Trendy cinema auditorium in Madrid , Spain. The NTSC television system is termed analog because the alerts representing the picture and sound information can take on any value between the minimal and most limits. movie mania Specifically, the strength of the visible signal is inversely related to the picture brightness, with black parts of the picture having essentially the most transmitted power. This adverse modulation of the video data was discovered to reduce the impression of Gaussian white noise on the displayed image. Periodic pulses are included at powers greater than these used to symbolize black areas in the image. These pulses provide the timing info required to synchronize the transmitter and the receiver, allowing the image to be painted appropriately on the screen.