| 摘要 |
<p>A method for processing signals including an input, an output and a signal processor, comprising detecting (205,305) a first periodic signal received at an input, adjusting (212,317) frequency or phase of the first periodic signal in response to detecting the first periodic signal, comparing (214,319) an amplitude of the first periodic signal before adjusting the frequency or phase (211,316) to the amplitude after adjusting the frequency or phase (213,318) to produce a first amplitude change (AC) and determining whether the first periodic signal is an acoustic feedback signal based on the first amplitude change (220,320). Apparatus (870) including signal processing electronics (873) to receive an input signal (855) from a microphone (872) and programmed to provide phase or frequency changes to signals in a processing channel and to detect periodic feedback signals based on the changes of signals in the processing channel, and a speaker (874). Variations include feedback reduction or cancellation systems and phase or frequency adjustment systems.
</p> |
