Dynamic magnetic information storage or retrieval – Record editing
Patent
1987-04-08
1990-11-27
Faber, Alan
Dynamic magnetic information storage or retrieval
Record editing
358311, 358335, 358903, 360 351, H04N 5782, H04N 591, G11B 2702
Patent
active
049741110
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method of electronically processing video signals recorded on record medium, particularly magnetic tape or a magnetic or optical disk, and to an apparatus for implementing the method.
It is known in the television studio recording art to process the video signals furnished by a television camera, be it to employ some trick technology or to introduce predistortion to improve the picture in the receiver. All these known measures are rather expensive and hardly usable for home electronic systems.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a method and an apparatus for processing video signals which can also be used in home electronic systems.
The invention is based on the realization that more time is available in a home for processing video signals than in a studio. In principle, the invention utilizes the fact that the video signals to be processed are stored in a primary memory, for example a video recorder, that the stored video signals are written into an intermediate memory for one frame sequence or frame by frame or partial frame by partial frame, are there processed in a predetermined manner by electronic means--in particular corrected, modified and/or retained--and are then written from the intermediate memory back into the same primary memory or into another primary memory.
For the duration of processing, scanning and/or transfer of further video signals from the primary memory is interrupted. During processing of a frame sequence composed of a predetermined number of frames, the primary memory is sampled in steps, for example by operating the video recorder in the start-stop mode. A suitable clock pulse, a gradation influencing device or a programmable computer, for example a home or personal computer can be utilized for the predetermined processing. Magnetic tapes, and also other recordable carriers, such as video disks, can be employed as the record medium. The video signals may be stored in analog or digital form. The accompanying sound may also be subjected to processing, for example compansion.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and features of the invention will be described below with reference to preferred embodiments that are illustrated in the drawings The individual drawing figures depict the following, sometimes not to scale with respect to some of the other figures:
FIG. 1, the block circuit diagram of an apparatus for implementing the method;
FIG. 2, a recording scheme for a magnetic tape in a first embodiment;
FIG. 3, an enlarged sectional view of FIG. 2;
FIG. 4, a plan view of a head wheel arrangement provided in the first embodiment;
FIG. 5, a plan view of a head wheel provided for a second embodiment employing the slant track method;
FIG. 6, a partially developed view of the cylindrical jacket of the head wheel of FIG. 5 in the region of the heads;
FIG. 7, a plan view of a twin head of the head wheel of FIG. 5;
FIG. 8, a side view of the twin head of FIG. 7;
FIG. 9, a track pattern recorded by means of two heads of the head wheel of FIG. 5 for the original picture information;
FIG. 10, the track pattern of FIG. 9 showing additionally recorded processed picture information;
FIG. 11, a plan view of a head wheel provided in a third embodiment employing the slant track method;
FIG. 12, a partially developed view of the cylinder jacket of the head wheel of FIG. 11 in the region of the heads;
FIG. 13, a track pattern recorded by means of two heads of the head wheel of FIG. 11;
FIG. 14, a track pattern recorded by means of two further heads of the head wheel of FIG. 11;
FIG. 15, a track pattern of a recording made initially according to FIG. 13 and thereafter according to FIG. 14;
FIG. 16, a perspective view of a head drum provided in a fourth embodiment employing the slant track method;
FIG. 17, a perspective view of the interaction between the head drum of FIG. 16 and a magnetic tape looped partially around it;
FIG. 18, a track pattern recorded by means of the heads of the head dr
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Adrianus Werner
Einsel Robert
Platte Hans-Joachim
Deutsche Thomson-Brandt GmbH
Faber Alan
U.S. Philips Corporation
Yung W. R.
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