JPS5639661A - Fsk demodulator - Google Patents

Fsk demodulator

Info

Publication number
JPS5639661A
JPS5639661A JP11411679A JP11411679A JPS5639661A JP S5639661 A JPS5639661 A JP S5639661A JP 11411679 A JP11411679 A JP 11411679A JP 11411679 A JP11411679 A JP 11411679A JP S5639661 A JPS5639661 A JP S5639661A
Authority
JP
Japan
Prior art keywords
lpf14
component
input signal
frequency
band
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
JP11411679A
Other languages
Japanese (ja)
Inventor
Takao Ueda
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11411679A priority Critical patent/JPS5639661A/en
Publication of JPS5639661A publication Critical patent/JPS5639661A/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

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 make it possible to demodulates an FSK signal even when D/U is less than one, by providing LPF with a fixed band at the output side of a frequency discriminator. CONSTITUTION:An input signal is supplied to broad-band frequency discriminator 13 via amplitude limiter 12 and its demodulated signal component is supplied to LPF14. Then, LPF14 attenuates greatly a component higher than a carrier freqency, but never attenuates a component lower than the carrier frequency and twice the band width of the input signal. The output of LPF14 is detected by detector 15 and then outputted by way of LPF16 that permits only the detection signal component to pass through it. In this case, an influence of a quadratic higher harmonic when D/U approximates to one can be removed by setting the cut-off frequency of LPF14 four times more as much as the band width of the input signal.
JP11411679A 1979-09-07 1979-09-07 Fsk demodulator Pending JPS5639661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11411679A JPS5639661A (en) 1979-09-07 1979-09-07 Fsk demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11411679A JPS5639661A (en) 1979-09-07 1979-09-07 Fsk demodulator

Publications (1)

Publication Number Publication Date
JPS5639661A true JPS5639661A (en) 1981-04-15

Family

ID=14629529

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11411679A Pending JPS5639661A (en) 1979-09-07 1979-09-07 Fsk demodulator

Country Status (1)

Country Link
JP (1) JPS5639661A (en)

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