JPS567553A - Digital type fm modulator - Google Patents

Digital type fm modulator

Info

Publication number
JPS567553A
JPS567553A JP8357879A JP8357879A JPS567553A JP S567553 A JPS567553 A JP S567553A JP 8357879 A JP8357879 A JP 8357879A JP 8357879 A JP8357879 A JP 8357879A JP S567553 A JPS567553 A JP S567553A
Authority
JP
Japan
Prior art keywords
circuit
terminal
pulse
signal
switching
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
JP8357879A
Other languages
Japanese (ja)
Other versions
JPS5840387B2 (en
Inventor
Hiroshi Suzuki
Kazuaki Murota
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP8357879A priority Critical patent/JPS5840387B2/en
Publication of JPS567553A publication Critical patent/JPS567553A/en
Publication of JPS5840387B2 publication Critical patent/JPS5840387B2/en
Expired 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
    • H04L27/12—Modulator circuits; Transmitter 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 decrease the deterioration to nonlinear type amplification, by producing the frequency modulation signal in spectrum shape through almost continuous switching of the frequency and the phase at the switching circuit. CONSTITUTION:The signal of logic ''1'' is always given to the input of the first stage of the shift register 14 from the terminal 16. Shift operation is made for the delay circuit 13 with the output pulse of the shift pulse generator 17 in unit delay time tau. Each output signal of the registers 14, 151-156 corresponding to tauo+Ktau (where; tauo=mtau, K=1, 2...6) for the delay time from the circuit 13 is selected at the switching circuit 18 and fed to the output terminal 9. The signal at the terminal 9 is fed to the reset circuit 19 to form reset pulse and the circuit 13 is reset with the pulse. The circuit 18 is switched for control through the switching control circuit 21 in response to the modulator input from the input terminal 6.
JP8357879A 1979-06-29 1979-06-29 Digital FM modulator Expired JPS5840387B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8357879A JPS5840387B2 (en) 1979-06-29 1979-06-29 Digital FM modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8357879A JPS5840387B2 (en) 1979-06-29 1979-06-29 Digital FM modulator

Publications (2)

Publication Number Publication Date
JPS567553A true JPS567553A (en) 1981-01-26
JPS5840387B2 JPS5840387B2 (en) 1983-09-05

Family

ID=13806373

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8357879A Expired JPS5840387B2 (en) 1979-06-29 1979-06-29 Digital FM modulator

Country Status (1)

Country Link
JP (1) JPS5840387B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120353A (en) * 1982-01-13 1983-07-18 Fujitsu Ltd Msk modulating system
JPS58135154U (en) * 1982-03-05 1983-09-10 日立電子株式会社 MSK modulation circuit
JP2006339944A (en) * 2005-06-01 2006-12-14 Seiko Epson Corp Modulation circuit and demodulation circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120353A (en) * 1982-01-13 1983-07-18 Fujitsu Ltd Msk modulating system
JPS58135154U (en) * 1982-03-05 1983-09-10 日立電子株式会社 MSK modulation circuit
JP2006339944A (en) * 2005-06-01 2006-12-14 Seiko Epson Corp Modulation circuit and demodulation circuit
JP4701841B2 (en) * 2005-06-01 2011-06-15 セイコーエプソン株式会社 Modulation circuit and demodulation circuit

Also Published As

Publication number Publication date
JPS5840387B2 (en) 1983-09-05

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