JPS5495165A - Fsk modulator - Google Patents

Fsk modulator

Info

Publication number
JPS5495165A
JPS5495165A JP249878A JP249878A JPS5495165A JP S5495165 A JPS5495165 A JP S5495165A JP 249878 A JP249878 A JP 249878A JP 249878 A JP249878 A JP 249878A JP S5495165 A JPS5495165 A JP S5495165A
Authority
JP
Japan
Prior art keywords
frequency
oscillated
modulation signal
pll
programmable counter
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
JP249878A
Other languages
Japanese (ja)
Inventor
Akitaka Murozono
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP249878A priority Critical patent/JPS5495165A/en
Publication of JPS5495165A publication Critical patent/JPS5495165A/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
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits

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 produce a high-frequency stability and small-size FSK modulator which can set an oscillated frequency arbitrarily without adjustment. CONSTITUTION:The phase of the oscillated frequency of srystal oscillator 5 and that of the output frequency of programmable counter 4 are compared with each other, and phase lock loop PLL is constituted by phase comparator 1 LPF2 voltage control oscillator 3 programmable counter 4 phase comparator 1. In this constitution, when the oscillated frequency of VCO3 is f and the frequency division ratio of programmable counter 4 is N, oscillated frequency f0 of crystal oscillator 5 makes f=Nf0 by PLL. When frequency division ratio N is controlled by the modulation signal, a high-stability frequency modulation signal can be obtained if the response speed of PLL is adequately higher than the change speed of the modulation signal.
JP249878A 1978-01-12 1978-01-12 Fsk modulator Pending JPS5495165A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP249878A JPS5495165A (en) 1978-01-12 1978-01-12 Fsk modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP249878A JPS5495165A (en) 1978-01-12 1978-01-12 Fsk modulator

Publications (1)

Publication Number Publication Date
JPS5495165A true JPS5495165A (en) 1979-07-27

Family

ID=11531016

Family Applications (1)

Application Number Title Priority Date Filing Date
JP249878A Pending JPS5495165A (en) 1978-01-12 1978-01-12 Fsk modulator

Country Status (1)

Country Link
JP (1) JPS5495165A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01115247A (en) * 1987-10-29 1989-05-08 Hochiki Corp Data transmission equipment
JPH01115249A (en) * 1987-10-29 1989-05-08 Hochiki Corp Data transmission equipment
JPH01160141A (en) * 1987-12-16 1989-06-23 Hochiki Corp Data transmission equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01115247A (en) * 1987-10-29 1989-05-08 Hochiki Corp Data transmission equipment
JPH01115249A (en) * 1987-10-29 1989-05-08 Hochiki Corp Data transmission equipment
JPH01160141A (en) * 1987-12-16 1989-06-23 Hochiki Corp Data transmission equipment

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