| 摘要 |
PURPOSE: A structure for isolating noise between electric pipes of a broadcasting speaker for each house is provided to prevent all kinds of noises from flowing in and flowing out from the inside of each house by arranging a sound proof cover having a sound absorption pad which blocks the noise flowing in or flowing out. CONSTITUTION: An electric pipe(40) is buried into a wall between each house. The electric pipe flows in front and rear speaker boxes(10,10a). A speaker operation and circulation box(20) is located inside the front and rear speaker boxes. A speaker mounting and sealing plate(30) having a speaker(32) is fixed on a rear side of the speaker operation and circulation box. An anchor bolt(11) and an anchor hole(11a) are formed on a tip surface facing the front and rear speaker boxes. The speaker operation and circulation box is formed between the inner upper and lower part piping projections(12b,12c) and opening(13) of the front speaker box. A sound absorption pad(31) is attached to an inner side of the speaker mounting and sealing plate. |
