Speech synthesizing apparatus

Details Speech synthesizing apparatus Speech synthesizing apparatus

1976-12-13

1978-02-21

Claffy, Kathleen H.

G10L 100

Patent

active

040754243

ABSTRACT:
Speech synthesizing apparatus is provided using digital coded values specifying parameters of a sound to be reproduced. The apparatus has a voiced sound generator using digital values specified by input parameters to represent three formant waveforms respectively which are sampled at substantially constant intervals, the parameters each expressing in relation to the sampling interval the frequency of the formant concerned. At each sampling, the input parameters are arranged to derive for each formant waveform respectively a value representative of the instantaneous amplitude of that waveform in relation to the others, the three values obtained then being combined to produce a resultant value representing an instantaneous amplitude output of a voiced sound component waveform. This output waveform is subjected to modification by attenuation and the addition, if required, of an unvoiced sound component before being passed through an analogue converter to a sound reproducing transducer. The sampling rate is chosen to produce a succession of outputs at sufficiently short intervals to approximate continuous speech after being subjected to a low pass filtering operation. The apparatus has provision for the interlaced sampling of a number of channels.

REFERENCES:
patent: 3102165 (1963-08-01), Clapper
patent: 3703609 (1972-11-01), Gluth
patent: 3746791 (1973-07-01), Wolf
patent: 3828132 (1974-08-01), Flanagan
patent: 3830977 (1974-08-01), Dechaux
patent: 3908085 (1975-09-01), Gagnon

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