SE8001498L - converter - Google Patents

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Info

Publication number
SE8001498L
SE8001498L SE8001498A SE8001498A SE8001498L SE 8001498 L SE8001498 L SE 8001498L SE 8001498 A SE8001498 A SE 8001498A SE 8001498 A SE8001498 A SE 8001498A SE 8001498 L SE8001498 L SE 8001498L
Authority
SE
Sweden
Prior art keywords
signals
line
pam
conversion circuit
digital
Prior art date
Application number
SE8001498A
Other languages
Swedish (sv)
Other versions
SE439713B (en
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 SE8001498L publication Critical patent/SE8001498L/en
Publication of SE439713B publication Critical patent/SE439713B/en

Links

Classifications

    • 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
    • H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
    • H03M1/129—Means for adapting the input signal to the range the converter can handle, e.g. limiting, pre-scaling ; Out-of-range indication
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K11/00—Transforming types of modulations, e.g. position-modulated pulses into duration-modulated pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • 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
    • 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
    • H03M1/38—Analogue value compared with reference values sequentially only, e.g. successive approximation type
    • H03M1/46—Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Analogue/Digital Conversion (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A conversion circuit 20 for use with digital telephone switching equipment for converting pulse amplitude modulation (PAM) signals on line 19 into pulse code modulated (PCM) signals on line 31 and for converting PCM signals on line 30 into PAM signals on line 18. When these conversions are done it is desirable to adjust the magnitude of the signals involved to take into account the differing losses in the associated analogue circuitry. The present invention employs digital pads 25, 42, in the digital portion of the conversion circuit and controlled by a storage register 26, in order to introduce variations in the signal levels. <IMAGE>
SE8001498A 1979-02-27 1980-02-26 THE CONVERSION CIRCUIT TO A DIGITAL PHONE CONNECTOR FOR THE CONVERSION OF THE PULSE AMPLIFIED MODULATED SIGNALS TO THE PULSE CODE MODULATED SIGNALS AND VICE VERSA SE439713B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA000322373A CA1152650A (en) 1979-02-27 1979-02-27 Pcm and pam conversion circuit including signal level variation on the pcm portion of the circuit

Publications (2)

Publication Number Publication Date
SE8001498L true SE8001498L (en) 1980-08-28
SE439713B SE439713B (en) 1985-06-24

Family

ID=4113638

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8001498A SE439713B (en) 1979-02-27 1980-02-26 THE CONVERSION CIRCUIT TO A DIGITAL PHONE CONNECTOR FOR THE CONVERSION OF THE PULSE AMPLIFIED MODULATED SIGNALS TO THE PULSE CODE MODULATED SIGNALS AND VICE VERSA

Country Status (8)

Country Link
JP (1) JPS55120295A (en)
AT (1) AT390703B (en)
CA (1) CA1152650A (en)
DE (1) DE3007211A1 (en)
ES (1) ES488946A0 (en)
FR (1) FR2450533A1 (en)
GB (1) GB2050112B (en)
SE (1) SE439713B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4396938A (en) * 1981-07-23 1983-08-02 Rca Corporation Controlled ram signal processor
JPH0396189A (en) * 1989-09-08 1991-04-22 Nitsuko Corp Digital exchange

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2333299C3 (en) * 1973-06-29 1979-04-26 Siemens Ag, 1000 Berlin Und 8000 Muenchen Circuit arrangement for converting analog signals into PCM signals and from PCM signals into analog signals
IT998230B (en) * 1973-07-12 1976-01-20 Sits Soc It Telecom Siemens CODECODER FOR TIME DIVISION TELEPHONE SYSTEMS
US3877028A (en) * 1974-02-22 1975-04-08 Gte Automatic Electric Lab Inc Pcm encoder-decoder apparatus
IT1021020B (en) * 1974-05-27 1978-01-30 Telettra Lab Telefon COMMUNICATION SYSTEM AND DEVICES WITH CODED SIGNALS P.C.M. WITH REDUCED REDUNDANCY
JPS53147408A (en) * 1977-05-27 1978-12-22 Fujitsu Ltd Gain control system with variable time slot
JPS549511A (en) * 1977-06-24 1979-01-24 Fujitsu Ltd Digital gain control system using read only memory

Also Published As

Publication number Publication date
AT390703B (en) 1990-06-25
FR2450533A1 (en) 1980-09-26
JPS55120295A (en) 1980-09-16
DE3007211A1 (en) 1980-09-04
ES8104683A1 (en) 1981-04-16
ES488946A0 (en) 1981-04-16
GB2050112B (en) 1983-05-25
CA1152650A (en) 1983-08-23
SE439713B (en) 1985-06-24
FR2450533B1 (en) 1984-04-06
GB2050112A (en) 1980-12-31
ATA108180A (en) 1989-11-15

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