LINE SPEED DETECTION SYSTEM

摘要

PURPOSE:To discriminate a normal character data speed in succession to a speed detection character by allowing a line speed detection means to calculate the line speed when a detection means detects a prescribed number of rising or falling. CONSTITUTION:A rising or falling detection circuit 10 detects the rising or falling of a speed detection character sent from a reception signal line. A clock circuit 40 gives a clock signal of a prescribed period to the circuit 10 in this case to calculate the rising or falling time. The rising or falling and time information is stored in a rising or falling storage circuit 50 and used to reproduce the speed detection character as a normal character. When a speed calculation circuit 20 based on a prescribed logic designated by the line offer company detects a prescribed number such as 2 of rising or falling, the circuit 20 calculates immediately the line speed by using the time information from the circuit 40.