% 將已調信號調制到10倍的載波頻率function [ signal_out, xt ] = modulate_high( signal_in, fc, fs )signal_temp = zeros(1,length(signal_in)*fc*fs);signal_length = 1:length(signal_temp);signal_temp(signal_length) = signal_in(floor((signal_length-1)/(fc*fs))+1);xt = signal_length/fc/fs/8;signal_out = signal_temp.*cos(2*pi*fc*xt);