| 摘要 |
<p>A method synchronous parallel transmission of digital signals over a telephone line is disclosed. The method includes the steps of generating a synchronization signal having at least two frequencies (6 and 7), simultaneously generating data signals having at least two separate frequencies from the digital signals, converting the synchronization signal and the data signals into audio signals having frequencies corresponding to frequencies of the synchronization signal and the data signals to be transmitted over the telephone line and transmitting at least three frequencies of the audio signals simultaneously over the telephone line.</p> |
