| 摘要 |
The characteristics of a signal between a transmitter and a receiver are tested by a method comprising sending from one to the other two signals comprising: a first transmission in simplex mode at a frequency between 300 Hz and 3000 Hz in order to test the level of audio sound and frequency distortion of the signal, and a second transmission at a lower level in duplex mode using means to detect audio breaks, distortion and noise. |
