IT1007418B - Metodo ed apparecchiatura per la soppressione del rumore di fondo in un sistema telefonico digitale - Google Patents

Metodo ed apparecchiatura per la soppressione del rumore di fondo in un sistema telefonico digitale

Info

Publication number
IT1007418B
IT1007418B IT20570/74A IT2057074A IT1007418B IT 1007418 B IT1007418 B IT 1007418B IT 20570/74 A IT20570/74 A IT 20570/74A IT 2057074 A IT2057074 A IT 2057074A IT 1007418 B IT1007418 B IT 1007418B
Authority
IT
Italy
Prior art keywords
equipment
background noise
telephone system
noise suppression
digital telephone
Prior art date
Application number
IT20570/74A
Other languages
English (en)
Italian (it)
Inventor
P Smith
Original Assignee
Ericsson L M Pty 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.)
Filing date
Publication date
Application filed by Ericsson L M Pty Ltd filed Critical Ericsson L M Pty Ltd
Application granted granted Critical
Publication of IT1007418B publication Critical patent/IT1007418B/it

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/02—Delta modulation, i.e. one-bit differential modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/02—Delta modulation, i.e. one-bit differential modulation
    • H03M3/022—Delta modulation, i.e. one-bit differential modulation with adaptable step size, e.g. adaptive delta modulation [ADM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/253—Telephone sets using digital voice transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Analogue/Digital Conversion (AREA)
IT20570/74A 1973-03-21 1974-04-08 Metodo ed apparecchiatura per la soppressione del rumore di fondo in un sistema telefonico digitale IT1007418B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB268773 1973-03-21

Publications (1)

Publication Number Publication Date
IT1007418B true IT1007418B (it) 1976-10-30

Family

ID=3765655

Family Applications (1)

Application Number Title Priority Date Filing Date
IT20570/74A IT1007418B (it) 1973-03-21 1974-04-08 Metodo ed apparecchiatura per la soppressione del rumore di fondo in un sistema telefonico digitale

Country Status (14)

Country Link
US (1) US3995217A (en, 2012)
JP (1) JPS5027418A (en, 2012)
BE (1) BE812634A (en, 2012)
BR (1) BR7402222D0 (en, 2012)
CA (1) CA1064172A (en, 2012)
DE (1) DE2413679A1 (en, 2012)
DK (1) DK146330C (en, 2012)
ES (1) ES424492A1 (en, 2012)
FR (1) FR2222806B1 (en, 2012)
GB (1) GB1427459A (en, 2012)
HU (1) HU170812B (en, 2012)
IT (1) IT1007418B (en, 2012)
NL (1) NL7403838A (en, 2012)
SE (1) SE399159B (en, 2012)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190801A (en) * 1978-02-06 1980-02-26 Deltalab Research, Inc. Digital encoding circuitry
CN103344849B (zh) * 2013-05-31 2015-05-27 哈尔滨工业大学 一种获取随机解调硬件系统的感知矩阵的方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL277910A (en, 2012) * 1961-05-02
US3500441A (en) * 1967-10-12 1970-03-10 Bell Telephone Labor Inc Delta modulation with discrete companding
US3609551A (en) * 1968-06-28 1971-09-28 Bell Telephone Labor Inc Discrete-continuous companding for a digital transmission system
US3582784A (en) * 1968-10-18 1971-06-01 Bell Telephone Labor Inc Delta modulation system
FR2098466A5 (en, 2012) * 1969-10-16 1972-03-10 Ibm France
FR2082740A5 (en, 2012) * 1970-03-25 1971-12-10 Trt Telecom Radio Electr
US3729678A (en) * 1971-07-20 1973-04-24 Philips Corp Pcm system including a pulse pattern analyzer

Also Published As

Publication number Publication date
ES424492A1 (es) 1976-06-01
DK146330C (da) 1984-03-26
US3995217A (en) 1976-11-30
HU170812B (hu) 1977-09-28
BE812634A (fr) 1974-07-15
GB1427459A (en) 1976-03-10
SE399159B (sv) 1978-01-30
DK146330B (da) 1983-09-05
FR2222806A1 (en, 2012) 1974-10-18
CA1064172A (en) 1979-10-09
JPS5027418A (en, 2012) 1975-03-20
DE2413679A1 (de) 1974-10-10
FR2222806B1 (en, 2012) 1977-10-07
BR7402222D0 (pt) 1974-12-03
NL7403838A (en, 2012) 1974-09-24

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