What does negative polarity modulation indicate about the carrier level?

Negative polarity modulation is a technique used in video transmission where the intensity of the carrier signal is inversely related to the brightness of the image being transmitted. When the picture gets brighter, the modulation reduces the level of the carrier signal, leading to a decrease in the overall carrier level. This means that as brighter portions of the image appear, there is a corresponding drop in the carrier level, effectively encoding the brightness information in a manner that allows the receiver to interpret it accurately.

In this context, it becomes clear that when the image appears lighter or brighter, the carrier level diminishes, which aligns perfectly with the characteristics of negative polarity modulation. Thus, this modulation technique creatively conveys image data by adjusting the carrier in a way that directly reflects the visual representation of brightness.