JPS5714258A - Field discrimination circuit for television signal - Google Patents

Field discrimination circuit for television signal

Info

Publication number
JPS5714258A
JPS5714258A JP9011080A JP9011080A JPS5714258A JP S5714258 A JPS5714258 A JP S5714258A JP 9011080 A JP9011080 A JP 9011080A JP 9011080 A JP9011080 A JP 9011080A JP S5714258 A JPS5714258 A JP S5714258A
Authority
JP
Japan
Prior art keywords
synchronizing signal
signal
field
vertical synchronizing
pulse
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
JP9011080A
Other languages
Japanese (ja)
Inventor
Ichiro Iwatsuji
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9011080A priority Critical patent/JPS5714258A/en
Publication of JPS5714258A publication Critical patent/JPS5714258A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)

Abstract

PURPOSE:To enable to discriminate both odd and even number of fields stably with good accuracy, by starting the count from the specified time point of a vertical synchronizing signal, resetting it with a relating horizontal synchronizing signal and transmitting the level from high to low level after it reaches a specified amount. CONSTITUTION:For example, in an odd number of field as shown in Figure, an input CU of a counter 12 supplies the result of logical product between a signal V8 having 1H or more pulse width and the reference signal CP in frequency (1/50H)Hz for count, and on the other hand, the horizontal synchronizing pulse H14 is applied to the R of the counter 12 for periodical reset, and the result is applied to A of a comparator 15. The reference value is applied to another B, and if A>B, AH is at ''1''. Thus, the AH pulse is produced at 5H after the vertical synchronizing signal V starts and it is inputted to D of a latch circuit 20. Further, V19 is applied to the input T and the OF is at high level at an odd number field. On the other hand, at an even field, after the vertical synchronizing signal is started, output is made at 4.5H and the OF is at low level. Thus, the discrimination of both the fields can be made stably, without temperature change and noise.
JP9011080A 1980-06-30 1980-06-30 Field discrimination circuit for television signal Pending JPS5714258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9011080A JPS5714258A (en) 1980-06-30 1980-06-30 Field discrimination circuit for television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9011080A JPS5714258A (en) 1980-06-30 1980-06-30 Field discrimination circuit for television signal

Publications (1)

Publication Number Publication Date
JPS5714258A true JPS5714258A (en) 1982-01-25

Family

ID=13989375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9011080A Pending JPS5714258A (en) 1980-06-30 1980-06-30 Field discrimination circuit for television signal

Country Status (1)

Country Link
JP (1) JPS5714258A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58223965A (en) * 1982-06-21 1983-12-26 Sharp Corp Reset pulse forming circuit
EP0119199A1 (en) * 1982-09-17 1984-09-26 Ampex Method and apparatus for producing an artificial vertical synchronizing signal for video tape recording.
JPS6231286A (en) * 1985-08-02 1987-02-10 Shinko Electric Co Ltd Field discriminating device for interlace video signal
JPS62102681A (en) * 1985-10-29 1987-05-13 Sharp Corp Field discrimination device for composite video signal
US4979033A (en) * 1988-09-27 1990-12-18 Stephens Berton H Stereoscopic video system and method with field synchronization and intensity control
EP0455957A2 (en) * 1990-05-07 1991-11-13 Thomson Consumer Electronics, Inc. Odd/even field detector for video signals
EP0597828A2 (en) * 1987-12-29 1994-05-18 SHARP Corporation Video signal field for discriminating device, e.g. for a liquid crystal display
US5327175A (en) * 1991-12-31 1994-07-05 Samsung Electronics Co., Ltd. Circuit for detecting odd and even fields of a video signal

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58223965A (en) * 1982-06-21 1983-12-26 Sharp Corp Reset pulse forming circuit
EP0119199A1 (en) * 1982-09-17 1984-09-26 Ampex Method and apparatus for producing an artificial vertical synchronizing signal for video tape recording.
EP0311143A2 (en) * 1982-09-17 1989-04-12 Ampex Corporation Method and apparatus for producing an artificial synchronising signal
JPS6231286A (en) * 1985-08-02 1987-02-10 Shinko Electric Co Ltd Field discriminating device for interlace video signal
JPS62102681A (en) * 1985-10-29 1987-05-13 Sharp Corp Field discrimination device for composite video signal
EP0597828A2 (en) * 1987-12-29 1994-05-18 SHARP Corporation Video signal field for discriminating device, e.g. for a liquid crystal display
EP0597828A3 (en) * 1987-12-29 1994-08-24 Sharp Kk Video signal field for discriminating device, e.g. for a liquid crystal display.
US4979033A (en) * 1988-09-27 1990-12-18 Stephens Berton H Stereoscopic video system and method with field synchronization and intensity control
EP0455957A2 (en) * 1990-05-07 1991-11-13 Thomson Consumer Electronics, Inc. Odd/even field detector for video signals
TR26132A (en) * 1990-05-07 1995-02-15 Thomson Consumer Electronics SINGLE / DUAL FIELD DETECTOR FOR VIDEO SIGNALS
US5327175A (en) * 1991-12-31 1994-07-05 Samsung Electronics Co., Ltd. Circuit for detecting odd and even fields of a video signal

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