DE700379C - Arrangement for receiving multiple messages - Google Patents
Arrangement for receiving multiple messagesInfo
- Publication number
- DE700379C DE700379C DE1938T0049901 DET0049901D DE700379C DE 700379 C DE700379 C DE 700379C DE 1938T0049901 DE1938T0049901 DE 1938T0049901 DE T0049901 D DET0049901 D DE T0049901D DE 700379 C DE700379 C DE 700379C
- Authority
- DE
- Germany
- Prior art keywords
- frequency
- subcarriers
- arrangement
- main carrier
- receiving multiple
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Description
Anordnung zum Empfang mehrerer Nachrichten Zur Mehrfachaüsnutzung einer übertragungsanlage ist es bekannt, eine kurze oder ultrakurze Trägerwelle mit einer Reihe von sogenannten Zwischenträgerwellen zu modulieren, die ihrerseits wiederum Träger der zu übermittelnden Nachrichten sind. Um eine gegenseitige Störung der einzelnen Zwischenträgerwellen zu verhindern, ist es bekannt, die Zwischenträgerwellen ergebenden Modulationsfrequenzen der ultrakurzen Trägerwelle aus einer gemeinsamen Grundfrequenz, z. B. durch Vervielfachung dieser Grundfrequenz, abzuleiten. Es ist dann in bekannter Weise möglich, empfängerseitig mit einem einzigen überlagerer zu arbeiten, der die einzelnen Zwischenträgerfrequenzen in verschiedene -Zwischenfrequenzen umwandelt, die dann in normaler Weise getrennt demoduliert werden können. Bei dieser Anordnung besteht jedoch noch die Möglichkeit, daß noch vorhandene Frequenzschwankungen der ganzen Gruppe von Zwischenträgerwellen dazu führen, daß die aus diesen Zwischenträgerwellen resultierenden empfängerseitigen Zwischenfrequenzen aus den Durchlaßbereichen der den Zwischenfrequenzen zugeordneten, fest abgestimmten Zwischenfrequenzverstärker herausfallen. Um diesen Nachteil zu vermeiden, wird empfängerseitig der Einfluß von Frequenzschwankungen der Zwischenträger dadurch ausgeglichen, daß eine für sämtliche Zwischenträger gemeinsam wirkende automatische Scharfabstimmungsanordnung vorgesehen ist, durch die die Frequenz des Überlagerers beeinflußt wird. Der besondere Vorteil hiervon liegt darin, daß infolge des konstanten Frequenzabstandes der einzelnen Zwischenträger eine einzige Scharfabstimmungseinrichtung genügt, wodurch eine erhebliche Vereinfachung der ganzen übertragungsanlage erzielt wird.Arrangement for receiving several messages for multiple use a transmission system is known to be a short or ultra-short carrier wave modulate with a series of so-called subcarrier waves, which in turn in turn are carriers of the messages to be transmitted. To a mutual disturbance To prevent the individual intermediate carrier shafts, it is known that the intermediate carrier shafts resulting modulation frequencies of the ultra-short carrier wave from a common Base frequency, e.g. B. by multiplying this basic frequency to derive. It is then possible in a known manner, on the receiver side with a single superimposed to work, which converts the individual subcarrier frequencies into different intermediate frequencies which can then be demodulated separately in a normal manner. At this However, there is still the possibility that frequency fluctuations still exist the whole group of intermediate carrier shafts lead to the fact that from these intermediate carrier shafts resulting intermediate frequencies at the receiver end from the passbands of the Fixedly tuned intermediate frequency amplifier assigned to the intermediate frequencies fall out. In order to avoid this disadvantage, the influence on the receiver side compensated for by frequency fluctuations of the subcarriers that one for all Intermediate carriers jointly acting automatic focussing arrangement provided by which the frequency of the superimposed is influenced. The special advantage of this lies in the fact that due to the constant frequency spacing of the individual Subcarrier a single sharpener enough, whereby a considerable simplification of the entire transmission system is achieved.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1938T0049901 DE700379C (en) | 1938-02-05 | 1938-02-05 | Arrangement for receiving multiple messages |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1938T0049901 DE700379C (en) | 1938-02-05 | 1938-02-05 | Arrangement for receiving multiple messages |
Publications (1)
Publication Number | Publication Date |
---|---|
DE700379C true DE700379C (en) | 1940-12-19 |
Family
ID=7563253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1938T0049901 Expired DE700379C (en) | 1938-02-05 | 1938-02-05 | Arrangement for receiving multiple messages |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE700379C (en) |
-
1938
- 1938-02-05 DE DE1938T0049901 patent/DE700379C/en not_active Expired
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