[Effects of speaking tube in patients with dysacousis]

Comparative study was made between the conventional speaking tube and the modern electric hearing aid. The results revealed that the conventional speaking tube was inferior to the electric hearing aid in terms of specificity to various frequencies, advantages and understanding of singular syllables, but almost equal to the latter in terms of understandings of three syllables. Actual comparison by listening with both revealed a face that the speaking tube was more acceptable than the hearing aid in terms of naturalness of voice heard with it. It was assumed that the advantages of the speaking tube like this may be attributable to the less sense closure of eyes as it had an open end and consequently to the better hearing through the speaking tube, which may have made better understandable conversation.