| 1 | The pulse signals were processed by using the fast Fourier transforms. | |
| 2 | The raw sound is converted into sinusoidal frequency components via the mathematical process known as theFourier transform (FT). | |
| 3 | When they turned these measurements into a series of waves using a mathematical trick called a Fourier transform, the waves increased in magnitude as their frequency decreased. | |
| 4 | In this paper, with the Discrete Fourier Transform description of elements group curved surface, two kind of curved surface error are defined. | |
| 5 | The lens-less device is called a Planar Fourier Capture Array. It' s a flat piece of doped silicon. |