FR1456318A - Système de détection en fréquence double - Google Patents

Système de détection en fréquence double

Info

Publication number
FR1456318A
FR1456318A FR40771A FR40771A FR1456318A FR 1456318 A FR1456318 A FR 1456318A FR 40771 A FR40771 A FR 40771A FR 40771 A FR40771 A FR 40771A FR 1456318 A FR1456318 A FR 1456318A
Authority
FR
France
Prior art keywords
detection system
frequency detection
dual frequency
dual
frequency
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
FR40771A
Other languages
English (en)
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
Application granted granted Critical
Publication of FR1456318A publication Critical patent/FR1456318A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/13—Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals
    • 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
    • G11B20/10009—Improvement or modification of read or write signals
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • 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
    • H04L25/4904—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 self-synchronising codes, e.g. split-phase codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/06—Speed or phase control by synchronisation signals the synchronisation signals differing from the information signals in amplitude, polarity or frequency or length

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Nonlinear Science (AREA)
  • Manipulation Of Pulses (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
FR40771A 1964-12-21 1965-12-03 Système de détection en fréquence double Expired FR1456318A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US419797A US3405391A (en) 1964-12-21 1964-12-21 Double frequency detection system

Publications (1)

Publication Number Publication Date
FR1456318A true FR1456318A (fr) 1966-10-21

Family

ID=23663799

Family Applications (1)

Application Number Title Priority Date Filing Date
FR40771A Expired FR1456318A (fr) 1964-12-21 1965-12-03 Système de détection en fréquence double

Country Status (4)

Country Link
US (1) US3405391A (fr)
DE (1) DE1273563B (fr)
FR (1) FR1456318A (fr)
GB (1) GB1074027A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518648A (en) * 1966-11-07 1970-06-30 Subscription Television Inc High density record and reproduce system
US3500385A (en) * 1967-07-17 1970-03-10 Ibm Coded data storage and retrieval system
US3537084A (en) * 1967-08-14 1970-10-27 Burroughs Corp Data storage timing system with means to compensate for data shift
JPS5198006A (fr) * 1975-02-21 1976-08-28
DE2963491D1 (en) * 1978-08-16 1982-09-30 Ward Goldstone Ltd A multiplex information handling system
US4313206A (en) * 1979-10-19 1982-01-26 Burroughs Corporation Clock derivation circuit for double frequency encoded serial digital data
US4320525A (en) * 1979-10-29 1982-03-16 Burroughs Corporation Self synchronizing clock derivation circuit for double frequency encoded digital data

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2807003A (en) * 1955-04-14 1957-09-17 Burroughs Corp Timing signal generation
GB851520A (en) * 1956-02-06 1960-10-19 Int Computers & Tabulators Ltd Improvements in or relating to magnetic reading and recording
US3108265A (en) * 1957-08-14 1963-10-22 Time Inc Magnetic data recording system
US3020523A (en) * 1960-06-13 1962-02-06 William R Mckeon Auto key reminder
US3300578A (en) * 1963-06-12 1967-01-24 Bell Telephone Labor Inc Data transmission

Also Published As

Publication number Publication date
US3405391A (en) 1968-10-08
DE1273563B (de) 1968-07-25
GB1074027A (en) 1967-06-28

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