FI873138A - AVSTAEMNINGSSYSTEM FOER EN MOTTAGARE. - Google Patents
AVSTAEMNINGSSYSTEM FOER EN MOTTAGARE. Download PDFInfo
- Publication number
- FI873138A FI873138A FI873138A FI873138A FI873138A FI 873138 A FI873138 A FI 873138A FI 873138 A FI873138 A FI 873138A FI 873138 A FI873138 A FI 873138A FI 873138 A FI873138 A FI 873138A
- Authority
- FI
- Finland
- Prior art keywords
- signal
- tuning
- frequency
- generating
- devices
- Prior art date
Links
Landscapes
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention concerns a tuning system for a receiver for the selection of a radio frequency (RF) signal from several receivable RF signals, comprising: RF devices TC-1, TC-2, LV-DTF, HV-DTF, UHF-DTF which have an adjustable frequency selective characteristic for reception of RF signals; an oscillator device L/-1 for generating an oscillator signal, the frequency of which is controlled by a first control signal for the selection of the abovementioned individual RF signal; a mixer device MX for superposing the RF-devices' RF signals and the abovementioned oscillator signal for generating an intermediate frequency IF signal with a predetermined frequency; a first control device for generating a first control signal for the selection of the abovementioned individual RF signal in such a way that the frequency of the abovementioned individual RF signal is changed to the abovementioned predetermined IF frequency by the action of the mixer device; a tuneable circuit device which is included in the RF devices for adjustment of their frequency-selective characteristics dependent upon the tuning signal and for generating the adjustment signal of the device. In order to minimize the mechanical tuning, the tuning system is characterized by devices NVM, PROM for generating a first component in the tuning signal, which first component has several values corresponding to adjacent corresponding groups of RF signals; device TC for generating a second component in the tuning signal dependent upon the selection of the abovementioned individual RF signal; devices NVM, PROM for storing the first component and excluding the second component; devices 51, 52, 53, R7, R8 for combining the first and the second components for generating a tuning signal and supplying the tuning signal to the circuit device which is to be tuned in order to achieve tuning of the frequency selective characteristic. <IMAGE>
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US30285381 | 1981-09-16 | ||
US06/302,853 US4402089A (en) | 1981-09-16 | 1981-09-16 | Television tuning system with electronic frequency adjustment apparatus |
FI823127 | 1982-09-09 | ||
FI823127A FI76468C (en) | 1981-09-16 | 1982-09-09 | AVSTAEMNINGSSYSTEM FOER TELEVISION MED ELEKTRONISK FREKVENSREGLERING. |
Publications (4)
Publication Number | Publication Date |
---|---|
FI873138A true FI873138A (en) | 1987-07-15 |
FI873138A0 FI873138A0 (en) | 1987-07-15 |
FI80547B FI80547B (en) | 1990-02-28 |
FI80547C FI80547C (en) | 1990-06-11 |
Family
ID=26157375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI873138A FI80547C (en) | 1981-09-16 | 1987-07-15 | AVSTAEMNINGSSYSTEM FOER EN MOTTAGARE. |
Country Status (1)
Country | Link |
---|---|
FI (1) | FI80547C (en) |
-
1987
- 1987-07-15 FI FI873138A patent/FI80547C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI80547C (en) | 1990-06-11 |
FI80547B (en) | 1990-02-28 |
FI873138A0 (en) | 1987-07-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM | Patent lapsed | ||
MM | Patent lapsed |
Owner name: RCA LICENSING CORPORATION |