| 摘要 |
<p>A highly simplified speech synthesizer that is capable of producing quality speech. The present speech synthesizer is adapted to be driven by an 8-bit digital input command word. Six of the bits are used for phoneme selection and the remaining two bits for inflection control. In a first, embodiment, the system if adapted to generate twelve parameter control signals for each phoneme, with one of the parameters being utilized to control both high and low frequency fricative injection into the vocal tract. This embodiment also provides asynchronous excitation of the vocal tract by including a second fricative excitation control circuit that is adapted to inject white noise in parallel into the second and third resonant filters under the control of the vocal amplitude control signal. In a second embodiment, one of the twelve signal parameters is utilized as two separate control signals thus effectively providing thirteen control signal parameters. The vocal tract in the second embodiment is also driven asynchronously with the glottal waveform being injected in parallel into both the first and second resonant filters. The second embodiment is also adapted to be operated off portable power supply.</p> |
