| 摘要 |
PURPOSE:To synthesize a voice with good quality without increasing the number of data by dividing the sectional area of an acoustic tube which simulates the voice tube of a human roughly at the part corresponding to the inner part of the throat, and controlling the part corresponding to the lips closely. CONSTITUTION:Acoustic tubes S1-S4 corresponding to the inner part of the throat are regarded as one acoustic tube of 4cm pitch, whose intervals are controlled with the same data. Similarly, the pitch is decreased stepwise so that S5-S7 are 3cm, S8-S9 are 2cm, and the subsequent part is 1cm; and the parts of acoustic tubes S12-S17 corresponding to the mouth and lips are formed by dividing finely acoustic tubes corresponding to the parts where the sectional area variation of the voice tube is large like 1cm, 0.5cm or 0.2cm. Then a delay block ZD is normalized at 1cm pitch and interposed between the equivalent circuits of two adjacent acoustic tubes. Consequently, even when the number of divisions of a variable sectional area acoustic tube close to the throat is decreased, a voice which is close to a natural word is synthesized and when the quantity which is decreased nearby the throat is increased on the lip side, the voice which is close to the natural word is obtained without increasing a memory. |
