摘要:
A method of and apparatus for obtaining digital expression of analog signals, in particular signals produced by "reading" (i.e., tranducing) head-positioning information recorded on storage media, for example magnetic recording media. Head-positioning signals (36, 38) constitute signals bursts which are processed to obtain pulses whose width is dictated by the amplitude of the detected bursts, and the pulse width in each instance is expressed digitally by using the magnitude of the pulse to drive a counter-timer (61). The resulting count integrally embodies a digitized representation of the initial analog signal burst, which is directly available for further processing by digital means and for storage in digital memory apparatus.
摘要:
1. Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Aufzeichnung und Wiedergabe von Informationen bei einem ROM-RAM-Speichermedium. 2. Aufgabe ist es, die verfügbare Speicherkapazität des ROM-RAM-Speichermediums trotz unterschiedlicher Aufzeichnungs- und Wiedergabeverfahren auf eine über die mit der Summe der unterschiedlich Verfahren erreichbare Kapazität hinausgehend zu erhöhen und die durch das Wobbeln der ROM-Informationsspur bedingten Nachteile bei gleichzeitiger Verringerung des Aufwandes zu vermeiden. 2.2 Erfindungsgemäß werden zur Aufzeichnung von Informationen aus dem ROM-Bereich des ROM-RAM-Speichermediums gelesene Daten zur Hilfe genommen und/oder eine Wiedergabe von Informationen aus dem RAM-Bereich unter Zuhilfenahme von aus dem ROM-Bereich des ROM-RAM-Speichermediums gelesener Daten durchgeführt. 2.3 Das Anwendungsgebiet betrifft insbesondere ROM-RAM-Speichermedien sowie entsprechende Geräte zur Aufzeichnung und Wiedergabe der Informationen.
摘要:
Recorded information is reproduced from a recordable optical disc with a light beam applied from an optical pickup to the recordable optical disc. The recordable optical disc has a program area for recording main information, a PMA area for recording recording history information relative to main information which is in the process of being recorded in the program area, and a lead-in area for recording, as index information, recording history information relative to main information which has fully been recorded in the program area. While the recordable optical disc is at rest, it is determined whether index information is recorded in the lead-in area, and if index information is not recorded in the lead-in area, the optical pickup is moved to a region of the PMA area where the recording history information is recorded while the recordable optical disc is at rest. After the optical pickup has reached the region, the optical pickup reads the recording history information while the recordable optical disc is being rotated. After the recording history information has been read from the region, the optical pickup Is moved to the program area while the recording optical disc is being rotated at a constant speed.
摘要:
An information recording card has plural information tracks (3) approximately perpendicular to the direction of information arrangement in each track, and reading head alignment patterns (202) recorded along the extention of the direction of plural information tracks. An information regenerating process from the information recording card has a step of positioning a reading head by relative movement of the head and the alignment pattern, and a step of moving the reading head relative to the plural information tracks, wherein the relative speed in the former step is lower than that in the latter.
摘要:
A method of initializing a data-recording media (10), particularly tape, by use of the same type of media drive used for data-recording purposes, in which the edge (42) of the recordable field on the media (10) is first located by a test read / write process and the media is then transported in a succession of passes across a transducing head (62), during each of which the head is periodically and selectively energized to write spaced marker bursts (46) and servo-positioning bursts (36, 38), with the transducing head (62) being moved open-loop a distance corresponding to a half-track width between each media transport. During the first such pass, the marker bursts (46) and servo-positioning bursts (36, 38) are located on the basis of tape travel distance, and on successive passes burst location is determined by sensing the previously-recorded marker and servo bursts and timing a predetermined distance therefrom by use of an internal clock. In the case of tape, successive recording passes are made with the tape travelling alternately backwards and forwards.
摘要:
A data recording apparatus is provided which has a recording/reproduction head (3) for recording data on or reproducing the data from a recording medium, a moving mechanism (92, 93) for moving the recording/reproducing head (3) on the recording medium, an error detectors (78,85) for detecting an error in accordance with a signal from the recording/reproduction head (3) in the recording mode, and a control section (21) for detecting that an access to a recording start track cannot be made by the recordingl reproduction head (3) for recording data, for determining a track number in the vicinity of the recording start track by the recording/reproduction head (3) in accordance with a detection result, and for controlling a moving mechanism (92, 93) to move the recording/reproduction head (3) to a target track ahead of a predetermined number of tracks which correspond to a distance between the target track and the recording start track without performing recording of data on the predetermined number of tracks in accordance with a detection result from a tracking error detector (78, 85).