Motion-Adaptive Vertical-Temporal Helper Signal for EDTV

Abstract

In EDTV-II, a letterbox format is used for wide-aspect ratio. VT (Vertical-Temporal) and VH (Vertical High) helper signals are transmitted in the top and bottom black bars of a 4 : 3 transmitted signal. This paper proposes a motion-adaptive LD (Line Difference) /FD (Frame Difference) hybrid signal for the VT. In the motion adaptive hybrid method, the FD is used in stationary areas and the LD in moving areas. And because the signal with less energy is motion-adaptively selected, the hybrid signal is less visible on current receivers. Transmission noise in EDTV receivers can be reduced by coring and non-linear amplitude companding techniques. The proposed method can be implemented by adding only a few circuits to IDTV receivers (Clear-Vision receivers). Simulation results have clarified that the proposed signal is less annoying than the LD and FD signals.