ES8104683A1 - PCM and PAM conversion circuit including signal level variation on the PCM portion of the circuit - Google Patents

PCM and PAM conversion circuit including signal level variation on the PCM portion of the circuit

Info

Publication number
ES8104683A1
ES8104683A1 ES488946A ES488946A ES8104683A1 ES 8104683 A1 ES8104683 A1 ES 8104683A1 ES 488946 A ES488946 A ES 488946A ES 488946 A ES488946 A ES 488946A ES 8104683 A1 ES8104683 A1 ES 8104683A1
Authority
ES
Spain
Prior art keywords
pcm
signals
line
conversion circuit
pam
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
ES488946A
Other languages
Spanish (es)
Other versions
ES488946A0 (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 ES8104683A1 publication Critical patent/ES8104683A1/en
Publication of ES488946A0 publication Critical patent/ES488946A0/en
Granted legal-status Critical Current

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)
  • 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)
  • Time-Division Multiplex Systems (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.
ES488946A 1979-02-27 1980-02-26 IMPROVEMENTS IN CONVERSION CIRCUITS TO INTERFACE DIGITAL SIGNALS AND MODULATION OF PULSE AMPLITUDE (PAM) AND TO SELECTLY MODIFY THE DIGITAL SIGNAL Granted ES488946A0 (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
ES8104683A1 true ES8104683A1 (en) 1981-04-16
ES488946A0 ES488946A0 (en) 1981-04-16

Family

ID=4113638

Family Applications (1)

Application Number Title Priority Date Filing Date
ES488946A Granted ES488946A0 (en) 1979-02-27 1980-02-26 IMPROVEMENTS IN CONVERSION CIRCUITS TO INTERFACE DIGITAL SIGNALS AND MODULATION OF PULSE AMPLITUDE (PAM) AND TO SELECTLY MODIFY THE DIGITAL SIGNAL

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
DE3007211A1 (en) 1980-09-04
GB2050112B (en) 1983-05-25
JPS55120295A (en) 1980-09-16
ATA108180A (en) 1989-11-15
CA1152650A (en) 1983-08-23
FR2450533B1 (en) 1984-04-06
SE439713B (en) 1985-06-24
FR2450533A1 (en) 1980-09-26
ES488946A0 (en) 1981-04-16
SE8001498L (en) 1980-08-28
GB2050112A (en) 1980-12-31

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