DDS-based modulation products are an alternative scheme to the more traditional transmit DAC approach for quadrature digital upconversion in modern communications systems.是什么意思_DDS-based modulation products are an alternative scheme to the more traditional transmit DAC approach for quadrature digital upconversion in modern communications systems.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句