JPS5739685A - Automatic switching circuit - Google Patents

Automatic switching circuit

Info

Publication number
JPS5739685A
JPS5739685A JP55115066A JP11506680A JPS5739685A JP S5739685 A JPS5739685 A JP S5739685A JP 55115066 A JP55115066 A JP 55115066A JP 11506680 A JP11506680 A JP 11506680A JP S5739685 A JPS5739685 A JP S5739685A
Authority
JP
Japan
Prior art keywords
signal
circuit
burst
quartz
automatic switching
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
JP55115066A
Other languages
Japanese (ja)
Inventor
Shigeo Abe
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55115066A priority Critical patent/JPS5739685A/en
Publication of JPS5739685A publication Critical patent/JPS5739685A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To prevent malfunction due to noise, by providing a quartz injection lock circuit and detecting an input signal every 1Hz through the use of sharp filter characteristics of quartz. CONSTITUTION:A burst signal is fetched to a quartz injection lock circuit 21 at the section with the burst gate pulse at a terminal 23, to obtain a given continuous frequency signal (4.25MHz) from the circuit 21. In this case, since a limit is given to an output signal of the circuit 21, the variance of the output level is avoided with the variance in the input level. Next, this signal is inputted to a muting circuit 22, the spurious component in the burst section is eliminated from this signal and the result is inputted to an amplifier 24 and a rectifying circuit 25. Then, since the burst signal frequency in a PAL and a SECAM signal is different from the circuit 25, different signals are transmitted for the ocassion and this signal is used as an automatic switching signal.
JP55115066A 1980-08-21 1980-08-21 Automatic switching circuit Pending JPS5739685A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55115066A JPS5739685A (en) 1980-08-21 1980-08-21 Automatic switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55115066A JPS5739685A (en) 1980-08-21 1980-08-21 Automatic switching circuit

Publications (1)

Publication Number Publication Date
JPS5739685A true JPS5739685A (en) 1982-03-04

Family

ID=14653324

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55115066A Pending JPS5739685A (en) 1980-08-21 1980-08-21 Automatic switching circuit

Country Status (1)

Country Link
JP (1) JPS5739685A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207494A (en) * 1981-06-16 1982-12-20 Rohm Co Ltd Signal detector
JPS58225790A (en) * 1982-06-24 1983-12-27 Matsushita Electric Ind Co Ltd Television signal recording and reproducing device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57207494A (en) * 1981-06-16 1982-12-20 Rohm Co Ltd Signal detector
JPS637712B2 (en) * 1981-06-16 1988-02-18 Rohm Kk
JPS58225790A (en) * 1982-06-24 1983-12-27 Matsushita Electric Ind Co Ltd Television signal recording and reproducing device
JPH0452672B2 (en) * 1982-06-24 1992-08-24 Matsushita Electric Ind Co Ltd

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