GB636017A - Negative feedback applied to magnetic recording - Google Patents
Negative feedback applied to magnetic recordingInfo
- Publication number
- GB636017A GB636017A GB136648A GB136648A GB636017A GB 636017 A GB636017 A GB 636017A GB 136648 A GB136648 A GB 136648A GB 136648 A GB136648 A GB 136648A GB 636017 A GB636017 A GB 636017A
- Authority
- GB
- United Kingdom
- Prior art keywords
- recording
- amplifier
- transformer
- head
- feed back
- 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
Abstract
636,017. Magnetic sound recording. STANDARD TELEPHONES & CABLES, Ltd., GAYFORD, M. L., and CRAGG, W. D. Jan. 16, 1948, No. 1366. [Class 40 (ii)] Distortion in magnetic recording is reduced by negative feed back of signals as distorted by the recording medium. The feed back signal may be obtained from an 'auxiliary pick-up head, Figs. 1 ... 3 (not shown), and applied through a phase-correcting network to a point in the recording amplifier. In a second embodiment, Fig. 4, the feed back signal is provided by a winding 14, placed between two recording windings 12, 13 on a hybrid recording head, Fig. 5 (not shown). The signal is passed through a low-pass filter 15 and amplifier 16 to the input of the recording amplifier 11. In a third embodiment, Fig. 6, the output of the recording amplifier is applied both to a recording head and to a transformer 26 which has a core made of the same permanent magnetic dust as that used in the recording medium so that the same distortion is introduced. High-frequency bias from oscillator 31 is also applied to transformer 26 and the distorted output fed back via a lowpass filter 28, an integrating amplifier 29, and a phase adjuster 30 to the input of amplifier 11. A filter 40 prevents H.F. bias from feeding back from the recording head to transformer 26.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB136648A GB636017A (en) | 1948-01-16 | 1948-01-16 | Negative feedback applied to magnetic recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB136648A GB636017A (en) | 1948-01-16 | 1948-01-16 | Negative feedback applied to magnetic recording |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB636017A true GB636017A (en) | 1950-04-19 |
Family
ID=9720767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB136648A Expired GB636017A (en) | 1948-01-16 | 1948-01-16 | Negative feedback applied to magnetic recording |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB636017A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5172417A (en) * | 1974-12-20 | 1976-06-23 | Matsushita Electric Ind Co Ltd | JIKIKIROKU SOCHI |
| JPS5567522U (en) * | 1979-11-01 | 1980-05-09 |
-
1948
- 1948-01-16 GB GB136648A patent/GB636017A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5172417A (en) * | 1974-12-20 | 1976-06-23 | Matsushita Electric Ind Co Ltd | JIKIKIROKU SOCHI |
| JPS5838847B2 (en) * | 1974-12-20 | 1983-08-25 | 松下電器産業株式会社 | Jikikiro Kuuchi |
| JPS5567522U (en) * | 1979-11-01 | 1980-05-09 |
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