Moire measurement system using spectral analysis

Details Moire measurement system using spectral analysis Moire measurement system using spectral analysis

1992-05-06

1993-07-27

Wieder, Kenneth A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

324404, 324612, H04N 1702

Patent

active

052314898

ABSTRACT:
A Moire measurement system uses spectral analysis to characterize the moire effect on a television signal introduced by a particular device. A known television signal is processed by the particular device, such as a video tape recorder, and the output is input to a spectral analyzer, such a windowed fast Fourier transform. The spectral analyzer includes input gating to select a portion of the known television signal from the particular device. The frequency of the desired component of the known television signal, together with the rms values of all the other components introduced by the Moire effect, give the X- and Y-coordinates of a point on an output display. The window is moved across the test signal, giving a family of X- and Y-coordinates that characterize the Moire effect as a function of amplitude, frequency or video pedestal. The Moire characteristics of the particular device then may be used to correct the output of the particular device.

REFERENCES:
"Moire Effects in the Reproduction of TV Signals by VTR Machines" by M. S. Tooms, C. Eng., M.I.E.E., M.I.E.R.E., pp. 4-10, vol. 13, No. 1, Jan./Feb. 1970 of The Royal Television Society Journal.
"Moire Effects in Professional Videotape Recorders", pp. 440-441, vol. 9 No. 19, Sep. 20, 1973 of Electronics Letters.

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