Boots – shoes – and leggings
Patent
1981-03-17
1983-11-22
Wise, Edward J.
Boots, shoes, and leggings
324 57DE, H04B 346, G06F 1520
Patent
active
044173105
ABSTRACT:
An apparatus for measuring a distortion factor of an analog input signal comprises a frequency multiplier for producing a sampling signal having a frequency of the input signal multiplied by N, an analog to digital converter for successively converting instantaneous values of the input signal into digital values, a memory circuit for storing the converted digital values at given address positions in the memory circuit, a digital to analog converter for reading out the digital values stored in the memory circuit in a correct phase sequence at a given reading-out frequency and converting read-out digital values into analog values, a filter tuned to a frequency equal to the reading-out frequency divided by N and filtering out a fundamental component of the input signal, and a level meter for measuring a level of an output signal supplied from the filter. The distortion factor is calculated from a measured level of the output signal from the filter and a level of the fundamental component.
REFERENCES:
patent: 3842247 (1974-10-01), Anderson
patent: 4093989 (1978-06-01), Flink et al.
patent: 4124818 (1978-11-01), Lin et al.
patent: 4125809 (1978-11-01), Mott
patent: 4264959 (1981-04-01), Blaass
patent: 4275446 (1981-06-01), Blaass
patent: 4301536 (1981-11-01), Favin et al.
Field Lawrence I.
Shibasoku Company Limited
Wise Edward J.
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