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JPS54102918A - Carrier frequency detecting device - Google Patents

Carrier frequency detecting device

Info

Publication number
JPS54102918A
JPS54102918A JP1021978A JP1021978A JPS54102918A JP S54102918 A JPS54102918 A JP S54102918A JP 1021978 A JP1021978 A JP 1021978A JP 1021978 A JP1021978 A JP 1021978A JP S54102918 A JPS54102918 A JP S54102918A
Authority
JP
Japan
Prior art keywords
circuit
signal
frequency
white peak
synchronous
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
JP1021978A
Other languages
Japanese (ja)
Inventor
Satoru Komurasaki
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 JP1021978A priority Critical patent/JPS54102918A/en
Publication of JPS54102918A publication Critical patent/JPS54102918A/en
Pending legal-status Critical Current

Links

Landscapes

  • Television Signal Processing For Recording (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE: To ensure the high-accuracy reading of the carrier frequency by using the TV signal as the input and with installation of the FM modulation circuit, pulse generator circuit, gate circuit, frequency detector and display circuit respectively.
CONSTITUTION: When TV signal A featuring the synchronous tip and the white peak is applied to terminal 21, the FM modulation is given through FM modulator circuit 1 to deliver the frequency of fLHz according to the synchronous part of the TV signal as well as signal B of frequency of fHHz according to the white peak part. Digital signal C of H-level is generated only at the synchronous part and the white peak part at pulse generator circuit 4 to be applied to gate 2 as well as to frequency detector circuit 3. The output of circuit 1 is applied to circuit 2, and signal D corresponding to the output of circuit 4 is supplied to circuit 3. The pulse number is counted at circuit 3 for the reference input signal of a fixed frequency and then displayed at display circuit 5 in the form of the digital signal. Thus, the quick and accurate measurement is possible for the frequency at the areas of the synchronous tip and the white peak.
COPYRIGHT: (C)1979,JPO&Japio
JP1021978A 1978-01-31 1978-01-31 Carrier frequency detecting device Pending JPS54102918A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1021978A JPS54102918A (en) 1978-01-31 1978-01-31 Carrier frequency detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1021978A JPS54102918A (en) 1978-01-31 1978-01-31 Carrier frequency detecting device

Publications (1)

Publication Number Publication Date
JPS54102918A true JPS54102918A (en) 1979-08-13

Family

ID=11744153

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1021978A Pending JPS54102918A (en) 1978-01-31 1978-01-31 Carrier frequency detecting device

Country Status (1)

Country Link
JP (1) JPS54102918A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57135581A (en) * 1981-02-16 1982-08-21 Hitachi Ltd Reception circuit for fm television signal
JPS5981989A (en) * 1982-11-01 1984-05-11 Matsushita Electric Ind Co Ltd Video signal regenerating device
WO1988003348A1 (en) * 1986-10-28 1988-05-05 Mitsubishi Denki Kabushiki Kaisha Apparatus for magnetically recording and reproducing video signals

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57135581A (en) * 1981-02-16 1982-08-21 Hitachi Ltd Reception circuit for fm television signal
JPS5981989A (en) * 1982-11-01 1984-05-11 Matsushita Electric Ind Co Ltd Video signal regenerating device
WO1988003348A1 (en) * 1986-10-28 1988-05-05 Mitsubishi Denki Kabushiki Kaisha Apparatus for magnetically recording and reproducing video signals

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