Detector circuits
US4045743A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1976 |
| Grant date | Aug 30, 1977 |
| Priority date | — |
| Expiry date | Apr 22, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/153
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A waveform-level detector circuit is described for use in conjunction with waveforms showing positive and negative excursions about a neutral axis, the waveform trace crossing the axis between positive and negative peaks. Ideally, each axis crossing has significance, but the presence of noise produces spurious crossings and the circuit is arranged to accept as significant only an axis crossing which occurs in a single transition of the waveform trace between reference levels on either side of the axis. However, in detecting such a crossing, its actual timing is not accurately registered, so the apparatus also produces a timing response accurately related to all crossings, significant or not, and then combines this response with accepted crossing signals to derive a final output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.