Patent ID: 7519097

Claim:
A spread-signal multiplexing circuit comprising: an amplitude monitoring section for multiplexing a plurality of spread signals and for determining amplitude of a resulting signal in time-series order; a delaying section for delaying the plurality of spread signals in parallel by a time that corresponds to a propagation delay time of said amplitude monitoring section and thereby generating delayed spread signals; a multiplexing section for generating a multiplexed signal by weighting the delayed spread signals with respective weights that are given as a monotonic non-increasing function of the number of spread signals to be multiplexed and by multiplexing the delayed spread signals to properly keep a dynamic range and a signal to noise ratio in conformity with respect to a multiplicity of said spread signals, the respective weights being smaller as an average value of the amplitude determined by said amplitude monitoring section becomes larger; and a selecting section for selecting all or part of the delayed spread signals whose amplitude exceeds a prescribed threshold value, from the delayed spread signals generated by said delaying section, wherein said multiplexing section weights only the delayed spread signal(s) selected by said selecting section.