Method and device for detecting two different frequency amplitud

Details Method and device for detecting two different frequency amplitud Method and device for detecting two different frequency amplitud

1976-11-15

1978-01-10

Smith, Jerry

Boots, shoes, and leggings

324 79D, 328139, G06F 1520, G01R 2314

Patent

active

040683095

ABSTRACT:
Method for detecting, in a combined digital signal, the presence of two signals differing in frequency, amplitude and phase and having frequencies occurring in a known series. Samples of the combined signal are multiplied by samples of only one derivative of each of the frequencies of the known series. This derivative is formed by the product of a modulating factor formed by the samples of a frequency which is the sum or the difference of (a) a fixed frequency of 2000 Hz and the frequency to be detected in the known series and (b) a factor allowing a filtering at the said fixed frequency and formed by the samples of the sine of the fixed frequency shifted by 45.degree.. These products are alternately stored in accumulators until after a certain time the presence of certain frequencies is deduced from the sum of the products in the accumulators by means of comparison.

REFERENCES:
patent: 3526842 (1970-09-01), Andrew
patent: 3803390 (1974-04-01), Schaepman
patent: 3820021 (1974-06-01), Clarisse

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