CA1144651A - Echo detector particularly for speech interpolation communication systems - Google Patents

Echo detector particularly for speech interpolation communication systems

Info

Publication number
CA1144651A
CA1144651A CA000347330A CA347330A CA1144651A CA 1144651 A CA1144651 A CA 1144651A CA 000347330 A CA000347330 A CA 000347330A CA 347330 A CA347330 A CA 347330A CA 1144651 A CA1144651 A CA 1144651A
Authority
CA
Canada
Prior art keywords
signal
echo
quotient
values
output
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
CA000347330A
Other languages
English (en)
French (fr)
Inventor
Joel Soumagne
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of CA1144651A publication Critical patent/CA1144651A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
    • H04B14/066—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM]
    • H04B14/068—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM] with adaptive feedback
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Analogue/Digital Conversion (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Time-Division Multiplex Systems (AREA)
CA000347330A 1979-03-12 1980-03-10 Echo detector particularly for speech interpolation communication systems Expired CA1144651A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7906671 1979-03-12
FR7906671A FR2451676A1 (fr) 1979-03-12 1979-03-12 Detecteur d'echo notamment pour systeme de communication a interpolation de parole

Publications (1)

Publication Number Publication Date
CA1144651A true CA1144651A (en) 1983-04-12

Family

ID=9223171

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000347330A Expired CA1144651A (en) 1979-03-12 1980-03-10 Echo detector particularly for speech interpolation communication systems

Country Status (6)

Country Link
US (1) US4360713A (OSRAM)
JP (1) JPS5660132A (OSRAM)
CA (1) CA1144651A (OSRAM)
DE (1) DE3009678A1 (OSRAM)
FR (1) FR2451676A1 (OSRAM)
GB (1) GB2050123B (OSRAM)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4897832A (en) * 1988-01-18 1990-01-30 Oki Electric Industry Co., Ltd. Digital speech interpolation system and speech detector
US7738408B2 (en) * 2004-01-09 2010-06-15 Realtek Semiconductor Corp. Transceiver for full duplex communication systems

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3896273A (en) * 1971-01-08 1975-07-22 Communications Satellite Corp Digital echo suppressor
US3784747A (en) * 1971-12-03 1974-01-08 Bell Telephone Labor Inc Speech suppression by predictive filtering
NL165014C (nl) * 1973-09-03 1981-02-16 Philips Nv Transmissiestelsel met een zender en een ontvanger voor het met behulp van een pulscode overdragen van informatiesignalen.
US3942116A (en) * 1975-03-13 1976-03-02 California Microwave, Inc. Transceiver having improved voice actuated carrier and echo suppression circuit
US4005276A (en) * 1975-03-20 1977-01-25 International Business Machines Corporation Digital voice signaling with digital echo detection and voice activity compression used to cancel echo
US4064379A (en) * 1976-06-11 1977-12-20 Communications Satellite Corporation Logarithmic echo canceller
US4123626A (en) * 1977-11-23 1978-10-31 Northern Telecom Limited Digital echo attenuation circuit for a telephone system

Also Published As

Publication number Publication date
US4360713A (en) 1982-11-23
DE3009678A1 (de) 1980-09-25
GB2050123A (en) 1980-12-31
FR2451676B1 (OSRAM) 1982-06-18
JPS5660132A (en) 1981-05-23
GB2050123B (en) 1983-11-02
FR2451676A1 (fr) 1980-10-10

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Legal Events

Date Code Title Description
MKEX Expiry