GB498235A - Process and apparatus for volume range expansion applied to the reproduction of electric oscillations - Google Patents

Process and apparatus for volume range expansion applied to the reproduction of electric oscillations

Info

Publication number
GB498235A
GB498235A GB1888937A GB1888937A GB498235A GB 498235 A GB498235 A GB 498235A GB 1888937 A GB1888937 A GB 1888937A GB 1888937 A GB1888937 A GB 1888937A GB 498235 A GB498235 A GB 498235A
Authority
GB
United Kingdom
Prior art keywords
logarithmic
signal
volume
control
log
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
GB1888937A
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.)
KARL HERMAN FRANZ SCHLEGEL
Original Assignee
KARL HERMAN FRANZ SCHLEGEL
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 KARL HERMAN FRANZ SCHLEGEL filed Critical KARL HERMAN FRANZ SCHLEGEL
Priority to GB1888937A priority Critical patent/GB498235A/en
Publication of GB498235A publication Critical patent/GB498235A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

498,235. Automatic volume control. KOLB, O. K. (Schlegel, K. H. F.) July 7, 1937, No. 18889. [Class 40 (iv)] [Also in Group XL] In a soundreproducing circuit giving volume-range expansion, the degree of expansion is adjustable without affecting the maximum volume by means of a linear potentiometer P1, which controls the proportion of a biassing voltage, derived from the acoustic signals or from a pilot signal, to be applied to a variable gain or loss device having an exponential or logarithmic law, and is ganged to a logarithmic potentiometer P2 controlling the over-all gain independently of the amplitude of the signals, e.g. by adjusting the acoustic signal input. Additional potentiometers P3, P4 are connected as shown, the former being adjusted initially to ensure correct relations between the effects of PI and P2, and the latter being adjusted to control the maximum volume. When compression has been effected so that a1/a2=k.log t1/t2 where a1, a2 are the signal amplitudes corresponding respectively to coefficients of transmission t1, t2 in the compressor, the control voltage for the expander can be obtained by direct rectification of a portion of the signal currents. When, however, the compression is such that log a1/a2=k.logt1/t2, a portion of the signal currents must be passed through a logarithmic compressor before rectification to furnish the control voltage. Specification 354,605, [Group XL], is referred to.
GB1888937A 1937-07-07 1937-07-07 Process and apparatus for volume range expansion applied to the reproduction of electric oscillations Expired GB498235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1888937A GB498235A (en) 1937-07-07 1937-07-07 Process and apparatus for volume range expansion applied to the reproduction of electric oscillations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1888937A GB498235A (en) 1937-07-07 1937-07-07 Process and apparatus for volume range expansion applied to the reproduction of electric oscillations

Publications (1)

Publication Number Publication Date
GB498235A true GB498235A (en) 1939-01-05

Family

ID=10120159

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1888937A Expired GB498235A (en) 1937-07-07 1937-07-07 Process and apparatus for volume range expansion applied to the reproduction of electric oscillations

Country Status (1)

Country Link
GB (1) GB498235A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530101A (en) * 1941-07-29 1950-11-14 Hartford Nat Bank & Trust Co Low-frequency amplifying circuits with negative feedback
ES2270690A1 (en) * 2005-01-21 2007-04-01 Maria Teresa Pablos Fernandez Logarithmic circuit voltage regulator for e.g. TV amplifier, has linear potentiometer for logarithmic variation of output impedance, and diode and resistor for maximum and minimum voltage fixation provided at output of linear potentiometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2530101A (en) * 1941-07-29 1950-11-14 Hartford Nat Bank & Trust Co Low-frequency amplifying circuits with negative feedback
ES2270690A1 (en) * 2005-01-21 2007-04-01 Maria Teresa Pablos Fernandez Logarithmic circuit voltage regulator for e.g. TV amplifier, has linear potentiometer for logarithmic variation of output impedance, and diode and resistor for maximum and minimum voltage fixation provided at output of linear potentiometer

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