GB2155282A - Multi-function data signal processing method and apparatus - Google Patents

Multi-function data signal processing method and apparatus

Info

Publication number
GB2155282A
GB2155282A GB08502576A GB8502576A GB2155282A GB 2155282 A GB2155282 A GB 2155282A GB 08502576 A GB08502576 A GB 08502576A GB 8502576 A GB8502576 A GB 8502576A GB 2155282 A GB2155282 A GB 2155282A
Authority
GB
United Kingdom
Prior art keywords
data signal
signal processing
processing method
processed
function data
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.)
Granted
Application number
GB08502576A
Other versions
GB2155282B (en
GB8502576D0 (en
Inventor
David James Thomson
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of GB8502576D0 publication Critical patent/GB8502576D0/en
Publication of GB2155282A publication Critical patent/GB2155282A/en
Application granted granted Critical
Publication of GB2155282B publication Critical patent/GB2155282B/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
    • H04L25/4906—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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
    • G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code

Abstract

A data signal is processed to change its form and spectral content without introducing undesirable frequency and amplitude effects. Multiple data signal states, which determine the essential characteristics of the output signal wave configuration, are utilized in conjunction with clock signals at a rate substantially in excess of twice the largest frequency component of the data signal in order to construct the desired output signal wave configuration. In one embodiment, an input data signal (23, 26) is in an NRZ format and is processed for conversion to the biphase, or Manchester, format by a ROM table (10) look-up function addressed jointly by the input signal states and the clock (11) signals.
GB08502576A 1983-06-08 1984-05-10 Multi-function data signal processing method and apparatus Expired GB2155282B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50219883A 1983-06-08 1983-06-08

Publications (3)

Publication Number Publication Date
GB8502576D0 GB8502576D0 (en) 1985-03-06
GB2155282A true GB2155282A (en) 1985-09-18
GB2155282B GB2155282B (en) 1987-02-18

Family

ID=23996781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08502576A Expired GB2155282B (en) 1983-06-08 1984-05-10 Multi-function data signal processing method and apparatus

Country Status (4)

Country Link
JP (1) JPS60501533A (en)
CA (1) CA1226067A (en)
GB (1) GB2155282B (en)
WO (1) WO1984005002A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180932A (en) * 1984-09-28 1986-04-24 Nec Corp Msk type modulating method
JPH0685535B2 (en) * 1985-10-26 1994-10-26 日本電気株式会社 Quadrature phase modulation encoder
NL8601114A (en) * 1986-05-01 1987-12-01 Philips Nv TRANSMISSION SYSTEM FOR THE TRANSFER OF DATA BITS.
JPH02143740A (en) * 1988-11-25 1990-06-01 Nec Corp Modulator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048784A (en) * 1959-10-09 1962-08-07 Westinghouse Electric Corp Binary input-a. c. wave output selector using bipolar generator, integrator, and low pass filter
US3183442A (en) * 1959-10-09 1965-05-11 Westinghouse Electric Corp Phaseproof pulse signal transmission system utilizing binary to quaternary conversion means
US3962647A (en) * 1974-09-27 1976-06-08 The Bendix Corporation Biphase waveform generator using shift registers
US4410955A (en) * 1981-03-30 1983-10-18 Motorola, Inc. Method and apparatus for digital shaping of a digital data stream

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53108358A (en) * 1977-03-04 1978-09-21 Fujitsu Ltd Generation system of optional wavefor
JPS5799851A (en) * 1980-12-13 1982-06-21 Usac Electronics Ind Co Ltd Signal transmission system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048784A (en) * 1959-10-09 1962-08-07 Westinghouse Electric Corp Binary input-a. c. wave output selector using bipolar generator, integrator, and low pass filter
US3183442A (en) * 1959-10-09 1965-05-11 Westinghouse Electric Corp Phaseproof pulse signal transmission system utilizing binary to quaternary conversion means
US3962647A (en) * 1974-09-27 1976-06-08 The Bendix Corporation Biphase waveform generator using shift registers
US4410955A (en) * 1981-03-30 1983-10-18 Motorola, Inc. Method and apparatus for digital shaping of a digital data stream

Also Published As

Publication number Publication date
JPS60501533A (en) 1985-09-12
GB2155282B (en) 1987-02-18
CA1226067A (en) 1987-08-25
WO1984005002A1 (en) 1984-12-20
GB8502576D0 (en) 1985-03-06

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20030510