羽球拍中心點、3點鐘與9點鐘位置撞擊聲音基頻之比較

A BASE FREQUENCY COMPARISON OF HITTING VOICES FROM BADMINTON RACQUET CENTER POINT%2C 3 O'CLOCK AND 9 O'CLOCK POSITION

網線張力和擊球表現(球體碰撞後的反彈速度)有關，而球體撞擊球拍聲音的基頻則和網線張力有關。基於如此，本研究針對羽球撞擊羽球拍中心點、3點鐘與9點鐘位置的撞擊聲音基頻進行比較，進而了解以這些球拍位置擊球對於擊球表現的影響。實驗使用Audacity聲音編輯軟體針對羽球頭撞擊羽球拍(穿至20磅)的聲音進行錄製並分析該聲音的基頻。結果顯示羽球拍中心點聲音基頻顯著大於3點鐘與9點鐘位置聲音基頻(p<.05)，至於3點鐘與9點鐘位置聲音基頻則無顯著差異。因此在實際擊球時可以要求擊球者儘量以接近球拍中心的位置擊球；而對於左、右手持拍者來說，以9點鐘位置和3點鐘位置來擊球，在擊球效果上並無顯著差異。

String tension was related with the performance when racquet hitting sphere (the rebounding velocity of sphere after sphere hitting racquet). Moreover， the base frequency of hitting voice (BFOHV) when sphere hitting racquet was related with string tension. Based on these phenomena， BFOHV on badminton racquet center point， 3 o’clock and 9 o’clock position were compared. Then， the effect of using these racquet stringbed positions to hit sphere on the hitting performance could be comprehended。In experiment， Audacity audio edit software was used to record hitting voice and to analyze BFOHV (racquet string was tensed to 20 pounds). Results showed the BFOHV on center point position was bigger significantly than the BFOHV on 3 o’clock and 9 o’clock position (p