| 摘要 |
PURPOSE:To prevent an error in interpolation by adding 1 to an interpolation value at specified intervals and at a frequency which corresponds to the size of data to be monitored by a correcting circuit. CONSTITUTION:Two successive data FD are inputted and the preceding data is subtracted from the trailing data at a part SUB to obtain their difference data, which is divided at a part SE by the number of sampling periods during one frame period. Then, the division result is added successively at a part AD1 to the precedent data at every sampling period to obtain an interpolation value successively. Then, data consisting of the low-order bit group of the difference data cut-off in the division is monitored by a correcting circuit CP, and ''1'' is added to the successively obtained interpolation value by the correcting circuit CP at specified intervals and at a frequency which corresponds to the size of said monitored data, thereby correcting an error in interpolation. |
