5.3. 1 Amplitude modulation and demodulation ere Asamplitude of signal -frequency of signal Ac amplitude of carrier o-frequency of carrier The frequency oc is greater(usually considerably greater) than @s. Attention should be paid to that the modulated signal is in phase with the carrier for the positive half cycle of the modulating signal, whereas the modulated signal is in opposite phase with the carrier for negative half cycle of the modulating signal5.3.1 Amplitude modulation and demodulation where As=amplitude of signal ωs=frequency of signal Ac=amplitude of carrier ωc=frequency of carrier The frequency ωc is greater (usually considerably greater) than ωs . Attention should be paid to that the modulated signal is in phase with the carrier for the positive half cycle of the modulating signal, whereas the modulated signal is in opposite phase with the carrier for negative half cycle of the modulating signal