JPS5590164A - Malfunction preventive unit of fsk receiver of carrier telegraph unit - Google Patents

Malfunction preventive unit of fsk receiver of carrier telegraph unit

Info

Publication number
JPS5590164A
JPS5590164A JP16119278A JP16119278A JPS5590164A JP S5590164 A JPS5590164 A JP S5590164A JP 16119278 A JP16119278 A JP 16119278A JP 16119278 A JP16119278 A JP 16119278A JP S5590164 A JPS5590164 A JP S5590164A
Authority
JP
Japan
Prior art keywords
comparator
input signal
unit
pll8
agrees
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
JP16119278A
Other languages
Japanese (ja)
Other versions
JPS635940B2 (en
Inventor
Akira Igarashi
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.)
Nohmi Bosai Ltd
Original Assignee
Nohmi Bosai Kogyo 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 Nohmi Bosai Kogyo Co Ltd filed Critical Nohmi Bosai Kogyo Co Ltd
Priority to JP16119278A priority Critical patent/JPS5590164A/en
Publication of JPS5590164A publication Critical patent/JPS5590164A/en
Publication of JPS635940B2 publication Critical patent/JPS635940B2/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
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/14—Demodulator circuits; Receiver 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 prevent malfunction by a simple circuit by giving hysteresis characteristics to the displacement of an output signal attending that of an input signal by feeding the output of a voltage control oscillator back to the front stage of a phase comparator. CONSTITUTION:This unit consists of limiter 3, voltage control oscillator 7, LPF6, phase comparator 5, feedback circuit 12, voltage comparator 10, etc. Here, PLL8 is composed of oscillator 5, LPF6 and phase comparator 5, and modulator 4 of this PLL8, comparator 10, and a reference voltage generator. When PLL8 is locked to input signal fh or fl, it agrees with f0', but if mixing noise displaces fh or fl, limiter 3 performs cross modulation by f0', so that the input signal will be pulled toward the f0' side to fs. Therefore, it noises continues, the input signal is cross-modulated by f0 locked to fs cross-modulated at the previous time interval and it agrees with a frequency obtained by repeatedly displacing it, but momently noise disappears until fs agrees with f0, so that the output of comparator 10 will never be inverted.
JP16119278A 1978-12-28 1978-12-28 Malfunction preventive unit of fsk receiver of carrier telegraph unit Granted JPS5590164A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16119278A JPS5590164A (en) 1978-12-28 1978-12-28 Malfunction preventive unit of fsk receiver of carrier telegraph unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16119278A JPS5590164A (en) 1978-12-28 1978-12-28 Malfunction preventive unit of fsk receiver of carrier telegraph unit

Publications (2)

Publication Number Publication Date
JPS5590164A true JPS5590164A (en) 1980-07-08
JPS635940B2 JPS635940B2 (en) 1988-02-05

Family

ID=15730327

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16119278A Granted JPS5590164A (en) 1978-12-28 1978-12-28 Malfunction preventive unit of fsk receiver of carrier telegraph unit

Country Status (1)

Country Link
JP (1) JPS5590164A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298256A (en) * 1986-06-18 1987-12-25 Nec Corp Receiver for frequency shift modulation signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62298256A (en) * 1986-06-18 1987-12-25 Nec Corp Receiver for frequency shift modulation signal

Also Published As

Publication number Publication date
JPS635940B2 (en) 1988-02-05

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