抄録
The draft standard for DTTB(Digital Terrestrial Television Broadcasting) system of Japan was approved employing OFDM(Orthogonal Frequency Division Multiplexing) digital transmission scheme last year. In succession the Association of Radio Industries and Business(ARIB) conducted indoor experiments for protection ratios between digital broadcasting signal and analog broadcasting signals. This paper reports the experimental results about the protection ratios of analog television signal interfered with by DTTB. The protection ratios were led by subjective assessment method following Recommendation ITU-R 500. The results show that Co-channel interference require protection ratios of 47dB, Lower adjacent interference require protection ratios of 0dB, and Upper adjacent interference require protection ratios of 10 dB corresponding to impairment grade 4.5(just perceptible).
