Patent ID: 6229560
Filing Date: 2001-05-08
Classification: H04N

Abstract:
An apparatus for determining co-channel NTSC interference, comprising:a data processing circuit receiving input data, and outputting digital data and a data field signal of the digital data;a pattern generator generating a reference data field signal from the data field signal of the digital data;a comb filtering circuit filtering the data field signal and the reference data field signal;a determination circuit comparing a first mean square error between the data field signal and the reference data field signal received from the comb filtering circuit with a second mean square error between the data field signal and the reference data field signal, said determination circuit determining the presence of co-channel interference utilizing the compared result of the first and the second mean square errors;a selection circuit receiving the comb filtered digital data from the comb filtering circuit and the digital data from the data processing circuit, said selection circuit selecting and outputting one of either the comb filtered digital data or the digital data according to the determination of the determination circuit;a first counting circuit counting up or down according to the determination of the determination circuit and depending upon the counted value, outputting a predetermined signal;a second counting circuit receiving the predetermined signal and counting up or down a reliability count value according to the predetermined signal, said second counting circuit sending a selection signal to the selection circuit depending upon the reliability count value; andwherein the selection circuit receives the selection signal and selects one of either the comb filtered digital data or the digital data.