An efficient filter circuit and method for filtering a loss of receiver signal prevents false signals caused by glitches. The short glitches that happen at the positive edge of the clock signal may be prevented from affecting the whole clock cycle. The false signal removal circuitry is effective against both false active high and false active low signals. A selectable majority determination block also measures the number of glitches or average signal strength to determine that a valid signal is present. A mininum pulse width of a glitch is settable.