Sound levels of TV Advertisements (CMs) were measured relative to those of the adjacent programs because they could not exist individually without adjacent programs. The results show that the averaged sound levels of about 20% of the CMs were over -5 dB with small dynamic ranges less than 10 dB. 57% and 84% of CMs in terrestrial and BS digital broadcasting, respectively, had higher sound levels than the main programs. Next, perceptual experiments were performed for 3 types of TV CMs with different sound levels, resulting in that all CMs sounded louder than a reference speech irrespective of large sound level differences. Finally, comparison of a way of insertion of CMs into programs among Japan, UK and US was performed.
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