断开延迟时间;
Because the presenting epoch of target symbol of every key was different each delayed 100 ms in turn we could determine which key was selected by the time delay of extracted features.
由于每个按键对应的诱发符号呈现的时间间隔不同,依次相隔100ms,因此,从提取特征信号出现的时刻,就知道用户盯住的是哪个按键。
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