FR2246131A1 - Digital multiplex echo suppression system - has two storage devices at transmission and reception sides - Google Patents

Digital multiplex echo suppression system - has two storage devices at transmission and reception sides

Info

Publication number
FR2246131A1
FR2246131A1 FR7428429A FR7428429A FR2246131A1 FR 2246131 A1 FR2246131 A1 FR 2246131A1 FR 7428429 A FR7428429 A FR 7428429A FR 7428429 A FR7428429 A FR 7428429A FR 2246131 A1 FR2246131 A1 FR 2246131A1
Authority
FR
France
Prior art keywords
time interval
transmission
storage devices
specified time
during
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
FR7428429A
Other languages
French (fr)
Other versions
FR2246131B1 (en
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.)
Nippon Telegraph and Telephone Corp
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
Publication of FR2246131A1 publication Critical patent/FR2246131A1/en
Application granted granted Critical
Publication of FR2246131B1 publication Critical patent/FR2246131B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

Two accumulative devices add absolute values of a.f. signals in an information signal digitally coded, multiplex processed, during a specified time interval for each channel, and store it during a specified time interval; it comprises further a device comparing the content of one storage device with the other; a clock pulse generator delivering an output signal during a specified time interval in accordance with the comparator output; and logic circuits for the above a.f. signals control, so that the echoes in a number of channels are consecutively suppressed by the control signals in a certain sequence in time.
FR7428429A 1973-08-20 1974-08-19 Digital multiplex echo suppression system - has two storage devices at transmission and reception sides Granted FR2246131A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9237173A JPS5317451B2 (en) 1973-08-20 1973-08-20

Publications (2)

Publication Number Publication Date
FR2246131A1 true FR2246131A1 (en) 1975-04-25
FR2246131B1 FR2246131B1 (en) 1980-03-21

Family

ID=14052550

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7428429A Granted FR2246131A1 (en) 1973-08-20 1974-08-19 Digital multiplex echo suppression system - has two storage devices at transmission and reception sides

Country Status (4)

Country Link
JP (1) JPS5317451B2 (en)
CA (1) CA1056522A (en)
DE (1) DE2439655A1 (en)
FR (1) FR2246131A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5545761Y2 (en) * 1976-07-29 1980-10-27
JPS5828971B2 (en) * 1977-12-20 1983-06-20 日本電気株式会社 Multiplexed digital echo rejection device
JPS54179843U (en) * 1978-06-05 1979-12-19
JPS5554901A (en) * 1978-10-20 1980-04-22 Hidetoshi Tanaka Production of shoe insole

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499999A (en) * 1966-10-31 1970-03-10 Bell Telephone Labor Inc Closed loop adaptive echo canceller using generalized filter networks
US3562448A (en) * 1968-06-21 1971-02-09 Bell Telephone Labor Inc Common control digital echo suppression
US3632905A (en) * 1969-12-19 1972-01-04 Bell Telephone Labor Inc Method for improving the settling time of a transversal filter adaptive echo canceller

Also Published As

Publication number Publication date
DE2439655A1 (en) 1975-03-27
JPS5317451B2 (en) 1978-06-08
CA1056522A (en) 1979-06-12
FR2246131B1 (en) 1980-03-21
JPS5042717A (en) 1975-04-18

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Legal Events

Date Code Title Description
TP Transmission of property