GB1509988A - Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller - Google Patents

Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller

Info

Publication number
GB1509988A
GB1509988A GB44083/76A GB4408376A GB1509988A GB 1509988 A GB1509988 A GB 1509988A GB 44083/76 A GB44083/76 A GB 44083/76A GB 4408376 A GB4408376 A GB 4408376A GB 1509988 A GB1509988 A GB 1509988A
Authority
GB
United Kingdom
Prior art keywords
register
impulse response
value
samples
cleared
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.)
Expired
Application number
GB44083/76A
Other languages
English (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.)
Comsat Corp
Original Assignee
Comsat 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 Comsat Corp filed Critical Comsat Corp
Publication of GB1509988A publication Critical patent/GB1509988A/en
Expired 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
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB44083/76A 1975-10-23 1976-10-22 Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller Expired GB1509988A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/625,354 US4021623A (en) 1975-10-23 1975-10-23 Automatic H-register clear for prevention of erroneous convolution in digital adaptive echo canceller

Publications (1)

Publication Number Publication Date
GB1509988A true GB1509988A (en) 1978-05-10

Family

ID=24505681

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44083/76A Expired GB1509988A (en) 1975-10-23 1976-10-22 Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller

Country Status (10)

Country Link
US (1) US4021623A (https=)
JP (2) JPS5252516A (https=)
AU (1) AU498405B2 (https=)
BR (1) BR7607021A (https=)
CA (1) CA1065514A (https=)
DE (1) DE2647305A1 (https=)
FR (1) FR2333388A1 (https=)
GB (1) GB1509988A (https=)
IT (1) IT1070494B (https=)
SE (1) SE406401B (https=)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56153850A (en) * 1980-04-28 1981-11-28 Kokusai Denshin Denwa Co Ltd <Kdd> Echo control system
US4412299A (en) * 1981-02-02 1983-10-25 Teltone Corporation Phase jitter detector
DE3245588A1 (de) * 1982-12-09 1984-06-14 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren und schaltungsanordnung zur fehlerortung bei einem digitalen fernmelde-teilnehmeranschluss
JP3068996B2 (ja) * 1993-12-21 2000-07-24 真作 森 適応フィルタ装置及びそのステップゲインの発生方法
JPH08265224A (ja) * 1995-03-22 1996-10-11 Nec Corp エコーキャンセラ
US6125179A (en) * 1995-12-13 2000-09-26 3Com Corporation Echo control device with quick response to sudden echo-path change
US10679227B2 (en) * 2015-11-06 2020-06-09 Mastercard International Incorporated Systems and methods for mapping online data to data of interest

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836734A (en) * 1971-12-03 1974-09-17 Communications Satellite Corp Adaptive echo canceller with multi-increment gain coefficient corrections
US3789165A (en) * 1972-04-24 1974-01-29 Communications Satellite Corp Echo canceller with variable threshold
US3894200A (en) * 1973-10-10 1975-07-08 Communications Satellite Corp Adaptive echo canceller with digital center clipping

Also Published As

Publication number Publication date
JPS5252516A (en) 1977-04-27
US4021623A (en) 1977-05-03
JPS59131232A (ja) 1984-07-28
AU1864376A (en) 1978-04-20
AU498405B2 (en) 1979-03-08
SE7611711L (sv) 1977-04-24
BR7607021A (pt) 1977-09-06
FR2333388B1 (https=) 1981-08-07
SE406401B (sv) 1979-02-05
JPS602810B2 (ja) 1985-01-24
FR2333388A1 (fr) 1977-06-24
IT1070494B (it) 1985-03-29
DE2647305A1 (de) 1977-04-28
CA1065514A (en) 1979-10-30

Similar Documents

Publication Publication Date Title
GB1563743A (en) Pseudo rms value circuits for use in logarithmic echo cancellers
ES8106383A1 (es) Un recortador para disminuir la cadencia de palabra de una senal digital del tipo utilizado en sistemas telefonicos digitales
GB1509988A (en) Automatic h-register clear for prevention of erroneous convolution in digital adaptive echo canceller
EG13217A (en) Recursive like adaptive echo canceller
JPS56153850A (en) Echo control system
JPS5711527A (en) Chattering prevention circuit for electronic wrist watch
EP0351843A3 (en) Digital adaptive filter and method of convergence therein
JPS524105A (en) Frequency synthesizer-method transmitter-receiver
JPS5245980A (en) Digital electronic watch
IE781170L (en) Frequency detection
JPS5361903A (en) Unnecessary signal sound suppressor for telephone set
EP0177239A3 (en) Adaptive filter including signal path compensation
JPS5563144A (en) Signal detecting system for calling receiver
JPS55123243A (en) Echo canceler
JPS5723354A (en) Display and transmission equipment of telephone number
JPS56136026A (en) Glitch preventing circuit of digital-to-analog converter
JPS57129563A (en) Call signal detector
JPS6412648A (en) Echo canceller
JPS5255516A (en) Indicating device
JPS5261743A (en) Protective relay equipment
JPS5466064A (en) Constant-difference modulator
JPS53124023A (en) Noise deletion circuit
SHEVTSOV et al. Analysis of the operation of coincidence circuits(error probability determination)
JPS54138975A (en) Position pulse correcting circuit
JPS5315051A (en) Chattering absorbing circuit of contacts

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee