JPS57129056A - Carrier wave extracting device - Google Patents

Carrier wave extracting device

Info

Publication number
JPS57129056A
JPS57129056A JP1390281A JP1390281A JPS57129056A JP S57129056 A JPS57129056 A JP S57129056A JP 1390281 A JP1390281 A JP 1390281A JP 1390281 A JP1390281 A JP 1390281A JP S57129056 A JPS57129056 A JP S57129056A
Authority
JP
Japan
Prior art keywords
wave
frequency
carrier wave
signal
output
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
JP1390281A
Other languages
Japanese (ja)
Inventor
Toshitake Noguchi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1390281A priority Critical patent/JPS57129056A/en
Publication of JPS57129056A publication Critical patent/JPS57129056A/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 extract a carrier wave irrespective of relation of a deviation frequency value, by controlling an output which has delayed a frequency shift- keying modulated wave by an output which has discriminated frequency of the modulated wave, and extracting the carrier wave of the modulated wave. CONSTITUTION:A frequency shift-keying modulated wave (a) being an input signal is demodulated in a frequency discriminator 5, obtains a demodulating signal (g), and also is delayed by the time required for obtaining the demodulating signal (g) by a delaying circuit 6. Subsequently, an output (h) of the delaying circuit 6 is applied to a carrier extracting circuit 7 provided with a sampling gate, is controlled by the demodulating signal (g), a signal wave of a necessary frequency is selected, and a carrier wave (i) is extracted.
JP1390281A 1981-02-02 1981-02-02 Carrier wave extracting device Pending JPS57129056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1390281A JPS57129056A (en) 1981-02-02 1981-02-02 Carrier wave extracting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1390281A JPS57129056A (en) 1981-02-02 1981-02-02 Carrier wave extracting device

Publications (1)

Publication Number Publication Date
JPS57129056A true JPS57129056A (en) 1982-08-10

Family

ID=11846098

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1390281A Pending JPS57129056A (en) 1981-02-02 1981-02-02 Carrier wave extracting device

Country Status (1)

Country Link
JP (1) JPS57129056A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5580949A (en) * 1978-11-04 1980-06-18 Nec Corp Carrier wave regenerating circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5580949A (en) * 1978-11-04 1980-06-18 Nec Corp Carrier wave regenerating circuit

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