Data slice circuit for slicing data carried on a video signal and a method thereof

摘要

A data slice circuit to separate data carried on a video signal only at a line on which the data is carried and a method thereof. The circuit includes a top peak detector to detect a top peak of an input video signal to generate a top peak detection signal and a bottom peak detector to detect a bottom peak of the video signal to generate a bottom peak detection signal. A composite synchronous signal separation circuit separates a composite synchronous signal from the video signal, and a clock run-in window circuit generates a first control signal for a clock run-in interval. A sampling/holding circuit samples an intermediate value between the top peak detection signal and the bottom peak detection signal in response to the first control signal of a first state, and holds the sampled intermediate value to generate a reference voltage in response to the first control signal of a second state. A second control signal generator receiving the composite synchronous signal generates a second control signal indicating a line on which data is carried, and a comparator circuit compares the video signal with the reference signal in response to the second control signal. Therefore, the data slice circuit performs a data slice operation only at the line on which the data is carried.