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:
Jan. 12, 1982
Filed:
Dec. 07, 1979
Shoji Niki, Gyoda, JP;
Abstract
An input signal frequency and the output from a local oscillator are applied to a frequency converter to derive therefrom intermediate-frequency signals of frequencies corresponding to the differences between the input signal frequency and the output frequency of the local oscillator and between the former and harmonic frequencies of the latter. The intermediate-frequency signals are amplified by an amplifier, and the output freqeuncy of the amplifier and the oscillation frequency of the local oscillator are simultaneously measured twice. From intermediate frequencies F.sub.i1 and F.sub.i2 and the local oscillation frequencies F.sub.1 and F.sub.2 thus measured, the following calculation is made: ##EQU1## where .alpha. is zero or a decimal. At the same time, it is detected which one of the intermediate frequencies F.sub.i1 and F.sub.i2 is larger, and from the result of this determination, the above-mentioned N, the local oscillation frequency and the intermediate frequency corresponding thereto, the input signal frequency is calculated.