DE2331050A1 - Reduction of distortion in electromagnetic recording - uses difference current from an extra head without tape passing - Google Patents
Reduction of distortion in electromagnetic recording - uses difference current from an extra head without tape passingInfo
- Publication number
- DE2331050A1 DE2331050A1 DE19732331050 DE2331050A DE2331050A1 DE 2331050 A1 DE2331050 A1 DE 2331050A1 DE 19732331050 DE19732331050 DE 19732331050 DE 2331050 A DE2331050 A DE 2331050A DE 2331050 A1 DE2331050 A1 DE 2331050A1
- Authority
- DE
- Germany
- Prior art keywords
- recording
- head
- tape
- magnetic tape
- magnetic
- 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.)
- Pending
Links
- 239000000696 magnetic material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 2
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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
- G11B5/17—Construction or disposition of windings
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information
-
- 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
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
Description
Wolfgang Backes
Friedrich MüllerWolfgang Backes
Friedrich Müller
Schaltungsanordnung zur Verringerung dQr Verzerrungen bei elektromagnetischer AufzeichnungCircuit arrangement for reducing d Q r distortions in electromagnetic recording
"Die Er fin dim g betrifft eine Schaltungsanordnung, die or gestattet, die Verzerrungen bei Magnetaufzeichnungen während ihres Entstehens zu erfassen und zu kompensieren. Bekanntlich ist die Aufzeichnung elektrischer Signale auf Magnetband, -platte oder -draht noch immer problematisch, da Störungen durch Nichtlinearitäten und Rauschen des verwendeten magnetischen Materials die Aufzeichnung in erheblichem Maße beeinflussen. Verbesserungen des ma^netisierbaren Materials sind mn0 in begrenztem TTmfanp· und mit p-roßem technologischem Aufwand möglich. Das hier beschriebene Verfahren gestattet eine Herabsetzung der Verzerrungen wie Klirren, Tntermodnlation und Rauschen, unabhängig von den speziellen Eigenschaften des magnetisierbaren Materials."The invention relates to a circuit arrangement which allows the distortions in magnetic recordings to be detected and compensated for as they arise noise of the magnetic material used affect the recording considerable extent. improvements of the ma ^ netisierbaren material are mn 0 Rossem p-limited TTmfanp · and with technological expenditure possible. the method described herein allows a reduction of distortions such as clank, Tntermodnlation and noise, regardless of the special properties of the magnetizable material.
Die Erfindung nutzt den Effekt aus, daß in einem zur Aufnahme benutzten Magnetkopf bereits während der Aufnahme durch das vorbeilaufende Magnetband (oder Platte oder Draht) eine Spannung induziert wird, die der bei einer späteren.Wiedergabe induzierten Spannung weitgehend entspricht. Diese Spannung enthält die von dem Magnetband (oder Platte oder Draht) verursachten Verzerrungen und kann zum Zwecke einer Gegenkopplung auf den Aufsprechverstärker gegeben werden.The invention utilizes the effect that in a used for receiving the magnetic head moving past already during recording by d a s magnetic tape (or sheet or wire) induces a voltage corresponding to the induced voltage at a späteren.Wiedergabe largely. This voltage contains the distortions caused by the magnetic tape (or plate or wire) and can be fed to the recording amplifier for the purpose of negative feedback.
