Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1982-06-25
1985-05-28
Kemeny, E. S. Matt
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 43, 381 53, G10L 100
Patent
active
045204993
ABSTRACT:
A reconfigurable lattice filter is employed to permit the same circuitry to function as a speech synthesizer and as a speech analyzer or recognizer. The lattice filter can be configured both as an all-pole filter (for synthesis) and as an all-zero filter (for analysis), with the choice being determined by the state of an analysis/synthesis signal (i.e., mode control signal) provided thereto. The connections between various elements in the circuitry are controlled by the analysis/synthesis signal, also.
In synthesis mode, partial correlation coefficients are supplied to the filter from a microprocessor. The filter is excited by a one of a number of stored patterns simulating a glottal pulse for voiced sounds and by a pseudo-random noise generator for unvoiced sounds.
In analysis mode, appropriate feedback control paths are enabled so as to provide to the filter coefficients which change in response to changes in the input speech waveform. Coefficient values thus determined are averaged over fixed intervals and successions of such averaged coefficient sets produce representations of words or phrases which can then be used for speech recognition.
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Flanagan, "Speech Analysis, Synthesis, Perception," Springer, Verlag, 1972, pp. 367-370, 390-393.
Ahrens Paul R.
Montlick Terry
Skoge Klaus
Vetter David C.
Kemeny E. S. Matt
Milton Bradley Company
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