Apparatus for demodulating AM data multiplexed modulated wave si

Multiplex communications – Generalized orthogonal or special mathematical techniques

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375200, 375300, 375320, 455108, H04J 1100

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active

059700467

ABSTRACT:
An apparatus for demodulating an AM data multiplexed modulated wave signal in which an analog modulated signal and digital modulated signals are multiplexed, in order to derive therefrom a baseband digital signal. The demodulation apparatus aims to derive the digital baseband signal from the AM data multiplexed modulated wave signal in which the analog modulated signal obtained by amplitude modulating a carrier having a frequency fc with an analog signal and the digital modulated signals at frequency position of (fc+f.alpha.) and (fc-f.alpha.) line-symmetrical with respect to a frequency axis of the frequency fc are multiplexed. A demodulation apparatus includes an AM type modulated wave signal eliminating circuit for removing an AM modulated wave signal from an input AM data multiplexed modulated wave signal, and a data demodulation circuit for receiving an output of the AM type modulated wave signal eliminating circuit and for deriving therefrom a baseband digital signal.

REFERENCES:
patent: 5471464 (1995-11-01), Ikeda
patent: 5559828 (1996-09-01), Armstrong et al.
patent: 5581578 (1996-12-01), De Bot

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