Signal processing device and direct conversion reception device
AssigneeNEC Corporation
InventorNoriaki Matsuno
Life of this patent
Estimating the term…
Abstract
A base band signal input from an input terminal (10) has a DC component which is blocked off by a high pass filter (12). When the signal which has passed through the high pass filter (12) has a voltage out of a predetermined set voltage range, the signal of the voltage portion out of the voltage range is extracted by a signal extraction circuit (15). According to the signal extracted, the DC potential of the base band signal is adjusted at a feedback point (17).
Claims43
A signal processing device which includes an input unit which inputs a signal, a signal processing unit which processes the input signal, and an output unit which outputs the processed signal, characterized in that
- the signal processing unit comprises direct current component cutoff means for cutting off a direct current component of the input signal, signal extraction means for extracting a signal corresponding to a voltage portion in which a voltage of a signal passing through said direct current component cutoff means falls outside a predetermined voltage range, and direct current potential regulation means for regulating and outputting a direct current potential of a processing target signal on the basis of the extracted signal.
A direct conversion reception device characterized by comprising:
- mixing means for frequency-mixing a received high-frequency signal and an oscillation signal and converting the resultant signal into a baseband signal;
- extraction means for extracting a signal corresponding to a voltage portion outside a predetermined voltage range from the baseband signal;
- and
- regulation means for regulating a direct current potential of the baseband signal on the basis of the extracted signal.
Dependencies are inferred from the claim text.