Volume 34 #3

Contents

1. Variability of the pattern VEP parameters in children without visual impairment and questions of preclinical diagnostics
2. Three tactics for gene therapy of two congenital retinal diseases. Review
3. Discrimination of rippled spectra with different ripple densities
4. Method of iterative tomography reconstruction of cropped sinograms
5. ANALYSIS OF A STOPPING METHOD FOR TEXT RECOGNITION IN VIDEO STREAM USING AN EXTENDED RESULT MODEL WITH PER-CHARACTER ALTERNATIVES
6. Recognition of projectively transformed planar figures. XIV. New methods for projectively-invariant description of ovals, using an H-polar curve and dual points
7. Radial distortion correction for camera submerged under water

Discrimination of rippled-spectrum signals depending on the standard ripple density was studied. The measurements were performed using a tree-alternative forced-choice procedure at signal center frequencies of 1, 2 and 4 kHz. Thresholds of ripple-density difference increased with increasing the standard ripple density. At standard ripple densities of 2 to 10 cycles/oct, thresholds were nearly equal for signal frequencies of 1 to 4 kHz. They were from 0.06 cycle/oct at a standard density of 2 cycle/oct to 5–7 cycle/oct at a standard density of 10 cycle/oct. Signal couldnot be discriminate at standard ripple densities above 10 cycle/oct and signal frequencies of 1 and 2 kHz. At a signal frequency of 4 kHz, signals could be discriminated at standard ripple densities above 20 cycle/oct. Discrimination of signal at a center frequency of 4 kHz and ripple densities above 10 cycle/oct can be explained by temporal processing, whereas discrimination at ripple densities below 10 cycle/oct can be explained by frequency processing.

Key words: rippled spectra, ripple density, excitation-pattern analysis, temporal-processing analysis

DOI: 10.31857/S0235009220020109

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