GB1287171A - Improvements in digital transmission of telephony signals - Google Patents

Improvements in digital transmission of telephony signals

Info

Publication number
GB1287171A
GB1287171A GB4164570A GB4164570A GB1287171A GB 1287171 A GB1287171 A GB 1287171A GB 4164570 A GB4164570 A GB 4164570A GB 4164570 A GB4164570 A GB 4164570A GB 1287171 A GB1287171 A GB 1287171A
Authority
GB
United Kingdom
Prior art keywords
counter
attenuation
maximum
cause
quantizer
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
GB4164570A
Other languages
English (en)
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1287171A publication Critical patent/GB1287171A/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
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth
    • H04B14/048—Non linear compression or expansion
    • 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
    • H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046—Systems or methods for reducing noise or bandwidth

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
GB4164570A 1969-08-29 1970-08-28 Improvements in digital transmission of telephony signals Expired GB1287171A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6929592A FR2056081A5 (https=) 1969-08-29 1969-08-29

Publications (1)

Publication Number Publication Date
GB1287171A true GB1287171A (en) 1972-08-31

Family

ID=9039537

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4164570A Expired GB1287171A (en) 1969-08-29 1970-08-28 Improvements in digital transmission of telephony signals

Country Status (6)

Country Link
BE (1) BE754708A (https=)
CH (1) CH526887A (https=)
DE (1) DE2042470A1 (https=)
FR (1) FR2056081A5 (https=)
GB (1) GB1287171A (https=)
NL (1) NL7012511A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160394A (en) * 1984-05-02 1985-12-18 Pioneer Electronic Corp Noise reduction system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL190093C (nl) * 1979-12-17 1993-10-18 Victor Company Of Japan Comprimeer- en expandeerstelsel.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE489677A (https=) * 1948-06-19
US3026375A (en) * 1958-05-09 1962-03-20 Bell Telephone Labor Inc Transmission of quantized signals
US3187323A (en) * 1961-10-24 1965-06-01 North American Aviation Inc Automatic scaler for analog-to-digital converter
FR89055E (fr) * 1963-01-25 1967-05-05 Int Standard Electric Corp Transmission des valeurs numériques en code digital

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160394A (en) * 1984-05-02 1985-12-18 Pioneer Electronic Corp Noise reduction system

Also Published As

Publication number Publication date
DE2042470A1 (de) 1971-03-18
BE754708A (fr) 1971-01-18
CH526887A (fr) 1972-08-15
NL7012511A (https=) 1971-03-02
FR2056081A5 (https=) 1971-05-14

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees