Patent ID: 8090118

Claim:
An amplified system incorporating a suppressor against ringing feedback, said system incorporating a ringing and a weak-ringing detector, said system 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 at an amplified level; and a ringing detector receiving a signal from said microphone, said ringing detector functional to compare the volume of sound at frequencies of potential feedback measured at two contemporaneous times, the comparisons producing a difference measurement of the change in volume of sound about a frequency, said ringing detector producing a positive indication of ringing in association with a frequency where the difference measurements about that frequency remain within a ringing range for a first preselected period of time; wherein said ringing detector further produces a secondary positive indication of weak ringing in association with a frequency where the difference measurements about that frequency remain within a weak-ringing range for a second preselected period of time.