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US 7,499,694 B1Granted
Tuner alignment
AssigneeNXP B.V.
InventorsAlan Chin Leong Yeo, Han Leng Paxton Tan, Johannes Hubertus Antonius Brekelmans
Life of this patent
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Abstract
In a method of tuning a receiver for a digital signal (MPEG2-TS), an input signal (RF-in) is filtered (In-filt, Band-filt) to obtain a processed signal, a digital figure of merit (BER) is determined (Mix/Osc/IF amp IF-downconv-2, C) from the processed signal, and the filtering step (In-filt, Band-filt) is fine-adjusted (μP, PLL, DAC1-DAC3) in dependence on the digital figure of merit (BER).
Claims9
A receiver for a digital signal, the receiver comprising:
- one or more filters that are configured to filter an input signal to obtain a processed signal, wherein the one or more filters include:
- an input filter;
- and
- a double tuned band-filter;
- a decoder that is configured to determine a digital figure of merit from the processed signal;
- and
- a controller that is configured to determine a center frequency of at least one of the one or more filters by determining a point of inflection of said digital figure of merit by:
- incrementally adjusting said center frequency in a first direction;
- determining a degradation in said figure of merit;
- incrementally adjusting said center frequency in a second direction;
- determining a degradation in said figure of merit;
- and
- adjusting said center frequency in said first direction, wherein a center frequency of each of said other filters is held stationary.
10 more elements
A method comprising:
- receiving an RF input signal,
- filtering the RF input signal via one or more RF filters to provide a filtered RF signal,
- mixing the filtered RF signal with an oscillator signal to provide an IF signal,
- demodulating the IF signal to provide a digital output signal and a figure of merit associated with the digital output signal, and
- adjusting at least one filter of the one or more RF filters based on the figure of merit by:
- incrementally adjusting said center frequency in a first direction;
- determining a degradation in said figure of merit;
- incrementally adjusting said center frequency in a second direction;
- determining a degradation in said figure of merit;
- and
- adjusting said center frequency in said first direction, wherein said center frequency of each of said other RF filters is held stationary.
8 more elements
Dependencies are inferred from the claim text.