DE685672C - Method for amplitude modulation without significant secondary frequency modulation of a self-excited tube transmitter for recording physical processes - Google Patents
Method for amplitude modulation without significant secondary frequency modulation of a self-excited tube transmitter for recording physical processesInfo
- Publication number
- DE685672C DE685672C DEM130939D DEM0130939D DE685672C DE 685672 C DE685672 C DE 685672C DE M130939 D DEM130939 D DE M130939D DE M0130939 D DEM0130939 D DE M0130939D DE 685672 C DE685672 C DE 685672C
- Authority
- DE
- Germany
- Prior art keywords
- oscillating
- self
- physical processes
- modulation
- amplitude modulation
- 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
- 238000000034 method Methods 0.000 title claims description 14
- 239000013078 crystal Substances 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/34—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being vacuum tube
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Description
Verfahren zur Amplitudenmodulation ohne wesentliche Frequenznebenmodulation eines selbsterregten Röhrensenders zur Aufnahme physikalischer Vorgänge Gegenstand der Erfindung ist ein `-erfahren zur Aufnähme physikalischer Vorgänge; wie Schall u. dgl.z insbesondere von aperiodischen und gleichförmigen Vorgängen, wie beispielsweise von Drücken und Druckänderungen.Method for amplitude modulation without significant secondary frequency modulation a self-excited tube transmitter for recording physical processes object the invention is a `-erfahren for recording physical processes; like sound and the like, in particular of aperiodic and uniform processes, such as of pressures and pressure changes.
Gemäß der Erfindung wird zur Aufnahme derartiger Vorgänge ein selbsterregter Röhrensender, bei dem die Rückkopplungsspannung in an sich bekannter Weise einem zwischen Gitter und Kathode der Schwingröhre angeordneten Schwingkristall über einen dazu parallel liegenden Schwingungskreis zugeführt wird, unter bekannter Verwendung eines Kondensatormikrophons in Gitterspannungskreisen in der Weise amplitudenmoduliert, daß bei Ausbildung des londensatormikrophons als veränderliches Glied des mit dem Schwingkristall gegebenenfalls über ein Kopplungsglied gekoppelten Schwingungkreises die Eigenfrequenz des Schwingkristalls auf der Flanke der Resonanzkurve dieses Schwingungskreises liegt: Der Erfindungsgegenstand zeigt gegenüber den bekannten Anordnungen den Fortschritt, daß ein Sender mit relativ schwachen physikalischen Vorgängen ohne Verstärkung derselben moduliert werden kann, so daß damit Verzerrungen auf ein Minimum herabgesetzt werden.According to the invention, a self-excited is used to record such processes Tube transmitter, in which the feedback voltage in a known manner between the grid and the cathode of the vibrating tube via a vibrating crystal oscillating circuit lying parallel to it is supplied, with known use of a condenser microphone in grid voltage circuits amplitude modulated in the way, that when training the condenser microphone as a variable member of the with the Oscillating crystal, if necessary via a coupling element coupled oscillation circuit the natural frequency of the oscillating crystal on the flank of the resonance curve of this oscillation circuit lies: The subject of the invention shows the progress compared to the known arrangements, that a transmitter with relatively weak physical processes without amplification of the same can be modulated so that distortions are reduced to a minimum.
Es sind an sich zwar schon Meßvorrichtungen bekanntgeworden, bei denen physikalische Vorgänge in elektrische auf ein Verstärkerrohr einwirkende Spannungsänderungen umgeformt werden; jedoch betreifen derartige Vorrichtungen keine Sendeschaltungcii und weisen außerdem noch die an sich bekannten .Nachteile der gemischten Modulation auf.There are already known measuring devices in which physical processes in electrical voltage changes acting on an amplifier tube be reshaped; however, such devices do not involve transmitting circuitry cii and also have the disadvantages of mixed modulation, which are known per se on.
Die Erfindung ist in der Zeichnung in einer Ausführungsform beispielsweise dargestellt, und zwar bedeuten i den Oszillator, a den Schwingkristall und- 3 den über ein Kopplungsglied finit dein Schwingkristall gekoppelten Schwingungskreis, dessen veränderlicher Kondensator als Aufnahmeorgan dient.The invention is shown in the drawing in one embodiment, for example shown, namely i mean the oscillator, a the oscillating crystal and - 3 den An oscillating circuit that is finitely coupled to your oscillating crystal via a coupling element, whose variable capacitor serves as a receiving organ.
Wird gemäß der Erfindung das Aufnahmeorgan durch einen physikalischen Vorgang beeinYlußt und damit in seiner Größe ge-, ändert, so gelangen die Schwingungen des Kreises 3 über das Kopplungsglied in den Schwingkristall und erzeugen an diesem, da infolge der gewählten Einstellung der Kristalieigenfrequenz auf die Flanke der Resonanzkurve des Schwingungskreises die störende Frequenznebenmodülation praktisch unterdrückt wird, Schwingungen gleichbleibender Frequenz, deren Amplituden . nach Art des physikalischen Vorganges bei minimalster kapazitiver Beeinflussung des Aufnahmenrgans stark geändert werden.If according to the invention, the receiving organ by a physical If the process is influenced and thus changed in its size, the vibrations arrive of the circle 3 via the coupling element into the oscillating crystal and generate on this, as a result of the selected setting of the crystal natural frequency on the flank of the Resonance curve of the oscillation circuit practically eliminates the disturbing secondary frequency modulation is suppressed, vibrations of constant frequency, their amplitudes. after Type of physical process with minimal capacitive influence on the receiving element to be changed greatly.
Die Erfindung ist nicht nur auf die in der Beschreibung dargelegte Ausführungsform beschränkt, sondern kann je nach den vorliegenden Bedürfnissen unter Beibehaltung des Erfindungsgedankens in der einen oder anderen Form ihre zweckmäßige Gestaltung finden.,The invention is not limited to that presented in the description Embodiment limited, but can depending on the present needs under Retention of the inventive idea in one form or another its expedient Find design.,
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM130939D DE685672C (en) | 1935-05-07 | 1935-05-07 | Method for amplitude modulation without significant secondary frequency modulation of a self-excited tube transmitter for recording physical processes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM130939D DE685672C (en) | 1935-05-07 | 1935-05-07 | Method for amplitude modulation without significant secondary frequency modulation of a self-excited tube transmitter for recording physical processes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE685672C true DE685672C (en) | 1939-12-22 |
Family
ID=7332125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEM130939D Expired DE685672C (en) | 1935-05-07 | 1935-05-07 | Method for amplitude modulation without significant secondary frequency modulation of a self-excited tube transmitter for recording physical processes |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE685672C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1048195B (en) * | 1953-07-30 | 1958-12-31 | Kurt Fritze | Device for wireless transmission of one or more values when a state is reached on moving machine or vehicle parts |
-
1935
- 1935-05-07 DE DEM130939D patent/DE685672C/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1048195B (en) * | 1953-07-30 | 1958-12-31 | Kurt Fritze | Device for wireless transmission of one or more values when a state is reached on moving machine or vehicle parts |
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