GB1018248A - Improvements in or relating to magnetic tape recorders - Google Patents

Improvements in or relating to magnetic tape recorders

Info

Publication number
GB1018248A
GB1018248A GB13832/64A GB1383264A GB1018248A GB 1018248 A GB1018248 A GB 1018248A GB 13832/64 A GB13832/64 A GB 13832/64A GB 1383264 A GB1383264 A GB 1383264A GB 1018248 A GB1018248 A GB 1018248A
Authority
GB
United Kingdom
Prior art keywords
heads
transistors
resistors
signals
switching
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
GB13832/64A
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 GB1018248A publication Critical patent/GB1018248A/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
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/12—Masking of heads; circuits for Selecting or switching of heads between operative and inoperative functions or between different operative functions or for selection between operative heads; Masking of beams, e.g. of light beams
    • G11B15/14—Masking or switching periodically, e.g. of rotating heads
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
    • H03K17/62—Switching arrangements with several input- output-terminals, e.g. multiplexers, distributors
    • H03K17/6257—Switching arrangements with several input- output-terminals, e.g. multiplexers, distributors with several inputs only combined with selecting means

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)
  • Television Signal Processing For Recording (AREA)
  • Electronic Switches (AREA)

Abstract

1,018,248. Video-frequency recording &c. apparatus; head switching. AMPEX CORPORATION. April 3, 1964 [May 17, 1963], No. 13832/64. Heading G5R. [Also in Division H3] In a magnetic video tape recorder, four playback heads H1 ... H4 are mounted on the periphery of a rotary drum arranged to pass the heads transversely across the tape, diametrically opposed pairs of heads H1, H3; H2, H4 being connected via slip-rings 22, 24, pre-amplifiers (not shown) and emitter followers Q1, Q1<SP>1</SP> to switching circuits S1, S2 which alternately shortcircuit the signals fed respectively via resistors 40, 40<SP>1</SP> so that the signals from the other group of heads are respectively fed via resistors 42, 42<SP>1</SP> to an emitter follower Q<SP>1</SP>. Each switching circuit comprises a complementary pair of transistors Q3, Q4, Q3<SP>1</SP>, Q4<SP>1</SP>, each pair being made simultaneously conductive during alternate half-cycles of the output of a multivibrator 52, giving two pulses per drum revolution. When conductive, the transistors Q3, Q4 clamp the voltage at the junction of resistors 40, 42 to a level within the positive or negative saturation voltages of the transistors.
GB13832/64A 1963-05-17 1964-04-03 Improvements in or relating to magnetic tape recorders Expired GB1018248A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US281146A US3316358A (en) 1963-05-17 1963-05-17 Switching circuit for rotary magnetic heads

Publications (1)

Publication Number Publication Date
GB1018248A true GB1018248A (en) 1966-01-26

Family

ID=23076131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13832/64A Expired GB1018248A (en) 1963-05-17 1964-04-03 Improvements in or relating to magnetic tape recorders

Country Status (5)

Country Link
US (1) US3316358A (en)
JP (1) JPS4114023B1 (en)
DE (1) DE1211257B (en)
GB (1) GB1018248A (en)
NL (2) NL6404284A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3372283A (en) * 1965-02-15 1968-03-05 Ampex Attenuation control device
US3391471A (en) * 1965-05-21 1968-07-09 Petterson Adolf Helmer Tumbler dryers
US3569618A (en) * 1966-11-04 1971-03-09 Nippon Electric Co Switching device for magnetic recording/reproducing apparatus
GB2229056A (en) * 1989-03-10 1990-09-12 Philips Electronic Associated Differential amplifiers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077545A (en) * 1960-03-07 1963-02-12 Northern Electric Co Gates including (1) diodes and complementary transistors in bridge configuration, and (2) diodes with parallelled complementary transistors
DE1137075B (en) * 1960-07-28 1962-09-27 Licentia Gmbh Circuit arrangement for output elements switched by transistor transistors, in particular relays, in which the collector voltage of the switching transistor is reduced to a permissible value by voltage dividers
GB1052374A (en) * 1962-09-11

Also Published As

Publication number Publication date
US3316358A (en) 1967-04-25
NL132574C (en)
DE1211257B (en) 1966-02-24
NL6404284A (en) 1964-11-18
JPS4114023B1 (en) 1966-08-05

Similar Documents

Publication Publication Date Title
GB1116074A (en) Recording and reproducing system
US2867685A (en) Television recording and reproducing system
GB1018248A (en) Improvements in or relating to magnetic tape recorders
US3346702A (en) Electronic switching system utilizing delay means for switching transient elimination
US3942042A (en) Pulse waveform generator circuit
US3838451A (en) Magnetic tape reproducing system having secondary shorting of a rotary transformer for head switching
GB1172786A (en) Improvements in Coupling Arrangements for the Selective Coupling of a Recording Channel and a Reproducing Channel to a Magnetic Transducer.
GB1003496A (en) Improvements in or relating to signal reproducing systems
ES433966A1 (en) Magnetic recording and/or reproducing system
US3398235A (en) Headwheel speed control system for reproducing magnetically recorded television signals
GB932301A (en) Improvements in or relating to devices for magnetic recording
GB1234439A (en)
GB906789A (en) Improved magnetic tape system
US3499984A (en) Timing error detecting system
GB1434135A (en) Magnetic tape reproducing system
US3288924A (en) Magnetic tape apparatus
US3683127A (en) Multi-channel semiconductor magnetic head
KR790001009B1 (en) Pulse signal formation circuit
ES332160A1 (en) A disposition of magnetic heads to record and reproduce magnetic signals. (Machine-translation by Google Translate, not legally binding)
KR870001011B1 (en) Image head phase detecting apparatus of video tape recorder
SU458864A1 (en) Device for reproducing multi-channel magnetic recording
SU472370A1 (en) Multi-channel magnetic recording and playback device
JPS51143311A (en) Digital magnetic recording system
JPH0113491Y2 (en)
JPS5564606A (en) Signal recording and reproducing device