GB1029052A - Improvements in or relating to gain control circuit arrangements - Google Patents

Improvements in or relating to gain control circuit arrangements

Info

Publication number
GB1029052A
GB1029052A GB1389063A GB1389063A GB1029052A GB 1029052 A GB1029052 A GB 1029052A GB 1389063 A GB1389063 A GB 1389063A GB 1389063 A GB1389063 A GB 1389063A GB 1029052 A GB1029052 A GB 1029052A
Authority
GB
United Kingdom
Prior art keywords
amplifier
signal
thermistor
gain
output
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
GB1389063A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1029052A publication Critical patent/GB1029052A/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
    • H04B3/12—Control of transmission; Equalising by pilot signal in negative-feedback path of line amplifier

Landscapes

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

Abstract

1,029,052. Pilot controlled A.G.C. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. April 8, 1963 [April 11, 1962], No. 13890/63. Heading H4R. In a carrier wave telephony system a pilotcontrolled gain arrangement comprises a signal amplifier having a gain controlling negative feedback circuit including a thermistor the current through which is derived from the pilot signal at the output of the signal amplifier. Fig. 1 shows a signal amplifier 2 from the output of which the pilot signal is extracted by filter 3 and applied via amplifier 4 to a rectifier 5, the resulting D.C. signal is amplified in amplifier 8 in whose output circuit is connected the thermistor 7 the impedance of which is reflected, via transformer 17, into the gain controlling feedback circuit 6 of amplifier 2. The D.C. amplifier 8 has negative feedback from the output circuit to the input via resistors 21 and 22, this arrangement giving a lower gain to rapid changes of pilot signal in amplifier 8 due to the thermal inertia of the thermistor.
GB1389063A 1962-04-11 1963-04-08 Improvements in or relating to gain control circuit arrangements Expired GB1029052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL277106A NL277106A (en) 1962-04-11 1962-04-11

Publications (1)

Publication Number Publication Date
GB1029052A true GB1029052A (en) 1966-05-11

Family

ID=19753753

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1389063A Expired GB1029052A (en) 1962-04-11 1963-04-08 Improvements in or relating to gain control circuit arrangements

Country Status (6)

Country Link
BE (1) BE630820A (en)
CH (1) CH410066A (en)
DE (1) DE1190994B (en)
DK (1) DK104420C (en)
GB (1) GB1029052A (en)
NL (1) NL277106A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB693255A (en) * 1951-04-12 1953-06-24 Automatic Telephone & Elect Improvements in or relating to carrier current transmission systems
NL105186C (en) * 1958-12-12

Also Published As

Publication number Publication date
NL277106A (en) 1964-03-10
BE630820A (en) 1963-11-14
DE1190994B (en) 1965-04-15
CH410066A (en) 1966-03-31
DK104420C (en) 1966-05-16

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