Kazuyuki Takeshita

1.2 Gbit/s HDTV digital VTR

Abstract Some of the essential features of the record/playback system of a new 1.2 Gbit/s digital VTR are described. The VTR can record the full bandwidth of 1125/60 HDTV signals, namely 30 MHz luminance, and 15 MHz for each of the two color difference signals. As for low error rate recording techniques, a cross-shape multilayered amorphous head, a 5 stage transversal filter, a playback head with a narrow trackwidth and a special PLL to cope with stunt motion are employed. At a high data rate of 148.5 Mbit/s and a high linear density of 0.345 μm per bit, the recorder confirms reliable operation with a word error rate of less than 10 −4 .

An Experimental 648 Mbits/s HDTV Digital VTR

One of the most sought-after improvements in HDTV equipment is better VTR picture quality. A promising way to achieve this is through digital recording, which is free from picture quality degradation in the recording and playback processes.