【摘要】 数字信号处理理论课中,通常以持续时间有限长的带限信号这种抽象假设的信号形式讲解基于离散傅立叶变换(DFT)的信号谱分析.然而,持续时间有限长的带限信号并不存在,这常常导致课堂教学中对DFT这种信号谱分析方法的教和学都成为难点.用学生所熟悉的心电图和皮肤电导生理信号的谱分析过程来分解DFT过程中的各个难点,可以有效地帮助学生理解和掌握离散傅立叶变换这种应用广泛的信号谱分析方法.更多还原

【Abstract】 A kind of supposed band-limited and time-limited signal was used in class of Digital Signal Processing to illustrate signal spectrum analysis based on the discrete Fourier transform.However,such band-limited and time-limited signal does not really exist,leading to the confusion of the students about how to apply DFT.It is helpful for the students to understand DFT by analyzing the spectrums of the Electrocardiography and the galvanic skin response signals.更多还原