Abstract: A decoding circuit including an adaptive synchronizing circuit for synchronizing to time-encoded data streams with an explicit output for eliminating non-data flux reversals in certain types of phase-encoded data such as Manchester-coded data. A preferred embodiment of the circuit includes a timer having first and second inputs and an output for producing a first state in response to a first signal at the first input, and also includes a means for producing a second state at the output of the timer in response to a predetermined condition at the second input. The circuit also includes additional circuit paths operatively coupling the output of the timer with the second input thereto whereby each of the first and second states are maintained at a relatively stable percentage of the time between successive first signals to the first input when the frequency of successive first signals varies. One of the first and second states of the timer provides a blanking pulse for eliminating the non-data flux reversals.