Control of modulation process based on detected error rate

摘要

A communicating apparatus which received a signal transmitted from external equipment detects a transmitting situation of a transmission path by an error state of the reception signal. The communicating apparatus controls a modulating process of an information signal which is transmitted in accordance with the transmitting situation detected by the error state. Thus, the modulating process of the transmission signal is controlled in accordance with an environment of the transmission path and a process such that a transmission error rate and an information amount are optimum can be realized.