| 摘要 |
PURPOSE:To enable to transmit the signal in which dial speed and make rate of dial signal are constant and absent in distortion, in the radio telephone dial signal transmission system using unstable radio lines many in variation conditions. CONSTITUTION:The transmission system is realized by the terminal unit 1 transmitting the dial signal through the conversion of tone signal interruption, and the base station radio unit 2 which receives this signal and transmits correct dial signal to the subscriber terminal. Further, the base station 2 interrupts the tone signal received at the radio receiver 3 to form the dial pulse with the selection at the band pass filter 4 and detection 5 and wave-shape 6. This pulse is inputted to FIFO (consisting of D type FF 71-76, AND circuits 77-85, OR circuits 86-89, and inversion circuits 90-93). After a given time delay 8, it is read out from FIFO 7 with periodical reference pulse 10 to obtain a constant speed of the dial pulse. This drives the constant time generation circuit 11 to form the time corresponding to make or brake, and the dial signal having no distortion is delivered to exchangers. |
