| 摘要 |
PURPOSE:To provide a noise reduction circuit which can reduce error caused by single noise generated on a data line at the time of asynchronous data transmission. CONSTITUTION:This circuit is provided with an FF 1 to be turned off by the rising of a clock when input data are zero, to be, turned on by the rising of the clock when the single noise is generated during this OFF and to be turned off by the rising of the next clock, FF 2 to be turned off by the ON of the FF 1 caused by the generation of the single noise and to be turned on by the OFF of the FF 1, FF 3 to be cleared by the outputs of the FF 1 and FF 2 and the output of an exclusive OR, to divide a frequency with the falling of the clock and to generate a sampling clock with that output, and FF 4 to synchronously extract the output of the FF 1 with the sampling clock and to input it to a demodulation circuit. |
