Automatic tracking signal analyzer
US3978403A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1974 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | May 6, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/165
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method and apparatus for analyzing the harmonic distortion present in an input signal wherein first and second reference signals are generated differing by a small offset frequency. The first reference signal is mixed with the input signal to provide an intermediate carrier signal which is modulated with the second reference signal to provide a measurement carrier signal which in turn is modulated with the input signal to produce an output signal which is filtered to isolate a specific signal. By isolating a specific signal for each harmonic of the input signal to be analyzed, the proportion of each such harmonic is revealed as a percentage of the fundamental harmonic of the input signal. By adding a tunable oscillator to the apparatus, it may function as a wave analyzer, in which case the specific output signal represents the magnitude of any selected component of the signal to be analyzed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.