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:
Nov. 03, 1987
Filed:
Dec. 13, 1985
Jurgen Kasser, Diekholzen, DE;
Blaupunkt-Werke GmbH, Hildesheim, DE;
Abstract
For elimination of pulse type interference in an FM receiver by intermittent blanking of the received signal while interfering pulses are present and substitution of a synthetic signal during the blanking intervals, the synthetic signal substituted during the blanking intervals is produced by interpolation using finite duration impulse response digital filters, instead of using the last undisturbed value of the received signal modified by integration of its last value of rate of change with respect to time. The determination of the blanking interval is optimized by reference to the maximum and minimum peak values of the output of an AM detector of the received signal and comparing an interference signal magnitude thus obtained with a threshold value of the interference signal, so as to define the blanking interval as the interval during which the interference signal exceeds the reference signal value. The interference signal compared with the reference value is produced by computing the sum and product of the maximum and minimum peak values, adding the product to the output of the squarer operating on the output of the AM demodulator, multiplying the sum of the maximum and minimum peak values by the AM demodulator output, dividing the product plus squarer sum by the multiplied output of the AM demodulator, forming the arc cosine of the output of the divider and then differentiating the arc cosine value.