US2079440A - Communication system - Google Patents

Communication system Download PDF

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Publication number
US2079440A
US2079440A US5768A US576835A US2079440A US 2079440 A US2079440 A US 2079440A US 5768 A US5768 A US 5768A US 576835 A US576835 A US 576835A US 2079440 A US2079440 A US 2079440A
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US
United States
Prior art keywords
character
impulses
impulse
arm
instrumentalities
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
US5768A
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English (en)
Inventor
Clyde J Fitch
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Priority to US5768A priority Critical patent/US2079440A/en
Priority to GB24935/36A priority patent/GB478447A/en
Priority to DE1936I0055963 priority patent/DE700868C/de
Priority to FR812431D priority patent/FR812431A/fr
Application granted granted Critical
Publication of US2079440A publication Critical patent/US2079440A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4902—Pulse width modulation; Pulse position modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/42—Transmitting circuits; Receiving circuits using mechanical distributors

Definitions

  • 'I'his invention relates to communication sys' tems and more particularly to printing telegraph systems and is suitably adaptable to both radio and Wire network transmission.
  • pulses applied to synchronous controlling distributors one method of control being the type using periodic uni-directional impulses for maintaining the synchronous condition thereof.
  • This system permits the controlling segment length of the synchronous distributors to be increased to twice the length used heretofore. It will be obvious to those skilled in the art that the problem of allocating the received signals is simpler in that the margin of operation is greatly icreased. Synchronizing of the rotary apparatus need not be as critical as herebefore, and as will be understood as the description progresses, the rate of transmission of character impulses may be increased proportionately.
  • the revolubly mounted cams are adapted to make and break circuits which may be employed in the transmitting units the purpose of which will be understood as the description progresses.
  • the contact spring blade by virtue of' its attached cam follower roller 3l adapted to engage the cam during its partial revolution, to be urged away from the power roller l0' to open the contacts 32 and close the contacts 33. Since the cam turns exactly one half of a revolution before being arrested, the spring blade 30 returns to its normal position as shown in the drawing by virtue of its own resiliency thereby restoring the contacts to their normal position, that is, contacts 32 closed and contacts 33 open.
  • A represents a printing telegraph unit which may be of the type described or any well known type having a series of character pivoted key bars l'l and adapted to initiate a character impulse when one of the character keys is depressed.
  • the transmitting contacts may be positioned as explained hereinbefore so as to open one set of contacts and close another by the operating cams ll or the contacts may be positioned directly in contact 'with' the keyboard l1 as shown in the figure.
  • a transformer 59 associated with the line cr radio receiver 60 which is adapted to receive theaperiodic bi-directional character pulses and periodic synchronizing pulses transmitted by the transmitter 6
  • the secondary winding of the said transformer has each of its terminals connected to the grids of thermionic tubes 62 and 63.
  • the plates of these tubes are connected to series related primary windings of transformers 64 and 65, the secondaries of which are connected to amplifiers 66 and 61 respectively which in turn are interconnected by common conductor 68 connected to the common conducting segment ring 51 of
  • the separate conductors 69 and 10 from the amplifiers are connected to separate groups of the typewriter solenoids I8; for example, as'shown, the group of solenoids connected to character key bars for A, B, and C are commonly connected to amplifier 66, and the group of solenoids for characters N, O, and P are connected by conductor 10 to amplifier 61.
  • the other terminals of the solenoids I8 are connected to the individual segments 52 lof the distributor 5i, each solenoid in a group as the solenoids for characters A, B, and C are connected to segments 52-I. 2 and 3 respectively; the terminals'of the solenoids I8 of the second group N, O, and P are likewise connected to the separate segments 52-l, 2 and 3, so that two character solenoids are connected to each segment, and the solenoids so connected represent the same characters as are representedby tlie 'duo-connections to the transmitting distributor segments from the contacts 32a associated with the character key bars l1.
  • a power supply supplies the elements of tubes 62 and 63 with the proper potentials, as indicated in the figure so that upon reception of a positive pulse representative of a character tube 63 is energized thereby activating its connected output circuit, namely transformer 64 and amplier 66, similarly a negative pulse causes the energization of tube 62 to activate its connected output circuit, transformer 65 and ampliiier 61.
  • the grid elements of tubes 62 and 63 are biased so that an inappreciable amount of current ow exists in its separate output circuits so that the solenoids I8 connected as described hereinbefore to the amplifiers 66 and 61 are not energized when the rotary brush engages the various segments 52.
  • one of the tubes 62 and 63 Upon reception of a character pulse, one of the tubes 62 and 63 is energized due to the grid swing caused by the incoming pulse, depending on the character of the incoming pulse.
  • the operation of tubes connected in the manner described is well known in the art and further description thereof is not deemed necessary.
  • tube 63 Upon reception of the pulse representations of the character N by the receiver 60, Aand upon energization of the connected transformer 59 by the characteristic pulse, tube 63 is energized to activate transformer 65 and the corresponding amplifier 61 to energize the circuit connected to solenoid N through conductors 'I0 and 15 segment 52
  • means to initiate single impulses of equal time duration but differentiated as to character to represent various characterizations means cooperating therewith to control the initiation of the said impulses at differential times during predetermined time intervals determining the selection of particular characterizations and means to transmit the impulses diierentiated as to time and character representing the selected characterization.
  • means to transmit character impulses of equal time duration having different characteristics including cyclical- 1y operable means for initiating impulses at differential times during predetermined timed intervals representing different characters, and controlling means cooperating therewith to select the character of and timed intervals at which the impulses are initiated in accordance with the various characters to be transmitted, and means adapted to be operated by the transmitted impulses and in accordance with their selection.
  • the said impulses including means controlled by the said periodic impulses of like character and means controlled by; the aperiodic sent different characterizations, each by a single selected impulse, means for transmitting periodic impulses of like character, and means for receiving the said impulses including means controlled by the said periodic impulses of like character and means controlled by the aperiodic impulses of unlike character.
  • a plurality of stations each of said stations having a contnuously operated control device, the operation of each of said control devices being in timed relation with that of the other, means to select impulses of unlike character to represent different characterizations, each by a single selected impulse, means whereby the said selected impulses are transmitted from one of said stations at instants of time governed by the operation of its said control device, and indicating means at another of said stations responsive to the said impulses, said indicating means being governed by the control device associated therewith.
  • a communication system in combination, a signal impulse transmitter, translating units comprising signal transmitting instrumentalities, control devices comprising a plurality of controlling members, a plurality of said instrumentalities associated with each of the said controlling members, energy supply means associated with the said instrumentalities whereby the operation of one thereof selects the character of the signal impulse to be transmitted, and means included in ythe said control devices governing the transmission of said selected signal impulses.
  • a communication system comprising means to transmit signal impulses, including 'a translating unit comprising signal transmitting instrumentalities, a. control device comprising a plurality of controlling members, a plurality of said instrumentalities associated with each of the said controlling members, energy supply means associated with the said instrumentalities whereby the operation of one thereof vselects the character of the signal 'impulse to be transmitted, and means included in the said control device governing the transmission of said selected signal impulses, means to receive the signal impulses, a second translating unit comprising a-plurality of signal receiving instrumentalities, a control device comprising a plurality of controlling memincluded in the last mentioned control device governing the operation of the said selected receiving instrumentality.
  • a translating unit comprising a plurality of operable instrumentalities, means to select signal impulses differing in character upon operation of the selected instrumentalities, means to store the selected signal impulse, and a control device including means governing the transmission of the said selected impulse stored by the said storage means.
  • a communication system comprising means to transmit signal impulses of unlike character, a translating unit comprising a plurality of operable instrumentalities, circuits controlled by said instrumentalities, electrostatic means ineluded in said circuits, whereby the operation of the selected instrumentalities condition the said circuits and electrostatic means for the selection of single signal impulses unlike in character, each impulse indicative of definite representation, and a. control device including means governing the transmission of the selected single impulses.
  • means to receive signal impulses of unlike character comprising a plurality of electrostatic devices of which a predetermined number are responsive to signal impulses of predetermined character and the other electrostatic devices responsive to impulses of different characters, and indicating means capable of performing independent operations, which are controlled by the character of the impulses received.
  • a communication system comprising means to transmit signal impulses, including a sending unit comprising a plurality of operable key instrumentalities, a circuit control device comprising a, plurality of contact members and a ro-f tatable contact arm adapted to engage the said contact members successively, a plurality of circuits connecting a predetermined group of said 6 acreage key instrumentalities to each of the said contact members, energy supply means associated with the said instrumentalities whereby the operation of one selects the character of the signal impulse to be transmitted, the time of transmission controlled by the said rotary contact arm, means to receive the signal impulses, a receiving unit comprising a plurality of printing control instrumentalities, a circuit control device com- 10 prising a plurality of contact members and a rotatable contact arm adapted to engage the last mentioned contact members successively, a plurality of circuits to connect a predetermined group of the said printing control instrumentalities 15 to each of said last mentioned contact members,

