GB352772A - Improvements in or relating to amplifiers for reproducing sound - Google Patents

Improvements in or relating to amplifiers for reproducing sound

Info

Publication number
GB352772A
GB352772A GB24027/30A GB2402730A GB352772A GB 352772 A GB352772 A GB 352772A GB 24027/30 A GB24027/30 A GB 24027/30A GB 2402730 A GB2402730 A GB 2402730A GB 352772 A GB352772 A GB 352772A
Authority
GB
United Kingdom
Prior art keywords
resistance
impedance
ear
amplifiers
relating
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
GB24027/30A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB352772A publication Critical patent/GB352772A/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
    • H03G9/06—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control

Landscapes

  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

352,772. Valve amplifying circuits. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. Aug. 11, 1930, No. 24027. Convention date, Sept. 25, 1929. [Class 40 (v).] A method of volume control designed to preserve a correct balance of tonality, as perceived by the ear, over a wide range of absolute sound intensity, comprises an impedance network 6, 7, C, L, which may be shunted across the primary or secondary windings of the intervalve transformer 2. The voltage is applied to and taken off from the impedance between one of the ends of the resistance and a variable tapping 9 on the resistance 6, 7, the elements C, L preferably being made resonant to the band of frequencies to which the human ear is most sensitive. The inductance L and capacity C may be replaced by a number of similar resonant combinations arranged in parallel across the potentiometer 6, 7.
GB24027/30A 1929-09-25 1930-08-11 Improvements in or relating to amplifiers for reproducing sound Expired GB352772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL352772X 1929-09-25

Publications (1)

Publication Number Publication Date
GB352772A true GB352772A (en) 1931-07-16

Family

ID=19785101

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24027/30A Expired GB352772A (en) 1929-09-25 1930-08-11 Improvements in or relating to amplifiers for reproducing sound

Country Status (1)

Country Link
GB (1) GB352772A (en)

Similar Documents

Publication Publication Date Title
GB194424A (en) Improvements in electro-magnetic apparatus for recording sound
GB352772A (en) Improvements in or relating to amplifiers for reproducing sound
US2140969A (en) Hearing aid apparatus
US2342822A (en) Amplifying system
US2008702A (en) Amplifying system
US2068685A (en) Transmission of sound currents
US2231863A (en) Biresonant circuit
US2218400A (en) Equalizer
US1785048A (en) System for electrically transmitting and reproducing sound
US2096757A (en) Sound reproduction system
GB446346A (en) High-frequency transformer circuits, more particularly for television purposes
GB370369A (en) Improvements in apparatus for use by persons suffering from aural defects
US1715501A (en) Audio frequency amplifier circuit
GB369745A (en) Improvements in or relating to loudspeaker installations provided with a filter
GB312979A (en) Improvements in loud speakers and the like
GB501211A (en) Improvements in or relating to high frequency amplifiers
GB409360A (en) Improvements in alternating current signal generators and amplifiers
GB481830A (en) Improved method and apparatus for sound recording
GB344373A (en) Improvements in or relating to devices for controlling the timbre of sounds reproduced by electrical means
US2069316A (en) Transmission of sound currents
SU60532A1 (en) Audio amplifier
GB332717A (en) Improvements relating to thermionic amplifiers
GB447622A (en) Improvements in or relating to thermionic amplifiers for use with electric gramophones and the like
GB311466A (en) Improvements in or relating to audio frequency thermionic amplifiers
GB388766A (en) Improvements in or relating to thermionic valve amplifiers