Tuner input filter with electronically adjustable center frequency for adapting to antenna characteristic
An input filter, center frequency technology, applied in the field of tuners, which can solve problems such as poor frequency response, poor adjacent channel performance, low gain, etc.
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[0025] now refer to figure 1 , shows a block diagram of the RF signal receiver 20 related to the present invention. Preferably, but not necessarily, the RF signal receiver 20 is of a type that accepts user connection to an antenna of unknown impedance for RF signal reception, rather than using a fixed antenna of known impedance. RF signal receiver 20 may be, and thus represents, any type of RF signal receiver such as a television, radio, VCR, television signal receiver, cellular telephone, wireless local area network, etc., to which a user may attach Antenna and generally an external antenna for receiving RF signals. In the following description of exemplary embodiments of the present invention, a television receiver is described as a representative example of a system suitable for incorporating the principles of the present invention. However, the principles discussed here in the context of a television receiver are applicable to any form of RF signal receiver. More specif...
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