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US 10,680,862 B2Granted
Receiver, reception method for receiving FSK signals
AssigneeJVC KENWOOD Corporation
InventorsKoji Hirose, Toru Fujimoto
Life of this patent
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Abstract
A mixer is connected to a signal generator and an antenna and outputs a signal at an intermediate frequency. A PLL demodulator subjects the signal at the intermediate frequency from the mixer to PLL demodulation. An amplifier amplifies a signal from the PLL demodulator. A detector detects an amount of shift occurring in the PLL demodulator. A detector detects a gain of the amplifier. An FSK demodulator subjects a signal from the amplifier to FSK demodulation. An AFC unit detects a frequency offset in the signal from the amplifier and causes the signal generator to make a correction for the frequency offset detected.
Claims5
A receiver provided with (1) a preparation mode and (2) a reception mode, the receiver comprising:
- a signal generator;
- a mixer that is connected to the signal generator and an antenna and outputs a signal at an intermediate frequency;
- a PLL demodulator that subjects the signal at the intermediate frequency from the mixer to PLL demodulation;
- a detector that detects an amount of shift occurring in the PLL demodulator;
- an FSK demodulator that subjects a signal from the PLL demodulator to FSK demodulation;
- and
- an AFC unit that detects a frequency offset in the signal from the PLL demodulator and causes the signal generator to make a correction for the frequency offset detected,
- wherein in (1) the preparation mode,
- the signal generator outputs the signal at the intermediate frequency,
- the mixer outputs the signal at the intermediate frequency from the signal generator, and
- the detector detects the amount of shift in the signal from the PLL demodulator, and
- wherein in (2) the reception mode,
- the signal generator outputs a local oscillation signal,
- the mixer outputs the signal at the intermediate frequency based on the local oscillation signal from the signal generator and a signal at a radio frequency from the antenna,
- the FSK demodulator performs FSK demodulation by using the amount of shift detected by the detector, and
- the AFC unit detects the frequency offset by using the amount of shift detected by the detector.
13 more elements
A receiver provided with (1) a preparation mode and (2) a reception mode, the receiver comprising:
- a signal generator;
- a mixer that is connected to the signal generator and an antenna and outputs a signal at an intermediate frequency;
- a PLL demodulator that subjects the signal at the intermediate frequency from the mixer to PLL demodulation;
- an amplifier that amplifies the signal from the PLL demodulator;
- a detector that detects a gain of the amplifier;
- and
- an FSK demodulator that subjects the signal from the amplifier to FSK demodulation,
- wherein in (1) the preparation mode,
- the signal generator outputs the signal at a zeroth frequency (f0), a signal at a first frequency (f1>f0), and a signal at a second frequency (f2<f0) in a band of the intermediate frequency,
- the mixer outputs the signal at the zeroth frequency (f0), the signal at the first frequency (f1>f0), and the signal at the second frequency (f2<f0) from the signal generator,
- the detector detects a zeroth voltage in the case of the zeroth frequency (f0) and detects a gain based on a first voltage in the case of the first frequency (f1) and a second voltage in the case of the second frequency (f2), and
- wherein in (2) the reception mode,
- the signal generator outputs a local oscillation signal,
- the mixer outputs the signal at the intermediate frequency based on the local oscillation signal from the signal generator and a signal at a radio frequency from the antenna,
- the amplifier amplifies the signal from the PLL demodulator by the gain detected by the detector, and
- the FSK demodulator performs FSK demodulation by using the zeroth voltage detected by the detector.
13 more elements
A reception method adapted for a receiver including:
- a signal generator;
- a mixer that is connected to the signal generator and an antenna and outputs a signal at an intermediate frequency;
- a PLL demodulator that subjects the signal at the intermediate frequency from the mixer to PLL demodulation;
- a detector that detects an amount of shift occurring in the PLL demodulator;
- an FSK demodulator that subjects the signal from the PLL demodulator to FSK demodulation;
- and an AFC unit that detects a frequency offset in the signal from the PLL demodulator and causes the signal generator to make a correction for the frequency offset detected, the receiver being provided with (1) a preparation mode and (2) a reception mode, the reception method comprising:
- in (1) the preparation mode,
- outputting, using the signal generator, the signal at the intermediate frequency;
- outputting, using the mixer, the signal at the intermediate frequency from the signal generator;
- and
- detecting, using the detector, the amount of shift in the signal from the PLL modulator, and
- in (2) the reception mode,
- outputting, using the signal generator, a local oscillation signal;
- outputting, using the mixer, the signal at the intermediate frequency based on the local oscillation signal from the signal generator and a signal at a radio frequency from the antenna;
- performing, using the FSK demodulator, FSK demodulation by using the amount of shift detected by the detector;
- and
- detecting, using the AFC unit, the frequency offset by using the amount of shift detected by the detector.
14 more elements
Dependencies are inferred from the claim text.