Recording/reproduction apparatus for high-definition video signal

• US 5,233,437 A
• Filed: 12/13/1989
• Issued: 08/03/1993
• Est. Priority Date: 12/29/1988
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Morita, Ken, Takahashi, Hiroo, Tachibana, Kaoru
• Primary Examiner(s): MCELHENY JR, DONALD E
• Application Number:
  US07/449,185
• Time in Patent Office: 1,329 Days
• Field of Search: 358/314, 358/336, 360/38.1
• US Class Current: 386/271
• CPC Class Codes: H04N 9/7973 by dividing the luminance or colour component signal samples or frequency bands among a plurality of recording channels H04N9/804, H04N9/825 take precedence
• CPC Class Codes: H04N 9/81 the individual colour picture signal components being recorded sequentially only
• CPC Class Codes: H04N 9/8211 the additional signal being a sound signal H04N9/835 takes precedence
• CPC Class Codes: H04N 9/88 Signal drop-out compensation

Abstract

A recording/reproduction system performs high precision drop-out processing and compensation in the reproduction mode from a disk-shaped recording medium by using a recording format in which a video signal is divided alternately in units of one horizontal scan line into two channels, and the timing of the recorded video signal on one channel is displaced relative to that of the other channel, so as to record the divided signals on a pair of parallel spiral tracks forming the two channels on the disk. A mean value interpolation circuit is provided in each channel for drop-out compensation, and a portion of a reproduced signal of one channel is compensated by a compensation signal produced by the interpolation circuit of the other channel.

Claims

1. A drop-out compensating circuit for video signals reproduced simultaneously from first and second tracks of a recording medium, wherein a first track includes a first video signal having every other video line of an original video signal and a second track includes a second video signal having the remaining video lines of the original video signal that are positionally dislocated by an integer multiple of a time interval of one recording video line relative to the first video signals, the circuit comprising:

a first compensation signal generating circuit receiving a reproduced said first video signal,

a second compensation signal generating circuit receiving a reproduced said second video signal and including skew correcting means for relocating the positionally dislocated lines of the original video signal,

first switching means coupled to said first video signal and said second compensation signal generating circuit for compensating a drop-out video signal present in said first video signal with an output of said second compensation generating circuit, and

second switching means coupled to said second video signal and said first compensation signal generating circuit for compensating a drop-out video signal present in said second video signal with an output of said first compensation generating circuit.

2. A drop-out compensating circuit according to claim 1, further comprising:

drop-out detector means coupled to a first video signal reproduced from said first track for generating a first drop-out detection signal supplied to said first switching means and

coupled to a second video signal reproduced from said second track for generating a second drop-out detection signal supplied to said second switching means.

3. A drop-out compensating circuit according to claim 2, wherein

said first compensation signal generating circuit includes a first mixing circuit for mixing two successive video lines of said first video signal and said second compensation signal generating circuit includes a second mixing circuit for mixing two successive video lines of said second video signal.