Continuous tuning arrangement for a multiband television receiver
US4249256A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1978 |
| Grant date | Feb 3, 1981 |
| Priority date | — |
| Expiry date | Nov 30, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J5/244
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A television tuning system for generating a tuning voltage for a varactor controlled local oscillator includes a continuous resistive element having first, second, third and fourth points along its resistive path which define first, second and third resistive sections corresponding, respectively, to the low VHF, high VHF and UHF tuning bands and a movable contact. A position detecting arrangement determines the position of the movable contact along the path of the resistive element to determine which band is being tuned and in response selectively couples voltages corresponding to the magnitudes of the tuning voltage corresponding to the beginning and end points of the various bands to respective points along the resistive element. As a result, with continuous motion of the movable contact a tuning voltage for each channel in the television range is developed at the movable contact.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.