Embodiments disclose a computer program product and computer readable medium for determination of a narrowing condition of a fistula by detection of audio signals and for use with a computer. When the computer program product is loaded, a first reference sample of a characteristics spectrogram of a fistula sound signal received ahead in a non-narrowed fistula and a second reference sample of a characteristics spectrogram of a fistula sound signal resulting received ahead in a narrowed fistula are obtained. The two samples are computed by using the Sprott’s chaotic system and a dynamic error is generated. The computer program product in the embodiment generalizes the dynamic errors by using the fuzzy set theory and a membership function and outputs the results in the forms of hue and saturation respectively showing the degree of vascular stenosis on a display screen and demonstrating its probability, which allow doctors and patients to make proper judgment.一種可藉音頻技術獲得瘻管窄化程度之程式產品以及儲存有所述程式產品之電腦可讀取媒體,所述程式產品適用於一電腦裝置,以於載入有該程式產品時,將事先接收自正常瘻管及窄化瘻管內的瘻管聲音訊號進行頻譜轉換,得到各自之特徵頻譜,作為正常樣本及窄化樣本。再將正常樣本與窄化樣本透過混沌同步理論進行計算,輸出一動態誤差。並利用歸屬函數將該動態誤差進行模糊-色彩推論之計算,並將結果轉換為色相(Hue,H),使該色相代表的色彩呈現於顯示介面,可表示窄化瘻管之窄化程度,並以飽合度(Saturation,S)表示之可信賴度,其方便醫師、患者直接了解結果。(11)‧‧‧正常樣本(12)‧‧‧窄化樣本(2)‧‧‧動態誤差ψ(31)‧‧‧主系統(32)‧‧‧僕系統(4)‧‧‧資料庫
