Excavating
Patent
1985-12-27
1987-12-29
Smith, Jerry
Excavating
358327, 358339, 358314, 360 381, H04N 521, G06F 1100
Patent
active
047165650
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an error concealing system for digital data for use with, for example, a digital VTR.
BACKGROUND ART
An example of a prior art digital VTR will hereinafter be described with reference to FIGS. 1 to 3. In the first place, an arrangement relationship of rotary magnetic heads of the prior art digital VTR will be described with reference to FIG. 1. Reference letter DR designates a tape guide drum which is constituted by a rotary drum as an upper drum and a fixed drum as a lower drum. This tape guide drum DR may be formed of a fixed drum as an upper and lower drum and a rotary drum as a middle drum. Reference letters H.sub.A to H.sub.D designate recording rotary magnetic drums and H.sub.A ' to H.sub.D ' designate reproducing rotary magnetic heads. Each of these rotary magnetic heads is mounted on the rotary drum of the tape guide drum DR with an arrangement relationship that will be described below. The recording rotary magnetic heads H.sub.A, H.sub.B and H.sub.C, H.sub.D are two pairs of recording rotary magnetic heads disposed with an angular spacing of 180.degree., while the reproducing rotary magnetic heads H.sub.A ', H.sub.B ' and H.sub.C ', H.sub.D ' are two pairs of reproducing rotary magnetic heads disposed with an angular spacing of 180.degree.. The lines connecting these two pairs of reproducing rotary magnetic heads and two pairs of recording rotary magnetic heads are perpendicular to each other. The recording rotary magnetic heads H.sub.A and H.sub.B are adapted to record a digitized video signal so as to form magnetic tracks each having a different azimuth on a magnetic tape TP, while upon reproducing the reproducing rotary magnetic heads H.sub.A ' and H.sub.B ' are adapted to reproduce the recorded signals on the respective tracks. Similarly, the recording rotary magnetic heads H.sub.C and H.sub.D are adapted to record a digitized video signal so as to form magnetic tracks each having a different azimuth on the magnetic tape TP, while upon reproducing, the reproducing rotary magnetic heads H.sub.C ' and H.sub.D ' are adapted to reproduce the signals recorded on these tracks.
References TG.sub.1 and TG.sub.2 designate tape guide poles for determining a wrapping angle .theta. with which the magnetic tape TP is wound around the tape guide drum DR. The tape wrapping angle .theta. is selected to be, for example, 240.degree..
Now, a recording system of the prior art digital VTR will be described with reference to FIG. 2. Reference numeral 1 designates an A/D converter to which component color video signals, i.e., a luminance signal Y, a blue color difference signal B-Y and a red color difference signal R-Y are supplied and thereby A/D-converted to be digital component video signals. These digitized component video signals are supplied to a multiplexer 2, in which they are multiplexed and 2-channel encoded and thereby produced as 2-channel multiplexed digital video signals. These signals are supplied to a shuffle or interleaving circuit 3 provided with a memory and thereby shuffled. In this shuffle circuit 3, the 2-channel digital video signals are written in the memory by respective write clock pulses and then read out therefrom by respective read clock signals at a predetermined processing speed, whereby to shuffle the 2-channel digital video signals, thus preventing a burst error from occurring in a reproduced data due to the dropout of the tape and so on.
The 2-channel digital video signals derived from the shuffle circuit 3 are supplied to an error correcting and encoding circuit 4 in which they are encoded and then fed to a time base expanding circuit (FIFO memory) 5 and thereby time-base-expanded. In the time base expanding circuit 5, the 2-channel digital video signals from the error correcting and encoding circuit 4 are written in a memory by a write clock signal corresponding to the processing speed and then read out therefrom by a read clock signal corresponding to the recording rate.
The 2-channel digital video signals derived from the time
REFERENCES:
patent: 4315278 (1982-02-01), Pasdera
patent: 4380069 (1983-04-01), Reitmeier
patent: 4497055 (1985-01-01), Hoshino
patent: 4517600 (1985-05-01), Reitmeier
Beausoliel, Jr. Robert W.
Eslinger Lewis H.
Smith Jerry
Sony Corporation
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