SE7613872L - Sett astadkommande av en i steg instellbar endring av signalnivaer samt krets for settets genomforande - Google Patents

Sett astadkommande av en i steg instellbar endring av signalnivaer samt krets for settets genomforande

Info

Publication number
SE7613872L
SE7613872L SE7613872A SE7613872A SE7613872L SE 7613872 L SE7613872 L SE 7613872L SE 7613872 A SE7613872 A SE 7613872A SE 7613872 A SE7613872 A SE 7613872A SE 7613872 L SE7613872 L SE 7613872L
Authority
SE
Sweden
Prior art keywords
installable
implementation
circuit
change
signal levels
Prior art date
Application number
SE7613872A
Other languages
English (en)
Other versions
SE414257B (sv
Inventor
E A Munter
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 SE7613872L publication Critical patent/SE7613872L/sv
Publication of SE414257B publication Critical patent/SE414257B/sv

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)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Analogue/Digital Conversion (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
SE7613872A 1975-12-11 1976-12-09 Sett for astadkommande av en i steg instellbar endring av signalnivaer samt krets for settets genomforande SE414257B (sv)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA241,572A CA1021879A (en) 1975-12-11 1975-12-11 Incrementally adjustable digital attenuator/amplifier

Publications (2)

Publication Number Publication Date
SE7613872L true SE7613872L (sv) 1977-06-12
SE414257B SE414257B (sv) 1980-07-14

Family

ID=4104728

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7613872A SE414257B (sv) 1975-12-11 1976-12-09 Sett for astadkommande av en i steg instellbar endring av signalnivaer samt krets for settets genomforande

Country Status (8)

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

Families Citing this family (8)

* 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
US4454498A (en) * 1979-05-21 1984-06-12 Siemens Aktiengesellschaft Adjustable attenuation member for a digital telecommunications system
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
FR2615336A1 (fr) * 1987-05-12 1988-11-18 Thomson Csf Attenuateur pour signal numerique et modulateur utilisant un tel attenuateur
US6381266B1 (en) * 1998-09-30 2002-04-30 Conexant Systems, Inc. Method and apparatus for identifying the encoding type of a central office codec

Family Cites Families (3)

* 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
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

Also Published As

Publication number Publication date
FR2335101A1 (fr) 1977-07-08
CA1021879A (en) 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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