Boots – shoes – and leggings
Patent
1985-09-05
1987-12-01
Heyman, John S.
Boots, shoes, and leggings
307529, 328 14, 328160, H03B 1900
Patent
active
047108908
ABSTRACT:
A balanced mixer for mixing a discrete approximation of a periodic, continuous signal with a periodic digital signal includes a Johnson counter providing a set of discrete signals suitable for generating a discrete approximation of the continuous signal by appropriately weighting and summing such discrete signals, a resistive weighting and summing network comprising a plurality of weighting resistors corresponding to the discrete signals and having one terminal connected to a summing node, and a plurality of EXCLUSIVE OR gates, each having one input connected to receive a respective one of the discrete signals, another input connected to receive the digital signal to be mixed and an output connected to the other terminal of the weighting resistor corresponding to the discrete signal received by the EXCLUSIVE OR gate. The circuit may be extended to mix two or more discrete approximations of periodic, continuous signals by providing a Johnson counter for each discretely approximated signal to be mixed and a multiplicity of single or plural level EXCLUSIVE OR gates, each having its inputs connected to receive a different combination of one discrete signal from each Johnson counter and its output connected to one terminal of a respective weighting resistor. The other terminal of the weighting resistors are connected to a summing node. The value of the weighting resistor connected to each EXCLUSIVE OR gate is determined by taking the product of the resistor values that would be used to appropriately weight the discrete signals received by the EXCLUSIVE OR gate to generate the signals to be mixed.
REFERENCES:
patent: 3992680 (1976-11-01), Herzl
patent: 4056692 (1977-11-01), Place
patent: 4061909 (1977-12-01), Bryant
patent: 4109208 (1978-08-01), Tomisawa et al.
patent: 4349887 (1982-09-01), Crowley
patent: 4446436 (1984-05-01), Ireland
patent: 4524326 (1985-06-01), Larson
Hekimian Laboratories, Inc.
Heyman John S.
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