Title :
Direct conversion-how to make it work in TV tuners
Author :
Aschwanden, Felix
Author_Institution :
Lab. RCA Ltd., Zurich, Switzerland
fDate :
8/1/1996 12:00:00 AM
Abstract :
The problems of direct conversion tuners are briefly discussed and solutions are presented to automatically correct the inherent gain and phase errors using digital signal processing. We have built a hardware prototype for reception of analog and digital signals to carry out experiments. The direct conversion affects also the design of the preselection in the RF and IF filters, the local oscillator and to some extent the AGC system (automatic gain control). Novel ideas are discussed that perform an important advance towards an alignment-free tuner
Keywords :
UHF filters; UHF oscillators; automatic gain control; digital filters; digital television; error correction; frequency convertors; matched filters; television receivers; tuning; video signal processing; AGC system; IF filters; RF filters; TV tuners; alignment-free tuner; analog signals; automatic gain control; digital signal processing; digital signals; direct conversion tuners; gain errors; hardware prototype; local oscillator; phase errors; preselection; reception; Digital signal processing; Error correction; Filters; Gain control; Hardware; Local oscillators; Prototypes; Radio frequency; TV; Tuners;
Journal_Title :
Consumer Electronics, IEEE Transactions on
