Sunao Suzuki

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.

Wide aspect TV receiver with aspect detection and non-linear control for picture quality

A signal processing system for wide aspect TV receivers is developed. The system can fit input images and subtitles to the wide screen fully automatically and can control picture quality in a non-linear way using fuzzy inference. >

A Digital Video Equalizer For Cancelling Transmission Distortion

The authors have developed a novel video equalizing system and its LSI with good cost performance which provides appropriate image quality by reducing the transmission distortion and short ghosts. Good detection performance of minute distortions (-35 dB) is achieved even in weak electrical fields as a result of the 128 time additions. A wide equalizing range (-0.7 approximately +3.5 mu s) is realized. Accurate phase matching of the input GCR (ghost cancel reference) signal with the internal reference signal (the phase error being less than 9 nsec) is achieved. High-speed (a minimum of four seconds) equalization is made possible by a novel algorithm. >