| 摘要 |
PURPOSE:To realize the transmission and reception of both the voice and the data, by dividing the signals of a talking circuit with a certain delay time to insert the data signal into the gap of the division and then removing the gap by a receiver with the delay time. CONSTITUTION:The sond signal of a voice line is delayed by a time (ams) through a delaying circuit 4 and supplied to a mixer 3 after the bands of 0.3- 2.4kHz are delivered by a low pass filter 1. In this case, the data signal receives a band limitation of 2.4-3.4kHz through a high pass filter 2. This data signal is detected by a data signal detector to set the delay time of the circuit 4 at (a+t)ms. At the same time, the data signal is supplied to the circuit 3 to be mixed with the sound signal. The delay time is increased by (tms) every time when the data signal emerges within the time of a call; the data is inserted into the gap formed by the division of the sound signals; and a detector 6 detects the interruption of the line output singnal, i.e. the interruption of conversation. Thus the delay time is set at the original (ams). The receiver reproduces the original sound and data signals by means of the high and low pass filters, a delaying circuit, etc. |
