Comb filter for television signals having adaptive features
Suppression of chrominance signal contamination of the luminance signal in a video signal processing system
Comb filter having improved luminance response
Comb filter circuit
Comb filter device
Color demodulation device for use in color television receivers
Video signal processing unit
Carrier chrominance signal separating circuit Patent #: 4570177
ApplicationNo. 06/724647 filed on 04/18/1985
US Classes:348/666Including adaptive artifacts removal (e.g., switchable trap or LPF in luma channel)
ExaminersPrimary: Groody, James J.
Assistant: Dunnam, Michael P.
Attorney, Agent or Firm
International ClassH04N 9/78 (20060101)
AbstractControl signal generator is responsive to the output of a pair of correlation indicators. One correlation indicator provides an indication of the presence or absence of correlation between high frequency components derived without difference in delay from the respective luminance and chrominance outputs of a color TV receiver's comb filter system. The other correlation indicator provides an indication of the presence or absence of correlation between high frequency components derived with a difference in delay from the respective comb filter outputs, the delay difference corresponding to a quarter period at the nominal color subcarrier frequency. Control signal is developed in response to a correlation indication by either or both of the indicators. The luminance output of the comb filter is subjected to high frequency component removal during control signal development.