Two kinds of typical wideband signal , frequency modulation ( fm ) signal and frequency spread signal , is analyzed qualitatively with wideband ambiguity function 以寬帶模糊度函數(shù)為工具定性地分析了兩類典型寬帶信號,即調(diào)頻信號和頻率分集信號。
Digital sound broadcasting is a general term covering a wide range of systems and technologies , including eureka 147 and isdb - t , which are designed to replace frequency modulation ( fm ) broadcasting , digital radio mondiale ( drm ) , a possible successor to amplitude modulation ( am ) , as well as iboc , which is intended to complement the existing am and fm services 數(shù)碼聲音廣播?是一個(gè)統(tǒng)稱,技術(shù)上是分為不同的系統(tǒng)和制式,有取代fm廣播的eureka147和isdb - t ,也有針對am廣播的drm ,和可以與amfm并存的iboc等系統(tǒng),它們都有一個(gè)共通點(diǎn),是現(xiàn)時(shí)的收音機(jī)并不適用。