FM receiver that receives fm signal and method for receiving FM signal
AssigneeJVC KENWOOD Corporation
InventorYasuhide Okuhata
Life of this patent
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Abstract
A quadrature detector quadrature-detects an FM signal. An FM detector generates a detection signal by FM detecting an FM signal that has been quadrature-detected. An AFC unit generates a control signal for controlling a frequency of a local oscillation signal used for quadrature detection on the basis of the generated detection signal, and feeds back the control signal to a local oscillator that should output the local oscillation signal. A difference calculator generates a difference signal representing a difference from a reference value on the basis of the generated detection signal. An addition unit adds the generated difference signal and the generated detection signal.
Claims3
An FM receiver comprising:
- a quadrature detection device that quadrature-detects an FM signal;
- an FM detector that generates a detection signal by FM detecting an FM signal that has been quadrature-detected in the quadrature detection device;
- an AFC unit that generates a control signal for controlling a frequency of a local oscillation signal used in the quadrature detection device on the basis of the detection signal generated in the FM detector, and feeds back the control signal to a local oscillator that should output the local oscillation signal;
- a difference calculator that generates a differential signal between the detection signal and a reference value that generated the detection signal of a predetermined timing in the FM detector;
- and
- an addition unit that adds the difference signal generated in the difference calculator and the detection signal generated in the FM detector.
A method for receiving an FM signal comprising:
- quadrature-detecting an FM signal;
- generating a detection signal by FM detecting an FM signal that has been quadrature-detected;
- generating a control signal for controlling a frequency of a local oscillation signal used in the quadrature-detecting on the basis of the generated detection signal, and feeding back the control signal to a local oscillator that should output the local oscillation signal;
- storing the detection signal generated at a predetermined timing as a reference value;
- generating a difference signal between the generated detection signal and the reference value;
- and
- adding the generated difference signal and the generated detection signal.
Dependencies are inferred from the claim text.