Method of increasing the dynamic range and reducing quantization noise of video signals

摘要

The full range of available steps provided by n-bit samples is utilized to digitalize television line picture signals of a composite video signal. The synchronizing signals in the blanking intervals which separate the picture signals of successive television lines are confined to the same range of multibit word values as the television line picture signals. This reduces quantization noise in the picture signals. The necessary processing may precede digitalization and be performed by superposing a d.c. voltage in the blanking intervals of a standard composite television signal so as to shift the voltage range of the synchronizing signals and bring them within the voltage range of the picture signals, or it may be performed after digitalization by interposing a digital synchronizing signal, obtained from a store, having a same multibit word value range as the digitalized picture signals, into the blanking intervals.