Towards better sound services for elderly listeners, we investigated, for the first time, the sound levels of 15Japanese terrestrial analogue broadcasting channels and digital broadcasting channels including NHK and theCommercial broadcasting Bureaus. The results show that (1) the one-day averaged sound level of the terrestrialchannels was –6.1 dB with 4 dB higher than that of BS digital channels, (2) the maximum level difference of theaveraged sound levels between main programs and advertisements inserted in the programs was over 15 dB and (3)the average level difference was 2.9 dB. These results imply that there exist perceptually significant problems forelderly viewers.
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