设计支持

 

Audio signals, especially in music, contain non-uniform signals with frequency components typically ranging from 20 Hz to 20 kHz. In portable mid-power audio applications, amplifiers are capable of driving low impedance speakers with power levels above 1 W to 2 W. Therefore, fluctuation levels of the battery current draw can be significant and the battery voltage will not be steady throughout the discharge; this makes predicting the battery life or state of charge (SOC) via the traditional voltage-based ADC method, unreliable.