| 摘要 |
PURPOSE:To reduce the circuit scale of the frame synchronization circuit used for a receiver of QAM or QPSK orthogonal modulation system or the like. CONSTITUTION:An in-phase component I and an orthogonal component Q in an output of a carrier period detection are outputted switchingly from registers 1, 2 to a correlation device 3, in which the correlation is obtained and comparators 4, 5 output a significant level when an in-phase threshold level C0 (C0>0) and an opposite phase discrimination threshold level C1 (C1<0) are exceeded respectively and the result is given to a frame synchronization control circuit 6, from which synchronization phase information decided by the combination of the frame synchronization pulse and the significant level of I, Q is outputted. |
