常見(jiàn)例句雙語(yǔ)例句First, a low frequency tone is up-converted to the needed frequency range by means of SSB(single side band modulation).其思路是將信號(hào)先通過(guò)單邊帶調(diào)制，將較低頻率調(diào)制到需要的頻率範(fàn)圍；A fast and accurate estimation technique of frequency and initial phase of single tone signal based on the phase of the DFT spectrum is proposed.提出一種新的基於DFT相位的正弦波信號(hào)頻率和初相的高精度估計(jì)方法。 返回 single frequency tone