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Dual mode amplitude modulation transmit two signals over an AM carrier.

Patent application no. - 3302/MUM/2010


This invention relates to amplitude modulation used in electronic communication devices. Existing method of amplitude modulation employs change in amplitude of a carrier signal with respect to amplitude of a modulating signal. In this method amplitude of carrier signal is modulated on positive and negative side of carrier wave and both sides carry same modulating signal.

The new method of modulating two different modulating signals on one carrier comprises of a device that modulates one modulating signal on positive side of the carrier wave and another signal on negative side of a carrier wave before transmission.



A receiver comprises of two de-modulators to retrieve the two signals transmitted on one carrier wave.
Each de-modulator demodulates different signal providing outputs of two signals those were modulated at the time of transmission