Speech synthesizer

Claim 1

IN A RESONANCE VOCODER SYNTHESIZER, A SOURCE OF A PLURALITY OF CONTROL SIGNALS INCLUDING A PITCH CONTROL SIGNAL, AN AMPLITUDE CONTROL SIGNAL, AND A GROUP OF FORMANT CONTROL SIGNALS REPRESENTATIVE OF THE FREQUENCIES OF SELECTED LOW FREQUENCY FORMANT PEAKS IN THE SPECTRUM OF AN ORIGINAL SPEECH WAVE, FIRST SYNTHESIZING MEANS RESPONSIVE TO SAID PLURALITY OF CONTROL SIGNALS FOR DEVELOPING AN ARTIFICIAL SPEECH SPECTRUM HAVING A FIRST GROUP OF PEAKS AT FREQUENCIES REPRESENTED BY SAID FORMANT CONTROL SIGNALS, AND SECOND SYNTHESIZING MEANS FOR SHAPING SAID ARTIFICIAL SPECH SPECTRUM TO HAVE A SECOND GROUP OF PEAKS AT SELECTED FIXED FREQUENCIES REPRESENTATIVE OF HIGH FREQUENCY SPEECH FORMANTS, SAID SECOND SYNTHESIZING MEANS INCLUDING A RESONANT CIRCUIT HAVING A TRANSFER CHARACTERISTIC WITH NO ZEROES AND AN INFINITE NUMBER OF POLES AT EQUALLY SPACED PREDETERMINED FREQUENCIES, WHEREIN THE HIGHER FREQUENCY POLES OF SAID TRANSFER CHARACTERISTIC CORRESPOND IN FREQUENCY TO HIGH FREQUENCY SPEECH FORMANTS, AND A PLURALITY OF SERIES-CONNECTED ANTIRESONANT CIRCUITS PRECEDING SAID RESONANT CIRCUIT, EACH OF SAID ANTIRESONANT CIRCUITS HAVING A TRANSFER CHARACTERISTIC WITH NO POLES AND A ZERO AT A PREDETERMINED FREQUENCY CORRESPONDING TO AN UNWANTED POLE IN SAID TRANSFER CHARACTERISTIC OF SAID RESONANT CIRCUIT, AND MEANS FOR APPLYING SAID ARTIFICIAL SPEECH SPECTRUM TO SAID SECOND SYNTHESIZING MEANS.