| 摘要 |
In a modulation/demodulation system for an infrared data communication, a three-bit serial-to-parallel converting circuit captures an input signal in units of three bits in synchronism with an input clock, and outputs a three-bit parallel data to a decoder. This decoder converts the three-bit parallel data into a four-bit parallel data having different patterns corresponding to all different patterns of the three-bit parallel data in a one-to-one relation. In this four-bit parallel data, regardless of how the four-bit parallel data are serially arranged, the total length of the continuing "1" bits is two bits at maximum, and the total length of the continuing "0" bits is six bits at maximum. A four-bit parallel-to-serial converting circuit receives the four-bit parallel data, to serially output a serial data in synchronism with a modulation clock. Thus, the data transfer rate can be elevated in the infrared data communication.
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