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electrotherapy Devices (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Transmitters (AREA)
US5768A 1935-02-09 1935-02-09 Communication system Expired - Lifetime US2079440A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US5768A US2079440A (en) 1935-02-09 1935-02-09 Communication system
GB24935/36A GB478447A (en) 1935-02-09 1936-09-12 Improvements in or relating to communication systems
DE1936I0055963 DE700868C (de) 1935-02-09 1936-09-17 Drucktelegraphenanlage mit synchron arbeitenden Fernschreibern
FR812431D FR812431A (fr) 1935-02-09 1936-09-19 Perfectionnements aux systèmes de communication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5768A US2079440A (en) 1935-02-09 1935-02-09 Communication system

Publications (1)

Publication Number Publication Date
US2079440A true US2079440A (en) 1937-05-04

Family

ID=10219603

Family Applications (1)

Application Number Title Priority Date Filing Date
US5768A Expired - Lifetime US2079440A (en) 1935-02-09 1935-02-09 Communication system

Country Status (4)

Country Link
US (1) US2079440A (fr)
DE (1) DE700868C (fr)
FR (1) FR812431A (fr)
GB (1) GB478447A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434681A (en) * 1943-02-13 1948-01-20 Bell Telephone Labor Inc Remotely controlled electrical calculator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434681A (en) * 1943-02-13 1948-01-20 Bell Telephone Labor Inc Remotely controlled electrical calculator

Also Published As

Publication number Publication date
DE700868C (de) 1941-01-02
FR812431A (fr) 1937-05-10
GB478447A (en) 1938-01-19

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