GB952823A - Improvements in or relating to data recording equipment - Google Patents

Improvements in or relating to data recording equipment

Info

Publication number
GB952823A
GB952823A GB15070/62A GB1507062A GB952823A GB 952823 A GB952823 A GB 952823A GB 15070/62 A GB15070/62 A GB 15070/62A GB 1507062 A GB1507062 A GB 1507062A GB 952823 A GB952823 A GB 952823A
Authority
GB
United Kingdom
Prior art keywords
data
signal
motor
phase
rate
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
GB15070/62A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB952823A publication Critical patent/GB952823A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • 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
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
    • G11B27/13—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier the information being derived from movement of the record carrier, e.g. using tachometer
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
    • G06F3/0656—Data buffering arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Stepping Motors (AREA)

Abstract

952,823. Control of A.C. motors. STANDARD TELEPHONES & CABLES Ltd. April 18, 1962 [April 20, 1961], No. 15070/62. Heading H2J. [Also in Division G4] Data which is received at a randomly-varying rate is entered into a buffer store from which it is transferred to a record medium such as a magnetic tape driven by a motor whose speed is adjusted to correspond to the rate at which the data is received. A D.C. signal is derived to represent the amount of data remaining in the buffer store and is applied at TA, Fig. 5, multivibrator MV1 producing pulses at a frequency proportional to the magnitude of the signal and a counter and diode matrix C produce output waveforms b, c, d, e which are supplied in pairs to the windings E1, E2 of a two-phase A.C. motor driving the tape. The resultant waveforms applied to the windings E1, E2 are as shown at f, g of Fig. 6 and are 90 degrees out of phase with each other. As the amount of data in the store is reduced, the motor speed is correspondingly reduced, but the minimum speed is determined by diode DI. If the store becomes empty, a pulse is applied at MA to close gate P, whereupon the counter in C is stopped, and the steady voltages on leads b-e serve to brake the motor. If data, which was previously being received at a high rate, suddenly stops arriving, a signal on lead TF stops MVI and starts MV2, whereupon circuit CS2 operates reversing switch 1NV and the signal applied to winding E2 is reversed in phase to produce an extra braking effect, the initial conditions being resumed as soon as the data input rate and the motor speed are equivalent.
GB15070/62A 1961-04-20 1962-04-18 Improvements in or relating to data recording equipment Expired GB952823A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR859343A FR1294892A (en) 1961-04-20 1961-04-20 Improvements to information recording and reading devices

Publications (1)

Publication Number Publication Date
GB952823A true GB952823A (en) 1964-03-18

Family

ID=8753468

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15070/62A Expired GB952823A (en) 1961-04-20 1962-04-18 Improvements in or relating to data recording equipment

Country Status (3)

Country Link
BE (1) BE616701A (en)
FR (1) FR1294892A (en)
GB (1) GB952823A (en)

Also Published As

Publication number Publication date
BE616701A (en) 1962-10-22
FR1294892A (en) 1962-06-01

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