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GB701736A - Improvements in or relating to electric pulse code modulation communication systems - Google Patents

Improvements in or relating to electric pulse code modulation communication systems

Info

Publication number
GB701736A
GB701736A GB18216/52A GB1821652A GB701736A GB 701736 A GB701736 A GB 701736A GB 18216/52 A GB18216/52 A GB 18216/52A GB 1821652 A GB1821652 A GB 1821652A GB 701736 A GB701736 A GB 701736A
Authority
GB
United Kingdom
Prior art keywords
pulse
channel
code
microsecond
circuit
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
GB18216/52A
Inventor
Cyril Gordon Treadwell
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB18216/52A priority Critical patent/GB701736A/en
Publication of GB701736A publication Critical patent/GB701736A/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
    • H03M1/12—Analogue/digital converters
    • H03M1/14—Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

701,736. Multiplex pulse code signalling; valve gating circuits. STANDARD TELEPHONES & CABLES, Ltd. July 18, 1952, No. 18216/52. Addition to 669,617. Classes 40 (5) and 40 (6) Two coders of the type described in the parent Specification are fed with amplitude modulated pulses of the odd and even numbered channels respectively of a time division multiplex system. A 40-channel system is described using a sixelement simple addition binary code, the code element recurrence frequency being 2 Mc/s, and channel 40 carries a single synchronizing pulse of duration greater than a code pulse. Refinements to improve the accuracy of the coder and decoder are described, Figs. 3, 5 (not shown), and a clipper/ amplifier stage for the former, Fig. 6 (not shown). A circuit for producing amplitude modulated channel signal samples comprises a pentode 46 to the suppressor grid of which is applied the channel signal from terminal 9. The valve is gated on when a 3.5 microsecond channel gating pulse is applied through circuit 52, 53 to the control grid and at the same time a 0.5 microsecond pulse on lead 3 blocks the shunt rectifier 54. Specifications 587,939 and 635,472 are referred to.
GB18216/52A 1952-07-18 1952-07-18 Improvements in or relating to electric pulse code modulation communication systems Expired GB701736A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB18216/52A GB701736A (en) 1952-07-18 1952-07-18 Improvements in or relating to electric pulse code modulation communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18216/52A GB701736A (en) 1952-07-18 1952-07-18 Improvements in or relating to electric pulse code modulation communication systems

Publications (1)

Publication Number Publication Date
GB701736A true GB701736A (en) 1953-12-30

Family

ID=10108643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18216/52A Expired GB701736A (en) 1952-07-18 1952-07-18 Improvements in or relating to electric pulse code modulation communication systems

Country Status (1)

Country Link
GB (1) GB701736A (en)

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