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JPS5573163A - Differential encoder - Google Patents

Differential encoder

Info

Publication number
JPS5573163A
JPS5573163A JP14601078A JP14601078A JPS5573163A JP S5573163 A JPS5573163 A JP S5573163A JP 14601078 A JP14601078 A JP 14601078A JP 14601078 A JP14601078 A JP 14601078A JP S5573163 A JPS5573163 A JP S5573163A
Authority
JP
Japan
Prior art keywords
output
symbols
rom4
differential encoder
suited
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
JP14601078A
Other languages
Japanese (ja)
Inventor
Kunihiro Yamada
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14601078A priority Critical patent/JPS5573163A/en
Publication of JPS5573163A publication Critical patent/JPS5573163A/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
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
    • H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers

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 realize an differential encoder which is suited to any code type the modulator circuit requests by obtaining the output symbols to show the relative and absolute phases through the output terminal of the ROM. CONSTITUTION:ROM4 incorporates address input terminals A0, A1 and A2 plus reading output ends D0, D1 and D2; and the output data given from end DO of ROM4 is delayed by FF6. Here input symbols SSYM0 and SSYM1 are supplied to terminals A1 and A2, and the output data is applied to address input end A0. Thus the output symbols are obtained through output ends D1 and D2 of ROM4; while the signal showing the absolute phase of the output symbol or the absolute phase of the center point of the gathering of plural symbols to which the output symbol belongs is obtained. As a result, a differential encoder can be realized to be suited to any code type the modulator circuit requests.
JP14601078A 1978-11-28 1978-11-28 Differential encoder Pending JPS5573163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14601078A JPS5573163A (en) 1978-11-28 1978-11-28 Differential encoder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14601078A JPS5573163A (en) 1978-11-28 1978-11-28 Differential encoder

Publications (1)

Publication Number Publication Date
JPS5573163A true JPS5573163A (en) 1980-06-02

Family

ID=15398043

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14601078A Pending JPS5573163A (en) 1978-11-28 1978-11-28 Differential encoder

Country Status (1)

Country Link
JP (1) JPS5573163A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57141165A (en) * 1981-01-22 1982-09-01 Codex Corp Data transmitter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5352043A (en) * 1976-10-22 1978-05-12 Fujitsu Ltd Modulating equipment for data transmission

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5352043A (en) * 1976-10-22 1978-05-12 Fujitsu Ltd Modulating equipment for data transmission

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57141165A (en) * 1981-01-22 1982-09-01 Codex Corp Data transmitter

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