GB366937A - Improvements in or relating to electron discharge amplification systems - Google Patents

Improvements in or relating to electron discharge amplification systems

Info

Publication number
GB366937A
GB366937A GB33823/30A GB3382330A GB366937A GB 366937 A GB366937 A GB 366937A GB 33823/30 A GB33823/30 A GB 33823/30A GB 3382330 A GB3382330 A GB 3382330A GB 366937 A GB366937 A GB 366937A
Authority
GB
United Kingdom
Prior art keywords
valve
controlled
output
filter
accordance
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
GB33823/30A
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
Publication of GB366937A publication Critical patent/GB366937A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers
    • H03G5/20—Automatic control in untuned amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers
    • H03G5/22—Automatic control in untuned amplifiers having semiconductor devices
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)
  • Networks Using Active Elements (AREA)

Abstract

366,937. Valve amplifying circuits. HAMMOND, J. H., Hesperus Avenue, Gloucester, Massachusetts, U.S.A. Nov. 10, 1930, No. 33823. Convention date, Nov. 12, 1929. [Classes 40 (iii) and 40 (v).] In an amplifier for gramophone reproduction or the like means are provided to vary the gain in accordance with the intensity. In addition means are provided to prevent overloading and control the amplification in accordance with frequency. The Figure shows a valve 5 the grid bias of which is controlled by the input from pick-up 1 or photo-electric cell 80, a network 17 serving to discriminate against the high frequencies so that extraneous noises of high pitch, e.g. scratch, are largely suppressed at low intensities. The grid bias of the valve 5 is controlled also by the output through a biased rectifier 26 so that decreased amplification is obtained with outputs in excess of a predetermined amount. A filter network 25 is provided so that low frequencies are more readily passed so that for these frequencies the limiting action occurs sooner than for high frequencies. The frequency characteristic of the amplifier is controlled by filter 13, the variable condensers 11, 12 of which are controlled by solenoid 14 in accordance with the output through biased rectifier 31. Adjustment is effected by potentiometer 38 and meter 39. In a modification, Fig. 5 (not shown), overloading is prevented by a series resistance in the grid circuit of valve 5 and by an auxiliary valve in parallel with the anode load of amplifying valve 5, the impedance of the auxiliary valve is controlled by the output by varying the grid bias. In this modification instead of an electromechanical control of the frequency modifying filter in the input a valve control is used in which valves are placed in series with the filter condensers and have their impedance controlled by the output.
GB33823/30A 1929-11-12 1930-11-10 Improvements in or relating to electron discharge amplification systems Expired GB366937A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US406571A US1979035A (en) 1929-11-12 1929-11-12 Automatic monitoring system

Publications (1)

Publication Number Publication Date
GB366937A true GB366937A (en) 1932-02-10

Family

ID=23608563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33823/30A Expired GB366937A (en) 1929-11-12 1930-11-10 Improvements in or relating to electron discharge amplification systems

Country Status (4)

Country Link
US (1) US1979035A (en)
DE (1) DE676173C (en)
FR (1) FR707999A (en)
GB (1) GB366937A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754915C (en) * 1934-08-04 1953-02-23 Hazeltine Corp Circuit for amplifying electrical vibrations, especially for low frequency amplification

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423368A (en) * 1943-09-22 1947-07-01 Rca Corp Voltage regulator
US2606969A (en) * 1946-01-17 1952-08-12 Myron T Smith Method and system for reducing noise in the transmission of electric signals
US2606971A (en) * 1946-01-19 1952-08-12 Myron T Smith Method and system for reducing noise in the transmission of electric signals
US2606972A (en) * 1946-01-23 1952-08-12 Myron T Smith System for reducing noise in the transmission of electric signals
US2580020A (en) * 1948-01-06 1951-12-25 Jr John Hays Hammond Volume expander with timing control
US2589723A (en) * 1948-12-09 1952-03-18 Bendix Aviat Corp Noise suppressor for audio circuits
US2692306A (en) * 1949-12-08 1954-10-19 Rca Corp Audio amplifier with plural automatic gain controls
US2750451A (en) * 1951-03-13 1956-06-12 Motorola Inc Audio system
DE1154833B (en) * 1959-01-12 1963-09-26 Telefunken Patent Multi-stage transistor amplifier
US3182271A (en) * 1960-12-15 1965-05-04 Aiken William Ross Tone control circuit for emphasizing low volume high and low frequency signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754915C (en) * 1934-08-04 1953-02-23 Hazeltine Corp Circuit for amplifying electrical vibrations, especially for low frequency amplification

Also Published As

Publication number Publication date
DE676173C (en) 1939-05-27
US1979035A (en) 1934-10-30
FR707999A (en) 1931-07-17

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