Abstract
One common configuration of a vibrotactile sensory aid for the hearing impaired is the vocoder scheme employing a bank of bandpass filters that model human audition. These systems result in 16 or more spectral energy outputs, each of which drives a vibrator. Although successful in laboratory and classroom settings, the large number of vibrators required makes the implementation of wearable versions difficult. By performing a principal components analysis of the filter bank outputs, the spectral information can be recorded in as few as four parameters. A compact principal components analysis system has been implemented using digital signal‐processing techniques. The system consists of a 1/3‐oct bandpass filter bank, high‐speed energy detectors for each filter, logarithmic scaling of spectral energies, and a principal component calculator, all in software running on a commercial DSP microchip. In this paper, the principal components system is compared to the traditional vocoder method, as well as to the pitch and formant extraction schemes.
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