| 摘要 |
PURPOSE:To improve considerably code distortion by providing a zero cross point detection circuit, a counter, a decoder, 1st and 2nd pulse generating circuit and a gate circuit to the demodulation circuit. CONSTITUTION:The demodulation circuit consists of a zero cross point detection circuit 2, a counter 3, a decoder 4, 1st pulse generating circuit 5, a 2nd pulse generating circuit 6 and an OR circuit 7. That is, the zero cross point detection circuit 2 consists of a comparator 10 and a differentiating circuit 11, the 1st pulse generating circuit 5 consists of an RS latch circuit 17 and the 2nd pulse generating circuit 6 consists of a counter circuit 19 and an RS latch circuit 18 respectively. In this case, it is possible to demodulate and reproduce a data having a same pulse width (data width) as that of an original binary digital signal. Thus, code distortion due to a reproduced data pulse width error is considerably improved. |
