JPS57210749A - Pulse position modulation synchronizing system - Google Patents

Pulse position modulation synchronizing system

Info

Publication number
JPS57210749A
JPS57210749A JP9454881A JP9454881A JPS57210749A JP S57210749 A JPS57210749 A JP S57210749A JP 9454881 A JP9454881 A JP 9454881A JP 9454881 A JP9454881 A JP 9454881A JP S57210749 A JPS57210749 A JP S57210749A
Authority
JP
Japan
Prior art keywords
word
information
pulse
synchronizing
pulses
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
JP9454881A
Other languages
Japanese (ja)
Inventor
Shoichi Naruse
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 JP9454881A priority Critical patent/JPS57210749A/en
Publication of JPS57210749A publication Critical patent/JPS57210749A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4902—Pulse width modulation; Pulse position modulation

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE:To obtain a synchronizing system of a pulse position modulation(PPM) which eliminates the need for the provision of a time slot for synchronism and increase the code transmission efficiency, by inserting a synchronizing pulse in an information word at each word number. CONSTITUTION:Each two-bit of a data to be transmitted is modulated into 4 information pulse positions as shown in (a)-(d), for example, to constitute an information word. In transmitting the information, the information word is sectioned into blocks as M word, N word, etc. and pulses P1-P4 for synchronism are inserted as shown in Figure to the first word of each block. The synchronizing pulses P1 and P3 of the M word block are inserted to the position (a) and those P2 and P<4> of the N word block are inserted at the position (d). In the words including these synchronizing pulses, if no information pulse is given other than the synchronizing pulse, the synchronizing pulses are commonly used for the information pulse.
JP9454881A 1981-06-19 1981-06-19 Pulse position modulation synchronizing system Pending JPS57210749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9454881A JPS57210749A (en) 1981-06-19 1981-06-19 Pulse position modulation synchronizing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9454881A JPS57210749A (en) 1981-06-19 1981-06-19 Pulse position modulation synchronizing system

Publications (1)

Publication Number Publication Date
JPS57210749A true JPS57210749A (en) 1982-12-24

Family

ID=14113358

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9454881A Pending JPS57210749A (en) 1981-06-19 1981-06-19 Pulse position modulation synchronizing system

Country Status (1)

Country Link
JP (1) JPS57210749A (en)

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