JPS55147061A - Amplitude-phase modulation system of adaptive type - Google Patents

Amplitude-phase modulation system of adaptive type

Info

Publication number
JPS55147061A
JPS55147061A JP5346379A JP5346379A JPS55147061A JP S55147061 A JPS55147061 A JP S55147061A JP 5346379 A JP5346379 A JP 5346379A JP 5346379 A JP5346379 A JP 5346379A JP S55147061 A JPS55147061 A JP S55147061A
Authority
JP
Japan
Prior art keywords
phase
amplitude
carrier
signal
circuit
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
JP5346379A
Other languages
Japanese (ja)
Inventor
Noboru Sonehara
Yutaka Suzuki
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP5346379A priority Critical patent/JPS55147061A/en
Publication of JPS55147061A publication Critical patent/JPS55147061A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation

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 minimize the transmission distortion, by the amplitude modulation with single polarity signal after selecting the phase of carrier at the noticed section, through the use of time interval for all the signal changing point sections and the phase of carrier other than noticed section. CONSTITUTION:The amplitude level changing point of the singla polarity signal input from the input terminal 11 is detected with the signal changing point detection circuit 12, the duration time Ti of 0 signal is sequentially detected and input to the logic circuit 14. On the other hand, the phase information phii-1 of previous time is input from the register circuit 15 to the logic circuit 14, phii is selected from the information of Ti and phii-1 to select the phase of carrier of the oscillation circuit 17. The carrier having this phase is amplitude-modulated with the single polarity signal at the amplitude modulation circuit 16 and output to the terminal 18. Accordingly, since the phase modulation depending on the time is used, the improvement of transmission distortion can be expected.
JP5346379A 1979-05-02 1979-05-02 Amplitude-phase modulation system of adaptive type Pending JPS55147061A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5346379A JPS55147061A (en) 1979-05-02 1979-05-02 Amplitude-phase modulation system of adaptive type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5346379A JPS55147061A (en) 1979-05-02 1979-05-02 Amplitude-phase modulation system of adaptive type

Publications (1)

Publication Number Publication Date
JPS55147061A true JPS55147061A (en) 1980-11-15

Family

ID=12943547

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5346379A Pending JPS55147061A (en) 1979-05-02 1979-05-02 Amplitude-phase modulation system of adaptive type

Country Status (1)

Country Link
JP (1) JPS55147061A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019311B3 (en) * 2004-04-14 2005-11-10 Atmel Germany Gmbh Method and device for wireless data transmission

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004019311B3 (en) * 2004-04-14 2005-11-10 Atmel Germany Gmbh Method and device for wireless data transmission
US7359472B2 (en) 2004-04-14 2008-04-15 Atmel Germany Gmbh Method and apparatus for wireless data transmission

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