| 摘要 |
PURPOSE:To reduce the memory capacity without reducing amount of information by utilizing a center bit of a high-order odd number bit for read of a memory forming a part of a digital LPF as a positive/negative code of output information of the LPF. CONSTITUTION:The high-order address 12 of a memory 11 constituting a part of the digital LPF storing a binary serial digital signal in odd number of bits is constituted by an odd number of bits 12a-12e, and an input register 13 shifting sequentially the digital signal is connected. The register 13 is constituted into 5-bit 13a-13e and connected to a central bit lead wire 14. An output 16 of the digital LPF is constituted by a bit 14' from the lead wire 14 and output bits 15a-15c of the memory 11, the bit 14' is formed into a bit representing the increase/decrease of phase and the bits 15a-15c are formed into the bit representing the absolute value of the phase. The counter 17 is connected to a low-order address 18 of the memory 11 and the information recorded in the memory 11 is selected and read out. |
