GB675435A - Improvements in or relating to magnetic sound recording methods - Google Patents
Improvements in or relating to magnetic sound recording methodsInfo
- Publication number
- GB675435A GB675435A GB16585/50A GB1658550A GB675435A GB 675435 A GB675435 A GB 675435A GB 16585/50 A GB16585/50 A GB 16585/50A GB 1658550 A GB1658550 A GB 1658550A GB 675435 A GB675435 A GB 675435A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- field
- speech
- coil
- record carrier
- 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
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/265—Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
675,435. Magnetic sound recording apparatus. ROHLING, H., (trading as ROHLING PHYSIKALISCHES LABORATORIUM, H.). July 3, 1950. [July 4, 1949] No. 16585/50. Class 40 (ii). In a magnetic sound recording apparatus the means producing the speech frequency magnetic field is spaced away from the core or head so that the speech frequency field is induced in the part of the core adjacent to the record carrier, and in the part of the carrier adjacent to the core, means being also provided for a bias magnetisation field. In the embodiments described the core is on one side of the record carrier and the speech frequency field is produced on the other side. In the embodiment described with reference to Fig. 3, a core 2 is surrounded by a coil 3 producing the bias field, which may be A.C. or D.C. The gap 5 of the magnetic core is displaced and a pair of pole-pieces 6 rest on the record carrier 1, forming a recording gap 7. The speech frequency field is generated by an air cored coil 4 which induces a speech field in the part of the record carrier 1 lying between the pole-pieces 6. In a modification, Fig. 4, the bias field is produced by a separate iron-cored magnet 10. In a further modification, Fig. 5 (not shown), both the biassing current and speech current are applied to the terminals of the air-cored coil. In another embodiment, Fig. 6 (not shown), bias magnetisation is provided by the coil 3 on the core 2, and speech magnetisation by a pair of air-cored coils, which may be coupled with a U-shaped core.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT675435X | 1949-07-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB675435A true GB675435A (en) | 1952-07-09 |
Family
ID=3678770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB16585/50A Expired GB675435A (en) | 1949-07-04 | 1950-07-03 | Improvements in or relating to magnetic sound recording methods |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB675435A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1013086B (en) * | 1954-04-14 | 1957-08-01 | Nordwestdeutscher Rundfunk Ans | Method for creating a three-dimensional sound image |
-
1950
- 1950-07-03 GB GB16585/50A patent/GB675435A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1013086B (en) * | 1954-04-14 | 1957-08-01 | Nordwestdeutscher Rundfunk Ans | Method for creating a three-dimensional sound image |
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