A detecting method and apparatus for blood oxygen saturation under motion interference condition are introduced herein. The method includes: (A) collecting individually time domain pulse signals for red light and near-infrared light, and separating AC signals therefrom (B) by a noise-reducing method according to the present invention reducing noises from the AC signals of red light and near-infrared light to eliminate a motion interference energy of the AC signals (C) calculating a ratio for time domain energies of the AC signals of red light and near-infrared light being noise reduced and (D) calculating the blood oxygen saturation based on the ratio of the time domain energies. The present invention obtains the higher accurately blood oxygen saturation under motion condition by calculating the ratio of AC signals with the ratio of time-domain energies. This creates a easier algorithm and beneficial for miniaturing hardware, as well as implementing a function of anti-motion interference in minature portable oxygen meters.本發明提供一種在具有運動干擾條件下的血氧飽和度檢測方法及裝置。該方法包括:(A)分別採集紅光和近紅外光波段的脈搏波時域信號,並分離出交流信號;(B)採用本發明的降噪方法分別對紅光和近紅外光波段的該交流信號進行降噪,消除該交流信號中的運動干擾能量;(C)計算降噪後的紅光和近紅外光交流信號之時域能量的比值;(D)根據所獲得的時域能量比值計算血氧飽和度。本發明透過時域能量比值計算交流比值,得到運動情況下較高精度的血氧飽和度,所需演算法較簡單,利於硬體小型化,可在小型可擕式血氧儀中實現抗運動干擾功能。S410‧‧‧分別採集紅光和近紅外光波段的脈搏波時域信號,並分離出交流信號S421‧‧‧計算所述交流信號的初始時域能量ES422‧‧‧根據預設的一第一濾波範圍對所述交流信號進行濾波S423‧‧‧計算濾波後的所述交流信號的第一時域能量E1S424‧‧‧判斷E1與E的比值是否大於一預先設定的第一閾值M1,若E1/E小於或等於M1,則干擾頻率能量被消除,信號的降噪完成S430‧‧‧計算降噪後的紅光交流信號時域能量和近紅外光交流信號時域能量的比值S440‧‧‧根據所獲得的時域能量比值計算血氧飽和度
