JPS54162526A - Vertical synchronizing detection system in pcm system recorder-reproducer - Google Patents

Vertical synchronizing detection system in pcm system recorder-reproducer

Info

Publication number
JPS54162526A
JPS54162526A JP7108178A JP7108178A JPS54162526A JP S54162526 A JPS54162526 A JP S54162526A JP 7108178 A JP7108178 A JP 7108178A JP 7108178 A JP7108178 A JP 7108178A JP S54162526 A JPS54162526 A JP S54162526A
Authority
JP
Japan
Prior art keywords
vertical synchronizing
signal
period
time
counter
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
JP7108178A
Other languages
Japanese (ja)
Other versions
JPS6243266B2 (en
Inventor
Shinji Aoshima
Michiaki Kumaoka
Nobuo Fukumoto
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.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki 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 Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Priority to JP7108178A priority Critical patent/JPS54162526A/en
Publication of JPS54162526A publication Critical patent/JPS54162526A/en
Publication of JPS6243266B2 publication Critical patent/JPS6243266B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To readily and rately detect vertical synchronizing by detecting the portion where the rise interval at the last period of the vertical synchronizing pulse period of the composite period signal is extremely narrow.
CONSTITUTION: The composite synchronizing signal Sc being applied to input terminal 30 is applied to the clear terminal 37a of a counter 37 through a differentiating circuit 31. A counter 37 maintains the level "H" during the time since the signal Sc rose until the counter counts 16 pulses of 2.0475M Hz, i.e., for a period of 8μ sec. Beyond this the level goes to "L" and the above is repeated. Here, the clear of an FF 38 is released at the rise (time t1) of the final unit pulse PA of the vertical synchronizing pulse period and the inversion output thereofis made "L" so that the data input of an FF 39 is forcefully made "H". When the data are read in at the next rise (time t2) of the signal Sc, the non-inversion output of the FF 39 becomes "H" and the inversion output "L". Such "L" output becomes the vertical synchronizing detection signal.
COPYRIGHT: (C)1979,JPO&Japio
JP7108178A 1978-06-13 1978-06-13 Vertical synchronizing detection system in pcm system recorder-reproducer Granted JPS54162526A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7108178A JPS54162526A (en) 1978-06-13 1978-06-13 Vertical synchronizing detection system in pcm system recorder-reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7108178A JPS54162526A (en) 1978-06-13 1978-06-13 Vertical synchronizing detection system in pcm system recorder-reproducer

Publications (2)

Publication Number Publication Date
JPS54162526A true JPS54162526A (en) 1979-12-24
JPS6243266B2 JPS6243266B2 (en) 1987-09-12

Family

ID=13450211

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7108178A Granted JPS54162526A (en) 1978-06-13 1978-06-13 Vertical synchronizing detection system in pcm system recorder-reproducer

Country Status (1)

Country Link
JP (1) JPS54162526A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61191169A (en) * 1985-02-14 1986-08-25 Sony Tektronix Corp Separating circuit for vertical synchronizing signal
JPS6481576A (en) * 1987-09-24 1989-03-27 Toshiba Corp Frame detection circuit for television signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61191169A (en) * 1985-02-14 1986-08-25 Sony Tektronix Corp Separating circuit for vertical synchronizing signal
JPS6481576A (en) * 1987-09-24 1989-03-27 Toshiba Corp Frame detection circuit for television signal

Also Published As

Publication number Publication date
JPS6243266B2 (en) 1987-09-12

Similar Documents

Publication Publication Date Title
JPS5340211A (en) Video signal processing circuit
JPS53144621A (en) Video signal processing system
JPS54162526A (en) Vertical synchronizing detection system in pcm system recorder-reproducer
JPS524143A (en) Digital filter
JPS51123118A (en) Method of playback of field signal
JPS5336A (en) Data input unit
JPS5335448A (en) Data processing system having building block construction
JPS5665316A (en) Processor for digital signal
JPS5433060A (en) Printing recorder
JPS5234623A (en) Ghost elimination equipment
JPS53118948A (en) Synchronizing unit
JPS57150113A (en) Muting device
JPS51123185A (en) Parent-child clock
JPS5377412A (en) Noise eliminating circuit
JPS5541090A (en) Density judgment system for video information
JPS53142210A (en) Pcm recorder/reproducer
JPS547846A (en) Discrimination system for digital amplitude, polarity and code
JPS52129271A (en) Signal detection unit
JPS5421120A (en) Coordinate input unit
JPS5222678A (en) Method to obtaining position control signal
JPS53117925A (en) Frequency control circuit
JPS5387714A (en) Trouble detecting system
JPS53120329A (en) Signal detection circuit
JPS52123275A (en) Digital apparatus
JPS5399715A (en) Video signal processing circuit