FR2446561A1 - Procede et appareil pour l'interpretation des donnees codees en code f2f - Google Patents
Procede et appareil pour l'interpretation des donnees codees en code f2fInfo
- Publication number
- FR2446561A1 FR2446561A1 FR7536647A FR7536647A FR2446561A1 FR 2446561 A1 FR2446561 A1 FR 2446561A1 FR 7536647 A FR7536647 A FR 7536647A FR 7536647 A FR7536647 A FR 7536647A FR 2446561 A1 FR2446561 A1 FR 2446561A1
- Authority
- FR
- France
- Prior art keywords
- distorted
- hand
- frequency
- compensates
- reader
- 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
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/01—Details
- G06K7/016—Synchronisation of sensing process
- G06K7/0166—Synchronisation of sensing process by means of clock-signals derived from the code marks, e.g. self-clocking code
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Procédé d'interprétation de données codées en code F2F. L'utilisation d'au moins un bit de préambule avant chaque caractère de données permet de mesurer les espacements entre les transitions du signal et d'ajuster un créneau de recherche ou de masquage des transitions pour tenir compte des effets de l'étalement d'impression et/ou de l'accélération. Application aux systèmes de détection optique ou magnétique de données codées en largeurs de barres.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/538,272 US3947662A (en) | 1974-12-31 | 1974-12-31 | Distorted two frequency coded data interpreting method and apparatus |
US05/546,572 US3969613A (en) | 1975-02-03 | 1975-02-03 | Two frequency coded data interpreting method and apparatus |
US05/546,852 US3959626A (en) | 1975-02-03 | 1975-02-03 | Distorted two frequency coded data interpreting method and apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2446561A1 true FR2446561A1 (fr) | 1980-08-08 |
FR2446561B1 FR2446561B1 (fr) | 1982-02-05 |
Family
ID=27415272
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7536647A Granted FR2446561A1 (fr) | 1974-12-31 | 1975-11-21 | Procede et appareil pour l'interpretation des donnees codees en code f2f |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2446561A1 (fr) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3235855A (en) * | 1961-10-02 | 1966-02-15 | Honeywell Inc | Binary magnetic recording apparatus |
FR2090793A5 (fr) * | 1970-04-27 | 1972-01-14 | Olivetti & Co Spa | |
US3701097A (en) * | 1971-01-20 | 1972-10-24 | Identicon Corp | Decoding bar patterns |
US3711843A (en) * | 1970-04-27 | 1973-01-16 | Olivetti & Co Spa | Self-adapting synchronization system for reading information from a moving support |
FR2143920A1 (fr) * | 1971-07-01 | 1973-02-09 | Barnes Roland | |
US3727202A (en) * | 1972-01-10 | 1973-04-10 | Telex Computer Products | Application of an automatic pulse width controlled, monostable multivibrator for detecting phase encoded information on magnetic tape |
US3737632A (en) * | 1972-03-23 | 1973-06-05 | R Barnes | Rate adaptive nonsynchronous demodulator apparatus for biphase binary signals |
-
1975
- 1975-11-21 FR FR7536647A patent/FR2446561A1/fr active Granted
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3235855A (en) * | 1961-10-02 | 1966-02-15 | Honeywell Inc | Binary magnetic recording apparatus |
FR2090793A5 (fr) * | 1970-04-27 | 1972-01-14 | Olivetti & Co Spa | |
US3711843A (en) * | 1970-04-27 | 1973-01-16 | Olivetti & Co Spa | Self-adapting synchronization system for reading information from a moving support |
US3701097A (en) * | 1971-01-20 | 1972-10-24 | Identicon Corp | Decoding bar patterns |
FR2143920A1 (fr) * | 1971-07-01 | 1973-02-09 | Barnes Roland | |
US3727202A (en) * | 1972-01-10 | 1973-04-10 | Telex Computer Products | Application of an automatic pulse width controlled, monostable multivibrator for detecting phase encoded information on magnetic tape |
US3737632A (en) * | 1972-03-23 | 1973-06-05 | R Barnes | Rate adaptive nonsynchronous demodulator apparatus for biphase binary signals |
Also Published As
Publication number | Publication date |
---|---|
FR2446561B1 (fr) | 1982-02-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |