In a method and an apparatus for enhancing the probability of substantially error-free reception of a signal including a sequence of discrete bits with the aid of a time-variable threshold value, and wherein each bit has a predetermined duration, and the threshold value may change during the bit duration,...http://www.google.ca/patents/US4456992?utm_source=gb-gplus-sharePatent US4456992 - Method and apparatus for enhancing the probability of error-free reception of digital signals
