GB934610A - Improvements in or relating to means for controlling the amplitude of a signal in anamplifier - Google Patents
Improvements in or relating to means for controlling the amplitude of a signal in anamplifierInfo
- Publication number
- GB934610A GB934610A GB2439861A GB2439861A GB934610A GB 934610 A GB934610 A GB 934610A GB 2439861 A GB2439861 A GB 2439861A GB 2439861 A GB2439861 A GB 2439861A GB 934610 A GB934610 A GB 934610A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- lamp
- resistor
- increases
- light
- 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
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
- H03G3/24—Control dependent upon ambient noise level or sound level
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
934,610. Photo-electric control systems. E. K. COLE Ltd., and J. A. JACKSON. June 21, 1962, No. 24398/61. Class 40 (3). [Also in Group XL (c)] The gain of an amplifier is controlled by a light sensitive cell used as a variable resistor in the input circuit, the light affecting the cell being obtained from a lamp energized by electric impulses derived from the ignition circuit of a motor car or the like. Lamp LP2, Fig. 1, shunted by resistor R1, is coupled to the distributer contacts of the car over capacitor C1, auxiliary lamp LP1, and an R.F. suppressor circuit comprising choke CH 1 and shunt capacitor C2. In a car radio receiver light sensitive cell P, Fig. 2, forms with the volume control R2 a potentiometer between the output of the diode detector and the input of audio amplifier V1. Resistor R4 applies a positive bias to the cell P in order to prevent distortion which occurs if the voltage across the cell becomes zero. Lamp LP2 and cell P are placed at either end of an opaque tube in order to exclude extraneous light, a green filter being interposed so that the cell is not affected by red light. The arrangement is such that as the speed of the engine increases, the number of differentiated pulses from capacitor C1 increases and so the brightness of the lamp LP2; this reduces the resistance of the cell P and so increases the volume with receiver. Lamp LP1 acts as a voltage variable resistor, increasing its resistance as the number of impulses increases, and so prevents the rate of increase of illumination of the lamp LP2 being too rapid; this effect may also be produced by replacing resistor R1 by a Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2439861A GB934610A (en) | 1961-07-06 | 1961-07-06 | Improvements in or relating to means for controlling the amplitude of a signal in anamplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2439861A GB934610A (en) | 1961-07-06 | 1961-07-06 | Improvements in or relating to means for controlling the amplitude of a signal in anamplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB934610A true GB934610A (en) | 1963-08-21 |
Family
ID=10211116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2439861A Expired GB934610A (en) | 1961-07-06 | 1961-07-06 | Improvements in or relating to means for controlling the amplitude of a signal in anamplifier |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB934610A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2373915A1 (en) * | 1976-12-07 | 1978-07-07 | Zerbi Jean | Vehicle radio or cassette player - has sound level regulator automatically adjusting sound volume as function of mean value of ambient noise |
| GB2207533A (en) * | 1987-07-31 | 1989-02-01 | Suzuki Motor Co | Audio alarm outputting device for outboard engine |
| GB2256102A (en) * | 1991-05-24 | 1992-11-25 | Robin Middlemass Howie | Automatic level controller for in-vehicle sound system |
-
1961
- 1961-07-06 GB GB2439861A patent/GB934610A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2373915A1 (en) * | 1976-12-07 | 1978-07-07 | Zerbi Jean | Vehicle radio or cassette player - has sound level regulator automatically adjusting sound volume as function of mean value of ambient noise |
| GB2207533A (en) * | 1987-07-31 | 1989-02-01 | Suzuki Motor Co | Audio alarm outputting device for outboard engine |
| GB2207533B (en) * | 1987-07-31 | 1992-03-18 | Suzuki Motor Co | Audio alarm outputting device for outboard engine |
| GB2256102A (en) * | 1991-05-24 | 1992-11-25 | Robin Middlemass Howie | Automatic level controller for in-vehicle sound system |
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