GB654584A - Apparatus for recording of electric impulses - Google Patents
Apparatus for recording of electric impulsesInfo
- Publication number
- GB654584A GB654584A GB395448A GB395448A GB654584A GB 654584 A GB654584 A GB 654584A GB 395448 A GB395448 A GB 395448A GB 395448 A GB395448 A GB 395448A GB 654584 A GB654584 A GB 654584A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- transducers
- tape
- recording
- transducer
- 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
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
- H04L13/02—Details not particular to receiver or transmitter
- H04L13/06—Tape or page guiding or feeding devices
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
654,584. Magnetic sound recording and reproducing apparatus. DIAMAND, W. March 11, 1949, No. 3954/48. [Class 40 (ii)] In a magnetic recording and reproducing apparatus in which parallel curved tracks are formed on a moving magnetic strip 1 by means of a plurality of magnetic transducers 7 radially mounted and equally spaced on a revolving plate, the said transducers are so arranged during recording that one transducer is still recording at the end of one track after the next transducer has commenced at the beginning of the next track, both transducers recording at full intensity during the overlapping period. In order to obtain a smooth change-over from one track to another during reproduction, the signal current in one transducer is progressively decreased as the current in the next is progressively increased. The electric connection with the transducers may be by slip rings, and the change-over controlled by electric contacts or relays operated by the rotating disc to produce pulses causing the extinction of current in one transducer while causing the simultaneous appearance of current in the next transducer. The transfer may be effected smoothly by arranging that the said pulses control two pentode circuits, the anode current versus grid voltage characteristic of which are logarithmic, i.e. the output current proportional to the product of two input voltages, the pulse signal being of such a nature as to produce an auxiliary voltage in one circuit causing a proportional extinction of current, and in the other circuit a proportional increase of current. The plate carrying the transducers is provided with teeth 9 engaging a gear-wheel 10 on a worm shaft driving a sprocket 4 which controls the velocity of the tape past the transducers. A lever 17 and an actuating solenoid 21 is provided to enable the tape to be disengaged from the sprocket 4 to allow the tape to run at an increased speed for locating quickly a desired part of the record. The distance of this high-speed travel of the tape may be defined by arranging a reproducing head at the edge of the tape where equidistant markings have been recorded magnetically. The output current from this head may then feed an electronic counter followed by a mechanical counter. A pre-setting arrangement may be provided whereby the counters operate a relay at the pre-set marking and restore the tape to its slow movement automatically, ready to start reproducing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB395448A GB654584A (en) | 1949-03-11 | 1949-03-11 | Apparatus for recording of electric impulses |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB395448A GB654584A (en) | 1949-03-11 | 1949-03-11 | Apparatus for recording of electric impulses |
Publications (1)
Publication Number | Publication Date |
---|---|
GB654584A true GB654584A (en) | 1951-06-20 |
Family
ID=9768014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB395448A Expired GB654584A (en) | 1949-03-11 | 1949-03-11 | Apparatus for recording of electric impulses |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB654584A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE943534C (en) * | 1948-10-02 | 1956-05-24 | Siemens Ag | Method and arrangement for recording characters |
DE1023898B (en) * | 1954-10-21 | 1958-02-06 | Loewe Opta Ag | Magnetic dictation machine |
WO1995013608A1 (en) * | 1993-11-12 | 1995-05-18 | Conner Peripherals, Inc. | Process for manufacturing recording heads for magnetic storage devices |
-
1949
- 1949-03-11 GB GB395448A patent/GB654584A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE943534C (en) * | 1948-10-02 | 1956-05-24 | Siemens Ag | Method and arrangement for recording characters |
DE1023898B (en) * | 1954-10-21 | 1958-02-06 | Loewe Opta Ag | Magnetic dictation machine |
WO1995013608A1 (en) * | 1993-11-12 | 1995-05-18 | Conner Peripherals, Inc. | Process for manufacturing recording heads for magnetic storage devices |
US5523539A (en) * | 1993-11-12 | 1996-06-04 | Conner Peripherals, Inc. | Process for manufacturing recording heads for magnetic storage devices |
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