GB876305A - Improvements in or relating to electrical signalling systems - Google Patents

Improvements in or relating to electrical signalling systems

Info

Publication number
GB876305A
GB876305A GB14801/60A GB1480160A GB876305A GB 876305 A GB876305 A GB 876305A GB 14801/60 A GB14801/60 A GB 14801/60A GB 1480160 A GB1480160 A GB 1480160A GB 876305 A GB876305 A GB 876305A
Authority
GB
United Kingdom
Prior art keywords
relating
signalling systems
impedance
electrical signalling
electrical
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
GB14801/60A
Inventor
John Albert Barrett
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.)
British Telecommunications PLC
British Telecommunications Research Ltd
Original Assignee
British Telecommunications PLC
British Telecommunications Research 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 British Telecommunications PLC, British Telecommunications Research Ltd filed Critical British Telecommunications PLC
Publication of GB876305A publication Critical patent/GB876305A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
    • C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
    • C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
    • C07C51/27—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with oxides of nitrogen or nitrogen-containing mineral acids
    • C07C51/275—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with oxides of nitrogen or nitrogen-containing mineral acids of hydrocarbyl groups

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

876,305. Automatic volume control. BRITISH TELECOMMUNICATION RESEARCH Ltd. April 27, 1960, No. 14801/60. Addition to 864,442. Class 40 (4). In a modification of the automatic gain regulator described in the parent Specification a tapped impedance IP is connected across the secondary of the transformer TR and the compensating impedance Z is connected to the tapping on the impedance IP.
GB14801/60A 1955-01-24 1960-04-27 Improvements in or relating to electrical signalling systems Expired GB876305A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US335649XA 1955-01-24 1955-01-24

Publications (1)

Publication Number Publication Date
GB876305A true GB876305A (en) 1961-08-30

Family

ID=21871146

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1548/57A Expired GB846442A (en) 1955-01-24 1957-01-15 Improvements relating to the production of phthalic acids from xylenes
GB14801/60A Expired GB876305A (en) 1955-01-24 1960-04-27 Improvements in or relating to electrical signalling systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1548/57A Expired GB846442A (en) 1955-01-24 1957-01-15 Improvements relating to the production of phthalic acids from xylenes

Country Status (3)

Country Link
CH (1) CH335649A (en)
FR (1) FR1142486A (en)
GB (2) GB846442A (en)

Also Published As

Publication number Publication date
FR1142486A (en) 1957-09-18
GB846442A (en) 1960-08-31
CH335649A (en) 1959-01-31

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