04661862 is referenced by 120 patents and cites 30 patents.

A wide-aspect-ratio HDTV signal having 1600 luminance pixels/32 .mu.S line and 980 lines/frame is data reduced by deleting odd pixels of each line of TV field #1 and even pixels of each line of TV field #2 to produce 800 pixels per line, and is further data compressed by a form of differential-pulse-code modulation. The DPCM organizes the pixels into groups of five, and for each group transmits or records one reference pixel at full N-bits. The pixels to the right and left of the reference pixel are compared therewith to produce difference signals of M bits, where M<N. The remaining two pixels of each group are compared with reference pixels from the lines above and below to form M-bit difference signals. The difference signals are transmitted. The DPCM coding reduces the 800 pixels/line to the equivalent of 480 pixels/line. The color portion of the wide-aspect-ratio HDTV is similarly coded to produce the equivalent of 240 pixel/line. The 480 luminance samples and 240 color samples are added to form 720 samples/line, or 1440 samples/64 .mu.sec which can be accommodated by a CCIR-standard-601 signal processing system.

Title
Differential PCM video transmission system employing horizontally offset five pixel groups and delta signals having plural non-linear encoding functions
Application Number
6/604501
Publication Number
4661862
Application Date
April 27, 1984
Publication Date
April 28, 1987
Inventor
Charles R Thompson
Morrestown Township, Burlington County
NJ, US
Agent
R G Coalter
P M Emanuel
P J Rasmussen
Assignee
RCA Corporation
NJ, US
IPC
H04N 7/12
H04N 7/13
H04N 5/92
View Original Source