GB478734A - Improvements in or relating to thermionic valve circuits - Google Patents

Improvements in or relating to thermionic valve circuits

Info

Publication number
GB478734A
GB478734A GB1429036A GB1429036A GB478734A GB 478734 A GB478734 A GB 478734A GB 1429036 A GB1429036 A GB 1429036A GB 1429036 A GB1429036 A GB 1429036A GB 478734 A GB478734 A GB 478734A
Authority
GB
United Kingdom
Prior art keywords
diodes
attenuating
arrangement
frequency path
frequencies
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
GB1429036A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1429036A priority Critical patent/GB478734A/en
Publication of GB478734A publication Critical patent/GB478734A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
    • H03G9/10—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for tone control and volume expansion or compression

Landscapes

  • Networks Using Active Elements (AREA)
  • Electron Tubes For Measurement (AREA)

Abstract

478,734. Automatic tone control. PERCIVAL, W. S. May 20. 1936, No. 14290. [Class 40 (iv)] [Also in Group XL] In a transmission system (broadcast or television receiver or transmitter or gramophone recording or reproducing circuit) mush, needle scratch and the like are minimized by providing separate paths for the high and low frequencies and attenuating the higher frequencies except when they are present at a sufficient volume to mask interference. In one arrangement, Fig. 1. (not shown), the high-frequency path includes in series a pair of oppositely directed diodes in parallel so that it only passes signals of above a pre-determined amplitude. A filter connected to the output circuit suppresses harmonics introduced by this arrangement. In a modification, the high-frequency path is shunted by diodes 31, 32 which arc rendered non-conducting by the rectifiers 29, 30 when high frequencies are present at a sufficient level. Delay networks 25, 33 are connected as shown. The gain of amplifier 28 or the bias potentials normally applied to the attenuating diodes may be adjustable. The diodes may be conllected in a balanced bridge to avoid the effect. of their capacity. U.S.A. Specification 2,009,229 is referred to.
GB1429036A 1936-05-20 1936-05-20 Improvements in or relating to thermionic valve circuits Expired GB478734A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1429036A GB478734A (en) 1936-05-20 1936-05-20 Improvements in or relating to thermionic valve circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1429036A GB478734A (en) 1936-05-20 1936-05-20 Improvements in or relating to thermionic valve circuits

Publications (1)

Publication Number Publication Date
GB478734A true GB478734A (en) 1938-01-20

Family

ID=10038492

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1429036A Expired GB478734A (en) 1936-05-20 1936-05-20 Improvements in or relating to thermionic valve circuits

Country Status (1)

Country Link
GB (1) GB478734A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552232A (en) * 1946-03-27 1951-05-08 Philco Corp Automatic gain control
US4540946A (en) * 1980-06-06 1985-09-10 National Research Development Corp. Variable characteristic filters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552232A (en) * 1946-03-27 1951-05-08 Philco Corp Automatic gain control
US4540946A (en) * 1980-06-06 1985-09-10 National Research Development Corp. Variable characteristic filters

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