| 摘要 |
PURPOSE:To comparatively freely set the offset frequency by controlling an offset frequency pattern selection bit, and reading out continuously offset frequency information. CONSTITUTION:An offset frequency pattern selecting circuit 15 sets a sampling bit for sampling data of one symbol, a data accumulation bit for calculating an inter-code interference from the previous and the next bits, and an offset frequency pattern selection bit in order front the lower bit as input address bits of ROM filters 171-174. In such a state, at the time of writing data in the ROM filters 171-174, a frequency pattern corresponding to the offset frequency pattern selection bit from the upper bit is written in with respect to the respective patterns of data whose band is limited. On the other hand, at the time of reading out the data, the control is executed so that offset frequency information is continued by the offset frequency pattern selecting circuit 15 constituted of a ring counter. |
