名詞 high frequency:

1. 3 to 30 megahertz
   同義詞：HF
2. a pitch that is perceived as above other pitches
   同義詞：high pitch

1. An effect that occurs when a signal is sampled at a rate less than twice the highest frequency present in the signal.The subsequent signal recovered from the samples will not contain the high frequency component of the original signal and will display a false low frequency signal.
   以低于信號中最高頻率兩倍的頻率進行信號取樣時出現(xiàn)的一種效應(yīng)，即當由取樣狀態(tài)還原時，還原后的信號將不再含有原來信號中的高頻成分，并將顯示出虛假的低頻信號。