Đang chuẩn bị liên kết để tải về tài liệu:
AM – DSB-SC (double sideband suppressed carrier)

Modulator the modulated signal .AM – DSB-SC (double sideband suppressed carrier) Spectrum M ( f ) = F [m(t )] S ( f ) = F [m(t ) cos(2π f 0 t )] = F [m(t )] ∗ F [cos(2π f 0 t )] = = M ( f ) ∗ 1 [δ ( f − f 0 ) + δ ( f + f 0 )] = 2 = 1 M ( f − f0 ) + 1 M ( f + f0 ) 2 2 .AM – DSB-SC (double sideband suppressed carrier) fM Power of the modulating signal P= ∫ | M ( f ) |2 df S =. | AM - DSB-SC double sideband suppressed carrier Modulator the modulated signal AM - DSB-SC double sideband suppressed carrier Spectrum M f F m t 5 f F m t cos 2nfot F m t F cos 2nfot M f f f -fo S f fo i M f - f o ị M f f o AM - DSB-SC double sideband suppressed carrier fM Power of the modulating signal P J IM f I2df - fM Power of the modulated signal DSB-SC s JI s f I2 df 1P 1P ị P if the amplitude of the carrier signal 1