DE3235915C2 - - Google Patents

Info

Publication number
DE3235915C2
DE3235915C2 DE3235915T DE3235915T DE3235915C2 DE 3235915 C2 DE3235915 C2 DE 3235915C2 DE 3235915 T DE3235915 T DE 3235915T DE 3235915 T DE3235915 T DE 3235915T DE 3235915 C2 DE3235915 C2 DE 3235915C2
Authority
DE
Germany
Prior art keywords
signal
energy
filter
adapt
energy discriminator
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
DE3235915T
Other languages
German (de)
English (en)
Other versions
DE3235915T1 (de
Inventor
Charles William Kevin Gritton
Timothy James Zebo
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.)
AT&T Corp
Original Assignee
AT&T Technologies Inc
Western Electric Co Inc
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
Priority claimed from US06/240,979 external-priority patent/US4405840A/en
Priority claimed from US06/240,978 external-priority patent/US4426729A/en
Application filed by AT&T Technologies Inc, Western Electric Co Inc filed Critical AT&T Technologies Inc
Publication of DE3235915T1 publication Critical patent/DE3235915T1/de
Application granted granted Critical
Publication of DE3235915C2 publication Critical patent/DE3235915C2/de
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
    • 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)
  • Filters That Use Time-Delay Elements (AREA)
DE823235915T 1981-03-05 1982-02-24 Energiebanddiskriminator Granted DE3235915T1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US06/240,979 US4405840A (en) 1981-03-05 1981-03-05 Echo canceler far end energy discriminator
US06/240,978 US4426729A (en) 1981-03-05 1981-03-05 Partial band - whole band energy discriminator
PCT/US1982/000228 WO1982003144A1 (en) 1981-03-05 1982-02-24 Energy band discriminator

Publications (2)

Publication Number Publication Date
DE3235915T1 DE3235915T1 (de) 1983-11-17
DE3235915C2 true DE3235915C2 (US20020095090A1-20020718-M00002.png) 1987-06-19

Family

ID=26933878

Family Applications (1)

Application Number Title Priority Date Filing Date
DE823235915T Granted DE3235915T1 (de) 1981-03-05 1982-02-24 Energiebanddiskriminator

Country Status (6)

Country Link
DE (1) DE3235915T1 (US20020095090A1-20020718-M00002.png)
FR (1) FR2501439A1 (US20020095090A1-20020718-M00002.png)
GB (1) GB2095519B (US20020095090A1-20020718-M00002.png)
IT (1) IT1150253B (US20020095090A1-20020718-M00002.png)
NL (1) NL8220092A (US20020095090A1-20020718-M00002.png)
WO (1) WO1982003144A1 (US20020095090A1-20020718-M00002.png)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468641A (en) * 1982-06-28 1984-08-28 At&T Bell Laboratories Adaptive filter update normalization
US4467441A (en) * 1982-10-08 1984-08-21 At&T Bell Laboratories Adaptive filter including controlled tap coefficient leakage
US4707824A (en) * 1983-12-15 1987-11-17 Nec Corporation Method and apparatus for cancelling echo
EP0307765A1 (de) * 1987-09-18 1989-03-22 Siemens Aktiengesellschaft Anordnung zum Erkennen periodischer Signale für einen Sprach-Echokompensator
US5453976A (en) * 1989-05-12 1995-09-26 Gpt Limited Audio signal processor circuit
GB2256351B (en) * 1991-05-25 1995-07-05 Motorola Inc Enhancement of echo return loss
US5592548A (en) * 1995-05-31 1997-01-07 Qualcomm Incorporated System and method for avoiding false convergence in the presence of tones in a time-domain echo cancellation process

Family Cites Families (8)

* 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
US3937899A (en) * 1975-01-30 1976-02-10 Bell Telephone Laboratories, Incorporated Tone detector using spectrum parameter estimation
JPS5842663B2 (ja) * 1976-02-06 1983-09-21 日本電気株式会社 反響消去装置
US4028496A (en) * 1976-08-17 1977-06-07 Bell Telephone Laboratories, Incorporated Digital speech detector
US4072830A (en) * 1976-10-04 1978-02-07 Bell Telephone Laboratories, Incorporated Variable phase shifter for adaptive echo cancellers
US4129753A (en) * 1977-12-09 1978-12-12 Bell Telephone Laboratories, Incorporated Echo canceller using feedback to improve speech detector performance
US4243959A (en) * 1979-06-21 1981-01-06 Bell Telephone Laboratories, Incorporated Adaptive filter with tap coefficient leakage
US4277645A (en) * 1980-01-25 1981-07-07 Bell Telephone Laboratories, Incorporated Multiple variable threshold speech detector

Also Published As

Publication number Publication date
IT1150253B (it) 1986-12-10
GB2095519B (en) 1985-05-22
IT8219972A0 (it) 1982-03-04
DE3235915T1 (de) 1983-11-17
WO1982003144A1 (en) 1982-09-16
FR2501439B1 (US20020095090A1-20020718-M00002.png) 1984-12-21
NL8220092A (nl) 1983-02-01
FR2501439A1 (fr) 1982-09-10
GB2095519A (en) 1982-09-29

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