JPS5687965A - Fsk signal demodulation circuit - Google Patents

Fsk signal demodulation circuit

Info

Publication number
JPS5687965A
JPS5687965A JP16499579A JP16499579A JPS5687965A JP S5687965 A JPS5687965 A JP S5687965A JP 16499579 A JP16499579 A JP 16499579A JP 16499579 A JP16499579 A JP 16499579A JP S5687965 A JPS5687965 A JP S5687965A
Authority
JP
Japan
Prior art keywords
input
fsk signal
output
interruption
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
JP16499579A
Other languages
Japanese (ja)
Inventor
Teruo Tobe
Kunio Nozawa
Osamu Yoshida
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP16499579A priority Critical patent/JPS5687965A/en
Publication of JPS5687965A publication Critical patent/JPS5687965A/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 enable to demodulate a FSK signal with a simple adjustment, by counting the clock signal with the pulse having the density according to the frequency of FSK signal and obtaining the output of level according to the result of operation with the reference value in the memory. CONSTITUTION:A FSK signal (a) input to a limiter amplifier 1 is input to a differentiating circuit 5 as a rectangular wave b. The differentiation output c is input to a microprocessor 6, this is received at an interruption input section 6a and the interruption signal is input to the operation section 6d. The operation section 6d reads out the content of the counter 6b counting the clock from the clock source 6c every input of interruption and resets the counter 6b after that. Next, the data of ROM 6e is read out for subtraction, and the flip flop 6f is set to high or low depending on the positive or negative value of the result. Thus, the demodulated output being the output (d) of the flip flop 6f is obtained.
JP16499579A 1979-12-19 1979-12-19 Fsk signal demodulation circuit Pending JPS5687965A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16499579A JPS5687965A (en) 1979-12-19 1979-12-19 Fsk signal demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16499579A JPS5687965A (en) 1979-12-19 1979-12-19 Fsk signal demodulation circuit

Publications (1)

Publication Number Publication Date
JPS5687965A true JPS5687965A (en) 1981-07-17

Family

ID=15803834

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16499579A Pending JPS5687965A (en) 1979-12-19 1979-12-19 Fsk signal demodulation circuit

Country Status (1)

Country Link
JP (1) JPS5687965A (en)

Similar Documents

Publication Publication Date Title
ES489554A1 (en) Waveform correction circuit.
JPS5793704A (en) Fm demodulation circuit
JPS5687965A (en) Fsk signal demodulation circuit
JPS54101651A (en) Fm demodulator circuit
JPS56143018A (en) Noise rejecting circuit
JPS5666907A (en) Fm demodulator
JPS57201308A (en) Frequency demodulating circuit
JPS5627581A (en) Signal processor
JPS5365648A (en) Digital fsk
JPS52152104A (en) Multi-frequency signal receiver
JPS5327341A (en) Cubing circuit
JPS5382154A (en) Digital fm demodulating system
JPS52131767A (en) Frequency detector
JPS5796255A (en) Sludge detector
JPS53106108A (en) Signal transmitting circuit
JPS5366323A (en) Frequency control circuit
JPS55693A (en) Tuner
JPS57182834A (en) State change detecting circuit
JPS5458185A (en) Program signal generator
JPS5264820A (en) Fsk signal reception unit
JPS5765945A (en) Demodulating circuit
JPS5786780A (en) Electronic watch
JPS56161749A (en) Fsk signal demodulating system
LIBENSEN Some characteristics of the output response in a signal processing system with hyperbolic frequency modulation
JPS5441781A (en) Frequency discrimination circuit