US2171638A - Automatic volume control - Google Patents
Automatic volume control Download PDFInfo
- Publication number
- US2171638A US2171638A US62248A US6224836A US2171638A US 2171638 A US2171638 A US 2171638A US 62248 A US62248 A US 62248A US 6224836 A US6224836 A US 6224836A US 2171638 A US2171638 A US 2171638A
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- US
- United States
- Prior art keywords
- circuit
- resistance
- signal
- volume control
- tube
- 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 - Lifetime
Links
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000003534 oscillatory effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/04—Modifications of control circuit to reduce distortion caused by control
Definitions
- the method here disclosed offers the advantage that the amplifier tubes Work always upon the straight part of their characteristic, and that the risk of causing distortions inherent in a shift of the working point into curved portions of the characteristic is avoided.
- the identical aim is attainable with less expenditure in circuit elements by that in one or more coupling means a resistance is provided which is 5 traversed by the direct current of a rectifier tube,
- the said resistance may either be a damping resistance contained in the oscillatory circuit serving for coup ling, or else it may form part of a voltage divider arrangement serving for coupling.
- the variable resistance could consist, for example, of an iron-hydrogen resistance, or else of a carborundum resistance.
- l is the R. F. input tube which is coupled, optionally by way of additional R. F.
- the demodulator 2. 3 is the input circuit comprising the coil L, tuner condenser C and the regulating resistance R. This oscillatory circuit is coupled by way of condenser 55 4 with the antenna 5, and by way of condensers 6 and I with the grid and the filament, respectively, of the amplifier tube I.
- the resistance R is united with the ends of coil L and condenser C being grounded for R. F.
- the resistance is in unilateral (single pole) connection with the posi- 6 tive terminal of a current source B (not shown), while, by way of the other end, it is associated with the plate of tube 2 through a wire 8, a filter section 9, and the A. F. load resistance H1.
- the grid of tube I is connected to the grounded end 10 of the grid bias resistor [2 through a radio frequency choke coil H.
- the direct current of the rectifier tube 2 will change, and thus, also, the size of the resistance R, with the result that the circuit 3 is more strongly damped and that regulation of fading is obtained.
- a rectifier of the grid-detection type should be used in which, as known, the plate current decreases with growth of the R. F. potential.
- the demodulator would have to be of the plate-current detection type, as shown in the drawing, or else a diode.
- a tube having input and output electrodes, a tunable signal circuit connected between the input electrodes, a signal output network coupled to the output electrodes, a signal detector having a signal input circuit and an audio output circuit, an element having a non-linear resistance characteristic connected in circuit in said tunable circuit, and said element being included in the detector space current circuit whereby variations in the detector space current caused by signal amplitude variation produce corresponding current variations through said element and regulate the damping of said tunable circuit.
- a tube having input and output electrodes, a tunable signal cir- 5 cuit connected between the input electrodes, a signal output network coupled to the output electrodes, a signal detector having a signal input circuit and an audio output circuit, an element having a non-linear resistance characteristic connected in circuit in said tunable circuit, said element being of the iron-hydrogen type, and said element being included in the detector space current circuit whereby variations in the detector space current caused by signal amplitude variation produce corresponding current variations through said element and regulate the damping of said tunable circuit.
- a tube having input and output electrodes, a tunable signal circuit connected between the input electrodes, a signal output network coupled to the output electrodes, a signal detector having a signal input circuit and an audio output circuit, an element having a non-linear resistance characteristic connected in series circuit in said tunable circuit, and said element being included in the detector space current circuit whereby variations in the detector space current caused by signal amplitude variation produce corresponding current variations through said element and regulate the damping of said tunable circuit.
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- Amplifiers (AREA)
Description
Patented Sept. 5, 1939 AUTOMATIC VOLUNIE CONTROL Erich Zepler, Berlin, Germany, assignor to Telefunken Gesellschaft fiir Drahtlose Telegraphic m. b. H., Berlin, Germany, a corporation of Germany Application February 4, 1936, Serial No. 62,248 In Germany February 11, 1935 3 Claims. (Cl. 250-20) The present invention is concerned with means adapted to insure automatic volume control in which the transmission efficiency of coupling means is varied as a function of the incoming carrier wave.
Contradistinct from most of the automatic volume control means known in the prior art, in which shift of the working point of one or more amplifier tubes in dependence upon the carrier wave results in a change in the gain, the method here disclosed offers the advantage that the amplifier tubes Work always upon the straight part of their characteristic, and that the risk of causing distortions inherent in a shift of the working point into curved portions of the characteristic is avoided.
