Portable devices with audio capabilities necessitate the use of small transducers, often with poor frequency responses. This can be a limiting factor in the perception of the speech quality of VoIP services hosted on such a device. This paper seeks to investigate the problem and provide practical solutions through the use of appropriate enhancement technologies. The paper covers the use of equalization, dynamic range compression and psychoacoustic bass enhancement as possible methods for improving intelligibility. Subjective tests are used to evaluate the enhancements prior to making practical recommendations.
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