| 摘要 |
PROBLEM TO BE SOLVED: To obtain a natural voice echo unit capable of hearing an echo only by oneself who utters a big sound without troubling others. SOLUTION: Echo guide devices for guiding an echo are integrated with an echo guide unit main body on the both sides. Then, in order to enhance the effect of the echo, cork tapes are stuck on the inside and in order to obtain a further more sound effect of the echo, a sound effect device 3 of a tongue- shaped thin material with lots of holes is provided in the inside of the main body in a concave form. Further, the front side of the main body is provided with a semicircular frame to bring a face close to it.
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