SE319523B - - Google Patents

Info

Publication number
SE319523B
SE319523B SE835665A SE835665A SE319523B SE 319523 B SE319523 B SE 319523B SE 835665 A SE835665 A SE 835665A SE 835665 A SE835665 A SE 835665A SE 319523 B SE319523 B SE 319523B
Authority
SE
Sweden
Prior art keywords
data
bits
clock
frequency
carrier
Prior art date
Application number
SE835665A
Inventor
E Gorog
Original Assignee
Ibm
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 Ibm filed Critical Ibm
Publication of SE319523B publication Critical patent/SE319523B/xx

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.
SE835665A 1964-06-26 1965-06-23 SE319523B (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
SE319523B true SE319523B (en) 1970-01-19

Family

ID=8572332

Family Applications (1)

Application Number Title Priority Date Filing Date
SE835665A SE319523B (en) 1964-06-26 1965-06-23

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
CH422874A (en) 1966-10-31
DE1234777B (en) 1967-02-23
FR1413909A (en) 1965-10-15
GB1089155A (en) 1967-11-01

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