PURPOSE: To directly convert a parallel digital input signal to an analog acoustic signal, by providing specific number of driving force generating parts sgainst an input of a parallel digital signal input of specific bits, and also operating the generating parts of the number corresponding to weight of each bit.
CONSTITUTION: Driving force generating parts 2a∼2g for driving a plane diaphragm 1 by generating each equal driving force are provided on the diaphragm 1, the generating part 2a provided in the center part is selectively operated by a state of an input line 3a corresponding to the lowest bit in the input lines 3a∼ 3c to which a binary parallel digital signal is applied, the generating parts 2b, 2c provided on the upper and lower parts so as to place the generating part 2a between them are selectively operated by a state of an input line 3b corresponding to the second rank bit, and also the generating parts 2d∼2g provided 2 pieces each on the right and left so as to place the generating part 2a between them are selectively operated by a state of an input line 3c corresponding to the uppermost bit.
NOGUCHI HIROYUKI
KINOSHITA SHIGERU
NAKAMURA YASUYUKI
| JPS5723387A | 1982-02-06 |