PURPOSE: To enable timing pickup easily, even from a high speed di-pulse code series with a simple circuit, by matching the phase of frequency components with different phase through the logical operation of a di-pulse code series.

CONSTITUTION: When a signal (a) of a di-pulse code is applied to an input terminal IN, the signal (a) is inverted at an inverter 2, and a signal (b) delayed by 1/2 period of the signal (a) at a delay circuit 4 is inputted to an exclusive NOR gate 6, where the signals (a) and (b) are operated and a signal (c) is outputted to an exclusive OR gate 10 and an AND gate 12. At the gate 10, a signal (d) delaying 8 on output signal (f) by T/2 and the signal (c) are operated to form the signal (e), and the logical product signal (f) between the signals (e) and (c) is outputted at the gate 12. At a period t1 where the signal (c) changed to high or low level very T/2 time, the signal (c) is outputted as the signal (f) as it is, and at a period t2 where the signal (c) is kept to a high level, the signal (c) is outputted with the change of high/low level each T/2 period according to the signal (e).