| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for amplifying a low frequency generated in a free hand mode by a receiver, which has the compound function (receiver, speaker and buzzer) of a telephone set 1, for allowing a leak in a discrete. SOLUTION: In this method, a pipe 9 protruded inside a cavity 3 of a case 2 of a telephone set 1 is attached around an opening part 8 communicating the outside of the case and the cavity 3. Such a telephone set has the free hand mode together with a high sound quality and is provided with a compound function type receiver for allowing the leakage in the discrete.
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