1976-10-27
1978-02-28
Claffy, Kathleen H.
G10L 100
Patent
active
040769607
ABSTRACT:
Homomorphic speech processing apparatus utilizing CCD implementation of the CZT algorithm for performing DFT and IDFT operations in extracting representations of formants and/or pitch data from sampled speech inputs. Embodiments also are described for performing the DFT and IDFT operations (a) by generating n-transforms and averaging the result and (b) for performing a sliding CZT transform. In a further embodiment, a smoothed spectrum of vocal tract data is obtained using a CCD filter with a low pass response. The CCD implementation includes transversal filters employing split-electrode signal amplitude weighting.
REFERENCES:
patent: 3681530 (1972-08-01), Manley et al.
patent: 3715512 (1973-02-01), Kelly
J. Flanagan, "Speech Analysis, Synthesis and Perception," Springer-Verlag, 2nd Ed., 1972, pp. 175, 184, 361.
J. Markhoul, "Spectral Analysis of Speech," IEEE Trans. on Audio, vol. 21, No. 3, June 1973.
Buss Dennis D.
Hewes Charles Robert
Claffy Kathleen H.
Comfort James T.
Fassbender Charles J.
Hiller William E.
Kemeny E. S.
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