GB892466A - Improvements in or relating to tone control systems - Google Patents

Improvements in or relating to tone control systems

Info

Publication number
GB892466A
GB892466A GB13501/58A GB1350158A GB892466A GB 892466 A GB892466 A GB 892466A GB 13501/58 A GB13501/58 A GB 13501/58A GB 1350158 A GB1350158 A GB 1350158A GB 892466 A GB892466 A GB 892466A
Authority
GB
United Kingdom
Prior art keywords
valve
tone
switches
value
contrast expansion
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
GB13501/58A
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.)
TELEFFUNKEN GmbH
Original Assignee
TELEFFUNKEN GmbH
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 TELEFFUNKEN GmbH filed Critical TELEFFUNKEN GmbH
Publication of GB892466A publication Critical patent/GB892466A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G5/00Tone control or bandwidth control in amplifiers
    • H03G5/02Manually-operated control
    • H03G5/04Manually-operated control in untuned amplifiers
    • H03G5/06Manually-operated control in untuned amplifiers having discharge tubes
    • H03G5/08Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

892,466. Tone controlling; volume expansion. TELEFUNKEN G.m.b.H. April 29, 1958 [April 30, 1957], No. 13501/58. Class 40 (4). [Also in Group XL (c)] A tone-control system comprises switching means for effecting different tone adjustments, said switching means also controlling the contrast expansion. As shown, the incoming signal after amplification at 1 is applied to a potentiometer comprising resistor 3 (and possibly 4) in series with the anode cathode path of valve 6 whose conductivity is varied in accordance with the amplitude of the output signal from valve 1, which is amplified, rectified and applied in a negative sense to the grid of the valve 6. The signal thus expanded is applied to an amplifier 19, 20 whose feed-back path is provided with four-position ganged tone control switches 24, 25, 26 to produce the various tone conditions. Ganged to these switches are switches 16, 17 arranged to change the contrast expansion conditions. Thus, switch 16 either includes or omits resistor 4 from the potentiometer comprising resistance 3 and the variable impedance of the valve 6, so varying the degree of contrast expansion. Switch 17 controls the value of the potential applied to the grid of the valve 6 and hence the value at which the valve 6 cuts-off, i.e. the value of the input signal at which contrast expansion ceases. The switches may be replaced by four pushbuttons. The invention may be applied to radio-receiving apparatus or reproducing apparatus.
GB13501/58A 1957-04-30 1958-04-29 Improvements in or relating to tone control systems Expired GB892466A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE892466X 1957-04-30

Publications (1)

Publication Number Publication Date
GB892466A true GB892466A (en) 1962-03-28

Family

ID=6846323

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13501/58A Expired GB892466A (en) 1957-04-30 1958-04-29 Improvements in or relating to tone control systems

Country Status (1)

Country Link
GB (1) GB892466A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4716316A (en) * 1985-02-04 1987-12-29 Varian Associates, Inc. Full wave, self-detecting differential logarithmic rf amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4716316A (en) * 1985-02-04 1987-12-29 Varian Associates, Inc. Full wave, self-detecting differential logarithmic rf amplifier

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