The present invention relates to a measurement circuit for heart rate variability, which uses a measurement circuit for photoplethysmographic (PPG) signal to measure an ear and produces a first measured signal, a measurement circuit for electrocardiographic (ECG) signal to measure a second measured signal, an audio processing unit to produces a sound signal, a control and processing unit for controlling the audio processing unit to play the sound signal, for receiving the first measured signal to produce a corresponding first waveform diagram, and for receiving the second measured signal to produce a corresponding second waveform diagram. Thereby, nervousness and impatience of a person under test can be eliminated, and hence the real heart rate variability of the person under test can be measured.本發明係有關於一種心律變異度之量測電路,其由一光體積描記訊號量測電路量測一人耳而產生一第一量測訊號;一心電圖訊號量測電路量測一人體之生理狀態而產生一第二量測訊號;一音訊處理單元產生一聲音訊號,並傳送該聲音訊號至該人耳;一控制處理單元用以控制該音訊處理單元播放該聲音訊號,並接收該第一量測訊號而對應產生一第一波形圖,且該控制處理單元接收該第二量測訊號而對應產生一第二波形圖。如此,本發明藉由撥放聲音訊號以避免受測者將注意力集中在光體積描記訊號量測電路或心電圖訊號量測電路上,以消除受測者的緊張或者不耐煩,如此可真實量測受測者之實際的心律變異。10...光體積描記訊號量測電路12...光體積描記訊號量測單元14...光體積描記訊號處理單元20...心電圖訊號量測電路22...心電圖訊號量測單元24...心電圖訊號處理單元30...音訊處理單元40...控制處理單元80...第一儲存單元90...液晶顯示器100...第二儲存單元110...USB傳輸模組
