JPS55147062A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS55147062A
JPS55147062A JP5503079A JP5503079A JPS55147062A JP S55147062 A JPS55147062 A JP S55147062A JP 5503079 A JP5503079 A JP 5503079A JP 5503079 A JP5503079 A JP 5503079A JP S55147062 A JPS55147062 A JP S55147062A
Authority
JP
Japan
Prior art keywords
integrator
output
signal
input
initial value
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
JP5503079A
Other languages
Japanese (ja)
Other versions
JPS6154301B2 (en
Inventor
Yoshihiko Akaiwa
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP5503079A priority Critical patent/JPS55147062A/en
Publication of JPS55147062A publication Critical patent/JPS55147062A/en
Publication of JPS6154301B2 publication Critical patent/JPS6154301B2/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
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers

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 reduce the variation of phase of modulated waves, by setting the initial value of the integrator in synchronizing with the input digital signal with the output in response to the input digital signal up to now and preventing the storage of integrated error. CONSTITUTION:The signal at the input terminal 41 is branched into two; one is input to the integrator 44 via the filter 43 to synchronize with the clock signal fed to the terminal 42 and to reset the initial value of the integration into zero. Another is in synchronizing with the clock signal to produce a given voltage within a given time, and this voltage value is fed to the circuit 45 which changes the value in response to the input digital signal fed up to now. Further, by using the signal adding the output of the integrator 44 with the output of the ciruit 45, phase modulation is made at the phase modulator 47. Accordingly, since the initial value of the integrator 44 is set with the output of the digital circuit 45, the error of integration can not be stored.
JP5503079A 1979-05-04 1979-05-04 Frequency modulator Granted JPS55147062A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5503079A JPS55147062A (en) 1979-05-04 1979-05-04 Frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5503079A JPS55147062A (en) 1979-05-04 1979-05-04 Frequency modulator

Publications (2)

Publication Number Publication Date
JPS55147062A true JPS55147062A (en) 1980-11-15
JPS6154301B2 JPS6154301B2 (en) 1986-11-21

Family

ID=12987259

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5503079A Granted JPS55147062A (en) 1979-05-04 1979-05-04 Frequency modulator

Country Status (1)

Country Link
JP (1) JPS55147062A (en)

Also Published As

Publication number Publication date
JPS6154301B2 (en) 1986-11-21

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