JPS5466012A - Frame phase synchronizer - Google Patents

Frame phase synchronizer

Info

Publication number
JPS5466012A
JPS5466012A JP13317977A JP13317977A JPS5466012A JP S5466012 A JPS5466012 A JP S5466012A JP 13317977 A JP13317977 A JP 13317977A JP 13317977 A JP13317977 A JP 13317977A JP S5466012 A JPS5466012 A JP S5466012A
Authority
JP
Japan
Prior art keywords
registers
signal
selective
error rate
phase
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
JP13317977A
Other languages
Japanese (ja)
Other versions
JPS5650460B2 (en
Inventor
Yoichi Sakai
Masahiro Ko
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.)
NTT Inc
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 JP13317977A priority Critical patent/JPS5466012A/en
Publication of JPS5466012A publication Critical patent/JPS5466012A/en
Publication of JPS5650460B2 publication Critical patent/JPS5650460B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
    • H04J3/0626—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers plesiochronous multiplexing systems, e.g. plesiochronous digital hierarchy [PDH], jitter attenuators

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To attain the improvement of speech quality and a decrease in error rate by phase-comparing the write timing of a plural number of shift registers with that of a signal selecting each paralleled output and by generating a selective signal corresponding to its result. CONSTITUTION:Frame synchronous circuit 18 detects the frame synchronism of time-division multiple PCM signals, and shift registers 20 22 have a number of bits euivalent to the word length of the signals. Then, the write timing of registers 20 22 is phase-compared 23 with the timing of a selective signal selecting respective paralleled outputs of registers 20 22. Corresponding to this result, selective- signal circuit 23 is controlled to decide whether extraction should be done indluding the shift register where the word of fixed codes of the PCM signal or skipping over the shift register. In this way, the selective signal is generated so as to use registers as both an elastic storage and series-parallel converter circuit, thereby improving speech quality and decreasing an error rate.
JP13317977A 1977-11-07 1977-11-07 Frame phase synchronizer Granted JPS5466012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13317977A JPS5466012A (en) 1977-11-07 1977-11-07 Frame phase synchronizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13317977A JPS5466012A (en) 1977-11-07 1977-11-07 Frame phase synchronizer

Publications (2)

Publication Number Publication Date
JPS5466012A true JPS5466012A (en) 1979-05-28
JPS5650460B2 JPS5650460B2 (en) 1981-11-28

Family

ID=15098520

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13317977A Granted JPS5466012A (en) 1977-11-07 1977-11-07 Frame phase synchronizer

Country Status (1)

Country Link
JP (1) JPS5466012A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56136057A (en) * 1980-03-04 1981-10-23 Western Electric Co Adaptive memory
US8002863B2 (en) 2005-06-23 2011-08-23 Honda Motor Co., Ltd. Engine air cleaner and device for mounting air cleaner on engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56136057A (en) * 1980-03-04 1981-10-23 Western Electric Co Adaptive memory
US8002863B2 (en) 2005-06-23 2011-08-23 Honda Motor Co., Ltd. Engine air cleaner and device for mounting air cleaner on engine

Also Published As

Publication number Publication date
JPS5650460B2 (en) 1981-11-28

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