Dynamic bass boost filter

A dynamic integer bass boost filter, the filter comprising:

• a high-pass filter, wherein the high-pass filter is configured to receive an input audio signal and produce an output of the high-pass filter;
• and
• a dynamic boost module, wherein the dynamic boost module is configured to:
• determine a current level by subtracting the output of the high-pass filter from the input audio signal to produce a current measure of bass level and averaging the current measure of bass level with one or more prior current levels;
• determine a target gain amount based at least in part upon a target level and the current level;
• based at least in part on the target gain amount, dynamically adjust the output of the high-pass filter by a first gain;
• and
• based at least in part on the target gain amount, dynamically adjust the input audio signal by a second gain;
• wherein an output audio signal is produced by combining the gain-adjusted input audio signal and the gain-adjusted output of the high-pass filter.

A method for dynamically boosting bass frequencies of audio, the method comprising:

• receiving an input audio signal;
• applying a high-pass filter to the input audio signal to produce an output of the high-pass filter;
• determining a current bass level of the input audio signal by subtracting the output of the high-pass filter from the input audio signal, wherein the current bass level is an aggregate bass level generated from a plurality of input samples;
• determining a target bass gain amount based at least in part upon a target bass level and the current bass level;
• determining a current bass gain amount based at least in part upon the target bass gain amount and a previous current bass gain amount;
• based at least in part on the current bass gain amount, dynamically adjusting the output of the high-pass filter by a first gain;
• based at least in part on the current bass gain amount, dynamically adjusting the input audio signal by a second gain;
• and
• producing an output audio signal by adding the gain-adjusted input audio signal and the gain-adjusted output of the high-pass filter.