100 Things #40: Synchronize Multiple Signal Generators

SoundCheck’s signal generator is a virtual instrument for playing signals (frequency, white or pink noise, .wav files or .wfms) out of any signal path in SoundCheck. But did you know that multiple signal generators can be used simultaneously in SoundCheck and even synchronized or delay offset, both in a sequence and for offline measurements. In this short video, we explain why this is useful.

Synchronizing Multiple Signal Generators in SoundCheck

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Video Script: Synchronize Multiple Signal Generators

SoundCheck’s signal generator is a virtual instrument for playing signals (frequency, white or pink noise, .wav files or .wfms) out of any signal path in SoundCheck. But did you know that multiple signal generators can be used simultaneously in SoundCheck and even synchronized or delay offset, both in a sequence and for offline measurements. This has many audio test applications, let’s take a look…

When more than one signal generator is opened, a sync checkbox is available. When more than one signal generator is synchronized, the signal generators with the checkbox checked, will be phase-locked to each other and when clicking Play on one signal generator, all signal generators will start playing simultaneously . This might be useful, for example, when playing back a binaural or multi-channel recorded wav file that requires synchronization and needs to be analyzed in parallel with the multi-channel Real Time Analyzer.

It can also be used, for example,  to play back pink noise to the left and right ears of a headphone, using the RTA to monitor the spectrum of the left and right ear simulators . You might perform this test, prior to running a full headphone test sequence to assure equal level balance and a tight seal on the left and right ears

While the Signal Generator defaults to sample accurate playback, with SoundCheck 20 or later, you can set delays between signal generator destinations, to make sure signals from different generators are not in phase or are playing in a sequenced manner. For example, maybe you want to simulate a background noise environment by playing back a .wav file to multiple background noise speakers. You can target up to 64 simultaneous channels with different Signal Generators each with its individual configuration. We even have an ETSI ES 202 396-1 background noise generation test sequence available to save setup time if you need to do these types of tests .

As you can see, multiple signal generators have a whole host of applications ranging from synchronized headphone tests to background noise generation and sequenced playback. For more information, ask your sales engineer for a demo.