Data transmission method by automatic frequency control

摘要

The specification discloses a data transmission method by automatic frequency control, which automatically selects an optimal data transmission rate between a data-sending end (such as a personal computer) and a mobile phone. An automatic frequency control mechanism (program) is provided at the data-sending end that can automatically change the data transmission rate. Through the communications and protocol between the data-sending end and the mobile phone, the automatic frequency control mechanism starts to look for the highest transmission rate that both of them can reliably transmit data through a cable before transmitting data. Afterwards, real data transmission operations start so as to achieve the goal of transmitting data in the fastest speed and the shortest time.