زيادة المناعة الضجيجية في نظام التلفزة

Quite a number of measures are taken in the amplifier section of TV system to minimize the noise content of the TV signal and the visibility of spurious components in the picture. Notably, the level of fluctuation noise is brought down through a proper design of input circuits, noise cancellation, and noise suppression. These measures are important as they enhance the sensitivity of the system, but one ought not neglect the fact that the compensation of any impairment in the TV signal is, as a rule, accompanied by a rise in the noise level. This paper presents a simple method to increase the signal-noise ratio by linear filtration with out any impact on the picture resolution.