Dynamic magnetic information storage or retrieval – Recording for changing duration – frequency or redundant...
Patent
1986-01-17
1988-01-05
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Recording for changing duration, frequency or redundant...
360 13, 360 191, G11B 2702, H04N 578
Patent
active
047179724
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a process for storing of digitally coded video synchronous sound signals in accordance with the type of the main claim. A process for interference signal free assembly of two digitally coded signal segments is already known from DE-OS 32 33 287, in particular of sound signals which are associated with television picture scenes. With the known process it is possible to changeover picture synchronous sound signals in discrete time cycles, preferably in the range of between two half or full pictures without any intermediary stage. However, for this purpose it is required that alternating scanned values or pairs of scanned values must be recorded alternately in at least two channels, and that the transmission for the scanned values of the first sound signal occurs at different time intervals in the different recording channels with respect to the scanned values of the second sound signal. Within the changeover interval which is defined by the actual transmission of the significance of the data of the signal segment to be gated out is changed from a nominall value to a minimal value and the significance of the data of the signal segments to be gated in are changed from a minimum value to a nominal value.
A playback device for pulse code modulated signals (PCM-signals) is also known from DE-OS 30 32 673 which is provided with an editing circuit which expands the PCM-signal trains beyond the intended cutting location with the assistance of delays. Thereby, the PCM-signal trains are alternately supplemented with correcting signals and the output signals of the first PCM-pulse train is brought from a large significance Xl to a small significance XO and the data of the second PCM-pulse train from a small significance XO to a large significance Xl with the assistance of multiplication circuits. Accordingly, the signals characterized by the first PCM-pulse train are gated out in the area of the cutting location and the signals which are characterized by the second pulse train are grated in at the same area of the cutting edge.
ADVANTAGES OF THE INVENTION
In contrast thereto, the process in accordance with the invention for storing digitally coded picture synchronous sound signals with the characterizing features of the main claim is advantageous in that the sound signals from the PCM- pulse train to be gated out as well as the PCM-pulse train of the sound signals to be gated in are available without a two channel recording in the area of any given cutting location between two half or full pictures. A further advantage is that the location of the sound recording is not displaced with respect to the location of the video recording, even during a repeated cutting editing, so that the required lip synchronisation is maintained.
Advantageous further embodiments and improvements of the process stated in the main claim are possible due to the measures stated in the subclaims. It is particularly advantageous that the cut can be simulated as often as desired without destroying the original recording of the cutting location taken into consideration. Therefore, it is no longer required to make protective copies before the cutting editing in case that a cut is made erroneously.
Drawing
Exemplified embodiments of the invention are illustrated in the drawing and are explained in more detail in the following description. The drawings show
FIG. 1 a-d schematically the time cycle of the video information, the sound information before and during the recording, as well as during the playback in accordance with a first exemplified embodiment,
FIG. 2 a-d also schematically the time cycles in accordance with a second exemplified embodiment of the invention.
Description of the Exemplified Embodiments
Line (a) of FIG. 1 schematically illustrates the cycle of the video data for a picture sequence: n, n+1,n+2,n+3. Thereby, the illustrated segments may represent either half pictures, full pictures or subsegments of the same. The data flow is interrupted in the transmission area V between the
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patent: 4555737 (1985-11-01), Hatmann
Patents Abstracts of Japan, vol. 8, No. 153, Jul. 17, 1984, (p. 287), 3 pg., 1590.
Abstract of JP 59-52415.
Psitos Aristotelis M.
Robert & Bosch GmbH
Striker Michael J.
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