FR2234707A1 - Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator - Google Patents

Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator

Info

Publication number
FR2234707A1
FR2234707A1 FR7322425A FR7322425A FR2234707A1 FR 2234707 A1 FR2234707 A1 FR 2234707A1 FR 7322425 A FR7322425 A FR 7322425A FR 7322425 A FR7322425 A FR 7322425A FR 2234707 A1 FR2234707 A1 FR 2234707A1
Authority
FR
France
Prior art keywords
signal
bits
converted
low
amplitude
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.)
Granted
Application number
FR7322425A
Other languages
French (fr)
Other versions
FR2234707B1 (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.)
ECOLE NALE RADIOTECH ELECT APP
Original Assignee
ECOLE NALE RADIOTECH ELECT APP
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 ECOLE NALE RADIOTECH ELECT APP filed Critical ECOLE NALE RADIOTECH ELECT APP
Priority to FR7322425A priority Critical patent/FR2234707A1/en
Publication of FR2234707A1 publication Critical patent/FR2234707A1/en
Application granted granted Critical
Publication of FR2234707B1 publication Critical patent/FR2234707B1/fr
Granted 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
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Dc Digital Transmission (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The low-noise digital telecommunications system converts amplitude of the analog information signals into a digital code for transmission. At the transmitter, clock pulses are counted and the sum converted into an analog signal whose amplitude is then compared with the information signal's amplitude sample. When the converted signal's amplitude is signal to the information signal's, the coupling process is stopped and the contents transmitted as the digital code. At the receiver, the n-bits of transmitted information are converted into p-bits (p>n): The sequence of levels chosen for the p-bits is such that the distance between two consecutive level is least. The p-bits are then converted into an analog output signal.
FR7322425A 1973-06-20 1973-06-20 Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator Granted FR2234707A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7322425A FR2234707A1 (en) 1973-06-20 1973-06-20 Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7322425A FR2234707A1 (en) 1973-06-20 1973-06-20 Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator

Publications (2)

Publication Number Publication Date
FR2234707A1 true FR2234707A1 (en) 1975-01-17
FR2234707B1 FR2234707B1 (en) 1976-09-17

Family

ID=9121233

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7322425A Granted FR2234707A1 (en) 1973-06-20 1973-06-20 Low-noise digital communication system - converts amplitudes into digital signals using clock pulse counter and comparator

Country Status (1)

Country Link
FR (1) FR2234707A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1299859A (en) * 1969-03-24 1972-12-13 Nippon Electric Co Improvements in or relating to companding encoders and decoders

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1299859A (en) * 1969-03-24 1972-12-13 Nippon Electric Co Improvements in or relating to companding encoders and decoders

Also Published As

Publication number Publication date
FR2234707B1 (en) 1976-09-17

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Legal Events

Date Code Title Description
ST Notification of lapse