In a tap control circuit for use in an adaptive filter for filtering a received signal into a filtered signal in accordance with first through N-th controllable tap gains which are produced by a producing section dependent upon the filtered signal and a control parameter, where N represents a positive...http://www.google.com.tw/patents/US5218560?utm_source=gb-gplus-share專利 US5218560 - Circuit for controlling tap gains at rapid speed in an adaptive filter
