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JPS56104577A - Field distinction circuit - Google Patents

Field distinction circuit

Info

Publication number
JPS56104577A
JPS56104577A JP720180A JP720180A JPS56104577A JP S56104577 A JPS56104577 A JP S56104577A JP 720180 A JP720180 A JP 720180A JP 720180 A JP720180 A JP 720180A JP S56104577 A JPS56104577 A JP S56104577A
Authority
JP
Japan
Prior art keywords
pulse
circuit
signal
output
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
JP720180A
Other languages
Japanese (ja)
Other versions
JPH025073B2 (en
Inventor
Hideki Miura
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP720180A priority Critical patent/JPS56104577A/en
Publication of JPS56104577A publication Critical patent/JPS56104577A/en
Publication of JPH025073B2 publication Critical patent/JPH025073B2/ja
Granted 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 obtain a field distinction circuit which is suitable for IC and is immune from noise and has no malfunctions, by counting the number of horizontal synchronizing signals in one vertical period and by comparing this number with the reference value for distinction. CONSTITUTION:64-Notation counter 14 is cleared by vertical synchronizing signal VD, and outputs pulse A when 32 horizontal synchronizing signals HD are counted. Octal counter 15 outputs pulse B when 4 pulses A are counted. These pulses A and B are input to AND circuit 16 to output pulse C. Gate signal generating circuit 18 supplies pulse -C obtained by reversing the pulse C, and pulse B to AND circuit 21 and supplies output clear pulse D to 32-notation counter 22. Counting 16 signals of HD, counter 22 outputs a pulse and reverses it by reversing circuit 23 and supplies pulse E to AND circuit 19 as the gate signal. Since output F of circuit 19 becomes the vertical synchronizing signal only when input signal VD of terminal 12 is the signal of the 60/525 system, the system to which the receiving TV signal belongs is distinguished. Now malfunctions are excluded by the output of FF28 of terminals 29 and 30.
JP720180A 1980-01-24 1980-01-24 Field distinction circuit Granted JPS56104577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP720180A JPS56104577A (en) 1980-01-24 1980-01-24 Field distinction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP720180A JPS56104577A (en) 1980-01-24 1980-01-24 Field distinction circuit

Publications (2)

Publication Number Publication Date
JPS56104577A true JPS56104577A (en) 1981-08-20
JPH025073B2 JPH025073B2 (en) 1990-01-31

Family

ID=11659407

Family Applications (1)

Application Number Title Priority Date Filing Date
JP720180A Granted JPS56104577A (en) 1980-01-24 1980-01-24 Field distinction circuit

Country Status (1)

Country Link
JP (1) JPS56104577A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59180567U (en) * 1983-05-18 1984-12-03 三洋電機株式会社 detection circuit
JPS6035888A (en) * 1984-06-13 1985-02-23 Matsushita Electric Ind Co Ltd Rotary head type magnetic picture recording and reproducing device
JPS6314580A (en) * 1986-07-07 1988-01-21 Pioneer Electronic Corp Identification device for sound multiplex broadcasting pilot signal
JPH0576226B2 (en) * 1981-10-19 1993-10-22 Motorola Inc

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6422020B2 (en) * 2014-11-18 2018-11-14 三菱重工業株式会社 Twin skeg ship

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0576226B2 (en) * 1981-10-19 1993-10-22 Motorola Inc
JPS59180567U (en) * 1983-05-18 1984-12-03 三洋電機株式会社 detection circuit
JPH0441662Y2 (en) * 1983-05-18 1992-09-30
JPS6035888A (en) * 1984-06-13 1985-02-23 Matsushita Electric Ind Co Ltd Rotary head type magnetic picture recording and reproducing device
JPS6314580A (en) * 1986-07-07 1988-01-21 Pioneer Electronic Corp Identification device for sound multiplex broadcasting pilot signal

Also Published As

Publication number Publication date
JPH025073B2 (en) 1990-01-31

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