GB1179307A - Encoding Binary Information Signals. - Google Patents

Encoding Binary Information Signals.

Info

Publication number
GB1179307A
GB1179307A GB3875567A GB3875567A GB1179307A GB 1179307 A GB1179307 A GB 1179307A GB 3875567 A GB3875567 A GB 3875567A GB 3875567 A GB3875567 A GB 3875567A GB 1179307 A GB1179307 A GB 1179307A
Authority
GB
United Kingdom
Prior art keywords
level
converted
signal
level signal
sum
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
GB3875567A
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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 Telecommunications Radioelectriques et Telephoniques SA TRT filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Publication of GB1179307A publication Critical patent/GB1179307A/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
    • H04L25/4917—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 multilevel codes
    • H04L25/4923—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 multilevel codes using ternary codes

Abstract

1,179,307. Digital transmission systems. TELECOMMUNICATIONS RADIOELECTRIQUES ET TELEPHONIQUES. 23 Aug., 1967 [24 Aug., 1966], No. 38755/67. Heading H4P. Prior to transmission, binary data is converted to multi-level data in which one level is zero and in which there are 2p further levels, each level + q having a corresponding level - q of the same significance. The binary data is first converted to an intermediate signal having (p + 1) levels which is then converted to the (2p + 1) level signal. The latter conversion takes place according to one of three rules, depending on the required spectral characteristics: (a) successive elements in the same level in the (p + 1) level signal are converted to the corresponding level in the (2p + 1) level signal but have opposite signs; or (b) an element in the (p + 1) level signal is converted to the corresponding level in the (2p + 1) level signal and has a sign which is opposite to that of the sum of the levels of the (2p + 1) level signal since the conversion started if the level of the element is lower than the value of this sum; or (c) the value of the sum in (b) above is minimized, and if the sum becomes zero the sign of the next element in the (2p + 1) level signal is made opposite to that of the nearest preceding element having a level other than zero. Transmission may take place via two orthogonal carriers. At the receiver the multilevel signal is converted back to binary. The receiver may contain error-detecting circuitry which prevents errors becoming cumulative.
GB3875567A 1966-08-24 1967-08-23 Encoding Binary Information Signals. Expired GB1179307A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR73993A FR1529567A (en) 1966-08-24 1966-08-24 Methods of conditioning binary information for transmission

Publications (1)

Publication Number Publication Date
GB1179307A true GB1179307A (en) 1970-01-28

Family

ID=8615877

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3875567A Expired GB1179307A (en) 1966-08-24 1967-08-23 Encoding Binary Information Signals.

Country Status (7)

Country Link
JP (1) JPS4811660B1 (en)
BE (1) BE703007A (en)
DE (1) DE1537472A1 (en)
FR (1) FR1529567A (en)
GB (1) GB1179307A (en)
NL (1) NL6711462A (en)
SE (1) SE328024B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7001968A (en) * 1970-02-12 1971-08-16
JPS50139544A (en) * 1974-04-25 1975-11-07
JPS5421455U (en) * 1977-07-14 1979-02-10

Also Published As

Publication number Publication date
DE1537472A1 (en) 1969-08-28
BE703007A (en) 1968-02-23
SE328024B (en) 1970-09-07
NL6711462A (en) 1968-02-26
FR1529567A (en) 1968-06-21
JPS4811660B1 (en) 1973-04-14

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