US1798415A - Simultaneous wireless broadcasting - Google Patents

Simultaneous wireless broadcasting Download PDF

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Publication number
US1798415A
US1798415A US374677A US37467729A US1798415A US 1798415 A US1798415 A US 1798415A US 374677 A US374677 A US 374677A US 37467729 A US37467729 A US 37467729A US 1798415 A US1798415 A US 1798415A
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US
United States
Prior art keywords
zones
news
waves
sending
station
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 - Lifetime
Application number
US374677A
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English (en)
Inventor
Hahnemann Walter
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz 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
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US1798415A publication Critical patent/US1798415A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the method and device according to this invention avoids these drawbacks an it will broadcast from a central sending station one and the same news on diiierent wave lengths selected in such a manner that the sum of their zones of incidence will cover the total area to be supplied with the news.
  • Figure 1 illustrates diagrammatically the distribution of energy of the different waves in dependency on the distance from the sending station.
  • Figure 2 shows the distribution of news by means of dilferent waves, whose zones of incidence are so chosen that the total area concerned is covered, and
  • Figure 3 shows the arrangement of a sending apparatus for carrying out the method of broadcasting according to the invention.
  • the receiving intensity of a sending apparatus working on the wave-length 1 is represented as a function of the distance of the receiving station from the sending station, for instance only one quarter of the total area will be furnished with sutllcient receiving energy.
  • l-iccording to the invention now three additional sending apparatus, whos wave-length is so chosen that the zones of the most favorable reception are located adjacent each other, are arranged at the central sending station.
  • the receiving intensity of the individual sending apparatus is shown in the curves 5 tool of Figure 1 in correspondence with their different wave-lengths 24. If these four intensity curves are added it follows a uniform power of sound in the receiver for the total area to be covered. As the zones of incidence of the waves very accurately depend on the wavelength the illustrated distribution of intensity can be easily and accurately maintained.
  • the idea of the invention is again represented with respect to Figure 2 in order to clearly show the interlocking of the various zones.
  • the sending station is designated by S while the different receiving zones are marked by different hatching.
  • the arrangement of sending apparatus shown in Figure 3 diagrammaticall - may be used.
  • Four aerial wires of the sending station are supplied through a sending apparatus 5, 6, 7, 8, which are actuated in common by a microphone 9.
  • the aerial wire 1 will emit the wave A 1, the aerial 2 the wave A 2 and so on.
  • the circuits of modulation for all four sending apparatus are connected in parallel by means of the wires 10 and 11, upon which is forced in common the modulation by means of the microphone and the interposition of an intensifying valve 12.
  • the latter is equipped with an input transformer 13 while the output transformer 14 is of any desired design.
  • the transmission apparatus 5'to'8 may be of any desired design, for the subject matter of invention it is only material to actuate all transmitting apparatus in unison, since all zones are to receive the same news.
  • a change of the wave length is offected each time according to respective daytime or there are arranged a few more sending apparatus at the central transmitting station respectively in order to supply all zones properly.
  • the first zone will'be displaced at a greater dis tance from the transmitting station than in daytime. For that reason it will become necessary to connect a 'few more transmitting apparatus at night, which will cover also the larger space formed between the transmitting station and the receiving zone in a corresponding manner.
  • the latter might be supplied to a smaller or bigger audience, in that the number of the transmission waves is changed.
  • the connection of the various aerial wires for transmission is effected by means of the connecting switches for the aerial wires designated 15, 16, 17, 18.
  • the location of the Zone will not only depend on the wave length but also on the 7 angle of radiation at the transmitting station, it is further suggested, to alter it by means of suitable combinations of aerial Wires, admitting of different directing efiects in order to obtain an accurate observance of the individual zones. It will also be possible to compensate the difference in the radius of action in accordance with the time of the day by a corresponding change of the angle of radiation.
  • Arrangement for the simultaneous distribution of news throughout a given area by wireless broadcasting comprising in combi nation a central transmitting station having a plurality of transmitters for simultaneously transmitting the same news by means of short waves of different frequencies, said waves be ing so chosen that the sum of their zones of incidence will complementarily cover the total area to be supplied by such news.
  • Arrangement for simultaneous distribution of news throughout a given area by wirelessbroadcasting comprising in combination a transmitting station embodying a plurality of transmitters, each including an antenna, for transmitting simultaneously the same news by means of short waves of difierent frequencies so chosenthat the sum of their zones of. incidence will complementarily cover the total'area to be supplied with said news, and means for selectively connecting each receiver with or disconnecting it from its antenna for varying the number of waves to be transmitted at a given time to vary the proportional distribution during different hours of the day and night; 7
  • the method of reliable wireless transmission of news matter throughout a given area by the use of short Wavesof different 1 frequencies which comprises so selecting the use of short waves-of different frequencies which consists in so selecting the frequencies that the sum'of their zones of incidence will complementally cover the total area to be supplied by such news matter, transmitting such news matter from said central transmitting station simultaneously by means of short waves of different frequencies so selected, and varying the number of carrier waves transmitted in such manner as toeflect a substantially uniform distribution of the waves over the given area at different hours of the day and night.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
US374677A 1928-06-09 1929-06-29 Simultaneous wireless broadcasting Expired - Lifetime US1798415A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE313176X 1928-06-09

Publications (1)

Publication Number Publication Date
US1798415A true US1798415A (en) 1931-03-31

Family

ID=6139096

Family Applications (1)

Application Number Title Priority Date Filing Date
US374677A Expired - Lifetime US1798415A (en) 1928-06-09 1929-06-29 Simultaneous wireless broadcasting

Country Status (4)

Country Link
US (1) US1798415A (xx)
FR (1) FR676368A (xx)
GB (1) GB313176A (xx)
NL (1) NL28735C (xx)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091623B (de) * 1956-08-24 1960-10-27 Siemens Ag Nachrichtenuebertragungssystem
US5303259A (en) * 1991-11-07 1994-04-12 Loveall Peter S Frequency-hopped electronic signal transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2177875A (en) * 1985-07-08 1987-01-28 Philips Electronic Associated Radio transmission system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091623B (de) * 1956-08-24 1960-10-27 Siemens Ag Nachrichtenuebertragungssystem
US5303259A (en) * 1991-11-07 1994-04-12 Loveall Peter S Frequency-hopped electronic signal transmitter

Also Published As

Publication number Publication date
GB313176A (en) 1930-05-01
FR676368A (fr) 1930-02-21
NL28735C (xx) 1900-01-01

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