GB1196323A - Preamplifier Arrangements for use in a system for Reproducing Signals from a Magnetic Medium such as a Tape - Google Patents

Preamplifier Arrangements for use in a system for Reproducing Signals from a Magnetic Medium such as a Tape

Info

Publication number
GB1196323A
GB1196323A GB1603367A GB1603367A GB1196323A GB 1196323 A GB1196323 A GB 1196323A GB 1603367 A GB1603367 A GB 1603367A GB 1603367 A GB1603367 A GB 1603367A GB 1196323 A GB1196323 A GB 1196323A
Authority
GB
United Kingdom
Prior art keywords
preamplifier
head
input stage
transistor
stage
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
GB1603367A
Inventor
Allen J Trost
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 GB1196323A publication Critical patent/GB1196323A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/93—Regeneration of the television signal or of selected parts thereof
    • H04N5/931—Regeneration of the television signal or of selected parts thereof for restoring the level of the reproduced signal
    • H04N5/9315—Regeneration of the television signal or of selected parts thereof for restoring the level of the reproduced signal the level control being frequency dependent

Abstract

1,196,323. Recording and playback; local circuits. AMPEX CORP. 16 May, 1967 [16 May, 1966], No. 16033/67. Heading G5R. [Also in Division H3] In a playback head and preamplifier arrangement having a magnetic playback head 10 connected to the input stage of a preamplifier 12, the frequency response of the connected playback head and preamplifier is substantially flat over a pass-band wide enough for video signals, the input stage has a lower impedance input than the impedance of the head's circuit and the preamplifier comprises a grounded emitter transistor input stage 13, a common base transistor intermediate stage 24 and a common collector transistor output stage 36 with negative feedback from the output stage to the base of transistor 13. The impedances of the input stage and head circuit are arranged such that a resonant peak of the head's circuit which occurs within the pass-band is swamped out. The input stage has a power gain which is sufficient to override noise contributed by following stages. The low input impedance of the amplifier is provided by a negative feedback path via capacitor 42 and resistor 41. The playback head may be used for reproducing signals from tape and is coupled to the input stage 13 by a rotary transformer 22. An emitter follower transistor 36 provides impedance matching of the output of the amplifier to a low impedance, coaxial cable 34. Reference has been directed by the Comptroller to Specifications 1,008,257 and 1,054,686.
GB1603367A 1966-05-16 1967-05-16 Preamplifier Arrangements for use in a system for Reproducing Signals from a Magnetic Medium such as a Tape Expired GB1196323A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US55030566A 1966-05-16 1966-05-16

Publications (1)

Publication Number Publication Date
GB1196323A true GB1196323A (en) 1970-06-24

Family

ID=24196609

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1603367A Expired GB1196323A (en) 1966-05-16 1967-05-16 Preamplifier Arrangements for use in a system for Reproducing Signals from a Magnetic Medium such as a Tape

Country Status (5)

Country Link
JP (1) JPS598885B1 (en)
BE (1) BE697655A (en)
DE (1) DE1524719A1 (en)
GB (1) GB1196323A (en)
NL (1) NL6706766A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53111708A (en) * 1977-03-11 1978-09-29 Hitachi Ltd Vide signal reproducing circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56137508A (en) * 1980-03-28 1981-10-27 Hitachi Ltd Magnetic recording and reproducing device
JPS5740142U (en) * 1980-08-18 1982-03-04
DE19513302A1 (en) * 1995-04-07 1996-10-10 Agfa Gevaert Ag Method and device for reading magnetically stored signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53111708A (en) * 1977-03-11 1978-09-29 Hitachi Ltd Vide signal reproducing circuit
JPS6012683B2 (en) * 1977-03-11 1985-04-03 株式会社日立製作所 Video signal regeneration circuit

Also Published As

Publication number Publication date
DE1524719A1 (en) 1972-03-23
BE697655A (en) 1967-10-02
JPS598885B1 (en) 1984-02-28
NL6706766A (en) 1967-11-17

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Legal Events

Date Code Title Description
PS Patent sealed
PE Patent expired