Television receivers and methods for processing signal sample streams synchronously with line/frame patterns
AssigneeEricsson Inc.
InventorPaul Dent
Life of this patent
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Abstract
Television receivers receieve a television signal and downconvert the television signal to generate a complex baseband signal. The complex baseband signal is differeniated and then integrated to reduce a direct current (DC) offset in the complex baseband signal. The television receiever may include a periodic known information field. The known information field is correlated with the integrated signal to determine a residual offset therein that is associated with a constant used in integrating the differentiated complex baseband signal. The residual offset is substracted from this constant when integrating the differeniated complex baseband signal.
Claims37
A multi-mode television picture receiving apparatus, comprising:
- a radio frequency (RF) circuit that is configured to generate a complex baseband signal responsive to a television picture signal received from a television transmitter;
- an analog-to-digital (A/D) converter that generates digital samples responsive to the complex baseband signal;
- and
- a digital signal processing (DSP) circuit that is configured to generate decoded color video signals responsive to the digital samples, the DSP circuit being switchable between a first decoding mode for an analog television standard and a second decoding mode for a digital television standard.
A television picture receiving apparatus, comprising:
- a direct conversion radio frequency (RF) circuit that comprises a quadrature converter circuit, the quadrature converter circuit being configured to generate a complex baseband signal responsive to a television picture signal received from a television transmitter;
- an offset canceller circuit that is configured to attenuate a direct current (DC) offset in the complex baseband signal;
- an analog-to-digital (A/D) converter that is configured to generate numerical samples responsive to the complex baseband signal;
- and
- a digital signal processing (DSP) circuit that is configured to generate decoded color video signals responsive to the numerical samples.
A method of operating a television receiver, comprising:
- receiving a television signal;
- downconverting the television signal to generate a complex baseband signal;
- differentiating the complex baseband signal;
- and
- integrating the differentiated complex baseband signal to generate an integrated output signal.
A method of operating a television receiver, comprising:
- receiving a first television signal on a first channel, the first television signal comprising a first known information field;
- receiving a second television signal on a second channel, the second television signal comprising a second known information field;
- downconverting the first television signal to generate a first complex baseband signal;
- downconverting the second television signal to generate a second complex baseband signal;
- storing samples of the first and second complex baseband signals in a memory;
- and
- filtering the stored samples of the first and second complex baseband signals by processing the stored samples in forward and reverse time order.
A television receiver, comprising:
- a downconvertor circuit that generates a complex baseband signal responsive to a television signal;
- a differentiator circuit that generates a differentiated complex baseband signal responsive to the complex baseband signal;
- and
- an integrator circuit that generates an integrated output signal responsive to the differentiated complex base band signal.
A television receiver, comprising:
- a first downconvertor circuit that generates a first complex baseband signal responsive to a first television signal received on a first channel, the first television signal comprising a first known information field;
- a second downconvertor circuit that generates a second complex baseband signal responsive to a second television signal received on a second channel, the second information signal comprising a second known information field;
- a memory that has samples of the first and second complex baseband signals stored therein;
- and
- a filter circuit that filters the stored samples of first and second complex baseband signals in forward and reverse time order.
Dependencies are inferred from the claim text.