Many thanks for your inputs Jerry!
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The Ono meter measurements were taken in 1987 using one of the world's first portable FFT analyzers. I should have mentioned that. Back then, the microphone was limited to 100 kHz (more than that, but not reliable). However, it seems to have been confirmed that the sound of the lava stone instruments was measured up to about 200 kHz and even higher.
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On Tue, Jan 7, 2025 at 08:43 PM, Jerry Lee Marcel wrote:
FFT analyzers going up to GHz are known, but the problem is with transducers. Typical microphones hardly go up to 200kHz. In order to measure "sounds" up to 500kHz, I believe the only way is to use constraint gauges or optical systems. Top lab work.
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You are absolutely right. According to the of the ULTRAMIC there are two versions available:
- 384 kHz sampling rate and 190kHz bandwidth
- 192 kHz sampling rate and 95kHz bandwidth
Resolution: 16bit
Microphone sensor: Dual SPU0410LR5H from Knowles
No high pass filter. It can record audio and ultrasound at the same
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On Tue, Jan 7, 2025 at 08:34 PM, Jerry Lee Marcel wrote:
Very likely, 384k is the sampling rate. Although teh Nyquist theorem induces that it can process signals up to 192kHz, most hardware cannot.
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