JPS562751A - Digital echo suppressor - Google Patents

Digital echo suppressor

Info

Publication number
JPS562751A
JPS562751A JP7756279A JP7756279A JPS562751A JP S562751 A JPS562751 A JP S562751A JP 7756279 A JP7756279 A JP 7756279A JP 7756279 A JP7756279 A JP 7756279A JP S562751 A JPS562751 A JP S562751A
Authority
JP
Japan
Prior art keywords
level
noise
output
generator
echo switch
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.)
Pending
Application number
JP7756279A
Other languages
Japanese (ja)
Inventor
Yotaro Hachitsuka
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP7756279A priority Critical patent/JPS562751A/en
Publication of JPS562751A publication Critical patent/JPS562751A/en
Pending 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To dissolve unnaturalness of talking, by outputting level-controlled digital false noise during the opening time of an echo switch and by adding the output of a noise generator to the output of the echo switch. CONSTITUTION:Noise generator has false noise generator 18 which generates digital false noise, and noise level setting equipment 17 which determines the level of digital false sound according to outputs of sound detectors 8 and 9 which detect the level of the digital transmission signal for every fixed section. Generator 14 outputs level-controlled digital false noise during the opening time of echo switch 1, and the output of generator 14 is added to the output of echo switch 1 by echo switch 1 and adder 15 inserted into the output terminal. As a result, unnaturalness of talking can be dissolved.
JP7756279A 1979-06-21 1979-06-21 Digital echo suppressor Pending JPS562751A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7756279A JPS562751A (en) 1979-06-21 1979-06-21 Digital echo suppressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7756279A JPS562751A (en) 1979-06-21 1979-06-21 Digital echo suppressor

Publications (1)

Publication Number Publication Date
JPS562751A true JPS562751A (en) 1981-01-13

Family

ID=13637447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7756279A Pending JPS562751A (en) 1979-06-21 1979-06-21 Digital echo suppressor

Country Status (1)

Country Link
JP (1) JPS562751A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10520309B2 (en) 2015-07-02 2019-12-31 Ricoh Company, Ltd. Object recognition device, object recognition method, equipment control system, and distance image generation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10520309B2 (en) 2015-07-02 2019-12-31 Ricoh Company, Ltd. Object recognition device, object recognition method, equipment control system, and distance image generation device

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