| 摘要 |
PROBLEM TO BE SOLVED: To realize transmission of high quality by expressing general transmission state such as not only strong or weak electric field strength, but also the presence or absence of a reflected wave, BER value or the like in an audible low frequency, and facilitating the state from ears in a receiving direction regulation. SOLUTION: A transmission system using a digital modulation technique comprises a low-frequency generating means for generating at least one state signal of a reflecting wave state signal for expressing a mixed state of a reflected wave from the reception signal, an electric field strength state signal for expressing an electric field strength, and a BER state signal for expressing a decoded BER state at a reception side and varying prescribed characteristics of a sound generated in response to the generated state signal. Thus, the system generally analyzes and grasps the transmission state from the state of the generated sound.
|
