| 摘要 |
Data compression of digital data, which are sent out sequentially from a connected external device(9) and are divided into blocks, is executed on a time base by executing modulation process in unit of predetermined number of blocks, and the digital data in which header information including at least a destination is allocated to a free time space generated by the data compression are transmitted to a predetermined destination. On the contrary, the header information are extracted from the digital data received from the sender and then erased, and the digital data which are subjected to demodulation process to demodulate a frequency into a transmission speed peculiar to the external device(9) by executing data expansion on the time base are received by the external device(9). <IMAGE> |
