JPS5588475A - Rf modulator - Google Patents

Rf modulator

Info

Publication number
JPS5588475A
JPS5588475A JP16406678A JP16406678A JPS5588475A JP S5588475 A JPS5588475 A JP S5588475A JP 16406678 A JP16406678 A JP 16406678A JP 16406678 A JP16406678 A JP 16406678A JP S5588475 A JPS5588475 A JP S5588475A
Authority
JP
Japan
Prior art keywords
modulation
positive
input terminal
transistor
video signal
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
JP16406678A
Other languages
Japanese (ja)
Inventor
Kotaro Kawamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16406678A priority Critical patent/JPS5588475A/en
Publication of JPS5588475A publication Critical patent/JPS5588475A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To secure the common use by switching for both PAL and SECAM by breaking the balance of the balanced modulator and then obtaining the positive and negative modulation.
CONSTITUTION: The video signal is applied to input terminal 1, and the carrier is applied to input terminal 11. Diodes D2 and D3 are provided for modulation, and the output produced by giving the AM modulation to the carrier via the video signal is obtained at the anodes of D2 and D3 to be delivered to output terminal 13 via matching circuit 12. In this moment, the contact of variable resistance R5 is shifted to transistor Q1 to obtain the positive modulation signal, and then shifted toward transistor Q2 to obtain the negative modulation signal respectively.
COPYRIGHT: (C)1980,JPO&Japio
JP16406678A 1978-12-26 1978-12-26 Rf modulator Pending JPS5588475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16406678A JPS5588475A (en) 1978-12-26 1978-12-26 Rf modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16406678A JPS5588475A (en) 1978-12-26 1978-12-26 Rf modulator

Publications (1)

Publication Number Publication Date
JPS5588475A true JPS5588475A (en) 1980-07-04

Family

ID=15786126

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16406678A Pending JPS5588475A (en) 1978-12-26 1978-12-26 Rf modulator

Country Status (1)

Country Link
JP (1) JPS5588475A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316765U (en) * 1986-07-18 1988-02-03

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50152653A (en) * 1974-05-27 1975-12-08

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50152653A (en) * 1974-05-27 1975-12-08

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6316765U (en) * 1986-07-18 1988-02-03
JPH0514615Y2 (en) * 1986-07-18 1993-04-19

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