| 摘要 |
PURPOSE:To prevent echo by transmitting a transmitted voice as it is from a control part connected to a transmitting/receiving bus when a terminated voice is ''0'', and when the terminated voice is not ''0'', converting a signal from a transmitted voice analyzer into soundless status. CONSTITUTION:In case of transmission, an analog signal from a telephone set 11 is filtered by an LPF13 through a hybrid transformer 12, A/D converted by an A/D converter 14 and the feature of the voice is extracted by the voice analyzer 15, read out by the control part 19 through the bus, transferred to a digital interface part 20, and transmitted to a circuit 21. At the time of reception, the control part 19 discriminates the voice intensity of the signal received through the circuit 21 and the digital interface part 20, and when the signal is a sound, an analyzed result from the voice analyzer 15 is converted at its format and the transmitted data are sent to the digital interface part 20 as the soundless status by changing its sound intensity. |
