Kim Frances Matthews

US Patent:

52786471, Jan 11, 1994

Filed:

Aug 5, 1992

Appl. No.:

7/926079

Inventors:

Rajesh Hingorani - Princeton Junction NJ
Kim N. Matthews - Watchung NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H04N 7137
H04N 7133
H04N 713

US Classification:

358136

Abstract:

A decoder for a modified and improved MPEG signal syntax includes a subtractor responsive to an input signal, a frame buffer responsive to the subtractor, a motion compensator responsive to the buffer and to applied motion vector signals, and a multiplier responsive to frame leak signals and to a modified prediction signal for developing an output signal applied to the subtractor. Furthermore, the decoder includes a processor responsive to the motion compensator and to applied adaptive macroblock leak signals for developing the modified prediction signal. The processor comprises a transform circuit responsive to the motion compensator, a gating template responsive to the transform circuit and the adaptive macroblock leak signals, and an inverse transform circuit responsive to the gating template. The transform circuit operates on 2. times. 2 blocks of pixels to form 2. times.