Method and apparatus for determining the noise power ratio (NPR)

Details Method and apparatus for determining the noise power ratio (NPR) Method and apparatus for determining the noise power ratio (NPR)

1983-10-24

1986-08-26

Gruber, Felix D.

Boots, shoes, and leggings

324 57N, 324 77B, 328162, 364576, 455115, G01R 2926, G06F 15332

Patent

active

046086471

ABSTRACT:
The present invention describes a method and apparatus for determining the noise power ratio (NPR) of a unit under test (UUT). According to the method, a frequency domain representation of a desired test spectrum is generated by prompting an operator to input selected parameters to a general purpose digital computer. The desired test spectrum includes a notch of predetermined depth. The frequency domain representation is transformed into an input signal sequence by an inverse Fast Fourier Transform algorithm, the sequence defining a time domain representation thereof. The input signal sequence is then applied to the unit under test. An output signal sequence defining a time domain representation of a measured test spectrum is received from the unit under test and transformed back into a frequency domain representation. This frequency domain representation includes a notch whose depth is normalized in dB to determine the noise power ratio of the unit under test.

REFERENCES:
patent: 3355668 (1967-11-01), Boensel et al.
patent: 3693076 (1972-09-01), Nugent et al.
patent: 3825835 (1974-07-01), Hammett et al.
patent: 3978401 (1976-08-01), Lum
patent: 4286326 (1981-08-01), Houdard
B. P. Lath, "Modern Digital & Analog Communication Systems" 1983, pp. 16-37 and 454-460 Textbook, Holt, Rinehart and Winston (Publishers).

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