GB1036234A - Improvements in or relating to magnetic tape transport systems - Google Patents

Improvements in or relating to magnetic tape transport systems

Info

Publication number
GB1036234A
GB1036234A GB20297/64A GB2029764A GB1036234A GB 1036234 A GB1036234 A GB 1036234A GB 20297/64 A GB20297/64 A GB 20297/64A GB 2029764 A GB2029764 A GB 2029764A GB 1036234 A GB1036234 A GB 1036234A
Authority
GB
United Kingdom
Prior art keywords
input
amplifier
feedback
input signal
diodes
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
GB20297/64A
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.)
Ampex Corp
Original Assignee
Ampex 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 Ampex Corp filed Critical Ampex Corp
Publication of GB1036234A publication Critical patent/GB1036234A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/25—Arrangements for performing computing operations, e.g. operational amplifiers for discontinuous functions, e.g. backlash, dead zone, limiting absolute value or peak value
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
    • H02P7/2885—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude
    • H03G11/002—Limiting amplitude; Limiting rate of change of amplitude without controlling loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Software Systems (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Control Of Direct Current Motors (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

1,036,234. Automatic speed control. AMPLEX CORPORATION. May 15,1964 [Sept. 6, 1963], No. 20297/64. Heading G3R. [Also in Division H3] A reversible magnetic tape transport system uses a motor driven by a dead-zone amplifier prefereably comprising a long-tailed pair of transistors 77, 78 feeding a further transistor 89 and having a pair of feedback paths via diodes 95, 97: 96, 98 provided with adjustable positive and negative bias currents via resistors 101, 102. When the input signal current via resistor 71 is less than the bias current supplied via resistors 101 or 102, diodes 95... 98 are conductive, clamping the input to the output so as to avoid spurious outputs due to noise or drift. Positive or negative input currents greater than the bias current supplied via resistors 101 or 102, cut off the respective diodes 95 and 98 or 96 and 97, thus breaking the negative feedback paths and allowing the amplifier to feed an output via the complementary pair of transistors 93, 94 to the low-inertia printed circuit motor 64. The speed is made proportional to input current by feedback via a tachogenerator (Fig. 1 not shown). The amplifier may be arranged to saturate at an input signal corresponding to half the normal control current fed via 71 so that the motor 64 has constant acceleration until its speed closely approaches normal value when the feedback from the tachogenerator (not shown) is sufficient to reduce the input signal below the saturation level.
GB20297/64A 1963-09-06 1964-05-15 Improvements in or relating to magnetic tape transport systems Expired GB1036234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30711763A 1963-09-06 1963-09-06

Publications (1)

Publication Number Publication Date
GB1036234A true GB1036234A (en) 1966-07-13

Family

ID=23188312

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20297/64A Expired GB1036234A (en) 1963-09-06 1964-05-15 Improvements in or relating to magnetic tape transport systems

Country Status (5)

Country Link
BE (1) BE649141A (en)
DE (1) DE1449709B2 (en)
GB (1) GB1036234A (en)
NL (1) NL6407797A (en)
SE (1) SE322556B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3430692A1 (en) * 1984-08-21 1986-03-06 Robert Bosch Gmbh, 7000 Stuttgart Circuit arrangement for the bipolar limitation of the voltage signal of a voltage source
GB2195213A (en) * 1986-08-27 1988-03-30 Sunstrand Corp Controllable limiter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5322704A (en) * 1976-08-16 1978-03-02 Hitachi Ltd Rotation damping device of tu rntable

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3430692A1 (en) * 1984-08-21 1986-03-06 Robert Bosch Gmbh, 7000 Stuttgart Circuit arrangement for the bipolar limitation of the voltage signal of a voltage source
GB2195213A (en) * 1986-08-27 1988-03-30 Sunstrand Corp Controllable limiter

Also Published As

Publication number Publication date
DE1449709A1 (en) 1969-07-31
NL6407797A (en) 1965-03-08
DE1449709B2 (en) 1970-08-06
BE649141A (en) 1964-10-01
SE322556B (en) 1970-04-13

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