Institutional audio-visual system including a plural operating mode television receiver
US4319277A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1980 |
| Grant date | Mar 9, 1982 |
| Priority date | — |
| Expiry date | Jul 2, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/445
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An institutional television system includes a source of standard broadcast composite television signals, an auxiliary source of RF carrier signals conveying sound information exclusive of video information, and a television receiver. The television receiver selectably processes the composite television signal including the sync component thereof in a normal mode, and selectably processes the auxiliary signals in an audio mode. The receiver comprises a video signal processing channel that is similarly energized in both the normal and audio modes. The video channel is controlled to enable light output from the kinescope of the receiver when the video sync component is present in the normal mode, and to inhibit light output from the kinescope when the video sync component is absent in the audio mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.