名詞 low frequency:

1. 30 to 300 kilohertz
   同義詞：LF
2. a pitch that is perceived as below other pitches
   同義詞：low pitch

1. In electronics, undesirable low frequency currents interfering with a desired signal, and usually caused by a poorly screened alternating mains supply.
   在電子學(xué)領(lǐng)域，一種不希望發(fā)生的低頻電流，它干擾所要求的信號。通常這種現(xiàn)象是由于交流供電線路屏蔽不良引起的。
2. 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(jìn)行信號取樣時出現(xiàn)的一種效應(yīng)，即當(dāng)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。