Unitary artificial larynx

Claim 1

AN ARTIFICAL LARYNX COMPRISING, IN COMBINATION, A PULSE CIRCUIT FOR PRODUCING A TRAIN OF PULSES IN THE FREQUENCY RANGE OF APPROXIMATELY 100 TO 200 PULSES PER SECOND, WITH A PULSE DUTY FACTOR OF APPROXIMATELY FIVE PERCENT, AN ELECTROACOUSTIC TRANSDUCER RESPONSIVE TO SAID PULSES FOR INTRODUCING A TONE INTO THE PHARYNX OF THE USER, THE MECHANICAL IMPEDANCE OF SAID TRANSDUCER BEING SUBSTANTIALLY EQUAL TO THE AVERAGE MECHANICAL IMPEDANCE OF THE HUMAN THROAT IN THE REGION OF THE PHARYNX, MEANS FOR SUPPLYING POWER TO SAID PULSE CIRCUIT, A UNITARY CASING MEMBER FOR HOUSING SAID LARYNX, SAID TRANSDUCER BEING SLIDABLY MOUNTED IN AND PROTUDING SLIGHTLY FROM SAID CASING, SPRING MEANS OPPOSING AXIAL MOVEMENT OF SAID TRANSDUCER IN SAID CASING, AND MEANS RESPONSIVE TO AXIAL MOVEMENT OF SAID TRANSDUCER IN SAID CASING FOR VARYING THE FREQUENCY OF SAID PULSE TRAIN, WHEREBY THE PITCH OF THE FREQUECNY OF SAID PULSE TRAIN, WHEREBY THE PITCH OF SAID TONE MAY BE VARIED BY VARYING THE PRESSURE WITH WHICH THE DEVICE IS HELD AGAINST THE THROAT OF THE USER.