Offset Calibration Circuit for Battery-Driven Audio Pop Noise

The patent applies the dynamics principle by transforming the fixed compensation value into a dynamically adjustable one. The calibration circuit now includes a supply voltage detection circuit that continuously monitors the supply voltage level and automatically adjusts the compensation value accordingly. This dynamic adjustment mechanism ensures that the compensation value always matches the current supply voltage condition, thereby maintaining high DC offset calibration accuracy across varying battery power levels without significantly increasing circuit complexity.

The patent implements parameter changes by making the compensation value variable based on supply voltage levels. Instead of using a single fixed compensation value, the system now has multiple compensation values corresponding to different supply voltage ranges. The supply voltage detection circuit determines which compensation value to apply based on the detected voltage level, effectively changing the compensation parameter to match operating conditions and resolve the contradiction between circuit simplicity and calibration accuracy.

The patent applies feedback by introducing a supply voltage detection circuit that continuously monitors the supply voltage level and feeds this information back to the calibration circuit. This feedback mechanism enables the system to automatically detect when the supply voltage changes due to battery depletion and adjust the compensation value accordingly. As a result, the audio output quality remains reliable throughout the entire battery operation duration, eliminating pop noise that would otherwise occur during battery power changes.

The patent implements preliminary action by proactively adjusting the compensation value before pop noise occurs. The supply voltage detection circuit anticipates supply voltage changes and pre-adjusts the compensation value to match the upcoming operating conditions. This preliminary adjustment prevents the occurrence of pop noise rather than merely responding to it after it happens, thereby maintaining audio quality throughout battery discharge cycles.