JPS5525223A - Phase continuous fsk modulation system - Google Patents

Phase continuous fsk modulation system

Info

Publication number
JPS5525223A
JPS5525223A JP9735378A JP9735378A JPS5525223A JP S5525223 A JPS5525223 A JP S5525223A JP 9735378 A JP9735378 A JP 9735378A JP 9735378 A JP9735378 A JP 9735378A JP S5525223 A JPS5525223 A JP S5525223A
Authority
JP
Japan
Prior art keywords
output
continuous
accumulator
seconds
stored
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
JP9735378A
Other languages
Japanese (ja)
Other versions
JPS6334666B2 (en
Inventor
Hideo Kobayashi
Katsuhiko Furuya
Hidetaka Yanagidaira
Sotokichi Shintani
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP9735378A priority Critical patent/JPS5525223A/en
Publication of JPS5525223A publication Critical patent/JPS5525223A/en
Publication of JPS6334666B2 publication Critical patent/JPS6334666B2/ja
Granted 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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
    • H04L27/2021—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained
    • H04L27/2025—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change per symbol period is not constrained in which the phase changes in a piecewise linear manner within each symbol period

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 occupied band width as well as to improve the error rate property by securing the continuous phase at the exchange point of the modulation element with the correlation ensured and then giving the redundancy to the signal between the adjacent elements. CONSTITUTION:The transmission data is supplied through input terminal 100 in the form of ''1'' and ''0''. For the supplied data, the continuous three bits (ak, ak-1 and ak-2) are stored in shift register 1 to be stored to deliver the modulation exponents (2ak-ak-1-ak-2) to output 102 via the code converter of 2. The product of output 102 and 103 is obtained through multiplier M, and thus the shift component is obtained at output 104 from the carrier frequency which varies for 1/fs(fs=clock frequency) seconds. The sum of output 104 and 105 is secured by adder A, and the cumulative addition is given by accumulator 3 with every 1/fs seconds. The output of accumulator 3 is converted to the amplitude value of the cosine wave through the phase value and via conversion table 4 and then turned to a continuous waveform through D/A converter 5.
JP9735378A 1978-08-11 1978-08-11 Phase continuous fsk modulation system Granted JPS5525223A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9735378A JPS5525223A (en) 1978-08-11 1978-08-11 Phase continuous fsk modulation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9735378A JPS5525223A (en) 1978-08-11 1978-08-11 Phase continuous fsk modulation system

Publications (2)

Publication Number Publication Date
JPS5525223A true JPS5525223A (en) 1980-02-22
JPS6334666B2 JPS6334666B2 (en) 1988-07-12

Family

ID=14190117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9735378A Granted JPS5525223A (en) 1978-08-11 1978-08-11 Phase continuous fsk modulation system

Country Status (1)

Country Link
JP (1) JPS5525223A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0192821A (en) * 1987-08-28 1989-04-12 Yokogawa Hewlett Packard Ltd Digital frequency synthesizer
JPH0647774U (en) * 1983-10-06 1994-06-28 カルル・フロイデンベルク Fluid sealing device
JP2002034985A (en) * 2000-07-27 2002-02-05 Aloka Co Ltd Ultrasonograph

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0567650B1 (en) * 1991-11-18 1996-06-12 Nippon Hoso Kyokai Phase-modulation transmitter and receiver

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0647774U (en) * 1983-10-06 1994-06-28 カルル・フロイデンベルク Fluid sealing device
JPH0192821A (en) * 1987-08-28 1989-04-12 Yokogawa Hewlett Packard Ltd Digital frequency synthesizer
JP2002034985A (en) * 2000-07-27 2002-02-05 Aloka Co Ltd Ultrasonograph
JP4698003B2 (en) * 2000-07-27 2011-06-08 アロカ株式会社 Ultrasonic diagnostic equipment

Also Published As

Publication number Publication date
JPS6334666B2 (en) 1988-07-12

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