Patent ID: 8103019

Claim:
An amplified system incorporating a suppressor against ringing feedback, comprising: a microphone; a speaker; an amplifier connected to said microphone and said speaker in a way such that sound received at said microphone is produced at said speaker under amplified power; a frequency level detector configured to provide a volume level with respect to a plurality of frequency-spectrum divisions; a gain determiner configured to compute the gain between two measured volumes of sound at frequencies of potential feedback measured at two contemporaneous times; and a ringing detector functional to evaluate the computed gain at a plurality of frequency divisions, wherein each gain evaluation produces a positive indication of ringing in association with a frequency division where the corresponding computed gain about that frequency division remains substantially within a ringing range for a first preselected period of time; wherein said ringing detector incorporates a measure of probability of present feedback for each of the plurality of frequency-spectrum divisions.