DEVICE FOR DOWN-TRANSFORMING THE FREQUENCY OF SIGNALS

摘要

Device for down-transforming the frequency of signals, for examp le radio and/or television signals. The device comprises a transformer unit with quadrature channels for transforming the signals into quadrature signals of a lower frequency. The device further comprises a filter unit for suppressing mirror frequencies. The filter unit comprises an amplitude and phase correction filter for correcting the quadrature signals and a correction control unit for controlling the filter. The device further comprises a frequency generator which supplies reference signals having a frequency within the frequency band of the mirror signals to the input of the transformer unit.