| 摘要 |
PURPOSE:To improve an error rate, transmission efficiency and a transmission rate by encoding a digital receiving signal in order of sampling, comparing the past value and the latest value of encoded data and detecting whether a self-correlation of a receiving signal exists or not. CONSTITUTION:Registers 5-7 hold successively 8-bit data (Dn-1), (Dn-2), and (Dn-3), respectively in order of arrival from a CPU 3. In such a state, when a CPU 3 outputs the latest data (Dn), the holding contents of each register 5-7 are transferred successively to the next stage, and also, the output data (Dn-3) of the register 7 is compared with the data Dn by a comparing means 9 through an inverting means 8. When a coincidence is obtained by the means 9, a counting value of a counting means 10 is increased by one, and when a coincidence is not obtained, the value is decreased by one. When this counting value is >=3, it is decided that a sampling signal in that case is a preambld signal. In such a way, the preamble signal can be detected surely in an early stage, and a receiver of good transmission efficiency and a high transmission rate is obtained. |
