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Ampliphase is the brand name of an amplitude modulation system achieved by summing phase modulated carriers. It was originally marketed by RCA for AM broadcast transmitters. == How it works == #The system takes a carrier frequency and splits it into two identical signals. #The signals are first phase shifted 135 degrees from each other (to provide a base power output with zero modulation from the transmitter). #Each signal is then phase modulated by the audio signal, one signal is positively phase modulated while the other is negatively phase modulated. #The two signals are then amplified to a desired power. #Finally, the two signals are summed in the final output filter stage of the transmitter. The result is that when the signals are closer in phase, the output amplitude is larger and when the signals are more out of phase, the output is lower. A complication is the necessity for a "drive regulator", which implementation is quite simple at 10 kW or lower levels, but is more complicated at higher levels. "Drive regulation" is most effective when the instantaneous power output approaches zero. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ampliphase」の詳細全文を読む スポンサード リンク
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