JPS5647153A - Digital phase modulation system - Google Patents

Digital phase modulation system

Info

Publication number
JPS5647153A
JPS5647153A JP12435279A JP12435279A JPS5647153A JP S5647153 A JPS5647153 A JP S5647153A JP 12435279 A JP12435279 A JP 12435279A JP 12435279 A JP12435279 A JP 12435279A JP S5647153 A JPS5647153 A JP S5647153A
Authority
JP
Japan
Prior art keywords
input data
phase shift
shift information
corresponds
sinomegact
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
JP12435279A
Other languages
Japanese (ja)
Other versions
JPS6149865B2 (en
Inventor
Fumio Sugiyama
Tsukasa Okai
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 JP12435279A priority Critical patent/JPS5647153A/en
Publication of JPS5647153A publication Critical patent/JPS5647153A/en
Publication of JPS6149865B2 publication Critical patent/JPS6149865B2/ja
Granted 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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
    • H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation

Landscapes

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

Abstract

PURPOSE:To attain the narrow band of the spectrum of a modulated wave and also to keep envelepes constant by making use of relative phase information that corresponds to a combination of not less than three continuous bits of input data. CONSTITUTION:Every time one bit of input data 1 is inputted, relative phase shift information that corresponds to a combination of three continuous bits of input data is read out of memory 3 and applies to adder 6, where it is added of the final phase of absolute phase shift information, preceding by one time slot, from latch circuit 7, obtaining absolute phase shift information theta(t) that corresponds to input data. From this absolute phase shift information, a sine value and cosine value are operated and their results are converted into analog signals, which are applied to carrier suppression amplitude modulators 18 and 19, where carriers sinomegact and cosomegact are modulated. Then, their outputs are added together so as to obtain digital phase modulated wave sintheta(t) sinomegact+costheta(t)cosomegact.
JP12435279A 1979-09-27 1979-09-27 Digital phase modulation system Granted JPS5647153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12435279A JPS5647153A (en) 1979-09-27 1979-09-27 Digital phase modulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12435279A JPS5647153A (en) 1979-09-27 1979-09-27 Digital phase modulation system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP12026985A Division JPS615659A (en) 1985-06-03 1985-06-03 Digital phase modulating system

Publications (2)

Publication Number Publication Date
JPS5647153A true JPS5647153A (en) 1981-04-28
JPS6149865B2 JPS6149865B2 (en) 1986-10-31

Family

ID=14883249

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12435279A Granted JPS5647153A (en) 1979-09-27 1979-09-27 Digital phase modulation system

Country Status (1)

Country Link
JP (1) JPS5647153A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371751A2 (en) * 1988-11-30 1990-06-06 Motorola, Inc. Digital GMSK modulator with non integer bit interval handling
US5418819A (en) * 1991-11-18 1995-05-23 Nippon Hoso Kyokai Transmitting apparatus and receiving apparatus based on phase modulation method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0371751A2 (en) * 1988-11-30 1990-06-06 Motorola, Inc. Digital GMSK modulator with non integer bit interval handling
US5418819A (en) * 1991-11-18 1995-05-23 Nippon Hoso Kyokai Transmitting apparatus and receiving apparatus based on phase modulation method

Also Published As

Publication number Publication date
JPS6149865B2 (en) 1986-10-31

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