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:
Sep. 09, 1986
Filed:
Jun. 29, 1984
Mark Rapaich, Stevensville, MI (US);
Heath Company, Benton Harbor, MI (US);
Abstract
A real-time, microprocessor-controlled, 1/2-octave audio spectrum analyzer is capable of operating in a difference mode wherein a current input may be compared with a previously stored input and the difference therebetween directly displayed in real time. A reference response may be displayed and stored in memory for later comparison with another audio signal for which a spectrum analysis is desired. For example, if an output from a pink noise generator is stored as the reference spectrum and the output from a speaker is the audio signal to be measured, the difference mode of operation will subtract the frequency response of the speaker from that of the noise generator and display the difference. Thus, it is not necessary to take into account frequency response errors of the reference signal source in making highly accurate spectral comparisons.