VOCAL APPARATUS Russian patent published in 1999 - IPC

FIELD: medical engineering. SUBSTANCE: vocal apparatus has power supply unit, series-connected electric pulse generator and power amplifier, outputs of which are connected to leads of moving coil coupled to flange of electrodynamic transducer striker and positioned in its magnetic system. Vocal apparatus also includes flexible diaphragm coupled to striker and secured on top of end face of electrodynamic transducer body with rigid ring by means of clamping screws over outline. Vocal apparatus contains contact membrane made of nonmagnetic material, positioned above striker and secured by means of shock-absorbing gaskets in apparatus cap. Through holes are made in body of electrodynamic transducer. Flange of electrodynamic transducer striker is provided with through holes total area of which makes up at least 0.1 of flange area. Electric circuit of apparatus may be represented by integrated circuit. EFFECT: enhanced efficiency, reduced dimensions. 2 cl, 2 dwg