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JPS6449478A - Synchronizing signal processing circuit - Google Patents

Synchronizing signal processing circuit

Info

Publication number
JPS6449478A
JPS6449478A JP20700687A JP20700687A JPS6449478A JP S6449478 A JPS6449478 A JP S6449478A JP 20700687 A JP20700687 A JP 20700687A JP 20700687 A JP20700687 A JP 20700687A JP S6449478 A JPS6449478 A JP S6449478A
Authority
JP
Japan
Prior art keywords
voltage
input
synchronizing signal
voltages
comparators
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
JP20700687A
Other languages
Japanese (ja)
Inventor
Junichi Momotake
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 JP20700687A priority Critical patent/JPS6449478A/en
Publication of JPS6449478A publication Critical patent/JPS6449478A/en
Pending legal-status Critical Current

Links

Landscapes

  • Synchronizing For Television (AREA)

Abstract

PURPOSE:To execute a stable waveform shaping output and the output of the information of a non-input by using two comparators having comparing voltages different from each other and properly setting the relation of the comparing reference voltages and the mean DC voltage of an input synchronizing signal. CONSTITUTION:To the inversion input of a comparator 1 and the non-inversion input of a comparator 2, a synchronizing signal in which the mean DC voltage is made into a reference voltage V3 is inputted. The comparators 1 and 2 are the comparators whose comparing voltages are V4 and V5 respectively, and a window comparator is composed of the comparators along with an OR circuit. A voltage holding circuit is composed of a diode D1 connected to the output of the window comparator, a resistance R4 and a capacity C4. The relation of the voltages V2-V4 is V2>V3>V4 and, simultaneously, V2-V3=V3-V4. The setting of the voltages V2-V4 is executed, when the input synchronizing signal has a straight polarity, so as to cross the voltage V2 and not to cross the voltage V4, and when the input synchronizing signal has a negative polarity, so as to cross the voltage V4 and not to cross the voltage V2. Thus, the waveform shaping output having the constant polarity and amplitude and the information of the non-input can be stably outputted.
JP20700687A 1987-08-20 1987-08-20 Synchronizing signal processing circuit Pending JPS6449478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20700687A JPS6449478A (en) 1987-08-20 1987-08-20 Synchronizing signal processing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20700687A JPS6449478A (en) 1987-08-20 1987-08-20 Synchronizing signal processing circuit

Publications (1)

Publication Number Publication Date
JPS6449478A true JPS6449478A (en) 1989-02-23

Family

ID=16532635

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20700687A Pending JPS6449478A (en) 1987-08-20 1987-08-20 Synchronizing signal processing circuit

Country Status (1)

Country Link
JP (1) JPS6449478A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5061648A (en) * 1985-10-04 1991-10-29 Hosiden Electronics Co., Ltd. Method of fabricating a thin-film transistor
JPH0823458A (en) * 1994-07-05 1996-01-23 Nec Corp Synchronization detection circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49119521A (en) * 1973-03-15 1974-11-15

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49119521A (en) * 1973-03-15 1974-11-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5061648A (en) * 1985-10-04 1991-10-29 Hosiden Electronics Co., Ltd. Method of fabricating a thin-film transistor
JPH0823458A (en) * 1994-07-05 1996-01-23 Nec Corp Synchronization detection circuit

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