Experiment with Speechlike Phase in a Spectrally Flattened Pitch-Excited Channel Vocoder
Bernard Gold · The Journal of the Acoustical Society of America · 1964
The pitch-excited vocoder invented by Dudley can be greatly improved and, it appears, made to produce very natural speech by the inclusion of (a) very precise pitch extraction and buzz-hiss indication, (b) pre-modulation spectral flattening of the exciting signal, and (c) more speechlike phase. This paper outlines a technique that induces more speechlike phase in a spectrally flattened pitch-excited vocoder. Results obtained thus far from a computer-simulated vocoder are quite hopeful.