Voice synthesizer
First Claim
1. A voice synthesizer (FIG. 1) arranged with a memory (18) for storing basis functions (FIGS. 4A through 4L), each basis function including a set of data representing a speech waveform segment recorded at a basic storage rate and each basis function defining a waveform segment within a pitch period and including plural formants F1 and F2;
- the synthesizer BEING CHARACTERIZED BYeach basis function being represented by a data point plotted on a single line (46) on a chart having first and second formant log-log axes (FIG.
3), andmeans (11, 12, 13, 15, 20, 30, 31, 32, 33, 36, 40,
41) for producing a speech waveform segment within the pitch period and approximately representing a data point located off of the single line (46) on the chart by selecting and reading out of the memory (18) in the pitch period one of the basis functions at a rate different than the basic storage rate.
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Abstract
The speech synthesizer minimizes storage requirements by storing basis functions each defining a waveform segment or phoneme within a pitch period and including formants F1 and F2, featuring readin at one rate and readout at different rates within the pitch period. The synthesizer is characterized by each basis function being represented by a data point plotted on a single line on a chart having first and second formant log-log axes and means for producing a speech waveform segment approximately representing any desired point located off of the single line on the chart by selecting and reading out of the memory one of the basis functions at a rate different than the basic storage rate.
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Citations
6 Claims
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1. A voice synthesizer (FIG. 1) arranged with a memory (18) for storing basis functions (FIGS. 4A through 4L), each basis function including a set of data representing a speech waveform segment recorded at a basic storage rate and each basis function defining a waveform segment within a pitch period and including plural formants F1 and F2;
- the synthesizer BEING CHARACTERIZED BY
each basis function being represented by a data point plotted on a single line (46) on a chart having first and second formant log-log axes (FIG.
3), andmeans (11, 12, 13, 15, 20, 30, 31, 32, 33, 36, 40,
41) for producing a speech waveform segment within the pitch period and approximately representing a data point located off of the single line (46) on the chart by selecting and reading out of the memory (18) in the pitch period one of the basis functions at a rate different than the basic storage rate. - View Dependent Claims (2, 3, 4, 5)
- the synthesizer BEING CHARACTERIZED BY
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6. A voice synthesizer arranged with a memory for storing basis functions, each basis function including a set of data representing a speech waveform segment recorded at a basic storage rate and each basis function defining a waveform segment within a pitch period and including plural formants F1 and F2;
- the synthesizer being characterized by
means for reading out the basis functions at a readout rate that is varied from pitch period to pitch period, different readout rates producing different speech waveform segments within the pitch period and including formants F1 and F2.
- the synthesizer being characterized by
Specification