JPS5731274A - Detecting circuit of noise band phase - Google Patents

Detecting circuit of noise band phase

Info

Publication number
JPS5731274A
JPS5731274A JP10692280A JP10692280A JPS5731274A JP S5731274 A JPS5731274 A JP S5731274A JP 10692280 A JP10692280 A JP 10692280A JP 10692280 A JP10692280 A JP 10692280A JP S5731274 A JPS5731274 A JP S5731274A
Authority
JP
Japan
Prior art keywords
signal
zero cross
noise band
reproduced
carrier
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
JP10692280A
Other languages
Japanese (ja)
Inventor
Shigekazu Togashi
Hiroshi Kitaura
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 JP10692280A priority Critical patent/JPS5731274A/en
Publication of JPS5731274A publication Critical patent/JPS5731274A/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
    • H04N5/76—Television signal recording
    • H04N5/78—Television signal recording using magnetic recording
    • H04N5/782—Television signal recording using magnetic recording on tape
    • H04N5/783—Adaptations for reproducing at a rate different from the recording rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To assuredly detect the position of the noise band, by providing a means to give an envelope curve wave detection to the FM carrier reproduced by a tape, a high band pass filter means and the 1st and 2nd zero cross detecting means and then comparing the output signal of the 2nd zero cross detecting means with the vertical synchronous signal or the signal synchronous with the vertical synchronous signal. CONSTITUTION:An envelope curve wave detection is given to the reproduced FM carrier through an envelope curve wave detecting circuit 4, and the DC component is eliminated by a high pass filter 5. Then the zero cross position is detected to obtain a pulse signal, and this signal is integrated by an integral network 7. A zero cross detection is carried out again through a zero cross detecting circuit 8. Thus a signal whose rise substantially coincident with the minimum point of the reproduced FM carrier is obtained. This signal is converted through a waveform shaping circuit 9 to obtain a pulse signal having a certain width. When a coincidence is obtained between a high level output of the above-mentioned pulse signal and the vertical synchronous signal, the noise band phase is detected. As a result, an accurate coincidence of the noise band caused during the steal reproduction with the vertical blanking period is obtained.
JP10692280A 1980-07-31 1980-07-31 Detecting circuit of noise band phase Pending JPS5731274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10692280A JPS5731274A (en) 1980-07-31 1980-07-31 Detecting circuit of noise band phase

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10692280A JPS5731274A (en) 1980-07-31 1980-07-31 Detecting circuit of noise band phase

Publications (1)

Publication Number Publication Date
JPS5731274A true JPS5731274A (en) 1982-02-19

Family

ID=14445902

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10692280A Pending JPS5731274A (en) 1980-07-31 1980-07-31 Detecting circuit of noise band phase

Country Status (1)

Country Link
JP (1) JPS5731274A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60123181A (en) * 1983-12-07 1985-07-01 Sony Corp Track jump detector for video tape recorder
JPS61191678U (en) * 1985-05-22 1986-11-28
JPH01292873A (en) * 1988-05-20 1989-11-27 Nec Corp Laser device oscillation frequency stabilization

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60123181A (en) * 1983-12-07 1985-07-01 Sony Corp Track jump detector for video tape recorder
JPS61191678U (en) * 1985-05-22 1986-11-28
JPH01292873A (en) * 1988-05-20 1989-11-27 Nec Corp Laser device oscillation frequency stabilization

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