JPS55112027A - Automatic sweep channel selection device - Google Patents

Automatic sweep channel selection device

Info

Publication number
JPS55112027A
JPS55112027A JP1919079A JP1919079A JPS55112027A JP S55112027 A JPS55112027 A JP S55112027A JP 1919079 A JP1919079 A JP 1919079A JP 1919079 A JP1919079 A JP 1919079A JP S55112027 A JPS55112027 A JP S55112027A
Authority
JP
Japan
Prior art keywords
voltage
frequency
output
central
discrimination
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP1919079A
Other languages
Japanese (ja)
Inventor
Kazumi Kawashima
Sadahiro Takuhara
Minoru Ueda
Hirosuke Yamamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1919079A priority Critical patent/JPS55112027A/en
Publication of JPS55112027A publication Critical patent/JPS55112027A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element

Abstract

PURPOSE:To secure the accurate automatic tuning based on the frequency discrimination voltage. CONSTITUTION:When the automatic sweep is given to the frequency, the S-curve discrimination output of the AFC circuit is compared with reference voltage x and y at comparators 29 and 30 to generate comparison output X and Y. Voltage x is equal to the central voltage of the AFC discrimination output; while voltage y is slightly lower than the central voltage. Thus up-count CU of the tuner is stopped when signal TVXY based on comparison output Y has the rise, and down-count CD is generated. And counter 6 has the slow counting toward the central frequency after passing through the tuning frequency once. With generation of signal TVX based on comparison output X, the counting is stopped. And the value of counter 6 is written into the memory part.
JP1919079A 1979-02-20 1979-02-20 Automatic sweep channel selection device Pending JPS55112027A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1919079A JPS55112027A (en) 1979-02-20 1979-02-20 Automatic sweep channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1919079A JPS55112027A (en) 1979-02-20 1979-02-20 Automatic sweep channel selection device

Publications (1)

Publication Number Publication Date
JPS55112027A true JPS55112027A (en) 1980-08-29

Family

ID=11992412

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1919079A Pending JPS55112027A (en) 1979-02-20 1979-02-20 Automatic sweep channel selection device

Country Status (1)

Country Link
JP (1) JPS55112027A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178013A (en) * 1983-03-29 1984-10-09 Pioneer Electronic Corp Method for selecting channel of receiver
JPS62271515A (en) * 1986-05-20 1987-11-25 Sanyo Electric Co Ltd Channel selection data preset device for voltage synthesizer tuner
JPS62284516A (en) * 1986-06-03 1987-12-10 Sanyo Electric Co Ltd Channel selection data presetting device for voltage synthesizer tuner
JPS6477325A (en) * 1987-09-18 1989-03-23 Nec Corp Intermediate frequency pulling-in device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178013A (en) * 1983-03-29 1984-10-09 Pioneer Electronic Corp Method for selecting channel of receiver
JPH0245849B2 (en) * 1983-03-29 1990-10-12 Pioneer Electronic Corp
JPS62271515A (en) * 1986-05-20 1987-11-25 Sanyo Electric Co Ltd Channel selection data preset device for voltage synthesizer tuner
JPS62284516A (en) * 1986-06-03 1987-12-10 Sanyo Electric Co Ltd Channel selection data presetting device for voltage synthesizer tuner
JPS6477325A (en) * 1987-09-18 1989-03-23 Nec Corp Intermediate frequency pulling-in device

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