GB1251011A - - Google Patents

Info

Publication number
GB1251011A
GB1251011A GB1251011DA GB1251011A GB 1251011 A GB1251011 A GB 1251011A GB 1251011D A GB1251011D A GB 1251011DA GB 1251011 A GB1251011 A GB 1251011A
Authority
GB
United Kingdom
Prior art keywords
comparator
capacitor
sampling
positive
negative
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
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 filed Critical
Publication of GB1251011A publication Critical patent/GB1251011A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C27/00—Electric analogue stores, e.g. for storing instantaneous values
    • G11C27/02—Sample-and-hold arrangements
    • G11C27/024—Sample-and-hold arrangements using a capacitive memory element

Abstract

1,251,011. Coding and decoding. STANDARD TELEPHONES & CABLES Ltd. 1 Jan., 1970, No. 12/70. Heading H4P. In a circuit converting a first binary code represented by a positive followed by a negative potential and a negative followed by a positive potential into a second binary code form represented by positive and negative potentials, each incoming first code element is sampled during its first portion and stoved temporarily in analogue form then compared in a comparator with the second portion to determine the significance of the element. The comparator is only effective during the second portion. An incoming signal IP is amplified and fed to a capacitor through a sampling gate SG enabled by sampling pulses tl, see Fig. 1 (not shown) the capacitor voltage being compared in a comparator COMP with the signal during second sampling periods t2. The output of the comparator displaces a JK flip flop to a corresponding 1 or 0 condition. The sampling gate comprises cascaded transistors (T1, T2) Fig. 3 (not shown) which are rendered conductive by t1 pulses; hence a capacitor C charges through another transistor (t3) if the pulse on T2 is higher than the capacitor charge, or C discharges through a diode D if the pulse on T2 is lower.
GB1251011D 1970-01-01 1970-01-01 Expired GB1251011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1270 1970-01-01

Publications (1)

Publication Number Publication Date
GB1251011A true GB1251011A (en) 1971-10-27

Family

ID=9696781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1251011D Expired GB1251011A (en) 1970-01-01 1970-01-01

Country Status (1)

Country Link
GB (1) GB1251011A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2210867A1 (en) * 1972-12-14 1974-07-12 Philips Nv

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2210867A1 (en) * 1972-12-14 1974-07-12 Philips Nv

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PLNP Patent lapsed through nonpayment of renewal fees