Patent ID: 8610514

Claim:
A full spectrum modulator comprising: a plurality of parallel channel processing paths, each path having (i) a first filter for pulse shaping an input channel signal and upsampling a channel frequency thereof, (ii) an interpolator for interpolating the output of said first filter to a common sample rate, and (iii) a decimator for centering the output of said interpolator on a predetermined channel bandwidth that is related to said sample rate; said parallel channel processing paths comprising a direct digital synthesizer (DDS) coupled between said interpolator and said decimator to add a carrier offset to signals input to said decimator from said interpolator; an Inverse Discrete Fourier Transform (IDFT) processor coupled to receive channel signal outputs from the decimators of said plurality of parallel channel processing paths; a complex to real signal processor coupled to receive IDFT processed parallel channel signals from said IDFT processor and convert complex signals to real signals to obtain converted parallel channel signals; a polyphase filter bank coupled to receive the converted parallel channel signals from said signal processor; a commutator for converting the converted parallel channel signals from said polyphase filter bank to a single stream of data; and a second filter for upsampling the single stream of data to a fixed output sampling rate and for low pass filtering alias signals therein.