| 摘要 |
PROBLEM TO BE SOLVED: To achieve an ear-friendly and natural sound at low cost for a person with relatively lightly hearing handicap through a loudspeaker and any load to nerves. SOLUTION: In a two-by-phone for an effective ear, curved surfaces of a reverberation part and a reverberation board are fine adjusted to collect sound waves inputted from the front of an input entry at almost one point nearby a constricted outlet of output as shown in an image figure in the Fig.7 showing angles of sound wave bouncing, and the two-by-phone is made at light in weight and at ease to carry in shape without loss of portability and usability. |
