Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1983-04-13
1987-09-22
Kemeny, E. S. Matt
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
G10L 500
Patent
active
046960384
ABSTRACT:
This voice messaging system provides an LPC analyzer in combination with a pitch extractor wherein LPC parameters and a residual signal organized in a sequence of speech data frames are provided by the LPC analyzer as an output representative of an analog speech signal. The pitch extractor is operably associated with the LPC analyzer and produces a plurality of pitch candidates for each of the speech data frames in the sequence thereof. Dynamic programming is performed on the plurality of pitch candidates for each speech data frame and also with respect to a voiced/unvoiced decision of the speech data for each frame by tracking both pitch and voicing from frame to frame to provide an optimal pitch value and also an optimal voicing decision. During dynamic programming, a cumulative penalty for a sequence of frame pitch/voicing decisions is accumulated by defining a transition error between each pitch candidate of a current speech data frame and each pitch candidate of the preceding frame, and defining a cumulative error for each pitch candidate of the current frame equal to the transition error between the pitch candidate of the current frame plus the cumulative error of an optimally identified pitch candidate in the preceding frame to locate the track providing optimal pitch and voicing decisions based upon the lowest cumulative penalty. An encoder then encodes the LPC parameters as generated by the LPC analyzer and the optimal pitch and voicing decisions for each speech data frame for subsequent use in providing an audible synthesized speech output substantially identical to the original speech input.
REFERENCES:
patent: 4004096 (1977-01-01), Bauer et al.
patent: 4282405 (1981-08-01), Taguchi
patent: 4561102 (1985-12-01), Presas
L. Rabiner and R. Schafer, Digital Processing of Speech Signals, Bell Laboratories, 1978, pp. 396-450, pp. 138-141.
ICASSP 82, IEEE International Conference on Ascoustics, Speech and Signal Processing, May 3-5, 1982, Paris, FR, vol. 1, pp. 172-175, IEEE, N.Y., U.S.; B. Secrest.
Doddington George R.
Secrest Bruce G.
Hiller William E.
Kemeny E. S. Matt
Merrett N. Rhys
Sharp Melvin
Texas Instruments Incorporated
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