GB2007050A - PCM encoder/decoder arrangement - Google Patents

PCM encoder/decoder arrangement

Info

Publication number
GB2007050A
GB2007050A GB7836350A GB7836350A GB2007050A GB 2007050 A GB2007050 A GB 2007050A GB 7836350 A GB7836350 A GB 7836350A GB 7836350 A GB7836350 A GB 7836350A GB 2007050 A GB2007050 A GB 2007050A
Authority
GB
United Kingdom
Prior art keywords
amplifier
ladder
network
channel
pcm
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
GB7836350A
Other versions
GB2007050B (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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB7836350A priority Critical patent/GB2007050B/en
Publication of GB2007050A publication Critical patent/GB2007050A/en
Application granted granted Critical
Publication of GB2007050B publication Critical patent/GB2007050B/en
Expired 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
    • 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
    • H03M1/662—Multiplexed conversion systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

A dual channel PCM/Analogue Codec for speech transmission comprises a transmit channel amplifier TC and receive channel amplifier RC controllable for mutually exclusive operation by channel switches CSW, and a comparator COMP together with a ladder network LN and associated current steering switches CSS and compensated current sources CS2. In the encode mode the transmit amplifier creates a voltage across the resistors of the ladder network which is balanced by the voltage generated by the current sources. A null is consequently produced at the comparator input to govern the PCM output. In the decode mode, the transmit amplifier is switched "off" and the receive amplifier is switched "on". The PCM signal is presented to the ladder-network switches so that the ladder-network produces an analogue voltage which is applied to the receive amplifier. <IMAGE>
GB7836350A 1977-10-01 1978-09-11 Encoder/decoder arrangement Expired GB2007050B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7836350A GB2007050B (en) 1977-10-01 1978-09-11 Encoder/decoder arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4085977 1977-10-01
GB7836350A GB2007050B (en) 1977-10-01 1978-09-11 Encoder/decoder arrangement

Publications (2)

Publication Number Publication Date
GB2007050A true GB2007050A (en) 1979-05-10
GB2007050B GB2007050B (en) 1982-02-03

Family

ID=26264524

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7836350A Expired GB2007050B (en) 1977-10-01 1978-09-11 Encoder/decoder arrangement

Country Status (1)

Country Link
GB (1) GB2007050B (en)

Also Published As

Publication number Publication date
GB2007050B (en) 1982-02-03

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19970911