Die Herleitung dieser Spannung sei am Beispiel einer ^onbandaufzeichnung erläutert (Abb.1). Der Aufsprechverstärker A steuert den Aufnahmetonkopf T1 an. Den Aufsprechstrom I« kann man sich nun als Summe von zwei Komponenten Ij und I2 vorstellen. Die erste Komponente I1 ist lediglich durch die Aufsprechspannung Ua, die Tonkopfimpedanz % und den Widerstand R bestimmt, wobei der Widerstand R möglichst klein ist und nur der Messung des Stromes dient. Die zweite Komponente Ip resultiert aus der Spannung, die durch das vorbeilaufende Magnetband während der Aufnahme in T-] induziert wird. Diese zweite Komponente, die ein Abbild der im Band festgehaltenen Information ist und auch deren Verzerrungen wiedergibt, kann hergeleitet werden, indem vom gesamten Aufsprechatrom Ia dessen erste Komponente I-| subtrahiert wird. I-| aber läßt sich leicht gewinnen durch eine Impedanz, die der Magnetkopf impedanz 'Jr ohne vorbeilaufendes Band entspricht und die ebenfalls mit der Aufsprechspannung Ua beaufschlagt wird.The derivation of this voltage is explained using the example of an on-tape recording (Fig. 1). The recording amplifier A controls the recording head T1. The opening current I «can now be imagined as the sum of two components Ij and I2. The first component I1 is only determined by the recording voltage U a , the audio head impedance % and the resistance R, the resistance R being as small as possible and only used to measure the current. The second component Ip results from the tension that is induced by the moving magnetic tape during the recording in T-]. This second component which is an image of the captured in the band information and also reflects the distortion can be derived by subtracting from the total Aufsprechatrom Ia whose first component I- | is subtracted. I- | but can easily be obtained by an impedance which corresponds to the magnetic head impedance 'Jr without the tape running past and which is also subjected to the opening voltage Ua.
409884/0522409884/0522
Der Einfachheit halber kann zu diesem 7,v/eclr ein zweiter gleichartiger Tonkopf 1H 2 verwendet werden, an dem kein Band vorbei geführt wird. Die sref orderte Subtraktion kann durch einen Differenzverstärker D oder auch durch einen Transformator geschehen. Am Ausgang von D steht eine Spannung zur Verfügung, die zur Linearisierung des Verhaltens der Gesamtanordnung auf den Aufsprechverstärker A. ge^engekoppelt werden kann.For the sake of simplicity, for this 7, v / eclr a second similar sound head 1 H 2 can be used, on which no tape is passed. The sref ordered subtraction can be done by a differential amplifier D or by a transformer. A voltage is available at the output of D, which can be coupled closely to the recording amplifier A in order to linearize the behavior of the overall arrangement.
Denkbar ist auch, die Differenz der so hergeleiteten Spannunp zur aufzuzeichnenden Spannung auf einer getrennten Magnetspnr aufzuzeichnen und erst bei der Wiedergabe zu einer Korrektur zu benutzen.It is also conceivable that the difference between the two derived Voltage for the voltage to be recorded on a separate Magnetspnr to be recorded and only at to use the playback to make a correction.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732331050 DE2331050A1 (en) | 1973-06-19 | 1973-06-19 | Reduction of distortion in electromagnetic recording - uses difference current from an extra head without tape passing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19732331050 DE2331050A1 (en) | 1973-06-19 | 1973-06-19 | Reduction of distortion in electromagnetic recording - uses difference current from an extra head without tape passing |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2331050A1 true DE2331050A1 (en) | 1975-01-23 |
Family
ID=5884377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19732331050 Pending DE2331050A1 (en) | 1973-06-19 | 1973-06-19 | Reduction of distortion in electromagnetic recording - uses difference current from an extra head without tape passing |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2331050A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1005586A0 (en) * | 1993-05-10 | 1993-11-09 | Philips Electronics Nv | Recording device WITH A TEMPERATURE-DEPENDENT WRITE CURRENT REGULATIONS. |
-
1973
- 1973-06-19 DE DE19732331050 patent/DE2331050A1/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE1005586A0 (en) * | 1993-05-10 | 1993-11-09 | Philips Electronics Nv | Recording device WITH A TEMPERATURE-DEPENDENT WRITE CURRENT REGULATIONS. |
EP0624867A3 (en) * | 1993-05-10 | 1995-01-11 | Philips Electronics Nv | Recording device with temperature-dependent write current control. |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OD | Request for examination | ||
OHW | Rejection |