The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1980
Filed:
Nov. 14, 1978
Applicant:
Inventor:
Claude H Picou, Saint Cloud, FR;
Assignee:
Le Materiel Telephonique, Boulogne-Billancourt, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 364726 ;
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.