JPS5711586A - Automatic switching circuit for magnetic reproducing device - Google Patents

Automatic switching circuit for magnetic reproducing device

Info

Publication number
JPS5711586A
JPS5711586A JP8622480A JP8622480A JPS5711586A JP S5711586 A JPS5711586 A JP S5711586A JP 8622480 A JP8622480 A JP 8622480A JP 8622480 A JP8622480 A JP 8622480A JP S5711586 A JPS5711586 A JP S5711586A
Authority
JP
Japan
Prior art keywords
head
video
revolutions
discriminator
horizontal scanning
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.)
Granted
Application number
JP8622480A
Other languages
Japanese (ja)
Other versions
JPH0157554B2 (en
Inventor
Yutaka Ubusawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP8622480A priority Critical patent/JPS5711586A/en
Publication of JPS5711586A publication Critical patent/JPS5711586A/en
Publication of JPH0157554B2 publication Critical patent/JPH0157554B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/467—Controlling, regulating, or indicating speed in arrangements for recording or reproducing wherein both record carriers and heads are driven

Abstract

PURPOSE:To switch the running speed of magnetic tape and the number of revolutions of video head to a state suitable for the types of video signals, by detecting the horizontal scanning frequency of reproduced video signals. CONSTITUTION:If the number of revolutions of a video head 13 and the types of video signals recorded in a magnetic tape 14 are different, the video signal in FM demodulation 18 is applied to a frequency discriminator 19. Further, the horizontal scanning frequency component passes through a discriminator 19 and is detected 20. This detected output is applied to a bistable multivibrator 21, the output is inverted, the running speed of the magnetic tape 14 and the number of revolutions of the head 13 are made to a state suitable for the reproduction of NTSC signal, PAL or SECAM signal via a cylinder motor control circuit 22 and a capstan motor control circuit 23. On the other hand, if the relation between a recorded signal and the number of revolution of the head 13 is normal, the horizontal scanning frequency does not pass through the discriminator 19 and the running speed of the head 13 and the tape 14 is unchanged.
JP8622480A 1980-06-25 1980-06-25 Automatic switching circuit for magnetic reproducing device Granted JPS5711586A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8622480A JPS5711586A (en) 1980-06-25 1980-06-25 Automatic switching circuit for magnetic reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8622480A JPS5711586A (en) 1980-06-25 1980-06-25 Automatic switching circuit for magnetic reproducing device

Publications (2)

Publication Number Publication Date
JPS5711586A true JPS5711586A (en) 1982-01-21
JPH0157554B2 JPH0157554B2 (en) 1989-12-06

Family

ID=13880811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8622480A Granted JPS5711586A (en) 1980-06-25 1980-06-25 Automatic switching circuit for magnetic reproducing device

Country Status (1)

Country Link
JP (1) JPS5711586A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180174A2 (en) * 1984-10-31 1986-05-07 Hitachi, Ltd. Auto-tracking apparatus of a magnetic recording/reproducing apparatus
EP0647939A1 (en) * 1993-09-07 1995-04-12 Sony Corporation Automatic discrimination of scanning modes by which video signals were recorded

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457827A (en) * 1977-10-17 1979-05-10 Mitsubishi Electric Corp Magnetic recorder for television signal
JPS5582573A (en) * 1978-12-19 1980-06-21 Mitsubishi Electric Corp Tape speed discriminator for magnetic recording and reproducing unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457827A (en) * 1977-10-17 1979-05-10 Mitsubishi Electric Corp Magnetic recorder for television signal
JPS5582573A (en) * 1978-12-19 1980-06-21 Mitsubishi Electric Corp Tape speed discriminator for magnetic recording and reproducing unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180174A2 (en) * 1984-10-31 1986-05-07 Hitachi, Ltd. Auto-tracking apparatus of a magnetic recording/reproducing apparatus
EP0647939A1 (en) * 1993-09-07 1995-04-12 Sony Corporation Automatic discrimination of scanning modes by which video signals were recorded
CN1064475C (en) * 1993-09-07 2001-04-11 索尼公司 Circuit for automatically discriminating scanning modes and a video signal reproducing apparatus having the circuit

Also Published As

Publication number Publication date
JPH0157554B2 (en) 1989-12-06

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