Demodulators – Phase shift keying or quadrature amplitude demodulator
Patent
1995-12-11
1998-10-20
Chin, Wellington
Demodulators
Phase shift keying or quadrature amplitude demodulator
375324, 375244, 375261, 375320, H04L 2714, H04L 2722
Patent
active
058252410
ABSTRACT:
A differential demodulator that is particularly suited for a digital audio broadcasting (DAB) system, and more particularly to the Eureka-147 (DAB) system, is disclosed. The differential demodulator of the present invention receives complex data components I and Q derived from a fast fourier transform operation and converts the data components I and Q into differential data components .DELTA.I and .DELTA.Q that are accepted by data demodulating elements of the Eureka-147 system so as to be reconstructed as digital data which, in turn, are converted into an analog form that is converted and reproduced into corresponding high quality sound. The conversion of I and Q data into .DELTA.I and .DELTA.Q data is accomplished via a network of four ROMs and one RAM, wherein the ROMs are time-shared between the multiple carriers of the Eureka-147 system.
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Beale Terrance Ralph
McDanell Roger Alan
Chin Wellington
Corrielus Jean B.
Delco Electronics Corporation
Funke Jimmy L.
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