JPS566582A - Secam-system rf modulator - Google Patents

Secam-system rf modulator

Info

Publication number
JPS566582A
JPS566582A JP8135679A JP8135679A JPS566582A JP S566582 A JPS566582 A JP S566582A JP 8135679 A JP8135679 A JP 8135679A JP 8135679 A JP8135679 A JP 8135679A JP S566582 A JPS566582 A JP S566582A
Authority
JP
Japan
Prior art keywords
signal
aural signal
modulated
output
dualgate
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
JP8135679A
Other languages
Japanese (ja)
Other versions
JPS6217916B2 (en
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 JP8135679A priority Critical patent/JPS566582A/en
Publication of JPS566582A publication Critical patent/JPS566582A/en
Publication of JPS6217916B2 publication Critical patent/JPS6217916B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • H04N5/40—Modulation circuits

Abstract

PURPOSE:To avoid the deterioration of the picture quality for the video signal which is caused by mixture of the aural signal, by supplying the modulated aural signal to the 1st gate of dualgate FET and then delivering the output received the frequency conversion via the matching circuit. CONSTITUTION:The modulated aural signal and the video carrier signal are added together and then supplied to the 1st gate G1 of dualgate MOSFETQ2. And the frequency conversion is given to the modulated aural signal. Then source S of FETQ2 is earthed in the AC way by capacitor C7 to obtain the frequency-converted output through drain D of FETQ2. This output is delivered 14 via matching circuit 13. As a result, the deterioration of the pictue quality which is caused by mixture of the aural signal can be prevented for the video signal demodulated by the TV picture reciever.
JP8135679A 1979-06-29 1979-06-29 Secam-system rf modulator Granted JPS566582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8135679A JPS566582A (en) 1979-06-29 1979-06-29 Secam-system rf modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8135679A JPS566582A (en) 1979-06-29 1979-06-29 Secam-system rf modulator

Publications (2)

Publication Number Publication Date
JPS566582A true JPS566582A (en) 1981-01-23
JPS6217916B2 JPS6217916B2 (en) 1987-04-20

Family

ID=13744067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8135679A Granted JPS566582A (en) 1979-06-29 1979-06-29 Secam-system rf modulator

Country Status (1)

Country Link
JP (1) JPS566582A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573600A1 (en) * 1984-11-20 1986-05-23 Radiotechnique Sa TELEVISION SIGNAL MODULATOR CIRCUIT

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573600A1 (en) * 1984-11-20 1986-05-23 Radiotechnique Sa TELEVISION SIGNAL MODULATOR CIRCUIT

Also Published As

Publication number Publication date
JPS6217916B2 (en) 1987-04-20

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