Tuner for reception of a broadband radio frequency signal
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United States of America Patent
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Jun 26, 2007
Grant Date -
Dec 30, 2004
app pub date -
Apr 29, 2004
filing date -
May 7, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A tuner is provided for selecting a channel from a broadband radio frequency input signal containing a plurality of channels, such as a terrestrial broadcast signal. The tuner has an input which supplies the broadband signal to a filter. The output of the filter is connected to a mixer of a single frequency changer, which converts the selected channel to a predetermined non-zero intermediate frequency. The filter is a tracking radio frequency filter which tracks the frequency of the selected channel so as to attenuate the image channel. A controller receives from a demodulator a signal representing reception quality, such as bit error rate, and adjusts the tracking of the filter so as to achieve acceptable reception quality, such as an adequately low bit error rate. Alignment of the filter during manufacture is not, therefore, required.
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