GB1109048A - Coding equipment for p.c.m. systems - Google Patents

Coding equipment for p.c.m. systems

Info

Publication number
GB1109048A
GB1109048A GB27602/66A GB2760266A GB1109048A GB 1109048 A GB1109048 A GB 1109048A GB 27602/66 A GB27602/66 A GB 27602/66A GB 2760266 A GB2760266 A GB 2760266A GB 1109048 A GB1109048 A GB 1109048A
Authority
GB
United Kingdom
Prior art keywords
signal
feedback
difference
analogue
coding elements
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
GB27602/66A
Inventor
Ryszard Kitajewski
Joseph Hood Mcneilly
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 GB27602/66A priority Critical patent/GB1109048A/en
Publication of GB1109048A publication Critical patent/GB1109048A/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
    • H03M1/34—Analogue value compared with reference values

Landscapes

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

Abstract

1,109,048. Analogue to digital converters. STANDARD TELEPHONES & CABLES Ltd. 21 June, 1966, No. 27602/66. Heading G4H. In a P.C.M. system the coder comprises a plurality of bi-stable coding elements, 1-64, each having a different weight, means (junction A) for generating a signal representing the difference between the analogue value and the sum of the weights of those coding elements set, a bi-stable feedback element set when the analogue signal is exceeded to generate a feedback signal, and means for applying the difference signal and the feedback signal (if any) with the correct polarity to the coding elements. A damped oscillatory waveform is superimposed on the combined difference and feedback signal and the coding elements set sequentially until a balance is reached. The signal from the feedback element, which appears when the analogue input is exceeded, is applied to the inverted difference signal at B so that some of the lower-valued elements are switched off. The difference signal then becomes positive again and the feedback signal ceases. The feedback element stabilizes the operation of the system. In order that this shall operate in both directions the threshold levels at which the coding elements are set is biased by half the value of the feedback signal. In addition a dummy coding element D is provided, the weight of which is smaller than the smallest digit value but greater than the threshold level of the feedback element. Alternatively short pulses could be imposed on the difference signal having an amplitude just greater than the feedback element threshold level. The circuit is described in detail, Fig. 4 (not shown).
GB27602/66A 1966-06-21 1966-06-21 Coding equipment for p.c.m. systems Expired GB1109048A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB27602/66A GB1109048A (en) 1966-06-21 1966-06-21 Coding equipment for p.c.m. systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27602/66A GB1109048A (en) 1966-06-21 1966-06-21 Coding equipment for p.c.m. systems

Publications (1)

Publication Number Publication Date
GB1109048A true GB1109048A (en) 1968-04-10

Family

ID=10262301

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27602/66A Expired GB1109048A (en) 1966-06-21 1966-06-21 Coding equipment for p.c.m. systems

Country Status (1)

Country Link
GB (1) GB1109048A (en)

Similar Documents

Publication Publication Date Title
US3587088A (en) Multilevel pulse transmission systems employing codes having three or more alphabets
GB1218510A (en) Improvements in or relating to delta modulation systems
GB1196185A (en) Digital-to-Analog Converters
GB1250778A (en)
GB706381A (en) Improvements in or relating to electric pulse code modulation systems of communication
US3102258A (en) Binary code to analog converter
GB1109048A (en) Coding equipment for p.c.m. systems
GB1212008A (en) Improvements in or relating to resistive networks
GB1099896A (en) Encoder for sampled analogue signals
GB1136059A (en) Integrator or synchronizer systems
US3469256A (en) Analog-to-digital converter
GB1014358A (en) Pulse converting system
GB1165170A (en) Improvements in or relating to Coding Systems
GB862855A (en) Improvements in or relating to coders for electric pulse code modulation systems
GB1007951A (en) Improvements in or relating to signal amplitude coders
GB1069930A (en) Improvements in or relating to data transmission systems
SU473313A1 (en) Digital compander
GB1060836A (en) Improvements in or relating to electrical circuits
SE313594B (en)
GB1046930A (en) Coding equipment for pulse code modulation systems
GB893624A (en) A parallel-to-series converter for electronic computers
GB1135684A (en) Analogue-to-digital converters
GB1104647A (en) Decoder for p.c.m.
GB972776A (en) Improvements in or relating to radar display apparatus
SU120615A1 (en) Device for coding electrical signals with the optimal Shannon-Fano code