Patent ID: 6229464
Filing Date: 2001-05-08
Classification: H04L

Abstract:
Apparatus including a 1-sample-per-symbol pulse-code-modulation (PCM) DC-centered vestigial-sideband (VSB) converter, comprising:first means responsive to an ongoing sampled data stream of 1-sample-per-symbol successive PCM symbol samples applied as an input thereto at a rate of a given sampling frequency for deriving, at said rate of said given sampling frequency, an ongoing DC-centered real (.+-.R) sampled data output stream of 1-sample-per-symbol sample values, wherein each sample value in any sequence of 4 successive 1-sample-per-symbol sample values of said sampled data output stream corresponds to a different one of the 4 quadrants of a cycle of an ongoing data-modulated cosine wave; anda bifurcated multiplexed N-tap root Nyquist FIR filter, responsive to said .+-.R sampled data output stream from said first means, for deriving, as complex outputs therefrom, respective DC-centered real (.+-.R)and imaginary (.+-.I) sampled data output streams of 1-sample-per-symbol sample values.