| 摘要 |
PURPOSE:To solve a problem of unable detection of synchronization when an error is in existence in a pattern detected from a PN pattern and to obtain the synchronization detection circuit by which the synchronization is detected even from a test pattern masked at a period independently of a period of the PN pattern. CONSTITUTION:The circuit is provided with a 1st detection pattern input terminal 7-1, a 2nd detection pattern input terminal 7-2, a 1st coincidence detection circuit 3-1 detecting it that a 1st detection pattern is generated in data at a reception data input terminal 6 and data outputted from a pseudo random pattern generating circuit 4 simultaneously and a 2nd coincidence detection circuit 3-2 detecting it that a 2nd detection pattern is generated in data at the reception data input terminal 6 and data outputted from the pseudo random pattern generating circuit 4 simultaneously. A synchronization detection signal is outputted to a dielectric detection output terminal 8 when a coincidence detection signal is outputted to either of the 1st detection circuit 3-1 and the 2nd detection circuit 3-2. |
