| 摘要 |
<p>PURPOSE:To eliminate nonlinearity and noise by comparing an electric vibration being the result of photoelectric conversion of mechanical vibration by a shield plate connected to a cone shaped mechanical diaphragm with an inputted digital signal at a digital comparator circuit. CONSTITUTION:A formatted digital signal is inputted from a terminal 1 and the format is converted by a format conversion circuit 4 of a power amplifier 2. Then the signal is given to one input of a digital comparator 5, a driver circuit 6 converts the signal into an analog signal to drive a cone shaped diaphragm 8. Plural shield plates 9 connecting to the diaphragm 8 controls the luminous quantity of the light outputted from a light emitting element 10 to an optical fiber 11 to be given to a photodetector 12, an optical signal is converted into digital electric vibration and the result is given to the other input of the digital comparator 5. The output of the digital comparator 5 is converted into an analog signal by the driver circuit 6 to drive the diaphragm 8. Thus, the vibration due to the nonlinearity or noise in the transmission path is eliminated and an audio signal with high quality is obtained.</p> |
