JPS56169462A - Demodulation circuit for frequency shift modulation signal - Google Patents

Demodulation circuit for frequency shift modulation signal

Info

Publication number
JPS56169462A
JPS56169462A JP7394980A JP7394980A JPS56169462A JP S56169462 A JPS56169462 A JP S56169462A JP 7394980 A JP7394980 A JP 7394980A JP 7394980 A JP7394980 A JP 7394980A JP S56169462 A JPS56169462 A JP S56169462A
Authority
JP
Japan
Prior art keywords
signal
circuit
discrimination
sequence
modulation signal
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
JP7394980A
Other languages
Japanese (ja)
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 JP7394980A priority Critical patent/JPS56169462A/en
Publication of JPS56169462A publication Critical patent/JPS56169462A/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 prevent an erroneous discrimination due to superposition of noise and to increase the reliability of demodulated output, by making the discrimination easy, through the conversion of an input signal to a pulse signal having a large impulse ratio. CONSTITUTION:An FS modulation signal 1a is inputted to a multi-vibrator 2, which detects the zero cross point of the signal 1a, and a generated pulse signal 2a is transmitted to a delay circuit 6 consisting of a sequence circuit 5 and a multivibrator. This delay circuit 6 delays the signal 2a by a given time to transmit a signal 6a to a sequence circuit 7. On the other hand, the signal 2a is supplied to the sequence circuit 5, and the sequence circuits 5, 7 detect the time point of leading and trailing, and they are fed to a set/reset terminal of an FF8 as signals 5a, 7a. Further, the output 8a of this FF8 is fed to a judging circuit 4 as a signal 3a via a low pass filter 3 and the discrimination of either 1 or 0 is made with a specified discrimination level to obtain a demodulated output 4a.
JP7394980A 1980-05-30 1980-05-30 Demodulation circuit for frequency shift modulation signal Pending JPS56169462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7394980A JPS56169462A (en) 1980-05-30 1980-05-30 Demodulation circuit for frequency shift modulation signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7394980A JPS56169462A (en) 1980-05-30 1980-05-30 Demodulation circuit for frequency shift modulation signal

Publications (1)

Publication Number Publication Date
JPS56169462A true JPS56169462A (en) 1981-12-26

Family

ID=13532840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7394980A Pending JPS56169462A (en) 1980-05-30 1980-05-30 Demodulation circuit for frequency shift modulation signal

Country Status (1)

Country Link
JP (1) JPS56169462A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS639211A (en) * 1986-06-28 1988-01-14 Nec Corp Fm demodulation circuit
JPH0292003A (en) * 1988-09-28 1990-03-30 Ando Electric Co Ltd Circuit for eliminating transient phenomenon in pulse count detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS639211A (en) * 1986-06-28 1988-01-14 Nec Corp Fm demodulation circuit
JPH0292003A (en) * 1988-09-28 1990-03-30 Ando Electric Co Ltd Circuit for eliminating transient phenomenon in pulse count detector
JPH0773166B2 (en) * 1988-09-28 1995-08-02 安藤電気株式会社 Transient elimination circuit for pulse count detector

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