GB1133879A - Magnetic tape systems - Google Patents

Magnetic tape systems

Info

Publication number
GB1133879A
GB1133879A GB3890466A GB3890466A GB1133879A GB 1133879 A GB1133879 A GB 1133879A GB 3890466 A GB3890466 A GB 3890466A GB 3890466 A GB3890466 A GB 3890466A GB 1133879 A GB1133879 A GB 1133879A
Authority
GB
United Kingdom
Prior art keywords
tape
write
disc
pulses
gate
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
GB3890466A
Inventor
David Ashley Pears
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.)
Scientific Data Systems Inc
Original Assignee
Scientific Data Systems 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
Priority to FR68329A priority Critical patent/FR1485489A/en
Application filed by Scientific Data Systems Inc filed Critical Scientific Data Systems Inc
Priority to GB3890466A priority patent/GB1133879A/en
Publication of GB1133879A publication Critical patent/GB1133879A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/54—Controlling, regulating, or indicating speed by stroboscope; by tachometer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/46—Controlling, regulating, or indicating speed
    • G11B15/48—Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change
    • 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
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B20/1201—Formatting, e.g. arrangement of data block or words on the record carriers on tapes
    • G11B20/1202—Formatting, e.g. arrangement of data block or words on the record carriers on tapes with longitudinal tracks only
    • G11B20/1205—Formatting, e.g. arrangement of data block or words on the record carriers on tapes with longitudinal tracks only for discontinuous data, e.g. digital information signals, computer programme data

Abstract

1,133,879. Magnetic recording apparatus. SCIENTIFIC DATA SYSTEMS Inc. 31 Aug., 1966, No. 38904/66. Heading G5R. A control system for a magnetic tape-recorder adapted to record blocks of data from a data source comprises a magnetic tape 10 advanced past read-write heads 121, 122 by means of a capstan 11, the passage of fixed increments of tape past a stationary point producing control pulses which are passed to gates 28, 29 governing the passage of digital bits to write heads 121, the gap between the recording of two data blocks being metered by a counter 45. Magnetic tape 10 is slippage free coupled to a capstan 11 which is driven by a tachometer controlled motor 15 having a disc 25 supported on its shaft 16. Disc 25 is provided with tracks 25<SP>1</SP>, 251<SP>1</SP> having magnetically stored markers monitored by transducers 26, 27 which produce electrical sinusoidal signals during rotation of disc 25, the phase and frequency of each wave train being an exact indication of position and speed of the tape. The sinusoidal waves are respectively passed to gates 28, 29 which govern the passage of digital bits to write heads 121 through an " OR " gate 34, the output pulses of which serve as write clock pulses, and an " AND " circuit 35 which receives a write command signal from the set side output of a flip-flop 36. Gated pulses appearing at the output side of " AND " circuit 35 are passed to seven " AND " gates 37 as enabling signals, the writing of seven bits in parallel on tape 10 being clocked from pulses derived from disc 25. An end-of-record code is written after each record to actuate a detector 47 which turns off flip-flop 36 to block gate 35. When tape 10 has travelled a distance X, which is the distance between the read and write head gaps, a detector 41 connected to read head 122 is actuated to set a flip-flop 42 to open gate 43. This gate is connected to counter 45 which counts a predetermined number of bits before producting a write signal in line 46. Counter 45 thus meters the gap between records.
GB3890466A 1966-07-06 1966-08-31 Magnetic tape systems Expired GB1133879A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR68329A FR1485489A (en) 1966-07-06 1966-07-06 Improvements to magnetic tape units
GB3890466A GB1133879A (en) 1966-07-06 1966-08-31 Magnetic tape systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR68329A FR1485489A (en) 1966-07-06 1966-07-06 Improvements to magnetic tape units
GB3890466A GB1133879A (en) 1966-07-06 1966-08-31 Magnetic tape systems

Publications (1)

Publication Number Publication Date
GB1133879A true GB1133879A (en) 1968-11-20

Family

ID=26171811

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3890466A Expired GB1133879A (en) 1966-07-06 1966-08-31 Magnetic tape systems

Country Status (2)

Country Link
FR (1) FR1485489A (en)
GB (1) GB1133879A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142613A1 (en) * 1983-08-26 1985-05-29 WILLI STUDER AG Fabrik für elektronische Apparate Method and apparatus for recording and replay of digital audio data

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101943A (en) * 1976-12-03 1978-07-18 Xerox Corporation Controlled-width-synchronization of recorded pixels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0142613A1 (en) * 1983-08-26 1985-05-29 WILLI STUDER AG Fabrik für elektronische Apparate Method and apparatus for recording and replay of digital audio data
US4620238A (en) * 1983-08-26 1986-10-28 Willi Studer Ag Method and apparatus for recording and replay of digital audio data

Also Published As

Publication number Publication date
FR1485489A (en) 1967-06-16

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