DE736917C - High pass chain ladder for wire radio systems - Google Patents

High pass chain ladder for wire radio systems

Info

Publication number
DE736917C
DE736917C DEI52765D DEI0052765D DE736917C DE 736917 C DE736917 C DE 736917C DE I52765 D DEI52765 D DE I52765D DE I0052765 D DEI0052765 D DE I0052765D DE 736917 C DE736917 C DE 736917C
Authority
DE
Germany
Prior art keywords
radio systems
wire radio
high pass
frequency
pass chain
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
Application number
DEI52765D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Priority to DEI52765D priority Critical patent/DE736917C/en
Application granted granted Critical
Publication of DE736917C publication Critical patent/DE736917C/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04HBROADCAST COMMUNICATION
    • H04H20/00Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65Arrangements characterised by transmission systems for broadcast
    • H04H20/76Wired systems
    • H04H20/77Wired systems using carrier waves
    • H04H20/81Wired systems using carrier waves combined with telephone network over which the broadcast is continuously available

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Description

Hochpaßkettenleiter für Drahtfunkanlagen Bei Drahtfunkanlagen mit hochfrequenten Trägerwellen werden zur Trennung der niederfrequenten Fernsprechströme von den hochfrequenten Drahtfunkströmen sog. Teilnehmerweichen benutzt. Diese haben also die Aufgabe, die hochfrequenten Drahtfunkströme vom Fernsprechapparat und umgekehrt die niederfrequenten Fernsprechströme vom Drahtfunkempfänger fernzuhalten.High-pass chain conductor for wire radio systems With wire radio systems with High frequency carrier waves are used to separate the low frequency telephone currents so-called subscriber switches are used by the high-frequency wire radio currents. Have this So the task, the high-frequency wire radio currents from the telephone and vice versa Keep the low-frequency telephone currents away from the wireless receiver.

Solche Weichen verursachen aber durch ihre Dämpfung eine solche Schwächung der Empfangsenergie, daß bei Verwendung unempfindlicher Drahtfunkempfänger Schwierigkeiten auftreten können. Beispielsweise kann eine zu große Filterdämpfung sich bei Verwendung eines Volksempfängers als Drahtfunkempfänger äußerst störend auswirken.Such switches cause such a weakening due to their damping the received energy that difficulties are encountered when using insensitive wire radio receivers may occur. For example, if the filter attenuation is too great, this can result of a people's receiver as a wire radio receiver are extremely disruptive.

Gegenstand der Erfindung ist nun ein Hochpaßkettenleiter, der für die angegebenen Verhältnisse eine erhebliche Verbesserung der Übertragungsgüte bedeutet. Seine Dämpfungsfrequenzkurve besitzt im Durchlaßbereich den bei einfachen und billigen Hochpaßkettenleitern bekannten, stark ausgeprägten wellenförmigen Verlauf. Das wesentliche Merkmal des Kettenleiters gemäß vorliegender Erfindung besteht hierbei darin, daß seine Elemente bei vorgegebenen Trägerfrequenzen so bemessen sind, daß die Stellen geringster Dämpfung mit den Trägerfrequenzen zusammenfallen.The invention is now a high-pass chain conductor for the specified ratios mean a considerable improvement in the transmission quality. Its attenuation frequency curve has in the pass band that of simple and cheap ones High-pass chain ladders well-known, strongly pronounced undulating course. The essentials The feature of the chain conductor according to the present invention is that its elements are dimensioned at predetermined carrier frequencies so that the places lowest attenuation coincide with the carrier frequencies.

Die Formeln, nach denen Bandfilter berechnet werden können, sind bekannt. Auch kann man innerhalb gewisser Grenzen den Kurvenverlauf durch praktischen Versuch in einem gewünschten Sinne beeinflussen. Man hat es daher in der Hand, für ein vorgegebenes System mehrerer Trägerfrequenzen das Filter so zu bemessen, daß seine Dämpfung sich nicht mehr in dem bisherigen Maße störend auswirkt. Es ist allerdings zu erwähnen,- daß bei sehr guten Filtern die Wellen des Durchlaßbereiches nur sehr wenig ausgeprägt sind, so daß die durch Anwendung des Erfindungsgedankens erzielbaren Vorteile nicht sehr-ins Gewicht fallen. Bei billigen Filtern aber, deren Verwendung bisher den Empfang stark beeinträchtigte, kann man durch den angegebenen einfachen Kunstgriff eine wesentliche Verbesserung bewirken. Die Erfindung verschafft daher die Möglichkeit, mit sehr einfachen und billigen Mitteln gute Übertragungsverhältnisse zu erzielen, so daß man einerseits auf die Verwendung teurer Filter verzichten und trotzdem andererseits auch mit unempfindlichen Empfangsgeräten, wie beispielsweise mit Volksempfängern, in zufriedenstellenderWeise Drahtfunksendungen empfangen kann.The formulas according to which band filters can be calculated are known. You can also, within certain limits, the course of the curve by practical experiment influence in a desired sense. So you have it in your hand, for a given one System of several carrier frequencies to dimension the filter so that its attenuation is no longer has a disruptive effect to the previous extent. It is to be mentioned, however, that with very good filters the waves of the pass band are very little pronounced are, so that the advantages that can be achieved by applying the inventive concept are not very weighty. In the case of cheap filters, however, their use has so far been the Badly impaired reception can be remedied by the simple trick given cause a significant improvement. The invention therefore makes it possible to to achieve good transmission ratios with very simple and cheap means, so that on the one hand you can forego the use of expensive filters and still on the other hand also with insensitive receivers, such as people's receivers, receive wire broadcasts in a satisfactory manner.

Claims (1)

PATENTANSPRUCH: Hochpaßkettenleiter für Drahtfunkanlagen zur Trennung der hochfrequenten Trägerwellen von den auf der gleichen Leitung laufenden niederfrequenten Sprechströmen, bei dem die Dämpfungsfrequenzkurve im Durchlaßbereich einen stark ausgeprägten wellenförmigen Verlauf hat, dadurch gekennzeichnet, daß die Elemente des Kettenleiters bei vorgegebenen `Trägerfrequenzen so bemessen sind, daß die Stellen geringster Dämpfung mit den Trägerfrequenzen zusammenfallen. PATENT CLAIM: High-pass chain conductor for wire radio systems for separating the high-frequency carrier waves from the low-frequency speech currents running on the same line, in which the attenuation frequency curve in the pass band has a pronounced undulating course, characterized in that the elements of the chain conductor are dimensioned at given carrier frequencies so that the points of least attenuation coincide with the carrier frequencies.
DEI52765D 1935-07-11 1935-07-11 High pass chain ladder for wire radio systems Expired DE736917C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI52765D DE736917C (en) 1935-07-11 1935-07-11 High pass chain ladder for wire radio systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEI52765D DE736917C (en) 1935-07-11 1935-07-11 High pass chain ladder for wire radio systems

Publications (1)

Publication Number Publication Date
DE736917C true DE736917C (en) 1943-07-01

Family

ID=7193430

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI52765D Expired DE736917C (en) 1935-07-11 1935-07-11 High pass chain ladder for wire radio systems

Country Status (1)

Country Link
DE (1) DE736917C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE932912C (en) * 1944-01-23 1955-09-12 Siemens Ag Circuit arrangement for equalization of the distortions caused by the filters in carrier-frequency communication systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE932912C (en) * 1944-01-23 1955-09-12 Siemens Ag Circuit arrangement for equalization of the distortions caused by the filters in carrier-frequency communication systems

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