| 摘要 |
PURPOSE:To transmit an optional voice message without using any special coding device. CONSTITUTION:An A/D converter 13 is provided to convert the voice signals received from a telephone network 11 into the digital voice signals. Then a radio selection call base station device 10 is added to transmit the digital voice signals in addition to a call signal together with a D/A converter 23 which converts the message information into the analog signals with reception of the call signal, and a radio selection call receiver 20 which reproduces the voices through a speaker 24. |
