DE575775C - Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy - Google Patents

Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy

Info

Publication number
DE575775C
DE575775C DES79941D DES0079941D DE575775C DE 575775 C DE575775 C DE 575775C DE S79941 D DES79941 D DE S79941D DE S0079941 D DES0079941 D DE S0079941D DE 575775 C DE575775 C DE 575775C
Authority
DE
Germany
Prior art keywords
currents
efficiency
transmission systems
automatic control
transmission
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
DES79941D
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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
Priority to BE347639D priority Critical patent/BE347639A/fr
Priority claimed from DES79330D external-priority patent/DE540615C/en
Application filed by Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Priority to DES79941D priority patent/DE575775C/en
Priority to DES79974D priority patent/DE569789C/en
Priority to DES81447D priority patent/DE543574C/en
Priority to DES82111D priority patent/DE544096C/en
Priority to GB1038928A priority patent/GB289050A/en
Priority to GB1056928A priority patent/GB291048A/en
Application granted granted Critical
Publication of DE575775C publication Critical patent/DE575775C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Optical Communication System (AREA)
  • Transmitters (AREA)
  • Radio Relay Systems (AREA)

Description

Einrichtung zur selbsttätigen Regelung des Wirkungsgrades von Übertragungssystemen, insbesondere für Bildtelegraphie Im Hauptpatent wird eine Einrichtung zur selbsttätigen Regelung des Wirkungsgrades von Übertragungssystemen beschrieben, bei der einem Trägerstrom außer den zu übertragenden Nutzströmen, z. B. Sprechströmen in der drahtlosen Telephonie, noch ein Hilfsstrom konstanter Sendeamplitude aufgedrückt wird, dessen Frequenz außerhalb des Frequenzbandes der Nutzströme liegt.Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy In the main patent a device for automatic Control of the efficiency of transmission systems described in the one Carrier stream besides the useful streams to be transmitted, e.g. B. Streams of speech in the wireless Telephony, an auxiliary stream of constant transmission amplitude is also impressed, of which Frequency lies outside the frequency band of the useful currents.

Die Erfindung betrifft eine Verbesserung dieser Einrichtung, und zwar bei solchen Übertragungssystemen, die mit Synchronismus an der Sende- und Empfangsstelle arbeiten und zu diesem Zwecke außer den Nachrichtenströmen Synchronisierungsströme über den Übertragungsweg senden. Insbesondere kommen hierfür Übertragungssysteme für Bildtelegraphie, Fernsehen sowie für Tonfilme in Betracht. Die Erfindung besteht darin, daß die Synchronisierströme, die außerhalb des Frequenzbandes der Nutzströme liegen, gleichzeitig als Steuerströme mit konstanter Sendeamplitude dienen und demzufolge auf der Empfangsseite die von den ausgesiebten Steuerströmen in Wirkung gesetzte Relaisvorrichtung nur von den Strömen dieser Frequenz durchflossen wird. Es ist dazu notwendig, die Synchronisierstromquelle auf der Sendeseite so auszubilden, daß sie eine konstante Amplitude liefert.The invention relates to an improvement in this device, namely in such transmission systems that use synchronism at the sending and receiving points work and for this purpose, in addition to the message streams, synchronization streams send via the transmission path. In particular, transmission systems are used for this for telegraphy, television and sound films. The invention exists in that the synchronizing currents that are outside the frequency band of the useful currents lie, at the same time serve as control currents with constant transmission amplitude and consequently on the receiving side the one put into effect by the sifted out control currents Relay device is only traversed by the currents of this frequency. It is necessary to design the synchronizing power source on the transmitting side in such a way that that it provides a constant amplitude.

