| 摘要 |
PURPOSE:To prevent effectively the delay of the control signal due to a filter process and an overlap process and the characteristic deterioration caused by the noise and to realize a high-speed communication, by giving an arithmetic process to the sampled value for each modulating element of two wave detection signals according to a prescribed system. CONSTITUTION:A prescribed operation is carried out for wave detection signals x and y through transversal filters alpha and delta of a block U1 of a demodulating circuit. These signals x and y are then applied to a block U3. The control signal of phase shift receives an operation through arithmetic elements 1-12, an automatic phase control circuit APC and 1/(a<2>+b<2>) of the block U3. Then the modulated vector is decided from a function table VN. At the same time, the transmission data per modulating element is restored by a 1-channel storing circuit T2 and an adder 13 and fed to an interface circuit INT. Furthermore an estimated error is calculated by an error estimated value calculating circuit S of the automatic equalizing wave detection signal of a block U2 and then applied to a circuit ATC which extracts the timing information from the blocks U1 and U2 plus the wave detection signal. Thus a high-speed communication is made possible. |
