DE643766C - Receiver with noise elimination - Google Patents
Receiver with noise eliminationInfo
- Publication number
- DE643766C DE643766C DER94948D DER0094948D DE643766C DE 643766 C DE643766 C DE 643766C DE R94948 D DER94948 D DE R94948D DE R0094948 D DER0094948 D DE R0094948D DE 643766 C DE643766 C DE 643766C
- Authority
- DE
- Germany
- Prior art keywords
- cathode
- receiver
- noise elimination
- anode
- 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
Links
- 230000008030 elimination Effects 0.000 title claims description 3
- 238000003379 elimination reaction Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
- H03G3/26—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise, e.g. squelch systems
Landscapes
- Amplifiers (AREA)
Description
'-'- ■ ' ^"—i■ '^ "- i
Zusatz zum jpafiänt 551 988Addition to jpafiänt 551 988
ist in Anspruch genommen.is used.
In dem Hauptpatent ist ein Verfahren zur Krachbeseitigung für Empfänger mit selbsttätiger Schwundregelung beschrieben, bei dem der Empfänger unterhalb eines bestimmten Wertes der Hochfrequenzeingangsamplitude gesperrt wird. Der Empfänger wird also nur dann entsperrt, wenn die Hochfrequenzamplitude einen Grenzwert überschreitet. Auf diese Weise wird erreicht, daß die Störgeräusche und die verzerrte Wiedergabe während des Abstimmens weitgehend vermieden sind.In the main patent is a method for eliminating noise for recipients with automatic Shrinkage control described in which the recipient below a certain Value of the high frequency input amplitude is blocked. So the recipient will only then unlocked when the high frequency amplitude exceeds a limit value. To this Way is achieved that the background noise and the distorted playback during the Voting are largely avoided.
Nach der Erfindung wird in einem Empfänger mit Krachbeseitigung unter Verwendung des Verfahrens nach dem Hauptpatent die zur Entsperrung des Empfängers dienende Spannung vom Katbodenwiderstand einer Röhre abgenommen, deren Anodengleichstrom sich mit der einfallenden Hochfrequenzamplitude ändert.According to the invention is used in a receiver with noise cancellation of the method according to the main patent, the voltage from the cathode resistor used to unlock the receiver removed from a tube whose anode direct current varies with the incident high frequency amplitude changes.
Auf diese Weise wird der Vorteil erzielt, daß keine Kompensationsbatterien erforderlich sind.In this way the advantage is achieved that no compensation batteries are required are.
In den Abbildungen sind zwei Ausführungsbeispiele dargestellt. Two exemplary embodiments are shown in the figures.
In Abb. ι wird die Detektorröhre E sowohl als Demodulator als auch zur Erzeugung der Regelspannung für die Krachbeseitigung benutzt. Die Hochfrequenz kommt von der Anode A der letzten Hochfrequenzverstärkerröhre, wird von der Röhre E gleichgerichtet und verursacht dadurch ein Anwachsen des Anodenstromes, wodurch das Potential der Kathode in positiver Richtung erhöht wird. Diese Änderung wird als Gittervorspannung der ersten Niederfrequenzverstärkerröhre iV zugeführt, die bis zu oder über den Verriegelungspunkt negativ vorgespannt ist. Wenn das Potential der Kathode K des Detektors in positiver Richtung genügend erhöht wird, wird der Niederfrequenzverstärker entriegelt. Durch geeignete Einstellung und Auswahl passender Widerstände und Potentiale bleibt der Empfänger unwirksam mit Ausnahme für Hochfrequenzamplituden über einen bestimmten Wert, der gerade über dem vorhandenen Geräuschpegel liegt.In Fig. Ι the detector tube E is used both as a demodulator and to generate the control voltage for noise elimination. The high frequency comes from the anode A of the last high frequency amplifier tube, is rectified by the tube E and thereby causes an increase in the anode current, whereby the potential of the cathode is increased in the positive direction. This change is fed as a grid bias to the first low frequency amplifier tube iV, which is negatively biased up to or above the locking point. When the potential of the cathode K of the detector is increased sufficiently in the positive direction, the low-frequency amplifier is unlocked. With a suitable setting and selection of suitable resistances and potentials, the receiver remains ineffective with the exception of high-frequency amplitudes above a certain value, which is just above the existing noise level.
Die Schaltung gemäß Abb. 2 ergibt eine stärkere Regelwirkung durch die Einschaltung einer Röhre V, die als Gleichstromverstärker dient. Die Änderung des Kathodenpotentials des Demodulators E betätigt diesen Gleichstromverstärker, der seinerseits die Steuergittervorspannung (Entsperrungsspannung) für den Niederfrequenzverstärker N liefert.The circuit according to Fig. 2 results in a stronger control effect by switching on a tube V, which serves as a direct current amplifier. The change in the cathode potential of the demodulator E actuates this DC amplifier, which in turn supplies the control grid bias (enable voltage) for the low-frequency amplifier N.
Claims (3)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER94948D DE643766C (en) | 1928-12-19 | Receiver with noise elimination | |
DER80134D DE551988C (en) | 1928-12-19 | 1929-12-18 | Method for limiting the amplification of receivers with automatic volume control in the high-frequency amplifier section |
DER84812D DE651371C (en) | 1928-12-19 | 1932-05-03 | Receiver with noise elimination |
DE1934R0091101 DE691720C (en) | 1928-12-19 | 1934-07-27 | Receiver with noise elimination |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER94948D DE643766C (en) | 1928-12-19 | Receiver with noise elimination | |
US551988XA | 1928-12-19 | 1928-12-19 | |
US584239XA | 1930-07-07 | 1930-07-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE643766C true DE643766C (en) | 1937-04-16 |
Family
ID=34713953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DER94948D Expired DE643766C (en) | 1928-12-19 | Receiver with noise elimination |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE643766C (en) |
-
0
- DE DER94948D patent/DE643766C/en not_active Expired
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