US1856376A - Radio-communication system - Google Patents

Radio-communication system Download PDF

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Publication number
US1856376A
US1856376A US350593A US35059329A US1856376A US 1856376 A US1856376 A US 1856376A US 350593 A US350593 A US 350593A US 35059329 A US35059329 A US 35059329A US 1856376 A US1856376 A US 1856376A
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United States
Prior art keywords
record
appear
messages
records
message
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Expired - Lifetime
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US350593A
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English (en)
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Saivre Maurice De
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception

Definitions

  • the effects of parasites and fading, in deforming the transmitted message are both eliminated. This is done, broadly speaking, by transmitting the message upon two different systems, one eliminating errors due to parasites while possibly leaving some errors due to fading, and the other eliminating errors due to fading, while possibly leaving some A nal corrected record is then made, in which these remaining errors, if any, are removed.
  • the invention is practiced, as to one step thereof, by transmitting the message several times, by the normal method of sending the signals, such as dots and dashes, as impulses, separated by paces.
  • the repeated message is received, and all positive Signs or indications, which appear l, upon less than all of the received versions,
  • the same message is also transmitted several times by the method known as counter-manipulation,
  • the object of the invention is the provision of an improved method of the ⁇ character above described.
  • Fig. l shows diagrammatically an arrangement of transmitting and receiving stations.
  • Fig. 2 shows diagrammatically the various stages in the reception of a word, according to one method of applying the invention.
  • two transmitting stations A1 and A2 and two receiving stations B1 and B2 may be employed.
  • a message is transmitted on a short wave-length by counter manipulation methods between A1 and B1, two or three times in succession.
  • the successive messages are recorded at the receiving station and the additional signs, due to fading, are automatically eliminatedby combining the records obtained by the delayed repetitions of the signals.
  • the message is also transmitted on a lon-g ⁇ wave-length between the stations A2 and B2 by ordinary methods, the message again beingrepeated two or three times.
  • the successive messages are recorded at the receiving station and the additional signs, due to parasites, are again vautomatically eliminated.
  • the transmissions between A1 and B1 and A2 and B2 may be made either simultaneously or one after the other.
  • the record obtained at B1 After the record obtained at B1 has been reversed, it is compared with the non-reversed record obtained at B2.
  • the former record presents a certain number of blanks dueto parasites, whilstthe latter has a number of blanks due to fading.
  • These blanks may be eliminated by a local retransmission of the two messages or by impressing the two messages in parallel on a receiving appara- V tus T. Under these conditions a sign need 4lost at b owing to fading.
  • Fig. 2 The method of comparing records obtained in the manner described, is illustrated in Fig. 2.
  • l shows the original message transmitted by the system of direct manipulation.
  • Two records obtained on this system are shown at 2 and 3.
  • record 2 a parasite occurred at a and a signal was In record 3 a parasite'occurred 'atc and thus transformed .the .E into T.
  • the signals a and c since they do not occur in both records, Vare ignored and. the correct version is obtained for thelet'ters F R N C E.
  • the fading at I) in record V2 removes this signal from .one of the records and the corresponding signal in record 3 is ignored although it is a correct one.
  • the record 4 is obtained from a combination of records 2 and 3 and the resulting word is F R T N C E.
  • the counter-manipulation need not necessarily involve an additional operation. It may be operated on the same lines' as the direct manipulation. In this case the ylatter would beeected by a normal current during intervals with an additional worln'ng current during the signalling periods, as is usual in rapid line telegraphy. The two currents would then start from the same relay, the working current being directed towards the station A1 and the normal current towards the station A2.
  • This arrangement has the advantage of avoiding any interference between the two 5 frequencies, as they are not emitted simultaneously.
  • Another modiication of the invention consists in using a single station functioning on a single wave-length only.
  • the initial transmission, followed by a repetition is effected by ordinary manipulation, and two further repetitions are made by' counter-manipulation.
  • the two messages transmitted by ordinary manipulation are received by the different sectors of a telegraphic apparatus which eliminates the additional signs due to para sites, by means of recording relays fed in series, and the two other messages transmitted in counter-manipulation are received by the sectors of second telegraphic apparatus which, after the messages have been reversed, eliminates in a similar way the additional signs due to fading.
