FR2501439A1 - Discriminateur de bande d'energie - Google Patents

Discriminateur de bande d'energie Download PDF

Info

Publication number
FR2501439A1
FR2501439A1 FR8203501A FR8203501A FR2501439A1 FR 2501439 A1 FR2501439 A1 FR 2501439A1 FR 8203501 A FR8203501 A FR 8203501A FR 8203501 A FR8203501 A FR 8203501A FR 2501439 A1 FR2501439 A1 FR 2501439A1
Authority
FR
France
Prior art keywords
signal
circuit
energy
filter
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.)
Granted
Application number
FR8203501A
Other languages
English (en)
French (fr)
Other versions
FR2501439B1 (enExample
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 Inc
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 FR2501439A1 publication Critical patent/FR2501439A1/fr
Application granted granted Critical
Publication of FR2501439B1 publication Critical patent/FR2501439B1/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
    • 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)
FR8203501A 1981-03-05 1982-03-03 Discriminateur de bande d'energie Granted FR2501439A1 (fr)

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
FR2501439A1 true FR2501439A1 (fr) 1982-09-10
FR2501439B1 FR2501439B1 (enExample) 1984-12-21

Family

ID=26933878

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8203501A Granted FR2501439A1 (fr) 1981-03-05 1982-03-03 Discriminateur de bande d'energie

Country Status (6)

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

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
ATE115794T1 (de) * 1989-05-12 1994-12-15 Plessey Semiconductors Ltd Schaltung zur audiosignalverarbeitung.
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937899A (en) * 1975-01-30 1976-02-10 Bell Telephone Laboratories, Incorporated Tone detector using spectrum parameter estimation
US4028496A (en) * 1976-08-17 1977-06-07 Bell Telephone Laboratories, Incorporated Digital speech detector
JPS5295912A (en) * 1976-02-06 1977-08-12 Nec Corp Echo cancelling device
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
EP0021317A2 (en) * 1979-06-21 1981-01-07 Western Electric Company, Incorporated Adaptive filter with TAP coefficient leakage
US4277645A (en) * 1980-01-25 1981-07-07 Bell Telephone Laboratories, Incorporated Multiple variable threshold speech detector

Family Cites Families (1)

* 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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937899A (en) * 1975-01-30 1976-02-10 Bell Telephone Laboratories, Incorporated Tone detector using spectrum parameter estimation
JPS5295912A (en) * 1976-02-06 1977-08-12 Nec Corp Echo cancelling device
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
EP0021317A2 (en) * 1979-06-21 1981-01-07 Western Electric Company, Incorporated Adaptive filter with TAP coefficient leakage
US4277645A (en) * 1980-01-25 1981-07-07 Bell Telephone Laboratories, Incorporated Multiple variable threshold speech detector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 1, no. 153, 8 dècembre 1977, page 8180 E 77; & JP - A - 52 95 912 (NIPPON DENKI K.K.) (08-12-1977) *

Also Published As

Publication number Publication date
IT1150253B (it) 1986-12-10
GB2095519A (en) 1982-09-29
IT8219972A0 (it) 1982-03-04
FR2501439B1 (enExample) 1984-12-21
WO1982003144A1 (en) 1982-09-16
DE3235915T1 (de) 1983-11-17
NL8220092A (nl) 1983-02-01
GB2095519B (en) 1985-05-22
DE3235915C2 (enExample) 1987-06-19

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