Texas Instruments Corporation

Tim Colvin

Daniel A Mavencamp

Ronnie A Bean

Provided is a method ( ) and audio circuit ( ) for reducing popping noise in a load ( ) connected to the audio circuit, especially during audio circuit start-up. The method applies a time varying voltage ( ) to the load that has a smooth, S-shaped curve when plotted over time. The device include an integrated circuit (IC) set as a channel block ( ), a load connected between the channel block and ground, a bypass control ( ) connected to the channel block for producing a controlled ground reference voltage having an S-shaped curve to the channel block, a shunt control ( ) controlling the voltage delivered across the load, and a ground capacitor ( ) coupled between the bypass control and ground. The channel block typically includes an amplifier which supplies the output voltage across the load. The bypass circuit generally includes a bypass generator and a transistor selectively providing a charge to the ground capacitor.

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Ridgeland, MS, United States of America

Tim Colvin