| 摘要 |
PURPOSE:To improve the profitability of a loop back circuit by cascading one- bit registers by the share of one frame length through separating means and thus constituting a shift register, controlling a specified separating means and dividing the shift register into two front and rear part, and interposing the partial shift registers in loop back paths for digital signals in respective directions. CONSTITUTION:A specific separating means 800 is controlled to divide the shift register consisting of registers 700 into two shift register parts. One partial shift register is interposed in a loop back path for a digital signal in one direction and the other partial shift register is put in a loop back path for a digital signal in the other direction. Consequently, this couple of shift registers delay the signals in both directions properly and the profitability of the loop back circuit is improved.
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