| 摘要 |
PURPOSE:To eliminate the need for a bit synchronizing circuit such as a PLL and to make decoding timing sure even when transmitted data have no clock component. CONSTITUTION:FSK modulation is executed to an PN signal clock by transmitted data from a data transmission circuit 1. At a PN signal generator 3, a PN signal for diffusing the frequency is generated by the clock. Then, the frequency is converted to a carrier frequency by a frequency conversion circuit 5, amplified by a power amplifier circuit 6 and finally outputted. On the other hand, a PN signal period detecting circuit 4a detects one period of the PN signal from the output of the PN signal generator 3. This PN period signal is frequency divided into 1/N and transmitted to the data transmission circuit 1 as a transmitted data clock. In the data transmission circuit 1, data are transmitted synchronously with the transmitted data clock. Therefore, the transmitted data are synchronized to the PN signal period. |
