載波 — 電信 — LexiconDream

〰️ 載波

一種透過調製傳遞訊息的波形。

載波是一種透過調製來承載訊息的波形。它是一種穩定的高頻訊號。載波本身不攜帶任何訊息。但當它的振幅、頻率或相位改變時，它就能承載數據。載波是載體，調製則是訊息。

載波廣泛應用於無線電、電視、Wi-Fi 和蜂窩網路。例如，一個廣播電台以固定頻率（例如 100.1 MHz）進行廣播，這就是載波。音頻訊號調製載波，接收器調諧到載波頻率並提取音頻訊號。如果沒有載波，訊號就無法有效地在空氣中傳播。

調製類型

載波必須夠強才能到達接收器。它們的頻率必須在接收器可以調諧的範圍內。它們不能幹擾其他載波。載波是無線通訊的基礎，其他一切都建立在其上。

Comments (3)

Terry Wells September 1, 2026

AM and FM radio use carrier waves differently. AM varies the amplitude, FM varies the frequency. Once you get that it all makes sense.
Jasmine K. June 6, 2026

So the carrier wave itself doesn't carry information, it's the modulation that does? The definition could be clearer on that.
Ed Norton January 23, 2026

Old school radio tech but still fundamental to how wireless communication works today.