Apparatus for recording and/or reproducing video and audio signals
US4580174A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Nov 18, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8355
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video and audio signal recording apparatus includes a first frequency modulator in which a first audio signal to be recorded that may represent a stereophonic left channel modulates a first carrier to produce a first FM audio signal, and a first frequency convertor converts the carrier frequency of the first FM audio signal to a different carrier frequency higher than the first carrier frequency to form a second FM audio signal. A second frequency modulator modulates a second audio signal to be recorded that may represent a stereophonic right channel to produce a third FM audio signal, and a second frequency converter converts the third FM audio signal into a fourth FM audio signal having a carrier frequency that is higher than any of the other FM audio signals so modulated. The first and third FM audio signals are mixed to form a first mixed audio signal and the second and fourth FM audio signals are mixed to form a second mixed audio signal, which are both combined in a mixing circuit with a composite color video signal to form first and second mixed audio and video signals which are fed to first and second magnetic recording heads, respectively. Reproducing apparatus reproduce…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.