Speech synthesizing apparatus
US4075424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1976 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | Dec 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.