Arrangements are known from the earlier art in which a change in the transmission efficiency of the coupling means takes place. In these arrangements the plate-cathode path of an electron tube is connected in parallel relation to an oscillation circuit serving for coupling, while upon the control grid a potential is impressed which is a function of the incoming carrier wave. This potential '5 suitably produced by the plate direct current resulting from the rectification, and the same alters the internal resistance in such a way that by the more or less appreciable damping of the oscillatory circuit which is incidentally occasioned, automatic volume control is obtained.
Now, according to my present invention, the identical aim is attainable with less expenditure in circuit elements by that in one or more coupling means a resistance is provided which is 5 traversed by the direct current of a rectifier tube,
and which changes in value as a function of the size of the said direct current. The said resistance may either be a damping resistance contained in the oscillatory circuit serving for coup ling, or else it may form part of a voltage divider arrangement serving for coupling. The variable resistance could consist, for example, of an iron-hydrogen resistance, or else of a carborundum resistance.
The present invention shall be explained by reference to the drawing which illustrates an exemplified embodiment of the basic concept of the invention. l is the R. F. input tube which is coupled, optionally by way of additional R. F.
;o amplifier stages or else a mixer tube and an I. F. amplifier stage, with the demodulator 2. 3 is the input circuit comprising the coil L, tuner condenser C and the regulating resistance R. This oscillatory circuit is coupled by way of condenser 55 4 with the antenna 5, and by way of condensers 6 and I with the grid and the filament, respectively, of the amplifier tube I. The resistance R is united with the ends of coil L and condenser C being grounded for R. F. The resistance is in unilateral (single pole) connection with the posi- 6 tive terminal of a current source B (not shown), while, by way of the other end, it is associated with the plate of tube 2 through a wire 8, a filter section 9, and the A. F. load resistance H1. The grid of tube I is connected to the grounded end 10 of the grid bias resistor [2 through a radio frequency choke coil H.
Now, if strong signals come in, the direct current of the rectifier tube 2 will change, and thus, also, the size of the resistance R, with the result that the circuit 3 is more strongly damped and that regulation of fading is obtained. If the resistance presents a characteristic curve which falls with growth of the current, then a rectifier of the grid-detection type should be used in which, as known, the plate current decreases with growth of the R. F. potential. Using for the resistance R, for instance, an iron-hydrogen resistance whose resistance value grows also with growth of the current, then the demodulator would have to be of the plate-current detection type, as shown in the drawing, or else a diode.
By means of an arrangement of the kind here disclosed it is possible to handle, also, in the first grid relatively larger radio frequency amplitudes than has been possible in the methods heretofore most generally used in which the amplification of the tubes is altered.
What is claimed is:
1. In a signal receiving system, a tube having input and output electrodes, a tunable signal circuit connected between the input electrodes, a signal output network coupled to the output electrodes, a signal detector having a signal input circuit and an audio output circuit, an element having a non-linear resistance characteristic connected in circuit in said tunable circuit, and said element being included in the detector space current circuit whereby variations in the detector space current caused by signal amplitude variation produce corresponding current variations through said element and regulate the damping of said tunable circuit.
2, In a signal receiving system, a tube having input and output electrodes, a tunable signal cir- 5 cuit connected between the input electrodes, a signal output network coupled to the output electrodes, a signal detector having a signal input circuit and an audio output circuit, an element having a non-linear resistance characteristic connected in circuit in said tunable circuit, said element being of the iron-hydrogen type, and said element being included in the detector space current circuit whereby variations in the detector space current caused by signal amplitude variation produce corresponding current variations through said element and regulate the damping of said tunable circuit.
3. In a signal receiving system, a tube having input and output electrodes, a tunable signal circuit connected between the input electrodes, a signal output network coupled to the output electrodes, a signal detector having a signal input circuit and an audio output circuit, an element having a non-linear resistance characteristic connected in series circuit in said tunable circuit, and said element being included in the detector space current circuit whereby variations in the detector space current caused by signal amplitude variation produce corresponding current variations through said element and regulate the damping of said tunable circuit.
ERICH ZEPLER.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2171638X | 1935-02-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2171638A true US2171638A (en) | 1939-09-05 |
Family
ID=7988451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US62248A Expired - Lifetime US2171638A (en) | 1935-02-11 | 1936-02-04 | Automatic volume control |
Country Status (1)
Country | Link |
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US (1) | US2171638A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2417844A (en) * | 1942-06-05 | 1947-03-25 | Int Standard Electric Corp | Radio receiver |
US2432033A (en) * | 1944-10-04 | 1947-12-02 | Colonial Radio Corp | Compensation for battery voltage changes in radio receivers |
-
1936
- 1936-02-04 US US62248A patent/US2171638A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2417844A (en) * | 1942-06-05 | 1947-03-25 | Int Standard Electric Corp | Radio receiver |
US2432033A (en) * | 1944-10-04 | 1947-12-02 | Colonial Radio Corp | Compensation for battery voltage changes in radio receivers |
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