JPS5746562A - Fsk signal demodulating device - Google Patents

Fsk signal demodulating device

Info

Publication number
JPS5746562A
JPS5746562A JP55123052A JP12305280A JPS5746562A JP S5746562 A JPS5746562 A JP S5746562A JP 55123052 A JP55123052 A JP 55123052A JP 12305280 A JP12305280 A JP 12305280A JP S5746562 A JPS5746562 A JP S5746562A
Authority
JP
Japan
Prior art keywords
output
frequency
circuit
counter
timer
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
JP55123052A
Other languages
Japanese (ja)
Inventor
Akira Horiguchi
Moichi Hirasawa
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 JP55123052A priority Critical patent/JPS5746562A/en
Publication of JPS5746562A publication Critical patent/JPS5746562A/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
    • H04L27/14—Demodulator circuits; Receiver circuits
    • H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
    • H04L27/1563—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using transition or level detection

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 eliminate signal distortion, by adding a circuit, which obtains a code conversion point, into a circuit which discriminates the duty ratio of the output of a digital PLL circuit. CONSTITUTION:The output of a digital PLL circuit which has different duty ratios for the mark frequency and the space frequency of an FSK signal is inputted from a terminal 5, and a discriminating circuit 6 discriminates the mark frequency or the space frequency on a basis of the duty ratio. In case the frequency is changed from the space frequency fH to the mark frequency fL, a timer 122 to measure the time of 1/2fL is operated by the output of a differentiator 8, which detects the rise of the input signal, and outputs of timer control gates 101-103, and counting of a counter 181 is started. After the time of 1/2fL, the counter 181 is switched to down counting by the output of the timer 122, and the clock frequency is multiplied by fH/fL-1. Next, when the output of a latch 20 is switched by the output of the counter 181, the demodulation output is delayed from the code conversion point by 1/2fL.
JP55123052A 1980-09-04 1980-09-04 Fsk signal demodulating device Pending JPS5746562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55123052A JPS5746562A (en) 1980-09-04 1980-09-04 Fsk signal demodulating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55123052A JPS5746562A (en) 1980-09-04 1980-09-04 Fsk signal demodulating device

Publications (1)

Publication Number Publication Date
JPS5746562A true JPS5746562A (en) 1982-03-17

Family

ID=14851005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55123052A Pending JPS5746562A (en) 1980-09-04 1980-09-04 Fsk signal demodulating device

Country Status (1)

Country Link
JP (1) JPS5746562A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7288303B2 (en) 2004-06-08 2007-10-30 Ngk Insulators, Ltd. Structures of brittle materials and metals
US7521870B2 (en) 2004-06-08 2009-04-21 Ngk Insulators, Ltd. Luminous containers and those for high pressure discharge lamps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7288303B2 (en) 2004-06-08 2007-10-30 Ngk Insulators, Ltd. Structures of brittle materials and metals
US7521870B2 (en) 2004-06-08 2009-04-21 Ngk Insulators, Ltd. Luminous containers and those for high pressure discharge lamps

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