Abstract: Reducing the peak-to-average power ratio of a signal comprises receiving the input signal, where the input signal is associated with at least one unacceptable frequency range. The input signal is clipped about an amplitude range to yield a clipped signal and clipped information, where the clipped information represents intermodulation products. The clipped information is filtered to yield an error signal. The error signal represents a subset of the intermodulation products, where an intermodulation product of the subset corresponds to the unacceptable frequency range. The error signal is subtracted from the input signal to yield an output signal.

Abstract: A dry gas seal for turbo machinery and the like includes a rotating shoulder and mating stationary face seal forming a seal between an associated shaft and outer housing. The shoulder is supported in a segmented holder having a machined shroud in which the shoulder is retained, and a rotor mounted on the shaft and detachably connected with the shroud to facilitate machining the shroud when disassembled from the rotor. The face seal is supported in a segmented housing having a machined first member mounted in the stationary outer housing and retaining an inside portion of the face seal, and a second member retaining an outside portion of the face seal and being detachably connected with the first member to facilitate machining the first member when disassembled from the second member.