| 摘要 |
A communication system comprises a master station 21 and a plurality of slave stations 22-1 to 22-N each of which communicates with the master station through a radio channel carrying a communication signal by using time division multiple access. The slave stations are similar in structure to one another. The master station is similar in structure to each of slave stations. Each of the slave stations selectively transmits a speech signal and an image signal to the master station. On transmitting the speech signal, the speech signal is converted into an ADPCM signal. On transmitting the image signal, the image signal is converted into a PCM signal. The master station receives the communication signal which is transmitted from each of the slave stations. The master station detects whether or not the communication signal is representative of the ADPCM signal to selectively produce the speech signal and the image signal. |
