Apparatus for demodulating sub-nyquist sampled video signal and demodulating method therefor
US4979037A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus (MD) for reproducing, by a low-frequency replacement method, a noise-free high definition video (MUSE) signal obtained by band-compressing the high definition video signal in a time-compressed integration Sub-Nyquist encoding system so as to include no aliasing noise in a low-frequency component below 4 MHz. This reproducing apparatus includes a converter (3) for converting a reproduced or received MUSE signal into digital data and a memory (7) for outputting feedback data in which preceding by two fields and data preceding by four fields with respect to the current field are alternately arranged, a circuit (6; 33) for replacing/non-replacing the data preceding by four fields by first data corresponding to the current field data from the current field data and the feedback data and deriving a data train in which the first data and the data preceding by two fields are alternately arranged. Output from the data train deriving circuit is employed to be converted to composite data by a mixture 11, and a circuit (LC) for replacing the low-frequency component of the current field data or the first data with the low-frequency component of the composite data. The reproducing a…
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