JPS5685960A - Phase modulator - Google Patents

Phase modulator

Info

Publication number
JPS5685960A
JPS5685960A JP16330679A JP16330679A JPS5685960A JP S5685960 A JPS5685960 A JP S5685960A JP 16330679 A JP16330679 A JP 16330679A JP 16330679 A JP16330679 A JP 16330679A JP S5685960 A JPS5685960 A JP S5685960A
Authority
JP
Japan
Prior art keywords
modulated wave
memory
bit
sampling
terminal
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
JP16330679A
Other languages
Japanese (ja)
Inventor
Katsumi Kobayashi
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 JP16330679A priority Critical patent/JPS5685960A/en
Publication of JPS5685960A publication Critical patent/JPS5685960A/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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2092—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner with digital generation of the modulated carrier (does not include the modulation of a digitally generated 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 make the circuit small-sized and simply by storing the values which are obtained by executing multiplication, addition and cos operation in advance, in the exclusive memory, in the phase modulator obtaining a sampling phase modulated wave by the digital processing. CONSTITUTION:The sampling value m(kT) of a modulated wave of l bit is provided as an address to the read-only memory 21 from the input terminal 11. Also, the counting contents of the counter 23 of n bit for counting the sampling pulse are provided as an address to the memory 21 from the terminal 22. In the memory 21 is stored cos [2pikfoT+kpm(kT)]. As for the memory 21, the data sampling value ep(kT) of a phase modulated wave of l bit is read out to the terminal 19 by the sampling value m(kT) of a modulated wave from the terminal 11 and the output of the counter 23 of n bit, and a phase modulated wave can be obtained. In said expression, m(kT), kp, T and fo are the sampling value of the modulated wave m(t), the constant, the sampling period and the carrier-frequency, respectively.
JP16330679A 1979-12-14 1979-12-14 Phase modulator Pending JPS5685960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16330679A JPS5685960A (en) 1979-12-14 1979-12-14 Phase modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16330679A JPS5685960A (en) 1979-12-14 1979-12-14 Phase modulator

Publications (1)

Publication Number Publication Date
JPS5685960A true JPS5685960A (en) 1981-07-13

Family

ID=15771314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16330679A Pending JPS5685960A (en) 1979-12-14 1979-12-14 Phase modulator

Country Status (1)

Country Link
JP (1) JPS5685960A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61208303A (en) * 1985-03-07 1986-09-16 テクトロニツクス・インコーポレイテツド Azimuth modulation waveform generator
JPS61234153A (en) * 1985-04-10 1986-10-18 Hitachi Ltd Digital modulator
JPS62196906A (en) * 1986-02-25 1987-08-31 Ayao Miura Frequency modulator
JPH0192821A (en) * 1987-08-28 1989-04-12 Yokogawa Hewlett Packard Ltd Digital frequency synthesizer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5060173A (en) * 1973-09-26 1975-05-23

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5060173A (en) * 1973-09-26 1975-05-23

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61208303A (en) * 1985-03-07 1986-09-16 テクトロニツクス・インコーポレイテツド Azimuth modulation waveform generator
JPH0462605B2 (en) * 1985-03-07 1992-10-07 Tektronix Inc
JPS61234153A (en) * 1985-04-10 1986-10-18 Hitachi Ltd Digital modulator
JPS62196906A (en) * 1986-02-25 1987-08-31 Ayao Miura Frequency modulator
JPH0192821A (en) * 1987-08-28 1989-04-12 Yokogawa Hewlett Packard Ltd Digital frequency synthesizer

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