The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 1984
Filed:
Mar. 25, 1982
Stephen N Cope, Cove, GB;
The Solartron Electronic Group Limited, Farnborough, GB;
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.