System for transmitting a digital video signal including time code signals

• US 5,027,193 A
• Filed: 04/23/1990
• Issued: 06/25/1991
• Est. Priority Date: 04/28/1989
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Inoue, Takao, Kani, Tetsuo
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Greening, Wendy R.
• Application Number:
  US07/512,822
• Time in Patent Office: 428 Days
• Field of Search: 358/12, 358/310, 358/311, 358/320, 360/22, 360/27
• US Class Current: 375/240.01
• CPC Class Codes: G11B 27/3054 Vertical Interval Time code [VITC]
• CPC Class Codes: H04N 9/804 involving pulse code modulation of the colour picture signal components

Abstract

In the transmission of digital video data signals, for example, in a digital video tape recorder, a luminance signal and first and second chrominance signals, such as R-Y and B-Y, are individually sampled to provide respective digital luminance data signals and first and second digital chrominance data signals for forming a high-definition video picture. Time code data signals representing the corresponding frame including the sampled signals are provided as individual sets of identical signals. The digital luminance data signals and the first and second digital chrominance data signals are divided into respective sets thereof which each consist of two successive data signals. The sets of time code data signals, digital luminance and first and second digital chrominance data signals are distributed into a plurality of transmission channels in such a manner that each set of digital luminance data signals is interleaved between sets of the first and second digital chrominance data signals, respectively, in each of the transmission channels and that each of the sets of time code data signals is likewise distributed into each of the channels. Further, one of the two successive data signals in each of the sets of digital luminance data signals, first and second digital chrominance data signals and time code data signals is inverted for obtaining the complement of the one of the two successive data signals in each set which has been inverted, thereby substantially minimizing any DC or low-frequency component in each of the transmission channels.

Claims

1. A method of transmitting frames of digital video data signals comprised of digital luminance data signals and first and second digital chrominance data signals, and time code data signals representing addresses of said frames of digital video data, said method comprising the steps of:

dividing said digital luminance data signals into a plurality of sets thereof each consisting of two successive digital luminance data signals;

dividing said first digital chrominance data signals into a plurality of sets thereof, each of said sets of first digital chrominance data signals consisting of two successive first digital chrominance data signals;

dividing said second digital chrominance data signals into a plurality of sets thereof, each of said sets of second digital chrominance data signals consisting of two successive second digital chrominance data signals;

dividing said time code data signals into a plurality of sets thereof, each of said sets of time code data signals consisting of two identical time code data signals;

distributing said sets of digital luminance data signals, said sets of first digital chrominance data signals, said sets of second digital chrominance data signals and said sets of time code data signals into a plurality of transmission channels in such a manner that each said set of digital luminance data signals is interleaved between a set of said first digital chrominance data signals and a set of said second digital chrominance data signals in each of said transmission channels and that each of said sets of time code data signals is distributed into each of said transmission channels; and

inverting one of said two successive data signals in each of said sets of digital luminance data signals and in each of said sets of first and second digital chrominance data signals, and one of said two identical time code data signals in each of said sets of time code data signals for obtaining the complement of said one of the two successive data signals in each set which has been inverted and thereby substantially minimizing any DC component in each of said transmission channels.

2. The method according to claim 1, wherein the digital luminance data signals and the first and second digital chrominance data signals are included within a frame of a video image provided for transmission at a time different from that at which time code data signals representing the same frame of said video image are transmitted;

and further comprising the step of time shifting said digital luminance data signals and said first and second digital chrominance data signals with respect to said time code data signals such that said digital luminance data signals and said first and second digital chrominance data signals are provided simultaneously with said time code data signals representing the same frame.

3. A method of separating received digital video data signals comprising digital luminance data signals, first and second digital chrominance data signals and time code data signals representing frame addresses of digital video data, wherein said signals are distributed in a plurality of transmission channels such that pairs of digital luminance data signals are interleaved between pairs of first digital chrominance data signals and second digital chrominance data signals, pairs of identical time code data signals are distributed into each of said transmission channels, and one of each pair of digital luminance data signals, first and second digital chrominance data signals and time code data signals are transmitted in said channels in an inverted format, said method comprising the steps of:

restoring each of the inverted digital luminance data signals, first and second digital chrominance data signals and time code data signals to its non-inverted data format; and

separating said interleaved digital luminance data signals and first and second digital chrominance data signals, and said time code data signals into respective data channels.

4. The method according to claim 3, further comprising the steps of processing the time code data signals from a plurality of said transmission channels to detect data transmission errors therein, and determining the validity of said time code data signals based on the presence of a plurality of said time code data signals which are free of errors.

5. The method according to claim 4, wherein the step of determining the validity of said time code data signals includes detecting the presence of at least three said time code data signals which are free of errors as an indication of the validity of said time code data signals.

6. The method according to claim 3, wherein the digital luminance data signals and the first and second digital chrominance data signals are included within a frame of a video image transmitted at a time different from that at which time code data signals representing the same frame of said video image are transmitted;

and further comprising the step of time shifting said digital luminance data signals and said first and second digital chrominance data signals with respect to said time code data signals such that said digital luminance data signals and said first and second digital chrominance data signals are provided simultaneously with said time code data signals representing the same frame.

7. A method of transmitting frames of digital video data signals and subsequently receiving said transmitted signals, such digital video data signals comprising digital luminance data signals, first and second digital chrominance data signals and time code data signals representing frame addresses of the digital video data, said method comprising the steps of:

dividing each of said digital luminance data signals, first and second digital chrominance data signals and time code data signals into respective pairs of data signals;

distributing said sets of digital luminance data signals, said sets of first digital chrominance data signals, said sets of second digital chrominance data signals and said sets of time code data signals into a plurality of transmission channels in such a manner that each said set of digital luminance data signals is interleaved between a set of said first digital chrominance data signals and a set of said second digital chrominance data signals in each of said transmission channels and that each of said sets of time code data signals is distributed into each of said transmission channels;

inverting one of said two successive data signals in each of said sets of digital luminance data signals and in each of said sets of first and second digital chrominance data signals, and one of said two identical time code data signals in each of said sets of time code data signals for obtaining the complement of said one of the two successive data signals in each set which has been inverted;

receiving the interleaved digital luminance data signals and first and second digital chrominance data signals, and the time code data signals, from said transmission channels;

restoring each inverted data signal that has been received to its non-inverted data format; and

separating the interleaved digital luminance data signals and first and second digital chrominance data signals, and said time code data signals, into respective data channels.