| 摘要 |
PURPOSE:To make the component of a circuit large in scale such as an arithmetic circuit unnecessary and to simplify the circuit, by selecting a data generated at a shift register corresponding to a phase difference, and delaying it with a delay means. CONSTITUTION:When a signal representing the delay of more than 45 deg. of the phase of an output signal is supplied to a first counter 14, a switching signal is supplied from the first counter 14 to a data selector so as to output the signal whose phase is led. And phase adjustment within 45 deg. is performed by a first-a fifth delay circuits 21-25 and a first-a fifth change-over switches 31-35. In other words, by performing the phase adjustment at every 45 deg. and fine phase adjustment within a range of 45 deg. by the data selector 15, a pulse signal having the same phase as that of a color burst signal obtained at an input terminal 11 is outputted from an output terminal 19. Also, since a shift circuit is constituted of a comparatively simple components such as a gate circuit, etc., and requires no components such as the arithmetic circuit, etc., it is possible to simplify circuit constitution.
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