Video signal recording and reproducing apparatus having a pre-emphasis and de-emphasis system for noise reduction
US4658305A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1984 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | Jul 26, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/83
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal recording and reproducing apparatus comprises a circuit for separating a luminance and carrier chrominance signals from a color video signal and for recording on and reproducing from a recording medium a multiplexed signal in which a frequency modulated luminance signal and a frequency converted carrier chrominance signal which is frequency-converted into a low frequency band are multiplexed, a circuit for obtaining a reproduced luminance signal, a circuit for obtaining a reproduced carrier chrominance signal which is in an original frequency band and has an original phase by subjecting a reproduced frequency converted carrier chrominance signal to a signal processing, a de-emphasis circuit supplied with the reproduced luminance signal and/or an input signal or the reproduced carrier chrominance signal of the processing circuit, for relatively attenuating the level of a high-frequency component in a temporal frequency of the reproduced luminance signal and/or an input signal or the reproduced carrier chrominance signal of the processing circuit compared to a low-frequency component, and a mixer for mixing the reproduced luminance signal and the reproduced carrier chr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.