Post-filter for speech synthesizing apparatus

Details Post-filter for speech synthesizing apparatus Post-filter for speech synthesizing apparatus

1994-06-03

1996-04-09

MacDonald, Allen R.

395 27, G01L 900

Patent

active

055069347

ABSTRACT:
A post-filter adapted to be used for a speech synthesizing apparatus includes a filtering unit for filtering a synthesized signal, and a scaling coefficient in accordance with both the synthesized signal and a signal output from the filtering unit. The post filter also includes an amplitude detecting unit for detecting an amplitude of the signal output from the filtering unit and for adjusting a value of the scaling coefficient in accordance with a detected result so that an amplitude of the signal output from the filtering unit is kept within a predetermined amplitude value. The post filter further includes a multiplier for calculating the filtering unit with the adjusted scaling coefficient.

REFERENCES:
patent: 4726037 (1988-02-01), Jayant
patent: 4969192 (1990-11-01), Chen et al.
patent: 5016279 (1992-05-01), Kawama et al.
Ira A. Gerson and Mark A. Jasuik, "Vector Sum Excited Linear Prediction (VSELP) Speech Coding at 8 KBPS", Proc. IEEE Int. Conf. ASSP, pp. 461-464 Apr. 1990.

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