KR950002040B1 - Auto-frequency tuning device - Google Patents

Auto-frequency tuning device Download PDF

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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
Application number
KR89018716A
Other languages
Korean (ko)
Other versions
KR910013701A (en
Inventor
Song-Kyu Choe
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to KR89018716A priority Critical patent/KR950002040B1/en
Publication of KR910013701A publication Critical patent/KR910013701A/en
Application granted granted Critical
Publication of KR950002040B1 publication Critical patent/KR950002040B1/en

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  • 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.
KR89018716A 1989-12-16 1989-12-16 Auto-frequency tuning device KR950002040B1 (en)

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)

Also Published As

Publication number Publication date
KR910013701A (en) 1991-08-08

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