Die Zeichnung zeigt ein Ausführungsbeispiel der Erfindung, und zwar in Anwendung auf ein Übertragungssystem für Bildströme. A ist die Sendestelle, B die Empfangsstelle, beide schematisch gezeichnet. Auf der Sendeseite treibt ein Motor ist die Sendetrommel t an; w ist eine Vorrichtung, die die Lichtschwankungen des zu übertragenden.Bildes in Schwankungen eines elektrischen Stromes umsetzt, g ist eine mit dem Motor m verbundene Synchronisierungsvorrichtung irgendeiner bekannten Art, die Synrhr onisierungsströme nach der Empfangsstelle schickt. Die von g ausgehenden Ströme dienen gleichzeitig als Steuerströme konstanter Sendeamplitude, die im Empfänger die Empfangsstärke der Nutzströme konstant halten. In der Sendeanordnung s werden Bild- und Synchronisierungs- bzw. Steuerströme einem hochfrequenten Trägerstrom aufgedrückt und gelangen über die Sendeantenne a drahtlos nach der Empfangsantenne e. An die Antenne e schließt sich ein Gleichrichter d an. Aus diesem treten nur noch die Bild- und Synchronisier- b:zw. Steuerströme aus. Durch elektrische Filter werden auch diese beiden Stromarten voneinander getrennt; durch ein Filter n fließen die Bildströme, die z. B. über einen Verstärker v in die Lichtsteuervo:rrichtung l gelangen, deren Lichtschwankungen- auf die Empfangstrommel t2 wirken. Das Filter )z überträgt die Hilfsströme, d. h. die Synchronisier- bzw. Steuerströme, die einerseits. über eine Relaisvorrichtung c nach einem der im Hauptpatent angezogenen Verfahren die übertragung der Bildströme beeinflussen, z. B. am Verstärker v, und die andererseits - als Synchronis.ierströme - den Empfangsmotor yn2 im Gleichlauf mit dem Motor in, halten.The drawing shows an embodiment of the invention applied to a transmission system for image streams. A is the sending point, B the receiving point, both shown schematically. On the transmission side, a motor drives the transmission drum t ; w is a device which converts the light fluctuations of the image to be transmitted into fluctuations in an electric current, g is a synchronization device of any known type connected to the motor m and which sends synchronization currents to the receiving station. The currents emanating from g also serve as control currents of constant transmission amplitude, which keep the reception strength of the useful currents constant in the receiver. In the transmission arrangement s, image and synchronization or control currents are imposed on a high-frequency carrier current and pass wirelessly via the transmission antenna a to the receiving antenna e. A rectifier d is connected to the antenna e. From this only the image and synchronization b: zw. Control currents. These two types of current are also separated from each other by electrical filters; through a filter n flow the image streams z. B. reach via an amplifier v in the light control servo: rrichtung l , whose light fluctuations act on the receiving drum t2. The filter) z transmits the auxiliary currents, ie the synchronizing or control currents, on the one hand. affect the transmission of the image streams via a relay device c according to one of the methods referred to in the main patent, z. B. at the amplifier v, and on the other hand - as synchronizing currents - keep the receiving motor yn2 in synchronism with the motor.

Claims (1)

PATENTANSPRUCH: Einrichtung zur selbsttätigen Regelung des Wirkungsgrades von Übertragungssystemen, bei denen außer den Nachrichtenströmen noch Synchronisierungsströme übertragen werden, insbesondere für Bildtelegraphie, dadurch gekennzeichnet, daß die Synchronisierungsströme als Steuerströme zur Konstanthaltung des Übertragungswirkungsgrades dienen.PATENT CLAIM: Device for automatic control of the degree of efficiency of transmission systems in which, in addition to the message streams, synchronization streams are transmitted, in particular for video telegraphy, characterized in that the synchronization currents as control currents to keep the transmission efficiency constant to serve.
DES79941D 1927-04-21 1927-05-25 Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy Expired DE575775C (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE347639D BE347639A (en) 1927-04-21
DES79941D DE575775C (en) 1927-04-21 1927-05-25 Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy
DES79974D DE569789C (en) 1927-04-21 1927-05-28 Device for automatic control of the efficiency of transmission systems
DES81447D DE543574C (en) 1927-04-21 1927-08-31 Process for the automatic regulation of the efficiency of transmission systems
DES82111D DE544096C (en) 1927-04-21 1927-10-08 Process for the automatic regulation of the efficiency of transmission systems
GB1038928A GB289050A (en) 1927-04-21 1928-04-05 An arrangement for the automatic control of the efficiency of transmitting systems, particularly for high frequency transmitting systems
GB1056928A GB291048A (en) 1927-04-21 1928-04-10 Arrangement for the automatic regulation of the efficiency of transmission systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DES79330D DE540615C (en) 1927-04-21 1927-04-21 Process for the automatic regulation of the efficiency of transmission systems, especially for wireless telephony
DES79941D DE575775C (en) 1927-04-21 1927-05-25 Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy

Publications (1)

Publication Number Publication Date
DE575775C true DE575775C (en) 1933-05-03

Family

ID=25996859

Family Applications (1)

Application Number Title Priority Date Filing Date
DES79941D Expired DE575775C (en) 1927-04-21 1927-05-25 Device for automatic control of the efficiency of transmission systems, especially for picture telegraphy

Country Status (2)

Country Link
DE (1) DE575775C (en)
GB (2) GB289050A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE872969C (en) * 1951-01-13 1953-04-09 Siemens Ag Method for reducing fading in wireless single sideband transmissions
DE767750C (en) * 1933-02-28 1953-07-06 Rca Corp Circuit arrangement for re-introducing the average image brightness in television receivers with a Braunschweig tube
DE752761C (en) * 1935-11-02 1954-02-08 Telefunken Gmbh Method for regulating the output amplitude of the amplifier for the reception of television broadcasts
DE973139C (en) * 1946-04-30 1959-12-10 Rank Cintel Ltd Method for the transmission of monitoring signals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767750C (en) * 1933-02-28 1953-07-06 Rca Corp Circuit arrangement for re-introducing the average image brightness in television receivers with a Braunschweig tube
DE752761C (en) * 1935-11-02 1954-02-08 Telefunken Gmbh Method for regulating the output amplitude of the amplifier for the reception of television broadcasts
DE973139C (en) * 1946-04-30 1959-12-10 Rank Cintel Ltd Method for the transmission of monitoring signals
DE872969C (en) * 1951-01-13 1953-04-09 Siemens Ag Method for reducing fading in wireless single sideband transmissions

Also Published As

Publication number Publication date
GB289050A (en) 1928-12-06
GB291048A (en) 1929-05-17

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