Boots – shoes – and leggings
Patent
1982-03-25
1984-10-02
Malzahn, David H.
Boots, shoes, and leggings
343 5SC, G06F 500
Patent
active
044751664
ABSTRACT:
The invention enables a logarithmic plot to be generated for values pertaining to uniformly spaced sampling points of a frequency axis, for example, such as the values provided by a discrete Fourier transform processor, while utilizing a conventional display device with a linear time base. To this end the array of input values provided by the processor is converted in a further processor to values corresponding to points uniformly spaced along a logarithmic frequency axis. If points on the logarithmic and linear axis are indexed by values x and y respectively, the y values (in general non integral) corresponding to x-1/2 and x+1/2 are calculated, the corresponding integral values of y are ascertained and the output value corresponding to x is formed as a weighted sum of the input values for these two integral y values and any intervening integral y values. The display is obtained by addressing the output values synchronously with the time base through an address circuit 17 and converting the values in a digital to analog converter 14 before application to the Y input of the display device 15.
REFERENCES:
patent: 4002827 (1977-01-01), Nevin et al.
patent: 4057756 (1977-11-01), Ley et al.
patent: 4099179 (1978-07-01), Hofstein
patent: 4220969 (1980-09-01), Nitadori
Gaudier Dale
Malzahn David H.
The Solartron Electronic Group Limited
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