100 Things #6: Open Loop Testing of Smart Devices Using Triggered Record

Triggered record is an essential feature for open loop audio tests – any test where the stimulus and response are asynchronous. This includes, for example measuring smart devices, automotive systems, or anywhere that signals travel wirelessly via Bluetooth or the cloud. In this short video, we review the three different triggered record options in SoundCheck.

Open Loop Testing of Smart Devices Using Triggered Record

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Video Script:

Triggered recording is an essential feature for open loop audio tests – any test where the stimulus and response are asynchronous. This includes, for example measuring smart devices, automotive systems, or anywhere that signals travel wirelessly via Bluetooth or the cloud.

Triggered record was first introduced into SoundCheck in 2007 but did you know that there are now three triggered record options available in SoundCheck? 

Lets take a quick look…

The level trigger is the simplest implementation of this feature.  The user selects the signal path, trigger level and record duration and once the level is exceeded, the step will record for the prescribed duration.

Level triggers can be error prone and for this reason the level and frequency trigger was developed and introduced in 2017.  In order to begin recording, not only does the level need to be exceeded but a sinewave must also be detected. In this case, the stimulus should be prepended with a pilot tone.

The third option, a level and cross-correlation trigger is the most accurate.  This method uses  a chirp-based conditioning tone and searches for the exact sweep range, making it more robust and less susceptible to false triggers than the simpler level and frequency options.