| 摘要 |
PURPOSE:To prevent erroneous detection from being performed by providing a first means which inputs a reception signal as an analog value or a quantization value and calculates reliability, and a second means which compares calculated reliability with a threshold value set in advance and detects a framing code. CONSTITUTION:The reception signal 200 is quantized to several bits with an A/D converter 212, and a digital input signal 201 is inputted to a shift register 202, and the reliability is calculated at a reliability calculation ROM 203 based on signals from the shift register 202 and a framing code pattern memory 204. A reliability R signal 205 is compared with a threshold value T signal 207 with a comparator 206, and a deciding signal 208 is activated under the condition of R>T, and a framing detection circuit 209 with forward and backward protection functions is operated, thereby, the reception of the framing code with high accuracy can be performed. |
