摘要:
A recorded data securing mechanism secures data recorded on a recording medium cassette provided with a memory and a data recording enable/disable tab at a predetermined position on the cassette. Breaking the recording enable/disable tab provided on the memory-based recording medium cassette prevents data recorded on the cassette from being written over and ensures that there will be no mismatch between the recording information stored in the memory of the cassette and the data recorded on the recording medium of the cassette. In one embodiment, rewriting is enabled but a memory mismatch flag is set if rewriting results in a mismatch.
摘要:
Bei bisherigen Magnetbandaufzeichnungsgeräten war eine wirtschaftliche Ausnutzung der verwendeten Magnetbandkassetten insbesondere dann schwierig, wenn Aufzeichnungen nicht mehr benötigt wurden, die von anderen bestehenden Aufzeichnungen umgeben waren, so daß sich für eine erneute Aufzeichnung ein nicht zusammenhängender Magnetbandandabschnitt ergab. Für spätere Aufzeichnungen war eine Bedienperson nötig, um die Aufzeichnung immer dann zu unterbrechen, wenn eine bereits vorhandene Aufzeichnung, die erhalten bleiben sollte, übersprungen werden mußte. Bei dem Verfahren nach der vorliegenden Erfindung erfolgt die Aufzeichnung in die nicht zusammenhängenden Magnetbandabschnitte unter selbständigem Überspringen der bereits vorhandenen Aufzeichnungen im schnellen Vorspulbetrieb.
摘要:
Ein Videorecorder weist ein Laufwerk (10) zum Antreiben eines Video-Magnetbandes, eine Bandstandserfassungseinrichtung (11) und eine Laufwerk-Steuereinrichtung (13) auf. Letztere weist eine Automatik-Betriebsart auf, in der sie das Aufzeichnen von Videostücken nur ab solchen Bandpositionen zuläßt, die um ein ganzzahliges Vielfaches eines fest vorgegebenen Bandabschnittswertes hinter einem Bandaufzeichnungsanfang liegen. Der fest vorgegebene Bandabschnittswert beträgt z.B. zwei Stunden. Dies hat zur Folge, daß das Videoband in Bandabschnitte von jeweils zwei Stunden Spieldauer eingeteilt wird. Ausschließlich die Anfänge dieser Bandabschnitte werden vom Videorecorder angefahren, wenn Videostücke aufgezeichnet werden sollen. Dem Benutzer werden auf einem Bildschirm in einer Liste die Titel der aufgenommenen Videostücke in ihrer Aufnahmereihenfolge angezeigt. Am Ende der Liste wird dargestellt, wieviele Bandabschnitte noch frei sind. Sieht der Benutzer, daß Bandabschnitte frei sind und will er ein Videostück aufzeichnen, gibt er dem Videorecorder eine entsprechende Anweisung. Der Videorecorder sucht dann selbständig einen freien Bandabschnitt.
摘要:
Indicator device for cassettes loaded with magnetical information carriers, in which one of the faces of the cassette defines a window, an indicator block is located and guided for a sliding movement between at least two discrete fixed positions in the window, a positioning means is provided to fix the indicator block in said discrete positions, and the free surfaces of the window covered or uncovered by the indicator block are in respective planes with different heights so that the height difference can well be detected by appropriate detecting means.
摘要:
Reproduction of a data signal which is stored on a source media or distributed via a communication network is controlled by inserting master tag data and control tag data into the data signal. A player/recorder inserts an additional generation of control tag information each time a copy of the media is made. If the number of generations of the control tag information is above a threshold value, reproduction of the data signal may be inhibited. For example, if the data signal comprises audio data, the player/recorder may only allow playing of the audio signal over speakers but will not allow recording. The playing and recording of associated signals, such as a video signal which accompanies an audio signal, may also be controlled. The master tag data and control tag data may be provided as spread spectrum signals which are spectrally shaped and power-adjusted according to the data signal to render them imperceptible in the data signal. In a graceful degradation scheme, the additional generation of control tag information is provided at a level which is calculated to cumulatively degrade the quality of the data signal according to the number of generations of control tag information.
摘要:
Even under circumstances where a leakage magnetic field deletes data on adjacent tracks little by little, such deletion can be compensated so as to prevent data errors from occurring. A magnetic disk device includes magnetic disks, magnetic heads, and a write and read circuit for writing or reading data, and writes or reads the data on tracks on the magnetic disks. The number of writes of the data on a given track is acquired and it is detected that the number of writes reaches a predetermined number. Then, based on the detection, the data on the tracks adjacent to a given track is read out once and, then, the data is rewritten on the adjacent tracks. Further, when the data is written on the tracks, the data is written on alternate physical tracks and every other track is skipped and, after the data is written on half of all tracks, the data is written on said skipped tracks.
摘要:
A method and apparatus for varying track recording speed to maximize host-to-tape data transfer rates is presented. Variable data transfer rates of host systems and networks are accommodated by continually adjusting the tape speed to match the tape drive to the host's actual transfer rate. The speed of the tape is adjusted according to both the level of data present in the tape drive data buffer and whether the current mode of the drive is write mode or read mode. In the preferred embodiment, when the tape speed is accelerated or decelerated while writing a number of data track pairs to tape, a predetermined number of dummy track pairs are first written to tape at the current speed. On the next write head phase after the speed is increased or decreased as appropriate while the read heads are over the track, a predetermined number of dummy track pairs followed by more data track pairs are written to the tape at the new speed.
摘要:
A method for producing a copy-protected audio compact disc containing a plurality of symbols within error-correction codewords, representing audio data samples of an audio signal is provided. The method includes the steps of selecting at least one audio data sample of the audio signal (1415); locating the data symbols representing audio data sample (1420); overwriting symbols with erroneous symbols (1440); locating the error-correction codewords associated with the data symbols and disabling the error-correction of said error-correction codewords (1455).