One-segment portable receivers have been rapidly spread in recent years. We have measured the basic characteristics often receivers released in 2007. We measured front-end characteristics using the unique method that uses both a newly developed radio anechoic box and an anechoic chamber as measurement items, because there was no clearly-defined method for measuring the reception characteristic of one-segment portable receiver. Some characteristics vary among receivers. For example, required electric field intensity changes in the time due to the noise generated inside of the receiver.
On-air relay has the advantages of low deployment cost and efficient use of frequency to expand DTTB (Digital Terrestrial Television Broadcasting) throughout Japan. However, there are severe problems of CCI (Co-Channel Interference) caused by interference from other transmitting stations. We have been developing a co-channel interference canceller utilizing an adaptive array antenna to remove such interferences. In this paper, we show the results of a long term field trial for an on-air relay using a trial co-channel interference canceller where the difference in angle of arrival between the desired wave and a CCI wave is 3 degrees.
We developed a Super Hi-Vision automatic editing system. Current Super Hi-Vision images consist of G1, G2, B and R files of each 3840×2160, 10 bits image files and the data rate is around 24 Gb/s. The editing system handles these huge data efficiently.