Picture-in-picture television receiver
US4725888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 5, 1987 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Jan 5, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4882
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A picture-in-picture type television receiver in which a sub-picture screen is provided within a main picture screen and the pictures on the main and sub-picture screens can be exchanged by a viewer operated control. According to this television receiver, when a command for exchanging the pictures is issued, if the picture displayed on the main picture screen is of a PAY channel (CABLE CHANNEL), the main and sub-channels cannot be exchanged with each other, and the exchange of the pictures is inhibited. The viewer is warned of this exchange inhibition for a predetermined time period. Thus, the user can utilize the television receiver more conveniently and is relieved of any anxiety when the pictures are inhibited from being exchanged with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.