Boots – shoes – and leggings
Patent
1986-08-08
1988-06-28
Lall, Parshotam S.
Boots, shoes, and leggings
364481, 307353, 324 83D, H04N 9535, G06F 1520
Patent
active
047544112
ABSTRACT:
A transducer formed of one or more electrode arrays is positioned in confronting relation and parallel to the plane of rotation of one or more rotating members. A plurality of phase modulated, two-phase, square wave drive signals of the same amplitude and frequency are applied to each electrode. The signals are combined at a central node or electrode to form, as a result of the signal, the superposition of the algebraic sum of all drive signal pairs. Samples of the resultant signal taken at the same frequency and of a duration of less than one-half the duration of the drive signal period provide a multi-step, synchronously detected signal. The detected signal is a multi-step approximation to a sine wave, the phase angle thereof relative to a timing point being proportional to the angular position of the rotating member. The amplitudes and phase shifts of the multi-step detected signal are then reduced to a plurality of vectors, from which two orthogonal vectors are produced which may be mathematically reduced to the amplitude and phase angle of the aforesaid sine wave. The phase angle is transformed or converted into a binary representative of the hand position.
REFERENCES:
patent: 3758763 (1973-09-01), Nohara et al.
patent: 4305040 (1981-12-01), Koide
patent: 4322697 (1982-03-01), Carbrey
patent: 4359755 (1982-11-01), Srivastava
patent: 4363976 (1982-12-01), Minor
patent: 4494089 (1985-01-01), Yagi
patent: 4558422 (1985-12-01), DenBeste et al.
Cain Encoder Co.
Garmon Judith E.
Lall Parshotam S.
Rhodes Charles R.
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