ALL-DIGITAL CLASS-D AUDIO AMPLIFIER WITH DIRECT BATTERY HOOK-UP

摘要

An audio system and method of generating an amplified audio signal comprises a class-D audio amplifier; and a battery directly connected to the class-D audio amplifier, wherein the direct connection between the battery and the class-D audio amplifier achieves a power efficiency greater than approximately 90%. The audio system may further comprise an analog-to-digital converter (ADC) adapted to digitize an output voltage of the battery and digital signal processing to maintain constant audio volume regardless of the battery voltage drift.