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 includes a signal input unit which receives an analog signal to be amplified; a signal modulation unit which modulates the analog signal received in the signal input unit into a digital signal and amplifies the modulated signal; a signal amplification unit which amplifies the digital signal of low power output from the signal modulation unit into a plurality of high power digital signals having different amplitudes; a plurality of filters which restore the respective high power digital signals amplified by the signal amplification unit into a plurality of amplified analog signals; an output selection unit which selects one filter among the plurality of filters and outputs the amplified analog signal of the selected filter; and a speaker terminal through which the amplified analog signal is transmitted from the output selection unit to an external speaker, thereby achieving reduction in volume and weight.