Morley J W, Crawford E N, Ferrington D G, Archer J S, Turman A B, Rowe M J
School of Physiology and Pharmacology, University of New South Wales, Sydney, Australia.
J Neurosci Methods. 1991 Jun;38(1):47-50. doi: 10.1016/0165-0270(91)90153-q.
A method is described utilizing computer-generated sine wave data and purpose-built hardware to generate a complex vibrotactile stimulus. Two sine waves of different frequency were summed to produce a complex waveform with two temporal components, a high frequency component and a low frequency beat component. The computer-generated data points for each of the two component sine waves were downloaded to two banks of static memory in a dual synchronous arbitrary function generator. The data points in memory were fed to two 12-bit digital-to-analogue converters which sent the two analogue sine wave signals to a summing amplifier where the two sine waves were added. This method provides a complex waveform that can be gated on and off, has a fixed frequency ratio of the component sine waves and no phase drift between the component waves. Addition of the separate sine waves in a summing amplifier allows for easy alteration of the amplitude ratio of the sine waves. The output of the summing amplifier is sent to a feedback controlled mechanical stimulator, thereby allowing the stimulus to be presented to the skin of human subjects and experimental animals.
本文描述了一种利用计算机生成的正弦波数据和特制硬件来产生复杂振动触觉刺激的方法。将两个不同频率的正弦波相加，以产生一个具有两个时间成分的复杂波形，即高频成分和低频拍频成分。两个分量正弦波各自的计算机生成数据点被下载到一个双同步任意函数发生器中的两组静态存储器中。存储器中的数据点被馈送到两个12位数字模拟转换器，这两个转换器将两个模拟正弦波信号发送到一个求和放大器，在那里两个正弦波相加。该方法提供了一种可以进行通断控制的复杂波形，其分量正弦波具有固定的频率比，且分量波之间没有相位漂移。在求和放大器中对单独的正弦波进行相加，便于改变正弦波的幅度比。求和放大器的输出被发送到一个反馈控制的机械刺激器，从而能够将刺激施加到人类受试者和实验动物的皮肤上。
