JPS55104138A - Amplitude modulation circuit - Google Patents

Amplitude modulation circuit

Info

Publication number
JPS55104138A
JPS55104138A JP1242579A JP1242579A JPS55104138A JP S55104138 A JPS55104138 A JP S55104138A JP 1242579 A JP1242579 A JP 1242579A JP 1242579 A JP1242579 A JP 1242579A JP S55104138 A JPS55104138 A JP S55104138A
Authority
JP
Japan
Prior art keywords
amplitude modulation
delay circuit
carrier
transistor
leading
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
JP1242579A
Other languages
Japanese (ja)
Other versions
JPS6243373B2 (en
Inventor
Yoshikazu Yoshikawa
Toshiyuki Nishimura
Yuji Tsuda
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1242579A priority Critical patent/JPS55104138A/en
Publication of JPS55104138A publication Critical patent/JPS55104138A/en
Publication of JPS6243373B2 publication Critical patent/JPS6243373B2/ja
Granted legal-status Critical Current

Links

Classifications

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

Landscapes

  • Transmitters (AREA)

Abstract

PURPOSE:To prevent the interference to the radio unit in the vicinity, by preventing the spread of the carrier frequency spectrum with amplitude modulation, through the provision of the delay circuit taking longer the leading and trailing time of rectangular waves and through the intermission of carrier with the output of delay circuit. CONSTITUTION:When the transistor 21 of the delay circuit IV taking longer the leading and trailing of the rectangular waves of the rectangular wave osicllation circuit V is ON, electromagnetic waves are radiated since miximum carrier current flows to the bar antenna coil 6 of the carrier power amplifying circuit II. When the transistor 21 is OFF, the transistor 9 is OFF, no current flows to the bar antenna coil 6 and no electromagnetic waves are radiated. Since the leading and trailing of the amplitude modulation signal constitute exponential curve having the time constant of the (resistor 23)X(capacitor) 22 of the delay circuit IV, the harmonics included in the amplitude modulation signal is less and the giving of electromagnetic wave interference is less.
JP1242579A 1979-02-06 1979-02-06 Amplitude modulation circuit Granted JPS55104138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1242579A JPS55104138A (en) 1979-02-06 1979-02-06 Amplitude modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1242579A JPS55104138A (en) 1979-02-06 1979-02-06 Amplitude modulation circuit

Publications (2)

Publication Number Publication Date
JPS55104138A true JPS55104138A (en) 1980-08-09
JPS6243373B2 JPS6243373B2 (en) 1987-09-14

Family

ID=11804916

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1242579A Granted JPS55104138A (en) 1979-02-06 1979-02-06 Amplitude modulation circuit

Country Status (1)

Country Link
JP (1) JPS55104138A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49107217U (en) * 1972-12-28 1974-09-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49107217U (en) * 1972-12-28 1974-09-13

Also Published As

Publication number Publication date
JPS6243373B2 (en) 1987-09-14

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