1. A system that improves speech intelligibility and speech quality of a speech segment comprising: one or more processors or circuits including: a background noise processor programmed to detect and model a background noise from an input comprising a plurality of signals; a signal-to-noise processor programmed to approximate a signal-to-noise ratio of at least one of the plurality of signals; and an articulation index processor programmed to approximate an articulation index of the at least one of the plurality of signals processed by the signal-to-noise processor; wherein a shaping processor adjusts a spectrum of the at least one of the plurality of signals, based on a comparison of the articulation index to a plurality of predetermined thresholds.