Abstract: This invention relates to a method of encoding data by transitions in a binary sequence, as well as to a coder and a decoder using the method. In the method data is encoded as follows: a first value bit is encoded by a transition in the middle of the corresponding bit-time, but this transition is inhibited if there was a transition in the middle of the previous bit-time, a second value bit is encoded by a transition at the beginning of the corresponding bit-time, but this transition is shifted from the beginning to the middle of the bit-time if there was a transition in the middle of the previous bit-time.

Abstract: A device for decoding a Miller-encoded message in the form of binary data at a clock frequency F. The decoder comprises: a transition detector which provides a very short pulse at each transition in the encoded message; first means controlled by a local clock at frequency F to pass only those short pulses which have the same phase; second means for stretching the short pulses passed by the first means to a duration of (1/2F); a local clock phase lock loop acting on a voltage-controlled oscillator of the local clock and responsive to the output signal of the second means; and a flip-flop to sample the output of the second means under the control of the local clock.