This test sequence demonstrates SoundCheck’s Triggered Record – Chirp Trigger function for open loop testing of devices without analog inputs such as smart speakers, wearables, smart home devices, tablets and cellphones. A stimulus WAV file is created in SoundCheck and transferred to the device under test, where it is played back and the response recorded in SoundCheck as if the stimulus were played directly from SoundCheck. The Acquisition step is triggered by the chirp in the stimulus file. Chirp triggers are more robust than level and frequency triggers which are susceptible to false triggering due to background noise.
This sequence characterizes the performance of transducers such as speakers, microspeakers and headphones by measuring how much voltage is required at each frequency to drive the transducer to specified limits of THD, Rub & Buzz, Perceptual Rub & Buzz or Compression. This is useful for detailed transducer analysis and determination of optimal power rating.
The user selects which metric is tested (one at a time is advised), the limit value and the stimulus start frequency. The sequence then uses an iterative looping process, initially with a +3dB step and then a +0.5dB step to precisely determine the value at which the limit is exceeded. This is repeated across the frequency range to generate curves of voltage and SPL vs frequency at the specified limit.
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