G - Physics – 06 – F
Patent
G - Physics
06
F
354/47
G06F 3/16 (2006.01)
Patent
CA 1216673
A Text to Speech System Abstract of the Disclosure The present system employs a microprocessor to accept ASCII signals representing text and transforms the same into coded signals representing phonemes, according to Hunnicutt rules for such transformation. The microprocessor is programmed to generate a plurality of parameters (16 bit values every 6.4 milliseconds in a preferred embodiment) in accordance with the phoneme sequence for the text. The parameters, which include mathematical considerations of the phoneme properties, are transmitted to a high speed digital signal processor whereat they are used to control multiplications and additions in doing programmed simulations of certain equations, thereby providing a digitized glottal waveform. The digitized glottal waveform at this step of the operation includes sufficient information to provide 40,000 samples per second, in a preferred embodiment. Thereafter the high speed digital signal processor subjects said digitized glottal waveform to a programmed low pass filtering operation to remove components of signals having frequencies in excess of five kilohertz and to provide some averaging of temporally adjacent values. Next the present system subjects the low pass filtered, digitized glottal waveform to down sampling, in a preferred embodiment, at the rate of 10,000 samples per second. The down sampled digitized waveform is then combined, under the guidance of a program, with a digitized waveform of aspiration sounds and then filtered by a set of digital resonators and this filtered combination is further combined with a waveform representing frication sound. This last described digital waveform is transmitted to a digital to analog converter to provide an analog waveform (spoken version) of the text.
469939
Digital Equipment Corporation
Moffat & Co.
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