Systems and methods for high pass filtering with smart saturation

摘要

An audio processing system that includes an audio filter having one or more elements capable of having state, such as a capacitor, an inductor or a delay. A saturation detector is configured to detect saturation of the audio filter and to generate an output when saturation of the filter is detected, such as a switch control signal. A switch is connected to the audio filter and the saturation detector, wherein the state of one or more of the elements of the audio filter is changed when the saturation detector provides the output to the switch, such as when the switch shorts the element and causes the energy stored in the element to be dissipated.

主权项

1. An audio processing system comprising:
an audio filter having one or more elements capable of having state; a saturation detector configured to detect saturation of the audio filter and to generate an output when saturation of the filter is detected, further comprising: a first comparator receiving a positive saturation level signal and an input signal and generating the output when the input signal exceeds the positive saturation level signal; and a second comparator receiving a negative saturation level signal and the input signal and generating the output when the input signal is lower than the negative saturation level signal; and a switch coupled to the audio filter and the saturation detector, wherein the state of one or more of the elements of the audio filter is changed when the saturation detector provides the output to the switch.