JPS54147725A - Television channel selection unit of synthesizer system - Google Patents

Television channel selection unit of synthesizer system

Info

Publication number
JPS54147725A
JPS54147725A JP5630478A JP5630478A JPS54147725A JP S54147725 A JPS54147725 A JP S54147725A JP 5630478 A JP5630478 A JP 5630478A JP 5630478 A JP5630478 A JP 5630478A JP S54147725 A JPS54147725 A JP S54147725A
Authority
JP
Japan
Prior art keywords
signal
circuit
vertical synchronizing
synchronizing signal
level
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
JP5630478A
Other languages
Japanese (ja)
Other versions
JPS6058632B2 (en
Inventor
Sadahiro Takuhara
Masahiro Takeshita
Minoru Ueda
Hirosuke Yamamoto
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 JP5630478A priority Critical patent/JPS6058632B2/en
Publication of JPS54147725A publication Critical patent/JPS54147725A/en
Publication of JPS6058632B2 publication Critical patent/JPS6058632B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To enable to control accurately at sequential channel selection, by providing the second integration circuit so that the presence of the vertical synchronizing signal in TV signal can correctly be detected.
CONSTITUTION: The synchronizing separation circuit integrates the composite synchronizing signal separated from TV signal with the first integration circuit 24 consisting of the resistor R22 and capacitor 23 to pick up the vertical synchronizing signal A, and it is fed to the first level detection circuit 27 to compare it with the specified level as shown in dotted lines set at R25 and 26, and only the signal more than a given level is picked up as the waveform B. Further, this is integrated at the second integration circuit 30 consisting of R28 and capacitor 29 to remove the high band components into only the signal C having low band components. Further, the signal C is fed to the second level detector 31 to pick up only the part of the vertical synchronizing signal more than a given level as dotted lines, as shown in the waveform D, and the signal D is detected and outputted as the correct vertical synchronizing signal via the gate circuit 32, timer circuit 33 and counter circuit 34.
COPYRIGHT: (C)1979,JPO&Japio
JP5630478A 1978-05-11 1978-05-11 Synthesizer television channel selection device Expired JPS6058632B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5630478A JPS6058632B2 (en) 1978-05-11 1978-05-11 Synthesizer television channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5630478A JPS6058632B2 (en) 1978-05-11 1978-05-11 Synthesizer television channel selection device

Publications (2)

Publication Number Publication Date
JPS54147725A true JPS54147725A (en) 1979-11-19
JPS6058632B2 JPS6058632B2 (en) 1985-12-20

Family

ID=13023382

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5630478A Expired JPS6058632B2 (en) 1978-05-11 1978-05-11 Synthesizer television channel selection device

Country Status (1)

Country Link
JP (1) JPS6058632B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58196780A (en) * 1982-05-12 1983-11-16 Hitachi Ltd Signal detecting circuit
JPS60235593A (en) * 1984-05-08 1985-11-22 Casio Comput Co Ltd Panel mount television receiver
JPS61111075A (en) * 1984-11-05 1986-05-29 Alps Electric Co Ltd Composite video signal deciding and processing means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58196780A (en) * 1982-05-12 1983-11-16 Hitachi Ltd Signal detecting circuit
JPS60235593A (en) * 1984-05-08 1985-11-22 Casio Comput Co Ltd Panel mount television receiver
JPS61111075A (en) * 1984-11-05 1986-05-29 Alps Electric Co Ltd Composite video signal deciding and processing means

Also Published As

Publication number Publication date
JPS6058632B2 (en) 1985-12-20

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