Hotel/motel power load control and bilateral signalling apparatus
US4360828A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1978 |
| Grant date | Nov 23, 1982 |
| Priority date | — |
| Expiry date | Aug 7, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/173
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Head end apparatus delivers video signals, e.g., premium and standard television programming to distinct locations such as hotel/motel rooms, an apartment or the like via a common MATV cable. The head end also transmits digital messages to receivers at each room location which are recovered via a phase detector and supplied to predetermined appropriate output utilization apparatus via a multiplexer and microprocessor. Similarly, messages generated at each room are transmitted upstream to the head end via the cable, employing a portion of the phase detector apparatus. In accordance with varying aspects of the present invention, the bilaterally propagating digital messages may comprise status controls for controlled equipment, e.g., electrical loads; and/or may comprise a data exchange for a communications application. Further, the room transmission apparatus is adapted to fail, if at all, in a noninterfering mode which does not comprise overall system operability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.