| 摘要 |
PURPOSE:To reproduce audio by directly inputting each bit signal of a digitized audio signal to plural piezoelectric vibrating parts which are weighted so as to generate sound pressures corresponding to the weight of each bit of the digital input signal. CONSTITUTION:Piezoelectric vibrating elements 15-18 are stuck on an elastic diaphragm 11, and these piezoelectric vibrating elements 15-18 are weighted by width, etc., so as to generate the sound pressures corresponding to the weight of each bit digit of the digital input signal. Further, each bit signal of a binary code is inputted to these respective piezoelectric vibrating parts 15-18, and the respective piezoelectric vibrating parts 15-18 are driven for every bit digit and generate the sound pressures corresponding to the weight of each bit digit. Thus, the plural piezoelectric vibrating parts are directly driven by the digital input signal, and a PAM wave, namely, the waveform of an original sound, is reproduced. |
