JPS54134510A - Independent synchronization unit - Google Patents

Independent synchronization unit

Info

Publication number
JPS54134510A
JPS54134510A JP4250278A JP4250278A JPS54134510A JP S54134510 A JPS54134510 A JP S54134510A JP 4250278 A JP4250278 A JP 4250278A JP 4250278 A JP4250278 A JP 4250278A JP S54134510 A JPS54134510 A JP S54134510A
Authority
JP
Japan
Prior art keywords
output
sampling frequency
frequency
synchronization unit
taken out
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
JP4250278A
Other languages
Japanese (ja)
Other versions
JPS6311819B2 (en
Inventor
Akira Kanemasa
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 JP4250278A priority Critical patent/JPS54134510A/en
Publication of JPS54134510A publication Critical patent/JPS54134510A/en
Publication of JPS6311819B2 publication Critical patent/JPS6311819B2/ja
Granted 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
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/05—Electric or magnetic storage of signals before transmitting or retransmitting for changing the transmission rate

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To obtain an independent synchronization unit which can reduce a joining noise by utilizing the digital signal processing. CONSTITUTION:The output of clock sytem conveter circuit 13 is operated on sampling frequency K'Xf2 and is caused to pass through low-pass digital filter 17 of cut-off frequency f2/2, and the output sequence is taken out every K' times by switch 14. The sampling frequency of the input signal of complementary digital filter 12 is f1 Hz and is the Kth of operating frequency KXf1 Hz, and then, it is sufficient if the signal is inputted every K times. The output of circuit 13 has the side- band over f2/2 suppressed by filter 17, and the output which is data of sample rate K'Xf2 Hz is taken out every K' times by sample rate converting switch 14 which operates every f2 Hz, and data of sampling frequency f2 Hz is obtained at output terminal 15.
JP4250278A 1978-04-10 1978-04-10 Independent synchronization unit Granted JPS54134510A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4250278A JPS54134510A (en) 1978-04-10 1978-04-10 Independent synchronization unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4250278A JPS54134510A (en) 1978-04-10 1978-04-10 Independent synchronization unit

Publications (2)

Publication Number Publication Date
JPS54134510A true JPS54134510A (en) 1979-10-19
JPS6311819B2 JPS6311819B2 (en) 1988-03-16

Family

ID=12637832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4250278A Granted JPS54134510A (en) 1978-04-10 1978-04-10 Independent synchronization unit

Country Status (1)

Country Link
JP (1) JPS54134510A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52128010A (en) * 1976-04-20 1977-10-27 Fujitsu Ltd Synchronizing system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52128010A (en) * 1976-04-20 1977-10-27 Fujitsu Ltd Synchronizing system

Also Published As

Publication number Publication date
JPS6311819B2 (en) 1988-03-16

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