JPS57135555A - Phase continuous fsk modulating circuit - Google Patents

Phase continuous fsk modulating circuit

Info

Publication number
JPS57135555A
JPS57135555A JP2170281A JP2170281A JPS57135555A JP S57135555 A JPS57135555 A JP S57135555A JP 2170281 A JP2170281 A JP 2170281A JP 2170281 A JP2170281 A JP 2170281A JP S57135555 A JPS57135555 A JP S57135555A
Authority
JP
Japan
Prior art keywords
output
frequency divider
data signal
frequency
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
JP2170281A
Other languages
Japanese (ja)
Inventor
Shigeo Nakajima
Masato Mori
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 JP2170281A priority Critical patent/JPS57135555A/en
Publication of JPS57135555A publication Critical patent/JPS57135555A/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
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2021—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained
    • H04L27/2025—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained in which the phase changes in a piecewise linear manner within each symbol period

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 facilitate adjustment with simple constitution by providing a frequency division ratio setting circuit which varies the frequency division ratio of a variable frequency divider according to the mark and space of a modulated data signal. CONSTITUTION:An output wave from an oscillator 13 is divided into two; one is processed through the frequency division of a fixed frequency divider 14, whose output is applied to a clock output terminal 15 and a data signal pattern detecting circuit 16. The other is inputted to a variable frequency divider 17. A modulated data signal for a mark and space inputted from a terminal 18 is inputted to the data signal pattern detecting circuit 16, whose output is applied from a switch control circuit 27 to the frequency divider 17. In this case, the output of the circuit 27 permits a switch 28 to switch and set a number for frequency division, thus varying the output frequency of the frequency divider 17. The output of this frequency divider 17 is passed through a BPF34 to eliminate higher harmonic component more than double as high as the modulated wave, so that the remainder appears at a terminal 35.
JP2170281A 1981-02-16 1981-02-16 Phase continuous fsk modulating circuit Pending JPS57135555A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2170281A JPS57135555A (en) 1981-02-16 1981-02-16 Phase continuous fsk modulating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2170281A JPS57135555A (en) 1981-02-16 1981-02-16 Phase continuous fsk modulating circuit

Publications (1)

Publication Number Publication Date
JPS57135555A true JPS57135555A (en) 1982-08-21

Family

ID=12062386

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2170281A Pending JPS57135555A (en) 1981-02-16 1981-02-16 Phase continuous fsk modulating circuit

Country Status (1)

Country Link
JP (1) JPS57135555A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329258A (en) * 1992-06-26 1994-07-12 Nec Corporation Multilevel FSK modulator having phase locked loop with controlled transient response

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5329258A (en) * 1992-06-26 1994-07-12 Nec Corporation Multilevel FSK modulator having phase locked loop with controlled transient response

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