a front end tuner for receiving tv signals and the like includes a frequency conversion circuit including a mixer for beating a local signal with received signals within a predetermined band of frequencies to provide selected signals within a predetermined band of frequencies to provide selected signals within a predetermined channel band of frequencies . a signal converter circuit generates digitally encoded signal representations of the selected signals . the frequency conversion circuit and the signal converter circuit are in a form of an integrated circuit within a semiconductor substrate . in a tv receiver , on - following digital processing of the digitally encoded signals is performed in a microcomputer . in one example a channel selection code is used by the microcomputer to synthesize the local oscillator signal and in another example the signal converter circuit is a codec , responsive to codes from the microprocessor , to supply a control voltage for controlling a local oscillator . from time to time channel selection is automatically fine tuned .