High-frequency channel selector having fixed bandpass filters in the RF section
US4408347A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1977 |
| Grant date | Oct 4, 1983 |
| Priority date | — |
| Expiry date | Jul 29, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/14508
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A high-frequency channel selector for a television receiver including at least one fixed filter having a predetermined passband, and a high-frequency mixer. The antenna for the television receiver receives radiated electromagnetic signals including, for example, a plurality of television channels. The fixed filter has an input coupled to the antenna and filters one fixed frequency spectrum of television channels from the received signals. The mixer has inputs coupled to simultaneously receive the fixed frequency spectrum of channels and mixing signals of a high selectable frequency. The high selectable frequency shifts selectable channels of the spectrum to high intermediate frequency substantially greater than 45 MHz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.