GB2095519B - Energy band discriminator - Google Patents

Energy band discriminator

Info

Publication number
GB2095519B
GB2095519B GB8206174A GB8206174A GB2095519B GB 2095519 B GB2095519 B GB 2095519B GB 8206174 A GB8206174 A GB 8206174A GB 8206174 A GB8206174 A GB 8206174A GB 2095519 B GB2095519 B GB 2095519B
Authority
GB
United Kingdom
Prior art keywords
energy band
band discriminator
discriminator
energy
band
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
GB8206174A
Other versions
GB2095519A (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.)
AT&T Corp
Original Assignee
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 US06/240,978 external-priority patent/US4426729A/en
Priority claimed from US06/240,979 external-priority patent/US4405840A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB2095519A publication Critical patent/GB2095519A/en
Application granted granted Critical
Publication of GB2095519B publication Critical patent/GB2095519B/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)
  • Filters That Use Time-Delay Elements (AREA)
GB8206174A 1981-03-05 1982-03-03 Energy band discriminator Expired GB2095519B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US06/240,978 US4426729A (en) 1981-03-05 1981-03-05 Partial band - whole band energy discriminator
US06/240,979 US4405840A (en) 1981-03-05 1981-03-05 Echo canceler far end energy discriminator

Publications (2)

Publication Number Publication Date
GB2095519A GB2095519A (en) 1982-09-29
GB2095519B true GB2095519B (en) 1985-05-22

Family

ID=26933878

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8206174A Expired GB2095519B (en) 1981-03-05 1982-03-03 Energy band discriminator

Country Status (6)

Country Link
DE (1) DE3235915T1 (en)
FR (1) FR2501439A1 (en)
GB (1) GB2095519B (en)
IT (1) IT1150253B (en)
NL (1) NL8220092A (en)
WO (1) WO1982003144A1 (en)

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 (en) * 1987-09-18 1989-03-22 Siemens Aktiengesellschaft Arrangement for detecting periodic signals for a speech echo canceller
WO1991018453A1 (en) * 1989-05-12 1991-11-28 Plessey Semiconductors 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 (en) * 1976-02-06 1983-09-21 日本電気株式会社 echo canceller
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
FR2501439B1 (en) 1984-12-21
WO1982003144A1 (en) 1982-09-16
IT8219972A0 (en) 1982-03-04
IT1150253B (en) 1986-12-10
GB2095519A (en) 1982-09-29
FR2501439A1 (en) 1982-09-10
DE3235915T1 (en) 1983-11-17
DE3235915C2 (en) 1987-06-19
NL8220092A (en) 1983-02-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee