APPARATUS AND METHOD FOR CONVERTING ONE SAMPLE PER SYMBOL PCM DATA TO A ONE SAMPLE PER SYMBOL DC CENTERED COMPLEX SIGNAL

摘要

Digital VSB modulator 200, a modulator-sampled data stream to successive PCM symbol signal samples of 1 sample per symbol progress is applied as a modulating signal. Sample carrier stream (302) to occur in a signal sample rate is applied as a carrier input to the modulator (300-S). Carrier stream, for example, (1, -1, -1, 1) to 4 samples the sample value repeat - consists of a sequence. The output of the modulator (300-S) is a real center is fitted to the DC value of the sample is applied to a bifurcated multiplexed N- tap root Nyquist FIR filter 306, the FIR filters, one sample per symbol ( ± R) to generate an aligned centered on the DC values ​​of the samples of 1 sample per symbol, and the sampled data output stream imaginary (± I) Chemistry branch having a sampled data output stream complex VSB output signal.