Synthesis of artificial speech

Claim 1

APPARATUS FOR CONSTRUCTING AN ARTIFICAL GLOTTAL WAVEFORM THAT CLOSELY APPROXIMATES THE ORIGINAL GLOTTAL WAVEFORM CHARACTERISTIC OF VOICED PORTIONS OF A HUMAN SPEECH WAVE WHICH COMPRISES A SOURCE OF A FIRST CONTROL SIGNAL REPRESENTATIVE OF THE FUNDAMENTAL PERIOD OF VOICED PORTIONS OF SAID SPEECH WAVE, A SOURCE OF A THIRD CONTROL SIGNAL REPRESENTATIVE OF THE AMPLITUDE OF THE NONZERO PORTION OF EACH PERIOD OF THE GLOTTAL WAVEFORM CHARACTERISTIC OF SAID SPEECH WAVE, A SOURCE OF A THIRD CONTROL SIGNAL REPRESENTATIVE OF THE DURATION OF THE NONZERO PORTION OF EACH PERIOD OF SAID SPEECH WAVE, MEANS SUPPLIED WITH SAID FIRST, SECOND AND THIRD CONTROL SIGNALS FOR INTRODUCING RANDOM FLUCTUATIONS INTO THE VALUES REPRESENTED BY EACH OF SAID CONTROL SIGNALS, MEANS SUPPLIED WITH SAID RANDOMLY FLUCTUATING SECOND AND THIRD CONTROL SIGNALS FOR DERIVING A GROUP OF PARAMETERR SIGNALS SPECIFYING SELECTED PARAMETERS OF THE NONZERO PORTION OF EACH PERIOD OF SAID GLOTTAL WAVEFORM, AND MEANS SUPPLIED WITH SAID RANDOMLY FLUCTUATING FIRST CONTROL SIGNAL AND SAID GROUP OF PARAMETER SIGNALS FOR SYNTHESIZING AN ARTIFICIAL GLOTTAL WAVEFORM WITH PERIODS THAT ALTERNATE BETWEEN RELATIVELY LONG DURATIONS AND RELATIVELY SHORT DURATIONS ACCORDING TO A PREDETERMINED PATTERN.