Boots – shoes – and leggings
Patent
1982-09-30
1985-02-12
Ruggiero, Joseph F.
Boots, shoes, and leggings
328138, 364484, 364727, 364851, G06J 100, G06F 15332
Patent
active
044995504
ABSTRACT:
A mixer stage having particular application to digital detectors. The mixer stage includes first and second sets of transmission gates and a Walsh function generator. The first set of transmission gates is driven by sine function coefficient signals from the Walsh function generator so as to open and close individual gates of the set so as to effectively multiply an input signal by the sine of a tone reference frequency to be tone detected. Similarly, the second set of transmission gates is driven by cosine coefficient signals from the Walsh function generator so as to open and close individual gates of the second set to effectively multiply the input signal by the cosine of the reference frequency to be tone detected. To form a complete digital tone detector, the sine and cosine multiplied outputs of the mixer stage are each filtered and squared and are then summed and further filtered to provide a "detect" signal when the input signal includes the reference frequency.
REFERENCES:
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4047009 (1977-09-01), Challen
patent: 4052565 (1977-10-01), Baxter et al.
patent: 4258423 (1981-03-01), Lane et al.
patent: 4333150 (1982-06-01), Matty et al.
patent: 4334273 (1982-06-01), Ikeda
patent: 4363100 (1982-12-01), Agnew et al.
Martin Robert J.
Ray, III John M.
General Electric Company
Ruggiero Joseph F.
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