Method of and apparatus for tuning an aft-controlled channel...

H - Electricity – 04 – B

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H04B 1/16 (2006.01) H03J 5/02 (2006.01)

Patent

CA 1072230

METHOD OF AND APPARATUS FOR TUNING AN AFT-CONTROLLED CHANNEL SELECTED APPARATUS TO A DESIRED FREQUENCY ABSTRACT OF THE DISCLOSURE A method of and apparatus for tuning an AFT-controlled channel selecting apparatus of the type having a storage device for storing digital representations corresponding to predetermined channel frequencies from which a selected representation is read out and converted to a control voltage which is applied to a controllable tuning element included in an electronic tuner. When the control voltage is applied, generally it experiences a gradual increase in magnitude until its predetermined control voltage level is attained. The automatic fine tuning (AFT) circuit may pull in a frequency corresponding to the instantaneous level of the control voltage during the gradual increase in magnitude thereof. To avoid tuning the electronic tuner to such an unwanted pulled-in frequency, the AFT operation is carried out at a rela- tively slow rate when the tuning of the tuner approaches the frequency corresponding to the read out representation and then at a relatively fast rate when the tuner is tuned to a frequency that deviates from the desired frequency within a predetermined range. -i-

266087

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