JPS5735453A - Demodulator for frequency shift modulating signal - Google Patents

Demodulator for frequency shift modulating signal

Info

Publication number
JPS5735453A
JPS5735453A JP11053180A JP11053180A JPS5735453A JP S5735453 A JPS5735453 A JP S5735453A JP 11053180 A JP11053180 A JP 11053180A JP 11053180 A JP11053180 A JP 11053180A JP S5735453 A JPS5735453 A JP S5735453A
Authority
JP
Japan
Prior art keywords
circuit
pulse
inputted
signal
demodulator
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
JP11053180A
Other languages
Japanese (ja)
Other versions
JPH023580B2 (en
Inventor
Akira Horiguchi
Moichi Hirasawa
Shigeru Okamura
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 JP11053180A priority Critical patent/JPS5735453A/en
Publication of JPS5735453A publication Critical patent/JPS5735453A/en
Publication of JPH023580B2 publication Critical patent/JPH023580B2/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
    • 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 achieve an FSK demodulator with simple low pass filter excellent in the discriminating capability, by obtaining a specified logic between a signal with a given pulse width produced at the zero crossing of an FSK signal and its delay signal, and converting the pulse duty ratio. CONSTITUTION:A zero crossing point of an FSK signal through a limiter 2 is converted into a pulse 3a with a given width tau at a monostable multivibrator 3, it is inputted to a sequence circuit 8 and delayed by the time tau with a monostable multivibrator 7 and inputted to the circuit 8 as a pulse 7a. The changing points of the pulses 3a and 7a are detected at the circuit 8 and inputted to an FF9 through a gate circuit. The output of the FF9 is outputted to a filter 4 and the gate circuit 8 of the sequence circuit can be closed for a given time from the output changing points.
JP11053180A 1980-08-12 1980-08-12 Demodulator for frequency shift modulating signal Granted JPS5735453A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11053180A JPS5735453A (en) 1980-08-12 1980-08-12 Demodulator for frequency shift modulating signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11053180A JPS5735453A (en) 1980-08-12 1980-08-12 Demodulator for frequency shift modulating signal

Publications (2)

Publication Number Publication Date
JPS5735453A true JPS5735453A (en) 1982-02-26
JPH023580B2 JPH023580B2 (en) 1990-01-24

Family

ID=14538161

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11053180A Granted JPS5735453A (en) 1980-08-12 1980-08-12 Demodulator for frequency shift modulating signal

Country Status (1)

Country Link
JP (1) JPS5735453A (en)

Also Published As

Publication number Publication date
JPH023580B2 (en) 1990-01-24

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