Patent ID: 7541959

Claim:
A high-speed signal processor which functions as a waveform acquisition system and a high-speed analog-to-digital converter, said processor comprising: a filter system, comprising an M-band filter bank, for dividing an input signal into a series of adjacent frequency bands; a frequency down converter for down converting one or more of the adjacent frequency bands, said frequency down converter comprising a single direct processing stage for each channel; a digitizer for digitizing each frequency band output from said frequency down converter; and a system for reconstructing the original input signal; wherein the single stage direction conversion process for each channel is performed using a digital local oscillator and wherein the M-band filters in said M-band filter bank enable perfect reconstruction, meaning that the cascaded response of the M-band analysis filters followed by the synthesis filters produces an overall flat amplitude response and group delay across all frequencies, with mirror image roll-off at filter boundaries and with the amplitude at the filter boundaries nominally about 6.02 dB below the constant peak values.