| 摘要 |
PURPOSE:To simplify the circuit constitution and to reduce the circuit scale, by taking the sampling only once for a half bit period of the first half and comparing the levels of the half bit period of the first half of a modulation signal for the purpose of demodulation. CONSTITUTION:The level of the half bit period at the first half of a modulation signal (c) is the same, even if either data signal of ''0'' or ''1'' is consecutive in the ''1'' of a data signal in taking notice to a level of the half bit period of the first half in the M system of modulation system, and even if any of the data signal of ''0'' and ''1'' is consecutive to the ''0'' of the data signal, the level of the half bit period of the first half is inverted. Thus, the level of the half bit period of the first half of a modulating signal (a) is taken sequentially as T1, T2, T3- T8 for the comparison of the levels placed close together. Then, when the level of the both is equal, ''1'' is obtained and when different, ''0'' is set for the purpose of demodulation. |
