Boots – shoes – and leggings
Patent
1979-12-07
1982-01-12
Wise, Edward J.
Boots, shoes, and leggings
455147, G06F 1520, G01R 2300
Patent
active
043108911
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.
REFERENCES:
patent: 3909599 (1975-09-01), Trott, Jr. et al.
patent: 4093988 (1978-06-01), Scott
patent: 4106096 (1978-08-01), Paoli
Takeda Riken Kogyo Kabushiki Kaisha
Wise Edward J.
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