Patent ID: 7388959

Claim:
A harmonic generator and pre-amplifier circuit comprising: a modulator circuit coupled to receive an unfiltered BIPS (Buffered Input Program Signal) for generating harmonics and for providing a non-inverted and unfiltered MBIPS (Modulated Buffered Input Program Signal), a summing circuit for adding the BIPS and the MBIPS to provide a CMIPS (Composite Modulated Input Program Signal), and a pre-amplifier coupled to receive, to amplify and to condition the CMIPS to provide a COS (Composite Operating Signal), wherein the pre-amplifier comprises: an all-pass state variable filter coupled to receive the CMIPS and for providing a HFRCMIPS (High-Frequency Range Composite Modulated Input Program Signal), an MFRCMIPS (Mid-Frequency Range Composite Modulated Input Program Signal), and a LFRCMIPS (Low-Frequency Range Composite Modulated Input Program Signal), and a state-variable summing amplifier coupled to add the HFRCMIPS, the MFRCMIPS, and the LFRCMIPS to provide the COS.