A multifrequency code receiver for signals consisting of the sampled and encoded sum of q sinusoids of amplitudes Af, whose frequencies f are regularly spaced apart by DELTA Fi=p DELTA FO ( DELTA FO being a divisor of the sampling frequency FE) the receiver possessing a heterodyne device transforming each value f into FL-f, a multiple of DELTA FO, a counter counting up to r, where r=FE/FT, FT being the divisor of FE greater than (q-1) DELTA Fi, filtering circuit, a fast Fourier transform (FFT) computer for NT=FT/ DELTA FO samples producing the amplitudes Af.
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机译：一种用于信号的多频代码接收器，该信号由q个幅度为Af的采样正弦和的已编码和编码总和组成，其频率f定期以DELTA Fi = p DELTA FO（DELTA FO是采样频率FE的除数）隔开外差设备将每个值f转换为FL-f，DELTA FO的倍数，计数到r的计数器，其中r = FE / FT，FT是FE大于（q-1）DELTA Fi的除数，滤波电路，用于NT = FT / DELTA FO样本的快速傅立叶变换（FFT）计算机，产生振幅Af。
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