Recording apparatus coding circuit for an image signal and corresponding decoding circuit
US4001875A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1975 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Aug 5, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The image signal is divided into first and second component signals respectively occupying a lower and a higher frequency band, and the second component signal is translated into the lower frequency band by means of a modulator fed by an oscillator, after which the two component signals are alternately directed, each for the duration of a frame period, to the output of the circuit, bursts of the output signal from the oscillator being added, during the horizontal fly-back intervals, to the frequency translated signal. In the decoding circuit, which is designed to simultaneously receive the signals derived from two reading units, the second of which delivers the recorded signal time shifted by a frame period relatively to the other, the second component signal is retranslated into the higher frequency band by a modulator fed by an oscillator synchronised by mean of the recorded bursts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.