GB528274A - Reduction of distortion in electric signal transmission systems - Google Patents

Reduction of distortion in electric signal transmission systems

Info

Publication number
GB528274A
GB528274A GB13107/39A GB1310739A GB528274A GB 528274 A GB528274 A GB 528274A GB 13107/39 A GB13107/39 A GB 13107/39A GB 1310739 A GB1310739 A GB 1310739A GB 528274 A GB528274 A GB 528274A
Authority
GB
United Kingdom
Prior art keywords
grid
control
resistance
valve
distortion
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
GB13107/39A
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
Publication of GB528274A publication Critical patent/GB528274A/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
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H04L25/062—Setting decision thresholds using feedforward techniques only

Abstract

528,274. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. May 2, 1939, No. 13107. Convention date, May 19, 1938. [Class 40 (v)] To prevent distortion, telegraph signals are applied to the control grid of an amplifier, whilst an auxiliary grid is supplied with a unidirectional control voltage which is dependent upon the signals, but is derived from a circuit independent of the particular amplifier used, the auxiliary grid current being used for gain-control in the signal-transmission circuit. As shown, carrier telegraph signals are demodulated by the rectifier bridge D, the control grid of the relay-operating valve T3 being connected through a high-resistance 13 to the bridge load resistance 6. The suppressor grid of valve T3 is connected to an adjustable tapping 15 on resistance 6, and its grid current flows through the biasing resistance 16 of the carrier-frequency valve T1 to reduce its gain.
GB13107/39A 1938-05-19 1939-05-02 Reduction of distortion in electric signal transmission systems Expired GB528274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US528274XA 1938-05-19 1938-05-19

Publications (1)

Publication Number Publication Date
GB528274A true GB528274A (en) 1940-10-25

Family

ID=21980160

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13107/39A Expired GB528274A (en) 1938-05-19 1939-05-02 Reduction of distortion in electric signal transmission systems

Country Status (3)

Country Link
DE (1) DE881058C (en)
GB (1) GB528274A (en)
NL (1) NL63636C (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB378539A (en) * 1930-04-29 1932-08-18 Marconi Wireless Telegraph Co Improvements in or relating to audio frequency amplifier arrangements
FR757986A (en) * 1932-07-04 1934-01-05 Thomson Houston Comp Francaise Improvements to electronic tubes and their circuits

Also Published As

Publication number Publication date
DE881058C (en) 1953-06-25
NL63636C (en)

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