Shigeru Hirahata

High Quality Digital TV With Frame Store Processing

Though the existing TV standard (NTSC) is a highly sophisticated method to transmit a color television signal without a wide frequency bandwidth, it has some intrinsic problems as follows. (1) Cross-luminance (hanging dots) and cross-color interferences These are caused by the incompleteness of a luminance/ chrominance separation. Hanging dots interference is caused by the cross talk of the chrominance signal into the luminance signal. On the contrary, the cross-color interference is caused by the cross talk of the luminance signal into the chrominance signal. (2) Line flickering and coarse scanning line structure These are caused by interlace scanning. Line flickering is very obvious at the edge where the image changes its brightness in the vertical direction. The coarse scanning line structure can be observed in motion pictures very well because they have only 262.5 scanning lines a field.

Development of picture converting system applying an NTSC signal to a wide aspect display

A picture converting system that can fit input signals to a wide-aspect (16:9) display without jitter and skew was developed. The architecture of the converter and a LSI for its hardware implementation are described. In this system, the compression and enlargement for converting the image were done only by the digital signal processing circuits, and some new methods that were suitable for this digital signal processing system were adopted. This system also included features for minimizing the difference of the luminescence decay of a phosphor between the center and the side portions of the display. >

EDTV System with MUSE/NTSC Down Conversion.

フィールド内処理を基本としたダウンコンバータで問題となる静止画領域での折り返し妨害について検討し, EDTVを用いてMUSE信号受信時に静止画領域での折り返し妨害を除去し, 動画・静止画とも同解像度を確保できるシステムについて提案する.