| 摘要 |
PURPOSE:To eliminate the need for the provision of a frame pattern synchronizing circuit for each different frame pattern for synchronization detection by executing the detection of synchronization to an optional frame pattern. CONSTITUTION:A frame pattern latch means 1 latches an input signal pattern with a clear signal, and a frame detection means 2 counts a prescribed number of patterns when the pattern is cleared by the clear signal and detects a frame. A frame pattern comparison means 3 outputs a frame synchronizing signal when the input signal pattern in the detected frame is coincident with the pattern latched by the frame pattern latch means 1 and outputs the clear signal when dissident. Thus, it is possible to detect synchronization of all frame patterns. Thus, it is not required to provide a frame pattern synchronizing circuit for each different frame pattern for the detection of synchronization. |
