[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

GB1089155A - Improvements in or relating to data transmission apparatus - Google Patents

Improvements in or relating to data transmission apparatus

Info

Publication number
GB1089155A
GB1089155A GB2301365A GB2301365A GB1089155A GB 1089155 A GB1089155 A GB 1089155A GB 2301365 A GB2301365 A GB 2301365A GB 2301365 A GB2301365 A GB 2301365A GB 1089155 A GB1089155 A GB 1089155A
Authority
GB
United Kingdom
Prior art keywords
data
bits
clock
frequency
carrier
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
GB2301365A
Inventor
Etienne Gorog
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
Publication of GB1089155A publication Critical patent/GB1089155A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H04L25/4906—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 using binary codes

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Dc Digital Transmission (AREA)

Abstract

1,089,155. Data transmission systems. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 31, 1965, [June 26, 1964], No. 23013/65. Heading H4P. Data is transmitted in groups of bits, and in each group the number of 1 bits in the even positions is equal to the number in the odd positions. In the embodiment described, data in 4-out-of-8 code is transformed to data having the above characteristic, by inverting alternate bits. The input data is fed in to a shift register which is read out to an OR gate under control of a clock. A toggle, controlled by the clock, also feeds the OR gate. The resultant data has the required form and frequency modulates a carrier for transmission. The receiver performs, a complementary function. The frequency spectrum of the modulated signal has maximum amplitude at the carrier frequency and negligible amplitude at the carrier frequency plus or minus half the bit rate.
GB2301365A 1964-06-26 1965-05-31 Improvements in or relating to data transmission apparatus Expired GB1089155A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7422A FR1413909A (en) 1964-06-26 1964-06-26 Improvement in information transmission

Publications (1)

Publication Number Publication Date
GB1089155A true GB1089155A (en) 1967-11-01

Family

ID=8572332

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2301365A Expired GB1089155A (en) 1964-06-26 1965-05-31 Improvements in or relating to data transmission apparatus

Country Status (5)

Country Link
CH (1) CH422874A (en)
DE (1) DE1234777B (en)
FR (1) FR1413909A (en)
GB (1) GB1089155A (en)
SE (1) SE319523B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1504609A (en) * 1966-09-21 1967-12-08 Ibm France Data transmission system

Also Published As

Publication number Publication date
SE319523B (en) 1970-01-19
FR1413909A (en) 1965-10-15
DE1234777B (en) 1967-02-23
CH422874A (en) 1966-10-31

Similar Documents

Publication Publication Date Title
GB1079928A (en) A data transmission system
GB1272975A (en) Communication system with reduced fading sensitivity
GB1507261A (en) Error-detecting data transmission system
GB1278693A (en) Digital pulse transmission system
GB1136882A (en) Pm/am multiplex communication
GB1087860A (en) Improvements in or relating to pulse transmission apparatus
GB1062066A (en) Improvements in and relating to communication systems
GB1079836A (en) Improvements in or relating to binary information transmission systems
GB1250993A (en)
GB1402176A (en) Computer interface coding and decoding apparatus
GB996433A (en) Data transmission systems
GB1212340A (en) Transmission system comprising a transmitter and a receiver for the transmission of information in a prescribed frequency band
GB1146728A (en) Improvements in and relating to binary information transmission systems
ES288607A1 (en) Perfected communication system in key (Machine-translation by Google Translate, not legally binding)
GB1089155A (en) Improvements in or relating to data transmission apparatus
GB1025300A (en) Improvements in or relating to digital signal detector circuits
GB910453A (en) Improvements in or relating to data transmission systems
GB1071094A (en) Serial to diplex conversion system
GB1013163A (en) Binary information transmission system
GB1321435A (en) Teleprinter communication system
GB1290143A (en)
GB1069930A (en) Improvements in or relating to data transmission systems
GB1026161A (en) Improvements in or relating to frequency-shift digital transmission systems
GB1076557A (en) Improvements in data transmission apparatus
GB1164094A (en) Receiver for a Time Multiplexing Transmission System