GB892466A - Improvements in or relating to tone control systems - Google Patents
Improvements in or relating to tone control systemsInfo
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/02—Manually-operated control
- H03G5/04—Manually-operated control in untuned amplifiers
- H03G5/06—Manually-operated control in untuned amplifiers having discharge tubes
- H03G5/08—Manually-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.
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)
| 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 |
-
1958
- 1958-04-29 GB GB13501/58A patent/GB892466A/en not_active Expired
Cited By (1)
| 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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