Multiplex communications – Generalized orthogonal or special mathematical techniques
Patent
1997-07-08
1999-10-19
Patel, Ajit
Multiplex communications
Generalized orthogonal or special mathematical techniques
375200, 375300, 375320, 455108, H04J 1100
Patent
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
Nagasaka Hiroyuki
Shinoda Atsushi
Shiraishi Kenichi
Suzuki Shoichi
Takegahara Toshiyuki
Kabushiki Kaisha Kenwood
Patel Ajit
Phunkulh Bob A.
Robinson Eric J.
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