This paper describes a study and computer simulation of a high-definition codec for non-interlaced 525-line (525/1:1) signals. It has been proposed that 525/1:1 signals be used in production systems for future high Picture quality television broadcasting in Japan (EDTV2). This makes high-efficiency 525/1:1 digital compression techniques vital. This experiment investigates the relationship between bit rate and picture quality after compression/decompression, using an experimental codec model and 525/1:1 test sequences for evaluation prepared for this research. Toe results verify the feasibility of a 525/1:1 codec providing primary-distribution picture quality using picture rate of 35 to 50 Mbps.
A frame synchronaizer(FS) is used to synchronize all video signal in TV station. The more video signal pass through FS, the larger a differrence of transmission time between video signal and audio signal is. If a differnce of transmission time between video signal and audio signal is too much large (more than 60ms), televiewer will feel a sence incongunity. We developed the measurement system for a difference of transmission time between video signal and audio signal to adjust audio signal to video signal.
Tokyo Broadcasting System, Inc. (TBS) and TOSHIBA Corporation have succeeded in transmitting digital compressed video/audio signals in full duplex feeds between Miura, Japan, and Las Vegas. The experiments were conducted using the undersea optical cables between Miura and Pacific City, Oregon, linking to the optical fiber circuits between Pacific City and Las Vegas. The fiber optics used in these feeds showed high reliability with much less time delay than communication satellites. Through these experiments, we have learned that optical fiber circuits will play a leading role in the forthcoming era of digital video communication.
A newly developed scanning line conversion algorithm is presented. Interlace TV signals are decomposed into temporal high and low component based on 525/1:1/30 signal format. These two components are separately converted and recomposed to progressive scan signals (525/1:1/60). Compared to existing conversion, aliasing distortion and vertical resolution in motion area are improved. This technique can be applied to letter box conversion as well as progressive scan conversion.