DE1072649B - Method for recording or reproducing television pulses using magnetic tapes by means of recording or reproducing members moved transversely to the tape travel direction - Google Patents
Method for recording or reproducing television pulses using magnetic tapes by means of recording or reproducing members moved transversely to the tape travel directionInfo
- Publication number
- DE1072649B DE1072649B DENDAT1072649D DE1072649DA DE1072649B DE 1072649 B DE1072649 B DE 1072649B DE NDAT1072649 D DENDAT1072649 D DE NDAT1072649D DE 1072649D A DE1072649D A DE 1072649DA DE 1072649 B DE1072649 B DE 1072649B
- Authority
- DE
- Germany
- Prior art keywords
- recording
- frequency
- reproducing
- pulses
- subrange
- 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
- 238000000034 method Methods 0.000 title claims description 10
- 210000000056 organ Anatomy 0.000 description 2
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- 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
- H04N5/917—Television signal processing therefor for bandwidth reduction
- H04N5/919—Television signal processing therefor for bandwidth reduction by dividing samples or signal segments, e.g. television lines, among a plurality of recording channels
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
Description
Verfahren zum Aufzeichnen oder Wiedergeben von Fernsehimpulsen unter Verwendung von Magnetbändern mittels quer zur Bandlaufrichtung bewegter Aufzeichnungs-bzw. Wiedergabeorgane Es sind Verfahren zum Aufzeichnen bzw. Wiedergeben von Fernsehimpulsen unter Verwendung von Magnetbändern bekannt, bei denen auf dem Magnetband quer zu dessen Längsrichtung liegende, eng benachbarte, schmale Bildimpulsspuren erzeugt werden, die sich zeitlich lückenlos aneinander anschließen. Bei einer Abart dieses bekannten Verfahrens werden die Spuren schräg zur Bandrichtung aufgetragen, was durch einen oder mehrere rasch um die Achse einer Walze rotierende Magnetköpfe erreicht wird, wobei das an den Kopfspalten vorbewegte Magnetband diese Walze von außen umschlingt. In diesem Zusammenhang ist es auch bekannt, die gleichzeitig aufzutragenden Tonimpulse außerhalb der Bildspur in üblicher Weise aufzuzeichnen.Method for recording or playing back television pulses under Use of magnetic tapes by means of recording or recording devices moved transversely to the direction of travel of the tape. Reproduction organs There are methods for recording or reproducing television pulses known using magnetic tapes, in which on the magnetic tape transversely to whose longitudinal direction, closely spaced, narrow image pulse tracks are generated that follow one another without any gaps in time. In a variant of this known method, the tracks are applied obliquely to the tape direction, what achieved by one or more magnetic heads rotating rapidly around the axis of a roller The magnetic tape moved forward at the head gaps wraps around this roller from the outside. In this context, it is also known that the tone pulses to be applied simultaneously record outside of the image track in the usual way.
Die Hauptschwierigkeiten dieser bekannten Verfahren liegen in der großen Frequenzbandbreite der aufzuzeichnenden Impulse: Während angesichts der hohen Abtastgeschwindigkeit den höchsten Frequenzen von etwa 5,5 MHz eine Periodenlänge der in Querrichtung aufgezeichneten Bildimpulsspur von etwa 10-2 mm entspricht, beträgt für eine Frequenz von beispielsweise 100 Hz die aufgezeichnete Periodenlänge der Spur rund 500 mm, würde also die zur Verfügung stehende Breite des Magnetbandes von beispielsweise 50 mm erheblich überschreiten.The main difficulties of these known methods lie in the large frequency bandwidth of the pulses to be recorded: While given the high Sampling speed the highest frequencies of about 5.5 MHz a period length corresponds to the image pulse track recorded in the transverse direction of about 10-2 mm, is the recorded period length for a frequency of 100 Hz, for example the track would be around 500 mm, i.e. the available width of the magnetic tape of for example 50 mm significantly exceed.
Zur Behebung dieser Schwierigkeiten ist die vorliegende Erfindung auf ein Verfahren zum Aufzeichnen oder Wiedergeben von Fernsehimpulsen unter Verwendung von Magnetbändern mittels quer zur Bandlaufrichtung bewegter Aufzeichnungs- bzw. Wiedergabeorgane gerichtet, bei dem das Frequenzband vor der Aufzeichnung durch frequenzteilende Mittel in einen niederfrequenten und einen höherfrequenten Teilbereich unterteilt und der niederfrequente Teilbereich auf einer Längsspur, der höherfrequente Teilbereich auf Querspuren des Magnetbandes aufgetragen wird.To overcome these difficulties, the present invention is to a method of recording or reproducing television pulses using of magnetic tapes by means of recording or Playback organs directed at which the frequency band before recording through frequency-dividing means into a low-frequency and a higher-frequency subrange divided and the low-frequency section on a longitudinal track, the higher-frequency Partial area is applied to transverse tracks of the magnetic tape.
In diesem Zusammenhang empfiehlt es sich, die Frequenzunterteilung so vorzunehmen, daß die Grenzen des niederfrequenten Teilbereiches zueinander etwa das gleiche Verhältnis bilden wie die des höherfrequenten Teilbereiches. Somit kann der niederfrequente Teilbereich der aufzuzeichnenden Bildimpulse von etwa 30 Hz bis etwa 40 kHz reichen, der höherfrequente Teilbereich von 40 kHz bis etwa 5,5 MHz.In this context, it is advisable to use the frequency subdivision make so that the limits of the low-frequency subrange to each other approximately form the same ratio as that of the higher-frequency sub-range. Thus can the low-frequency sub-range of the image pulses to be recorded of around 30 Hz range up to about 40 kHz, the higher-frequency subrange from 40 kHz to about 5.5 MHz.
Claims (3)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1072649B true DE1072649B (en) | 1960-01-07 |
Family
ID=597074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT1072649D Pending DE1072649B (en) | Method for recording or reproducing television pulses using magnetic tapes by means of recording or reproducing members moved transversely to the tape travel direction |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1072649B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1143225B (en) * | 1961-09-12 | 1963-02-07 | Telefunken Patent | Rotating magnetic head arrangement for scanning broadband signals, in particular television signals |
| DE1154505B (en) * | 1960-04-12 | 1963-09-19 | Philips Nv | Device for magnetic recording of images |
| DE1242673B (en) * | 1964-03-21 | 1967-06-22 | Fernseh Gmbh | Arrangement for the magnetic storage of television broadcasts containing video and audio signals in several longitudinal tracks of a magnetic tape |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB686009A (en) * | 1950-01-11 | 1953-01-14 | Richard Theile | Method of and apparatus for recording pictures |
| DE927999C (en) * | 1953-07-01 | 1955-05-23 | Telefunken Gmbh | Apparatus for magnetic recording and reproduction of television images |
-
0
- DE DENDAT1072649D patent/DE1072649B/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB686009A (en) * | 1950-01-11 | 1953-01-14 | Richard Theile | Method of and apparatus for recording pictures |
| DE927999C (en) * | 1953-07-01 | 1955-05-23 | Telefunken Gmbh | Apparatus for magnetic recording and reproduction of television images |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1154505B (en) * | 1960-04-12 | 1963-09-19 | Philips Nv | Device for magnetic recording of images |
| DE1143225B (en) * | 1961-09-12 | 1963-02-07 | Telefunken Patent | Rotating magnetic head arrangement for scanning broadband signals, in particular television signals |
| DE1242673B (en) * | 1964-03-21 | 1967-06-22 | Fernseh Gmbh | Arrangement for the magnetic storage of television broadcasts containing video and audio signals in several longitudinal tracks of a magnetic tape |
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