JPS57178481A - Rf converter - Google Patents

Rf converter

Info

Publication number
JPS57178481A
JPS57178481A JP6301481A JP6301481A JPS57178481A JP S57178481 A JPS57178481 A JP S57178481A JP 6301481 A JP6301481 A JP 6301481A JP 6301481 A JP6301481 A JP 6301481A JP S57178481 A JPS57178481 A JP S57178481A
Authority
JP
Japan
Prior art keywords
oscillator
video
acoustic wave
surface acoustic
audio 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
JP6301481A
Other languages
Japanese (ja)
Inventor
Shigefumi Morishita
Yasuo Ehata
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP6301481A priority Critical patent/JPS57178481A/en
Publication of JPS57178481A publication Critical patent/JPS57178481A/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
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards
    • H04N5/40—Modulation circuits

Abstract

PURPOSE:To make both a video and a voice carrier frequency and their frequency difference extremely stable, by composing a video carrier oscillator and an FM modulator for an audio signal both of surface acoustic wave oscillators made of the same material. CONSTITUTION:A video and an audio signal are inputted to input terminals 11 and 12. Then, the video signal is applied to an AM modulator 15, where AM modulation is imposed upon a video carrier from a video carrier oscillator 13. The oscillator 13 is constituted by a surface acoustic wave oscillator which uses a surface acoustic wave element as a resonator. The audio signal, on the other h and, is applied to an FM modulator 14, which, for example, when a video carrier frequency is fc, converts the audio signal into an FM modulated signal having a carrier frequency fc+4.5MHz. This oscillator 14 is constituted by a surface acoustic wave oscillator which includes a surface acousticwave element using a piezoelectric substrate made of the same material with said surface acoustic wave element constituting the oscillator or 13. Thus, the modulates signal of the video signal and that of the audio signal obtained by the modulator 15 are added linearly by an adder 16, whose output is led to an output terminal 17.
JP6301481A 1981-04-25 1981-04-25 Rf converter Pending JPS57178481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6301481A JPS57178481A (en) 1981-04-25 1981-04-25 Rf converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6301481A JPS57178481A (en) 1981-04-25 1981-04-25 Rf converter

Publications (1)

Publication Number Publication Date
JPS57178481A true JPS57178481A (en) 1982-11-02

Family

ID=13217035

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6301481A Pending JPS57178481A (en) 1981-04-25 1981-04-25 Rf converter

Country Status (1)

Country Link
JP (1) JPS57178481A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321591A1 (en) * 1992-06-29 1994-01-20 Gold Star Co VCR for stereo or multi-language reception - has video signal amplitude modulator, video carrier oscillator and channel selector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321591A1 (en) * 1992-06-29 1994-01-20 Gold Star Co VCR for stereo or multi-language reception - has video signal amplitude modulator, video carrier oscillator and channel selector

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