KR950002040B1 - Auto-frequency tuning device - Google Patents
Auto-frequency tuning device Download PDFInfo
- Publication number
- KR950002040B1 KR950002040B1 KR89018716A KR890018716A KR950002040B1 KR 950002040 B1 KR950002040 B1 KR 950002040B1 KR 89018716 A KR89018716 A KR 89018716A KR 890018716 A KR890018716 A KR 890018716A KR 950002040 B1 KR950002040 B1 KR 950002040B1
- Authority
- KR
- South Korea
- Prior art keywords
- freq
- tunning
- signal
- tuner
- aft
- Prior art date
Links
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
The circuit for tunning the selected frequency band precisely includes a frequency synthetic tuner (20) tunning the broadcasting signal; b) intermediate freq. demodulator (30) providing the automatic fine tunning (AFT) signal which voltage gain is varied according the output freq. of the tuner, a differentiator (50) differentiating the AFT signal to detect the rapid variation of the gain level of the AFT signal around the tunning freq., a comparator (40) comparing the differentiated signal to the reference, and a microprocessor (10) controlling the tuner to select the freq. as the channel freq. at which the logic level of the comparator is varied.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR89018716A KR950002040B1 (en) | 1989-12-16 | 1989-12-16 | Auto-frequency tuning device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR89018716A KR950002040B1 (en) | 1989-12-16 | 1989-12-16 | Auto-frequency tuning device |
Publications (2)
Publication Number | Publication Date |
---|---|
KR910013701A KR910013701A (en) | 1991-08-08 |
KR950002040B1 true KR950002040B1 (en) | 1995-03-08 |
Family
ID=19293008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR89018716A KR950002040B1 (en) | 1989-12-16 | 1989-12-16 | Auto-frequency tuning device |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR950002040B1 (en) |
-
1989
- 1989-12-16 KR KR89018716A patent/KR950002040B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR910013701A (en) | 1991-08-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
AMND | Amendment | ||
E601 | Decision to refuse application | ||
G160 | Decision to publish patent application | ||
J2X1 | Appeal (before the patent court) |
Free format text: APPEAL AGAINST DECISION TO DECLINE REFUSAL |
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E902 | Notification of reason for refusal | ||
AMND | Amendment | ||
E601 | Decision to refuse application | ||
J2X1 | Appeal (before the patent court) |
Free format text: APPEAL AGAINST DECISION TO DECLINE REFUSAL |
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G160 | Decision to publish patent application | ||
B701 | Decision to grant | ||
GRNT | Written decision to grant | ||
LAPS | Lapse due to unpaid annual fee |