Le Materiel Telephonique

Claude H Picou

A multifrequency code receiver for signals consisting of the sampled and encoded sum of q sinusoids of amplitudes A.sub.f, whose frequencies f are regularly spaced apart by .DELTA.F.sub.i =p.DELTA.F.sub.O (.DELTA.F.sub.O being a divisor of the sampling frequency F.sub.E) the receiver possessing a heterodyne device transforming each value f into F.sub.L -f, a multiple of .DELTA.F.sub.O, a counter counting up to r, where r=F.sub.E /F.sub.T, F.sub.T being the divisor of F.sub.E greater than (q-1).DELTA.F.sub.i, filtering circuit, a fast Fourier transform (FFT) computer for N.sub.T =F.sub.T /.DELTA.F.sub.O samples producing the amplitudes A.sub.f.

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Saint Cloud, France

Claude H Picou