Inventors:
Simon Shan Lin Sun - La Puente CA, US
International Classification:
H04B 1/00
Abstract:
An external car amplifier includes an audio amplifier module; a pulse width modulation (PWM) module electrically connected to the audio amplifier module to receive signals generated by a phase inverting unit and a source amplifying unit of the audio amplifier module and compare the same with a signal in the PWM module to generate a PWM signal; a drive amplifier module coupled to the PWM module and controlled by the PWM signal to on/off and generating a high-current audio signal; an on/off control and mute module for receiving a control signal to control the drive amplifier module; and a filter and power supply module electrically connected to the audio amplifier module, the PWM module, the drive amplifier module, and the on/off control and mute module. With these arrangements, the external car amplifier can have reduced production cost and power consumption and output a high-current and high-power signal at high efficiency.