Sadhukhan A K, Goswami A, Kumar A, Gupta S
Netaji Subhas National Institute of Sports, SAI, Patiala, India.
Electromyogr Clin Neurophysiol. 1994 Apr-May;34(3):159-63.
During digitization of surface EMG, the signal is converted by an Analog-to-Digital (A/D) convertor at a specific sampling rate. This sampling rate should be selected cautiously because a high rate may include noise signals and a low rate may lead to errors. The present study was undertaken to show the effect of sampling rate on EMG power spectrum. The study was carried out on nine subjects and EMG record was done from deltoid muscle at sampling rates of 4, 6, 8 and 10 KHz during maximal voluntary contraction. Biopotential coupler with a response range of 5 Hz to 2 KHz was used during recording of the EMG signal which was processed later by Fast Fourier Transform software. The study showed a linear relationship between the sampling rate and the mean power frequency (MPF). But there was no distinct effect of sampling rate on mean and root mean square (RMS) of the digitized signal.
在表面肌电图数字化过程中，信号由模数（A/D）转换器以特定采样率进行转换。该采样率应谨慎选择，因为高采样率可能包含噪声信号，而低采样率可能导致误差。本研究旨在展示采样率对肌电图功率谱的影响。该研究对9名受试者进行，在最大自主收缩期间，以4、6、8和10千赫兹的采样率从三角肌记录肌电图。在记录肌电图信号期间使用了响应范围为5赫兹至2千赫兹的生物电位耦合器，该信号随后由快速傅里叶变换软件进行处理。研究表明采样率与平均功率频率（MPF）之间存在线性关系。但采样率对数字化信号的均值和均方根（RMS）没有明显影响。
