Multifrequency digital signal receiver

Details Multifrequency digital signal receiver Multifrequency digital signal receiver

1978-11-14

1980-09-16

Moffitt, James W.

Boots, shoes, and leggings

364726, H04M 150

Patent

active

042231850

ABSTRACT:
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.

REFERENCES:
patent: 4025730 (1977-05-01), Sawai

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