| 摘要 |
PURPOSE:To monitor a circuit error easily and economically by forming a test pattern by processing an order wire pattern and by collating the test pattern with the order wire pattern received at a reception side. CONSTITUTION:A speech voice from transmitter 4 is digitized by order wire encoder 11 to obtain an order wire pattern. This order wire pattern is inverted by inverter 12 and transmitted as a test pattern. Order wire decoder 13 at reception side R demodulates the received order wire pattern into an analog signal, which is transferred to receiver 14. The order wire pattern is inverted by inverter 12b and led to exclusive OR gate 5. To the other input of exclusive OR gate 5, the received test pattern is inputted, and both the patterns are collated with each other sequentially. The uncoincidence between the both is counted by BER measurer 9. |