  • Both the 25 resulting messages are free from additional signs, but there may be additional blanks which are eliminated, as previously described, during their simultaneous translation, the corresponding relays being fed in parallel instead of in series as when the messages are originally recorded.
  • the number and nature of the repetitions may be modified according to the atmospheric conditions. If, for example, there are no. parasites but a very pronounced fading, which is of a frequent occurrence in short-wave transmissions, the transmission in normal manipulation may be entirely suppressed, but the num- 40 ber of counter-manipulation repetitions, on
  • the method of eliminating the deformation of signals to be recorded which consists in transmitting a message several times, first by the normal method of sending the signals as impulses, separated by spaces, on a long wave-length, and secondly, in inverted form, by transmitting the spaces between the signals as impulses, ony a short Wave-length; receiving and making a corrected record of the first series by removing all positive indications which appear on less than all of the received messages; receiving, and making a corrected record of the second series, in re-inverted form, so that the signals will appear as positive indications, by removing all indications which appear on less than all the received messages, which would be blanks on the messages received in inverted form, or positive indications on the same messages if re-inverted; and making a final corrected record from the two corrected records thus made, by inserting in the final record all positive indications which appear on either of said two corrected records.
  • the method of eliminating the deformation of signals to be recorded which consists in transmitting a message several times, irst by the normal method of sending the signals as impulses, separated by spaces, on one wave-length and secondly, in inverted form, by transmitting the spaces between the signals as impulses, on a different wave-length receiving and making a corrected record of the first series by removing all positive indications which appear on less than all of the received messages; receiving, and making a corrected record of the second series in re-inverted form, so that the signals will appear as positive indications, by removing all indications which appear on less than all the received messages, which would be blanks on the messages received in inverted form, or positive indications on the same messages if re-inverted; and making a final corrected record from the two correct records ⁇ thus made, by inserting in the final record all positive indications which appear on either of said two corrected records.
  • the method of eliminating the deformation of signals to be recorded which consists in transmitting a mes'- sage several times by the normal method of sending the signals as impulses, separated by spaces, receiving said repeated message and making a corrected record thereof by removing all positive indications which appear on less than all of the received messages; transwww mittingthe saine message, in inverted form*7 several times, bytransinitting the spaces between the signals, as impulses, receiving, and re-inverting the same, so that the signals Will appear as positive indications and making a corrected record of the message by removing all positive indications Which appear on less than allA of the received re-inverted messages and making a inal corrected record from the two corrected records thus made by inserting in the Vfinal record al1 positive indications which appear on either of said two corrected records.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Radio Relay Systems (AREA)
US350593A 1928-04-03 1929-03-28 Radio-communication system Expired - Lifetime US1856376A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR515790X 1928-04-03

Publications (1)

Publication Number Publication Date
US1856376A true US1856376A (en) 1932-05-03

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ID=8914920

Family Applications (1)

Application Number Title Priority Date Filing Date
US350593A Expired - Lifetime US1856376A (en) 1928-04-03 1929-03-28 Radio-communication system

Country Status (4)

Country Link
US (1) US1856376A (fr)
DE (1) DE515790C (fr)
FR (1) FR668570A (fr)
GB (1) GB309022A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2568408A (en) * 1947-05-17 1951-09-18 Rca Corp Frequency shift diversity transmission system
US2803006A (en) * 1946-03-11 1957-08-13 William J Jacobi Radio system for relaying information signals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE471813A (fr) * 1946-03-12

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803006A (en) * 1946-03-11 1957-08-13 William J Jacobi Radio system for relaying information signals
US2568408A (en) * 1947-05-17 1951-09-18 Rca Corp Frequency shift diversity transmission system

Also Published As

Publication number Publication date
DE515790C (de) 1931-02-07
FR668570A (fr) 1929-11-04
GB309022A (en) 1930-02-20

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