Television – Receiver circuitry – Tuning
Patent
1998-02-12
2000-10-17
Kostak, Victor R.
Television
Receiver circuitry
Tuning
348733, 348678, H04N 550
Patent
active
061339652
ABSTRACT:
A high definition television tuner includes a frequency compensated PI type PIN diode attenuator with the current through the series diode controlled separately from the current through the shunt diodes. A look-up table contains information that correlates the selected RF frequency and the desired AGC level with input data for two D/A converters. A microprocessor controls the D/A digital data, which is based upon information provided by a digital signal processing circuit. In one embodiment of the invention, the look-up table is connected between a D/A converter and a microprocessor and the microprocessor controls the look-up table for supplying the digital data to the D/A converters. In another embodiment, the microprocessor, after receiving the desired AGC level information, first interrogates the look-up table, then supplies the digital data to the D/A converter based.
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Kostak Victor R.
Zenith Electronics Corporation
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