FR2335101A1 - Attenuateur/amplificateur numerique reglable par increments - Google Patents

Attenuateur/amplificateur numerique reglable par increments

Info

Publication number
FR2335101A1
FR2335101A1 FR7637010A FR7637010A FR2335101A1 FR 2335101 A1 FR2335101 A1 FR 2335101A1 FR 7637010 A FR7637010 A FR 7637010A FR 7637010 A FR7637010 A FR 7637010A FR 2335101 A1 FR2335101 A1 FR 2335101A1
Authority
FR
France
Prior art keywords
increments
digital attenuator
amplifier adjustable
amplifier
adjustable
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.)
Withdrawn
Application number
FR7637010A
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom 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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of FR2335101A1 publication Critical patent/FR2335101A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/0054—Attenuators
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/002—Control of digital or coded signals
    • 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
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/10—Logarithmic or exponential functions
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2101/00—Indexing scheme relating to the type of digital function generated
    • G06F2101/16—PCM companding functions

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Signal Processing (AREA)
  • Analogue/Digital Conversion (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
FR7637010A 1975-12-11 1976-12-08 Attenuateur/amplificateur numerique reglable par increments Withdrawn FR2335101A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA241,572A CA1021879A (fr) 1975-12-11 1975-12-11 Attenuateur/amplificateur numerique reglable par tranche

Publications (1)

Publication Number Publication Date
FR2335101A1 true FR2335101A1 (fr) 1977-07-08

Family

ID=4104728

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7637010A Withdrawn FR2335101A1 (fr) 1975-12-11 1976-12-08 Attenuateur/amplificateur numerique reglable par increments

Country Status (8)

Country Link
US (1) US4021652A (fr)
JP (1) JPS5272149A (fr)
CA (1) CA1021879A (fr)
DE (1) DE2656133A1 (fr)
FR (1) FR2335101A1 (fr)
GB (1) GB1543830A (fr)
NL (1) NL7613479A (fr)
SE (1) SE414257B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019261A1 (fr) * 1979-05-21 1980-11-26 Siemens Aktiengesellschaft Atténuateur ajustable pour un central de télécommunication digital, notamment un central téléphonique
FR2615336A1 (fr) * 1987-05-12 1988-11-18 Thomson Csf Attenuateur pour signal numerique et modulateur utilisant un tel attenuateur

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445671A1 (fr) * 1978-12-28 1980-07-25 Maitre Xavier Systeme de transmission, par l'intermediaire d'un canal numerique, de signaux telephoniques multiplexes par repartition en frequence
US4367456A (en) * 1979-03-09 1983-01-04 Northern Telecom Limited PCM and PAM Conversion circuit including signal level variation on the PCM portion of the circuit
US4470125A (en) * 1981-11-09 1984-09-04 Rca Corporation Multiplier for digital video signals using a cascade of signal-selectable memories
US4447826A (en) * 1982-03-18 1984-05-08 Rca Corporation Digital television receiver automatic chroma control system
US4604723A (en) * 1983-10-17 1986-08-05 Sanders Associates, Inc. Bit-slice adder circuit
US6381266B1 (en) * 1998-09-30 2002-04-30 Conexant Systems, Inc. Method and apparatus for identifying the encoding type of a central office codec

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662347A (en) * 1970-03-11 1972-05-09 North American Rockwell Signal compression and expansion system using a memory

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688097A (en) * 1970-05-20 1972-08-29 Bell Telephone Labor Inc Digital attenuator for non-linear pulse code modulation signals
BE792988A (fr) * 1971-12-22 1973-04-16 Western Electric Co Dispositif numerique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662347A (en) * 1970-03-11 1972-05-09 North American Rockwell Signal compression and expansion system using a memory

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019261A1 (fr) * 1979-05-21 1980-11-26 Siemens Aktiengesellschaft Atténuateur ajustable pour un central de télécommunication digital, notamment un central téléphonique
FR2615336A1 (fr) * 1987-05-12 1988-11-18 Thomson Csf Attenuateur pour signal numerique et modulateur utilisant un tel attenuateur

Also Published As

Publication number Publication date
SE7613872L (sv) 1977-06-12
CA1021879A (fr) 1977-11-29
DE2656133A1 (de) 1977-06-23
SE414257B (sv) 1980-07-14
NL7613479A (nl) 1977-06-14
JPS5272149A (en) 1977-06-16
GB1543830A (en) 1979-04-11
US4021652A (en) 1977-05-03

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Legal Events

Date Code Title Description
ST Notification of lapse