DSB

Amplitude modulation of a carrier wave normally results in two mirror-image sidebands. The signal components above the carrier frequency constitute the upper sideband (USB), and those below the carrier frequency constitute the lower sideband (LSB). In conventional AM transmission, the carrier and both sidebands are present, sometimes called double sideband amplitude modulation (DSB-AM).

載波的幅度調製，通常將導致兩個鏡像邊帶。以上的載波頻率的信號分量構成的上邊帶（USB），和那些低於載波頻率構成的下邊帶（LSB）。在傳統的AM傳輸，載波和兩個邊帶都存在，有時也被稱為雙邊帶調幅（DSB-AM）。