Method and system for determining filter gain and automatic gain control

摘要

A method and system for determining filter gain and automatic gain control for fixed point low delay algorithms in real time systems are disclosed. An inventive aspect of the present invention involves computing filter gain using an approximation calculation by filtering a signal similar in spectrum to an input to be filtered and then fine-tuning it based at least in part on a short term moving mean square calculation in a low delay, low MIPS state of an algorithm. A method for determining a filter gain comprises the steps of: receiving an input to be filtered wherein the input has a spectrum; filtering a signal substantially similar in spectrum to the input to be filtered; computing the filter gain based on the filtering step; and fine tuning the filter gain.