| 摘要 |
PURPOSE:To easily and surely make a synchronization between a transmitting and a receiving stations possible, in a noisy environment by making a master station transmit a data (unit correspondence), while an advance notice signal with a prescribed constitution, as a signal for synchronization, is added to the head of the data, for the sake of a communication between the master station and a slave station, and making it call the slave station. CONSTITUTION:In a synchronizing method that prescribed number of characters, consisting of start bits 10a, data bits 10b and stop bits, etc., having prescribed length respectively, are put in a string at a prescribed time interval, and made to be a unit correspondence 10, and the starting time of an electro magnetic wave signal, modulated as prescribed, is detected by using the digital signal of the unit correspondence 10, a first advance notice electro magnetic wave signal (advance notice H-signal 301), constituted by holding the modulated electro magnetic wave, corresponding to the logical value of the start bits, for time TH, longer than a character length at least, and a second advance notice electro magnetic wave signal (advance notice L-signal 302), constituted by holding the modulated electro magnetic wave, corresponding to the contrary logical value, for the prescribed time TL, and besides, following to the first advance notice electro magnetic wave signal, are added to the head part of the unit correspondence electro magnetic wave signal, and made to be a calling signal 11. As for the response signal 12 of the slave station, the advance notice signal 30 is prepared at its head part as well. |
