Boots – shoes – and leggings
Patent
1976-05-28
1978-02-21
Gruber, Felix D.
Boots, shoes, and leggings
324 83D, 340347AD, 340347SY, H03K 1302, G01R 2500
Patent
active
040756980
ABSTRACT:
This invention relates to analog-to-digital conversion systems, and makes use of the properties of cyclic variables such as phase angles. In one form of the invention, an analog signal to be converted into a digital value is applied to an input of a phase modulator. The phase modulator shifts the phase of an oscillator signal in accordance with the value of the analog input signal. A series of alternate frequency doubling and heterodyne frequency conversion steps are used to generate a series of signals with the same frequency as the oscillator output signal, but with phase shifts of 2, 4, 8, etc., times the phase shift of the phase modulator output signal. Binary (two-state) signals are generated whose values correspond to the relative phases of the phase modulator output and multiplied phase shift signals. The values of these binary signals are sampled when an analog-to-digital conversion is to be performed. Simple logical operations upon the sampled binary signal values resolve any ambiguities and provide a digital value, corresponding to the value of the analog input signal, in a normal binary or other desired form.
The general concept may be implemented with other than conventional electronic techniques. For example, it may be implemented with microwave, optical and/or other techniques.
REFERENCES:
patent: 3624641 (1971-11-01), Brennan
patent: 3737894 (1973-06-01), Poretti et al.
patent: 3745559 (1973-07-01), Mattern
patent: 3760270 (1973-09-01), Irvin
patent: 3761916 (1973-09-01), Schenk
patent: 3766545 (1973-10-01), Hikosaka
patent: 3889189 (1975-06-01), Lode
patent: 3919706 (1975-11-01), Grimm et al.
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