A method for reading or decoding the self clocking encoded data content of digital data bits encoded in the standard F2F or in phase shift format is described. The method is useful for decoding F2F or phase shift code signals presented in the form of optic, magnetic, or electric signal variations presented...http://www.google.com.hk/patents/US4027267?utm_source=gb-gplus-share專利 US4027267 - Method of decoding data content of F2F and phase shift encoded data streams
