Differential demodulator

Details Differential demodulator Differential demodulator

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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Digital Sound Broadcasting to Vehicular, Portable, and Fixed Receivers for BSS (Sound) in the frequency range 500-3000 MHz, Document 10/30-E, 10 Dec. 1991.
Digital Sound Broadcasting to Mobile Receivers, Bernard Le Flock, Roselyne Halbert-Lassalle, Damien Castelain, IEEE Transactions on Consumer Electronics, vol. 35, #3 Aug. 1989.

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