Apparatus and method to calibrate one or more transducers in a noisy environment
US6839197B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2002 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Mar 27, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5508
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method to calibrate a transducer, whereby the transducer provides a first signal, and whereby a reference provides a reference signal. The first signal is sampled at a sampling rate comprising a reference frequency, and a digital measured first signal waveform is formed. The reference signal is sampled at the sampling rate, and a digital measured reference signal waveform is formed. The real and imaginary components of the measured first signal waveform are determined at (P) harmonics of the reference frequency. A filtered first signal waveform is formed using those real and imaginary components. The real and imaginary components of the measured reference signal waveform are determined at (P) harmonics of the reference frequency. A filtered reference signal waveform is formed using those real and imaginary components. A transfer function is formed using the filtered first signal waveform and the filtered reference signal waveform. A calibration curve is formed using that transfer function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.