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JPS56154807A - Reducing method for hum noise of modulator - Google Patents

Reducing method for hum noise of modulator

Info

Publication number
JPS56154807A
JPS56154807A JP5763180A JP5763180A JPS56154807A JP S56154807 A JPS56154807 A JP S56154807A JP 5763180 A JP5763180 A JP 5763180A JP 5763180 A JP5763180 A JP 5763180A JP S56154807 A JPS56154807 A JP S56154807A
Authority
JP
Japan
Prior art keywords
modulator
hum noise
power source
amplifier
supplied
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
JP5763180A
Other languages
Japanese (ja)
Inventor
Toshinori Yokoe
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5763180A priority Critical patent/JPS56154807A/en
Publication of JPS56154807A publication Critical patent/JPS56154807A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details

Landscapes

  • Amplitude Modulation (AREA)

Abstract

PURPOSE:To eliminate hum noise included in a DC power source by a simple circuit by canceling the hum noise by using a phase inverting amplifier. CONSTITUTION:Direct-current DC power source 1 including hum noise is supplied to modulator 6 and base band amplifier 7 and a base band signal from terminal 8 is supplied to modulator 6 via amplifier 7. The hum noise included in power source 1, on the other hand, is extracted through LPF10 and then inverted in phase by phase inverting amplifier 11. This output and the output of amplifier 7 are then supplied to modulator 6 via mixing circuit 12. Therefore, the hum noise is canceled and removed and only the signal having no noise is outputted from modulator 6. Thus, even the simple circuit is capable of eliminating the hum noise included in the DC power source.
JP5763180A 1980-04-30 1980-04-30 Reducing method for hum noise of modulator Pending JPS56154807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5763180A JPS56154807A (en) 1980-04-30 1980-04-30 Reducing method for hum noise of modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5763180A JPS56154807A (en) 1980-04-30 1980-04-30 Reducing method for hum noise of modulator

Publications (1)

Publication Number Publication Date
JPS56154807A true JPS56154807A (en) 1981-11-30

Family

ID=13061234

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5763180A Pending JPS56154807A (en) 1980-04-30 1980-04-30 Reducing method for hum noise of modulator

Country Status (1)

Country Link
JP (1) JPS56154807A (en)

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