JPS55161475A - Squelch circuit of television receiver - Google Patents

Squelch circuit of television receiver

Info

Publication number
JPS55161475A
JPS55161475A JP6961479A JP6961479A JPS55161475A JP S55161475 A JPS55161475 A JP S55161475A JP 6961479 A JP6961479 A JP 6961479A JP 6961479 A JP6961479 A JP 6961479A JP S55161475 A JPS55161475 A JP S55161475A
Authority
JP
Japan
Prior art keywords
circuit
signal
switching
synchronizing
converted
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
JP6961479A
Other languages
Japanese (ja)
Inventor
Kazuaki Sakamoto
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.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen 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 Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP6961479A priority Critical patent/JPS55161475A/en
Publication of JPS55161475A publication Critical patent/JPS55161475A/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H04N5/505—Invisible or silent tuning

Abstract

PURPOSE:To erase noise generated for idle channel passage, by detecting the synchronizing signal and by switching a sound circuit on a basis of the detection result. CONSTITUTION:The synchronizing signal separated from the video carrier wave signal by synchronizing separating circuit 10 is converted to a pulse signal by waveform shaping circuit 20 and is converted to a DC voltage by integrating circuit 21 and is sent to switching circuit 22. Then, the squelch signal from switching circuit 22 is cut off, and sound amplifying circuit 15 operates normally. When tuner circuit 2 selects an idle channel, the synchronizing signal is not included, and therefore, the squelch signal is transmitted from switching circuit 22 to turn off sound amplifying circuit 15.
JP6961479A 1979-06-04 1979-06-04 Squelch circuit of television receiver Pending JPS55161475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6961479A JPS55161475A (en) 1979-06-04 1979-06-04 Squelch circuit of television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6961479A JPS55161475A (en) 1979-06-04 1979-06-04 Squelch circuit of television receiver

Publications (1)

Publication Number Publication Date
JPS55161475A true JPS55161475A (en) 1980-12-16

Family

ID=13407905

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6961479A Pending JPS55161475A (en) 1979-06-04 1979-06-04 Squelch circuit of television receiver

Country Status (1)

Country Link
JP (1) JPS55161475A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61176878U (en) * 1985-04-20 1986-11-05
JPS6482864A (en) * 1987-09-25 1989-03-28 Sanyo Electric Co Control circuit for video memory
EP0661873A1 (en) * 1993-12-28 1995-07-05 Matsushita Electric Industrial Co., Ltd. A video-signal transmitter-receiver and a signal transmission apparatus utilizing the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61176878U (en) * 1985-04-20 1986-11-05
JPS6482864A (en) * 1987-09-25 1989-03-28 Sanyo Electric Co Control circuit for video memory
JP2834732B2 (en) * 1987-09-25 1998-12-14 三洋電機株式会社 Video memory control circuit
EP0661873A1 (en) * 1993-12-28 1995-07-05 Matsushita Electric Industrial Co., Ltd. A video-signal transmitter-receiver and a signal transmission apparatus utilizing the same
US5539477A (en) * 1993-12-28 1996-07-23 Matsushita Electric Industrial Co., Ltd. Video-signal transmitter-receiver and a signal transmission apparatus utilizing the same

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