Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Patent
1993-09-10
1996-03-05
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
375285, 375296, 375302, 455 43, 455 63, 455 76, 455110, 332126, 331 16, 331175, 327 39, 327 58, 327105, H03K 706, H03K 906
Patent
active
054973996
ABSTRACT:
A digital FM modulating apparatus includes a device for restricting modulation data between a lower limit data value and an upper limit data value which respectively correspond to a minimum allowable frequency and a maximum allowable frequency value of an FM modulated signal. The apparatus also includes a device for suppressing transitional variance in the restricted modulating data and a direct digital synthesizer for receiving the suppressed data and producing synthesized data corresponding to the FM modulated signal.
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Hamada, M., et al, "Design of a Digital FM Modulator for Satellite Broadcasting Earth Stations", 14th AIAA International Communication Satellite Systems Conference & Exhibit, Washington, D.C., Mar. 22-26, 1992, pp. 1702-1713.
Chin Stephen
Le Amanda T.
NEC Corporation
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