GB737499A - An automatic gain control arrangement using a pilot voltage - Google Patents

An automatic gain control arrangement using a pilot voltage

Info

Publication number
GB737499A
GB737499A GB9069/53A GB906953A GB737499A GB 737499 A GB737499 A GB 737499A GB 9069/53 A GB9069/53 A GB 9069/53A GB 906953 A GB906953 A GB 906953A GB 737499 A GB737499 A GB 737499A
Authority
GB
United Kingdom
Prior art keywords
amplifier
gain
variable
pilot
valve
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
GB9069/53A
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 GB737499A publication Critical patent/GB737499A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

737,499. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. April 1, 1953 [May 14, 1952], No. 9069/53. Drawings to Specification. Class 40 (4). In an automatic volume control arrangement of the type in which the gain of an amplifier, through which both the signal waves and a pilot wave pass, is controlled by the rectified pilot wave, the output current of the amplifier controls the resistance of a variable resistor which forms part of a device separate from the amplifier, which device provides an additional control of the signal level. In a carrier system in which the carrier is transmitted, the carrier may serve as the pilot wave. In the embodiment described, the variable resistor is an indirectly heated thermistor, the heating coil of which is in the cathode lead of a variable-gain valve of the amplifier. The pilot wave is extracted from the output of this valve, rectified and applied as bias to control the gain of the valve. The resistance element of the thermistor forms part of a variable attenuation network which is connected on the input or the output side of the amplifier, and which controls the signal level in the same sense as does the variable-gain amplifier. Such a network may be replaced by another amplifier, the resistance element being connected in its negative feedback path. In a multi-channel system in which each channel of a group of channels includes a pilot-controlled variable-gain amplifier, one of these amplifiers may control the variable resistor which is connected in the negative feedback path of a group amplifier serving the group of channels.
GB9069/53A 1952-05-14 1953-04-01 An automatic gain control arrangement using a pilot voltage Expired GB737499A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE737499X 1952-05-14

Publications (1)

Publication Number Publication Date
GB737499A true GB737499A (en) 1955-09-28

Family

ID=6642583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9069/53A Expired GB737499A (en) 1952-05-14 1953-04-01 An automatic gain control arrangement using a pilot voltage

Country Status (1)

Country Link
GB (1) GB737499A (en)

Similar Documents

Publication Publication Date Title
ES389354A1 (en) Multiple stage hearing aid transistor amplifier having signal voltage controlled frequency dependent network
US3441866A (en) Amplifier regulation
GB839975A (en) Improvements in and relating to signal switched telecommunication circuits
GB775918A (en) Signal transmission circuits including compandors
ES8206116A1 (en) Variable load impedance gain-controlled amplifier
US2589133A (en) Electrical filter
GB737499A (en) An automatic gain control arrangement using a pilot voltage
US2323626A (en) Distortion control
US2772390A (en) Volume limiter device
GB524340A (en) Thermionic valve and like wave amplifying systems
GB1044979A (en) Two-way speech amplifier
US3300584A (en) Two-way telephone communication system
GB551293A (en) Improvements in automatic gain control for electrical transmission systems
GB1057308A (en) Improvements in or relating to automatic gain control circuits
GB561405A (en) Improvements in or relating to telecommunication systems
US2300366A (en) Signal transmission system
GB482382A (en) Gain regulating arrangements for electrical signalling systems
GB713224A (en) Variable attenuation correcting electrical impedance network
GB1125753A (en) Improvements in or relating to gain and attenuation control circuit arrangements
GB1286258A (en) Improvements in or relating to limiter circuits
GB624923A (en) Improvements in or relating to signal transmission systems
GB524298A (en) Improvements in and relating to electric wave amplifying systems
SE317715B (en)
GB663231A (en) Improvements in or relating to time constant control circuits for radio telephone and similar systems
GB558632A (en) Improvements in or relating to thermionic valve circuits