Engine sounds of small boats at night transmitted to room in apartment built along canal

In this paper, we show the measurement results of the engine sounds of small boats tat cruise in a canal. The canal that is called an Toyosu canal is in the residential area in Tokyo in Japan. It is a canal with the role of the waterway traffic in Tokyo. The engine sounds were measured there from October to November in 2011. There were a lot of tugboats or tugboats pulling a freighter in daytime. There were a lot of fishing boats day and night, and tere were a lot of houseboats at night. Many of engine sounds were sound exposure level around Lae=80dB. The level of the the greatest was more than sound exposure level Lae=90dB. Especially, the most of boats were passed in the morning and evening. They passed in the early morning when the background noise was 50dB. They passed while obstructing the conversation or waking up. It was a sound with the influence for the inhabitant by the canal. It was shown the result of the engine sound transmitted to the room. The engine noise of the boat was transmitted to the canal side room with high level. These results was described in this paper.