| 摘要 |
PURPOSE:To obtain an excellent spectrum diffusing demodulator in which the demodulation loss of an SS modulating signal hardly occurs. CONSTITUTION:An SS demodulator is constituted by introducing a reverse diffusing method to compensate the influence of an LPF 11 for removing an unnecessary component equipped at the front step of a reverse diffusing signal processing step. That is, by operating and being equipped with a filter 13 for correction in which the LPF 11 and the communication function are approximately equal, an absolute value circuit 14 to obtain the absolute value of the diffusing code signal to pass through the filter, a dividing circuit 15 to divide the output of the above-mentioned LPF with the absolute value output, a comparator 18 to delay the above-mentioned diffusing code only for the prescribed time based on the output of the filter for correction, and a multiplier 3 to multiply the comparator output and the dividing output, a demodulation information signal is obtained. Then, the LPF for reverse diffusing output is approximately unnecessary, and for the demodulation of an SS modulating signal, the wide application can be performed even for the development to public welfare equipment such as the application, for example, to a wireless telephone set for car mounting and a cordless telephone. |
