabian is a freelance C++ programmer, entrepreneur and consultant in the audio software industry. Before this, he was staff engineer at ROLI Ltd. and the lead maintainer/developer of the JUCE C++ framework (www.juce.com) - an audio framework used by thousands of commercial audio software... Read More →

Tuesday November 16, 2021 19:30 - 20:20 GMT
Online 2
  Online Only
  • Level Intermediate, Advanced