Abstract
A constant-Q spectrum analyzer was implemented digitally, using the Fourier-Mellon transform, to synthesize spectrally manipulated speech signals for audible and visual display and especially to produce frequency-transposed speech as an aid for the deaf. The work reported here was to assess the quality and intelligibility of sounds consisting of low-pass-filtered speech plus one "sine" wave, representing the high-frequency information, superimposed upon it. One-eighth-octave filters were used for analysis, and the one having the highest output was chosen to be transposed down in frequency. The general problem of synthesis where the high-frequency information comes at a higher rate than the low-frequency information will be discussed. A comparison of the visual patterns produced with linear- and logarithmic-frequency analysis will be shown and inferences drawn as to the extraction of transient speech information. Interference between the transposed second formant and the untransposed first formant will be illustrated. Preliminary tests of the intelligibility of diagnostic rhyming words incorporated in common phrases will be reported.
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