Patent ID: 6166594
Filing Date: 2000-12-26
Classification: H04B

Abstract:
A demodulating arrangement comprising:a reference signal source arranged to produce a substantially distortion free reference signal at a selected one of a plurality of channel frequencies;an input arranged to receive an external source signal at the selected channel frequency;a switch arranged to selectively pass the substantially distortion free reference signal and the external source signal in order to provide a switch output;a tuner arranged to tune to the switch output in order to provide a tuner output;a demodulator arranged to demodulate the tuner output;a calibration filter;an equalizer; and,a controller, wherein the controller is arranged to control the switch, the tuner, the calibration filter, and the equalizer so that the switch is arranged to connect the substantially distortion free reference signal to the tuner each time the tuner is tuned to a new channel, so that the tuner is tuned to the reference signal, so that the calibration filter is initially set to pass the reference signal to the equalizer, and so that the equalizer calibrates the calibration filter according to demodulator caused distortion in the reference signal.