JPS54129813A - Composite modulation system - Google Patents

Composite modulation system

Info

Publication number
JPS54129813A
JPS54129813A JP3751678A JP3751678A JPS54129813A JP S54129813 A JPS54129813 A JP S54129813A JP 3751678 A JP3751678 A JP 3751678A JP 3751678 A JP3751678 A JP 3751678A JP S54129813 A JPS54129813 A JP S54129813A
Authority
JP
Japan
Prior art keywords
signal
modulator
modulation
sub
output
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
JP3751678A
Other languages
Japanese (ja)
Inventor
Hachihei Kurematsu
Kazuo Ogawa
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 JP3751678A priority Critical patent/JPS54129813A/en
Publication of JPS54129813A publication Critical patent/JPS54129813A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J9/00—Multiplex systems in which each channel is represented by a different type of modulation of the carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To perform composite modulation for the sub-signal with excellent performance without extending especially for the frequency band, by performing ON- OFF amplitude modulation of the digital sub-signal with the main signal after O-pi phase modulation in advance. CONSTITUTION:In the modulation system performing ON-OFF amplitude modulation for the carrier with a digital signal, the O-pi phase modulator 6 is connected between the oscillation source 1 of carrier and the ON-OFF amplitude modulator 3, sub-signal is inputted to the sub-signal input terminal 7 of the modulator 6 to obtain the output modulated into O and pi phase for the carrier at the output terminal 8 of the modulator 6. Further, this modulated signal is made ON-OFF control with the signal fed to the digital input terminal 4 of the modulator 3 to obtain the output in composite modulation at the output terminal 5. Moreover, in other example of execution, the ON-OFF amplitude modulation main signal is differentiated with the differentiating circuit 9, and the digital signal is fed to the modulator 6 with holding to the sample hold circuit 11 with the clock signal of the main signal in advance for the output, to prevent the occurrence of distortion due to main signal.
JP3751678A 1978-03-31 1978-03-31 Composite modulation system Pending JPS54129813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3751678A JPS54129813A (en) 1978-03-31 1978-03-31 Composite modulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3751678A JPS54129813A (en) 1978-03-31 1978-03-31 Composite modulation system

Publications (1)

Publication Number Publication Date
JPS54129813A true JPS54129813A (en) 1979-10-08

Family

ID=12499693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3751678A Pending JPS54129813A (en) 1978-03-31 1978-03-31 Composite modulation system

Country Status (1)

Country Link
JP (1) JPS54129813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62181586A (en) * 1985-10-17 1987-08-08 アムペックス　コーポレーション Formation of digital envelope
JP2009502046A (en) * 2004-12-09 2009-01-22 タング，ボブ Method for increasing channel capacity by three states of +1, -1 and zero without the need to reduce signal-to-noise margin due to intersymbol interference

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62181586A (en) * 1985-10-17 1987-08-08 アムペックス　コーポレーション Formation of digital envelope
JPH0363278B2 (en) * 1985-10-17 1991-09-30 Ampex
JP2009502046A (en) * 2004-12-09 2009-01-22 タング，ボブ Method for increasing channel capacity by three states of +1, -1 and zero without the need to reduce signal-to-noise margin due to intersymbol interference

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