Digital devices for spectrum analysis

Details Digital devices for spectrum analysis Digital devices for spectrum analysis

1979-04-23

1981-08-25

Wise, Edward J.

Boots, shoes, and leggings

179 84VF, 324 77B, 364715, G06F 1531

Patent

active

042863260

ABSTRACT:
This invention relates to digital devices for spectral analysis.
Signal x(t) of spectrum X(f), sampled at frequency 1/T and encoded, is processed by a temporal digital filter having a width NT followed by one or more perfect digital resonators in parallel, each tuned to a specific predetermined frequency f.sub.p and possessing two outputs, one being the "sine" output and the other being the "cosine" output on which the digital signals X(f.sub.p) sin 2.pi.f.sub.p kT and X(f.sub.p) cos 2.pi.f.sub.p kT are obtained after time NT, from which the value X.sup.2 (f.sub.p) can be formed by conventional digital processing.
Application to encoded multifrequency signal receivers used in telephone switching.

REFERENCES:
patent: 3466431 (1969-09-01), Fuchs et al.
patent: 3573446 (1971-04-01), Bergland
patent: 3881097 (1975-04-01), Lehmann
patent: 3903401 (1975-09-01), Jayant
patent: 3920978 (1975-11-01), Schmitt et al.
patent: 4080516 (1978-03-01), Kuwahara
patent: 4093989 (1978-06-01), Fink et al.
patent: 4157457 (1979-06-01), Sakoe et al.

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