CA1073136A - Attenuateur d'echo numerique pour systeme telephonique - Google Patents

Attenuateur d'echo numerique pour systeme telephonique

Info

Publication number: CA1073136A
Authority: CA; Canada
Prior art keywords: digital; output; signal; comparator; signals
Prior art date: 1977-11-21
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

CA291,341A

Other languages

English (en)

Inventor

Ernst A. Munter

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.)

Nortel Networks Ltd

Original Assignee

Northern Telecom Ltd

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.)

1977-11-21

Filing date

1977-11-21

Publication date

1980-03-04

1977-11-21 Application filed by Northern Telecom Ltd filed Critical Northern Telecom Ltd

1977-11-21 Priority to CA291,341A priority Critical patent/CA1073136A/fr

1980-03-04 Application granted granted Critical

1980-03-04 Publication of CA1073136A publication Critical patent/CA1073136A/fr

Status Expired legal-status Critical Current

Links

230000005540 biological transmission Effects 0.000 claims description 10
230000004044 response Effects 0.000 claims description 4
230000000694 effects Effects 0.000 abstract description 2
230000001629 suppression Effects 0.000 description 4
238000002592 echocardiography Methods 0.000 description 3
238000003780 insertion Methods 0.000 description 3
230000037431 insertion Effects 0.000 description 3
238000000034 method Methods 0.000 description 2
230000010355 oscillation Effects 0.000 description 2
230000000644 propagated effect Effects 0.000 description 2
230000002238 attenuated effect Effects 0.000 description 1
230000003190 augmentative effect Effects 0.000 description 1
230000003247 decreasing effect Effects 0.000 description 1
230000001934 delay Effects 0.000 description 1
238000001514 detection method Methods 0.000 description 1
238000010586 diagram Methods 0.000 description 1
230000006870 function Effects 0.000 description 1
230000000737 periodic effect Effects 0.000 description 1
230000002265 prevention Effects 0.000 description 1
238000004064 recycling Methods 0.000 description 1
230000002441 reversible effect Effects 0.000 description 1
238000005070 sampling Methods 0.000 description 1
230000001360 synchronised effect Effects 0.000 description 1
230000007704 transition Effects 0.000 description 1

Landscapes

Interface Circuits In Exchanges (AREA)

CA291,341A 1977-11-21 1977-11-21 Attenuateur d'echo numerique pour systeme telephonique Expired CA1073136A (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
CA291,341A CA1073136A (fr)	1977-11-21	1977-11-21	Attenuateur d'echo numerique pour systeme telephonique

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
CA291,341A CA1073136A (fr)	1977-11-21	1977-11-21	Attenuateur d'echo numerique pour systeme telephonique

Publications (1)

Publication Number	Publication Date
CA1073136A true CA1073136A (fr)	1980-03-04

Family

ID=4110085

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA291,341A Expired CA1073136A (fr)	1977-11-21	1977-11-21	Attenuateur d'echo numerique pour systeme telephonique

Country Status (1)

Country	Link
CA (1)	CA1073136A (fr)

1977
- 1977-11-21 CA CA291,341A patent/CA1073136A/fr not_active Expired

Similar Documents

Publication	Publication Date	Title
US4499578A (en)	1985-02-12	Method and apparatus for controlling signal level in a digital conference arrangement
EP0366584B1 (fr)	1994-12-07	Téléphone numérique avec haut-parleur entièrement duplex
US5313498A (en)	1994-05-17	Method and arrangement of echo elimination in digital telecommunications system
CA1288186C (fr)	1991-08-27	Dispositif de mise en mode mains libres pour telephone a commutation de gainet a suppression des echos
US3789165A (en)	1974-01-29	Echo canceller with variable threshold
US4029912A (en)	1977-06-14	Common control digital echo suppressor
JPS61127234A (ja)	1986-06-14	エコ−・キヤンセラの制御方式
US3958084A (en)	1976-05-18	Conferencing apparatus
US3896273A (en)	1975-07-22	Digital echo suppressor
JPS60260235A (ja)	1985-12-23	エコーキヤンセラ及びセンタクリツパ用制御装置
US4398287A (en)	1983-08-09	Digital switching over PAM bus system
US4555596A (en)	1985-11-26	Loudspeaking telephones
US4167653A (en)	1979-09-11	Adaptive speech signal detector
GB2253977A (en)	1992-09-23	Enhanced acoustic calibration procedure for a voice switched speakerphone
US4123626A (en)	1978-10-31	Digital echo attenuation circuit for a telephone system
US4165449A (en)	1979-08-21	Echo suppressor circuit
US4797876A (en)	1989-01-10	Conferencing bridge
US4012603A (en)	1977-03-15	Echo suppressor having self-adaptive means
US3947639A (en)	1976-03-30	Selective switching apparatus
US4126766A (en)	1978-11-21	3-Port conference circuit for use in private automatic branch exchange
US4213014A (en)	1980-07-15	Half echo-suppressor for a four-wire telephone line
CA1073136A (fr)	1980-03-04	Attenuateur d'echo numerique pour systeme telephonique
US3991287A (en)	1976-11-09	Digital echo suppressor noise insertion
US4192979A (en)	1980-03-11	Apparatus for controlling echo in communication systems utilizing a voice-activated switch
US3992594A (en)	1976-11-16	Echo suppressor break-in circuitry

Legal Events

Date	Code	Title	Description
1997-03-04	MKEX	Expiry