Patent ID: 9722544
Date: 2017-08-01
CPC Classifications: H03F,H04R

Claim:
1. An audio device, comprising: an envelope detector configured to receive an input signal that includes audio signal data distributed over a first time period, and produce a power instruction signal based on at least one characteristic of the input signal detected within the time period; a power supply providing a battery voltage; a switch mode power supply configured to generate a variable rail voltage, wherein the generated variable rail voltage is based on the battery voltage and the power instruction signal received from the envelope detector during the first time period; and a switching signal amplifier configured to receive the generated variable rail voltage and the input signal, and produce an output signal that is based on the received input signal and a gain of the switching signal amplifier, wherein the output signal comprises a plurality of peak output voltages formed at different times within a second time period, and wherein a difference between the generated variable rail voltage and a magnitude of the peak output voltage of the plurality of peak output voltages is equal to or within a fixed buffer level at each of the different times.