A NOVEL DEMODULATION METHOD AND APPARATUS

摘要

A demodulator apparatus for demodulating a data bearing broadcast signal in the absence of mixers and without incurring quantization errors. The apparatus incorporates a receiver for receiving a broadcast signal and producing therefrom a predetermined intermediate carrier frequency (FIF), transversal filter (32-39N) connected to receive the intermediate carrier frequency FIF has N active stages and tap weight means at each of said stages for entering a tap weight sequence to yield maximum correlation energy when desired alignment occurs to thereby make phase and frequency agreement between local timing and the received signal, and the frequency FIF is sampled at a clock rate (Fs) of: Fs = 4FIF/K wherein FIF is the intermediate frequency and K is a scaling factor which is related to the number of carrier cycles per stage, the transversal filter includes a charge coupled device (42) having the N active stages.