TIME-BASE COMPRESSING AND EXPANDING DEVICE

PURPOSE:To reduce noises originating from signal charge transfer operation by driving a CCD with two two-phase transfer clock pulse signals and reading a signal out of the CCD, equalizing 1st and 3rd pulse train signals in pulse width substantially to each other, and setting the pulse width to smaller than a half as large as a smaller period between 1st and 2nd periods. CONSTITUTION:When there is transition from a write period to a read period, variation in residual charge amount at the crooked part of the charge transfer channel of the CCD 22 is obtained as variation from a residual charge amount q4 to a residual charge amount q5 by variation from pulse width tau4 to pulse width tau5 as to a clock pulse of the other phase of the two-phase transfer clock pulse signal. Then the pulse width tau3 is made smaller than a half as large as pulse width tau2 to make the pulse width tau4 larger than pulse width tau1. Consequently, the residual charge amount q4 and residual charge amount q5 are made relatively small. Therefore, noise components contained corresponding to variation in residual charge amount at the crooked part of the charge transfer channel of the CCD 22 are reduced effectively.