抄録
The authors report a case who placed an earphone in his right ear after drinking alcohol, turned up the volume to a high level to listen to channel 1 (NHK) on television and then fell asleep. After the completion of broadcasting late at night, he was exposed to the sound coming from the television continuously for about six hours, and developed a hearing defect. Fortunately, the hearing defect improved in about 10 days. This hearing disorder appeared to have occurred because the right ear was exposed continuously for about 6 hours to the interior sound of an FM detector circuit which exceeded 84.6 dB. Because the noise generated by an FM detector circuit after the completion of TV broadcasting has a higher sound level than that during broadcasting and also has more components in the middle register than normal environmental noise, the frequency characteristics are likely to cause hearing disor ders.
