PUBLIC ADDRESS AMPLIFIER WHICH IS LIGHTWEIGHT DUE TO THE SUPPLY OF CLASS-D SAMPLING FREQUENCY TO OPT

摘要

Disclosed is a lightweight digital amplifier. The digital amplifier comprises: a signal input unit for receiving an analog signal to be amplified; a signal modulation unit for modulating the analog signal inputted to the signal input unit into a digital signal, and amplifying the modulated signal; a signal-amplifying unit for amplifying a low-power digital signal outputted from the signal modulation unit to different levels to thereby generate a plurality of high-power digital signals; a plurality of filter units for restoring the high-power digital signals amplified by the signal-amplifying unit to a plurality of amplified analog signals; an output selection unit for selecting one of the plurality of filter units, and outputting an amplified analog signal of the selected filter unit; and a speaker terminal for transferring the amplified analog signal outputted from the output selection unit to an external speaker. Since the digital amplifier amplifies a high-frequency signal, the volume and weight of the digital amplifier can be reduced.