Boots – shoes – and leggings
Patent
1983-06-13
1986-08-05
Gruber, Felix D.
Boots, shoes, and leggings
179 84VF, 364487, G06F 1531, H04Q 145, H04M 150
Patent
active
046047131
ABSTRACT:
The purpose of the receiver is to indicate the reception of a multifrequency signal and to identify said signal. A multifrequency signal is a signal combining two predetermined pure tones, one belonging to a high-frequency range, the other to a low-frequency range. The received signal is sampled at 8 KHz and digitally converted. The signal provided by the converter is simultaneously processed by two tone detectors. Each tone detector comprises: a bandpass filter covering the high- or low-frequency range and supplying the components (x, y) of the filtered signal in Cartesian coordinates; decimation means at the output of said filters; a converter converting the Cartesian coordinates (x, y) into polar coordinates (.rho., .theta.); and logic circuits analyzing the variations of said .rho. and .theta. over fixed periods of time to derive therefrom an identification of the received tone.
REFERENCES:
patent: 4100378 (1978-07-01), Claasen et al.
patent: 4231094 (1980-10-01), Desblache
patent: 4258423 (1981-03-01), Lane et al.
patent: 4297533 (1981-10-01), Gander et al.
patent: 4354248 (1982-10-01), Conger et al.
patent: 4363100 (1982-12-01), Agnew et al.
patent: 4484035 (1984-11-01), Graham et al.
Godard Dominique
Morlec Emile
Frisone John B.
Gruber Felix D.
International Business Machines Corp.
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