Processing of digital signals
US4284351A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1980 |
| Grant date | Aug 18, 1981 |
| Priority date | — |
| Expiry date | May 21, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P5/26
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of, and apparatus for, processing a digital electric signal composed of a train of discrete uniformly or non-uniformly shaped pulses to recover spectral information contained in the spacings between the pulses, in which the digital signal is applied to a SAW spectrum analyzer arranged to produce output signals the envelopes of which represent the power spectrum over a selected frequency range of constituent sample lengths of the digital signal, and the required spectral information then derived from these output signals, for example by integration thereof over a period of time. The technique may be used in conjunction with a laser Doppler velocity measurement system in which each pulse of the digital signal represents the detection of a photon scattered from a moving object or particle in a scattering volume illuminated by laser light, the spacing between the pulses containing information regarding the velocity of movement of the object or particles under observation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.