3. A system for adjusting a voice intelligibility enhancement, the system comprising: an analysis module configured to obtain a spectral representation of at least a portion of an input audio signal, the spectral representation comprising one or more formant frequencies; an inverse filter configured to be applied to the input audio signal to obtain an excitation signal; a formant enhancement module configured to generate an enhancement filter configured to emphasize the one or more formant frequencies, wherein the enhancement filter is configured to decrease a distance between line spectral pairs of at least one formant frequency and thereby increase a gain of a spectral peak associated with the at least one formant frequency; the enhancement filter configured to be applied to the excitation signal with one or more processors to produce a first modified voice signal, the enhancement filter further configured to be applied to the input audio signal with the one or more processors to produce a second modified voice signal; a combiner configured to combine at least a portion of the first modified voice signal with at least a portion of the second modified voice signal to produce a combined modified voice signal; a temporal enveloper shaper configured to apply a temporal enhancement to one or more time domain envelopes of the combined modified voice signal with the one or more processors to produce an output signal, the temporal enhancement configured to emphasize peaks in the one or more time domain envelopes by increasing a slope of the peaks to thereby emphasize one or more consonant sounds in the combined modified voice signal; and an output module configured to output the output signal for playback.
3. A system for adjusting a voice intelligibility enhancement, the system comprising: an analysis module configured to obtain a spectral representation of at least a portion of an input audio signal, the spectral representation comprising one or more formant frequencies; an inverse filter configured to be applied to the input audio signal to obtain an excitation signal; a formant enhancement module configured to generate an enhancement filter configured to emphasize the one or more formant frequencies, wherein the enhancement filter is configured to decrease a distance between line spectral pairs of at least one formant frequency and thereby increase a gain of a spectral peak associated with the at least one formant frequency; the enhancement filter configured to be applied to the excitation signal with one or more processors to produce a first modified voice signal, the enhancement filter further configured to be applied to the input audio signal with the one or more processors to produce a second modified voice signal; a combiner configured to combine at least a portion of the first modified voice signal with at least a portion of the second modified voice signal to produce a combined modified voice signal; a temporal enveloper shaper configured to apply a temporal enhancement to one or more time domain envelopes of the combined modified voice signal with the one or more processors to produce an output signal, the temporal enhancement configured to emphasize peaks in the one or more time domain envelopes by increasing a slope of the peaks to thereby emphasize one or more consonant sounds in the combined modified voice signal; and an output module configured to output the output signal for playback. 18. The system of claim 3 , wherein the combiner is configured to add at least a portion of the first modified voice signal with at least a portion of the second modified voice signal to produce the combined modified voice signal.