Television receiver having an AGC circuit to control the gain on a tuner
US6333765A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Aug 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/52
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television receiver includes an input terminal (12). Through the input terminal is inputted an input signal having a predetermined electric field intensity. That is, a tuner (14) converts the input signal into a video intermediate frequency signal and audio intermediate frequency signal. The video intermediate frequency signal is amplified by a video intermediate frequency amplifier circuit (16). Based on that frequency, a filter (26) outputs a detection signal (Va). An RF-AGC circuit (32) outputs a reference voltage (Vref). An RF-AGC circuit (30) creates a control voltage (Vb) in response to a difference between the detection signal and the reference voltage. The tuner is controlled in gain by this control voltage. The reference voltage is varied by a micro-computer (36) depending upon the control voltage. Accordingly, the control voltage is adjusted to a desired voltage value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.