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US 7,383,031 B2Granted
Receiving circuit for radio-wave clock broadcast wave
AssigneeSanyo Electric Co., Ltd.
InventorFumihiro Sasaki
Life of this patent
Estimating the term…
Abstract
A receiving circuit for a radio-wave clock broadcast wave having a frequency converter that converts a received signal of the radio-wave clock broadcast wave into a signal of a frequency in the bandwidth of an AM radio broadcast. The converted-into signal is input to a first high frequency amplifier of an AM radio receiver of a heterodyne type comprising the amplifier, an oscillator, a frequency mixer generating a signal of an intermediate frequency, an intermediate frequency amplifier amplifying the signal of the intermediate frequency, and a detector. Time correction is performed on the basis of a demodulated signal of the radio-wave clock broadcast wave output from the detector.
Claims25
A receiving circuit for a radio-wave clock broadcast wave comprising:
- a receiver for an AM radio broadcast wave which includes:
- a first high frequency amplifier that amplifies a received signal of the AM radio broadcast wave,
- an oscillator,
- a frequency mixer that mixes a signal output from the first high frequency amplifier with an oscillating signal of a first frequency generated by the oscillator thereby generating a signal of an intermediate frequency,
- an intermediate frequency amplifier that amplifies the signal of the intermediate frequency, and
- a detector that demodulates a signal output from the intermediate frequency amplifier;
- a second high frequency amplifier that amplifies a received signal of the radio-wave clock broadcast wave;
- a frequency converter that mixes a signal output from the second high frequency amplifier with an oscillating signal of a third frequency thereby converting into a signal of a frequency in a bandwidth of the AM radio broadcast wave;
- and
- a control circuit that makes the signal of the frequency in the AM radio broadcast wave bandwidth converted into by the frequency converter be input to the first high frequency amplifier and supplies a demodulated signal of the radio-wave clock broadcast wave that is output from the detector to a circuit performing time correction on the basis of the demodulated signal.
7 more elements
A receiving circuit for a radio-wave clock broadcast wave comprising:
- a receiver for an AM radio broadcast wave which includes:
- a first high frequency amplifier that amplifies a received signal of the AM radio broadcast wave,
- an oscillator,
- a frequency mixer that mixes a signal output from the first high frequency amplifier with an oscillating signal of a first frequency generated by the oscillator thereby generating a signal of an intermediate frequency,
- an intermediate frequency amplifier that amplifies the signal of the intermediate frequency, and
- a detector that demodulates a signal output from the intermediate frequency amplifier to produce a demodulated signal;
- a second high frequency amplifier that amplifies a received signal of the radio-wave clock broadcast wave;
- a frequency converter that mixes a signal output from the second high frequency amplifier with an oscillating signal of a third frequency thereby converting into a signal of a frequency in a bandwidth of the AM radio broadcast wave;
- and
- a control circuit that switches two operating modes that are a first operating mode where the received signal of the AM radio broadcast wave is input to the first high frequency amplifier and where the demodulated signal is output to a low frequency amplifier to reproduce the AM radio broadcast, and a second operating mode where the signal of the frequency in the AM radio broadcast bandwidth converted into by the frequency converter is input to the first high frequency amplifier and where a demodulated signal of the radio-wave clock broadcast wave that is output from the detector is supplied to a circuit performing time correction on the basis of the demodulated signal.
7 more elements
A receiving circuit for a radio-wave clock broadcast wave comprising:
- a receiver for an AM radio broadcast wave which includes:
- a first high frequency amplifier that amplifies a received signal of the AM radio broadcast wave,
- a first oscillator,
- a first frequency mixer that mixes a signal output from the first high frequency amplifier with an oscillating signal of a first frequency generated by the first oscillator thereby generating a signal of a first intermediate frequency,
- a second oscillator,
- a second frequency mixer that mixes the signal of the first intermediate frequency generated by the first frequency mixer with an oscillating signal of a second frequency generated by the second oscillator thereby generating a signal of a second intermediate frequency,
- an intermediate frequency amplifier that amplifies the signal of the second intermediate frequency, and
- a detector that demodulates a signal output from the intermediate frequency amplifier to produce a demodulated signal;
- a second high frequency amplifier that amplifies a received signal of the radio-wave clock broadcast wave;
- a frequency converter that mixes a signal output from the second high frequency amplifier with an oscillating signal of a third frequency thereby converting into a signal of a frequency in a bandwidth of the AM radio broadcast wave;
- and
- a control circuit that switches two operating modes that are a first operating mode where the received signal of the AM radio broadcast wave is input to the first high frequency amplifier and where the demodulated signal is output to a low frequency amplifier to reproduce the AM radio broadcast, and a second operating mode where the signal of the frequency in the AM radio broadcast bandwidth converted into by the frequency converter is input to the first high frequency amplifier and where a demodulated signal of the radio-wave clock broadcast wave that is output from the detector is supplied to a circuit performing time correction on the basis of the demodulated signal.
9 more elements
Dependencies are inferred from the claim text.