Abstract: An electric wave receiving apparatus obtains the received data in a partial period, and judges the timing of the received data in which partial data has been received by comparing the received data with the partial data. Thereby, the electric wave receiving apparatus performs correction of the second data of timing data.

Abstract: A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit. The detection circuit and AGC circuit generates an RF control signal Sf1 and IF control signal Sf2 from the input intermediate frequency signal Sa, and controls an RF control circuit and IF control circuit by outputting the generated RF control signal Sf1 and IF control signal Sf2 to the RF control circuit and IF control circuit. By this a radio wave reception device can speed up AGC operation.

Abstract: A frequency switching signal for switching a reception frequency of an antenna based on a reception success or failure signal output from a detection circuit and a standard time code output from a demodulator is output to a reception frequency selection circuit. The reception frequency is switched to the frequency which is the same as an intermediate frequency other than that of the standard radio waves, and at the same time, an output temporarily stopping signal is output to a local oscillation circuit to temporarily stop the output of a local oscillation signal of the local oscillation circuit, enabling to output the reception signal which was received by the antenna as the intermediate frequency signal without synthesizing and converting it in the frequency conversion circuit to be detected by a detection circuit. Thereby, the reception of the radio wave composed of a plurality of frequencies can be realized with a simple structure.

Abstract: A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit. The detection circuit and AGC circuit generates an RF control signal Sf1 and IF control signal Sf2 from the input intermediate frequency signal Sa, and controls an RF control circuit and IF control circuit by outputting the generated RF control signal Sf1 and IF control signal Sf2 to the RF control circuit and IF control circuit. By this a radio wave reception device can speed up AGC operation.

Abstract: Disclosed is a radio wave receiver including: a receiving unit to receive a radio wave including a time code in which a plurality of types of data pulse different in pulse width from one another are arranged with a predetermined period of time; a detection circuit to detect the time code in the radio wave received by the receiving unit to obtain a detected signal; a low-pass filter to pass low-frequency components in the detected signal detected by the detection circuit, a cutoff frequency of the low-pass filter being twice a transmit frequency of the data pulse or less; and a data distinction unit to distinguish the types of data pulse based on an output of the low-pass filter for at least one specific point of time during a transmit period of data pulse.

Abstract: An antenna device includes an antenna for receiving a time information radio wave, and an antenna support member. In the antenna, a coil is wound around a center portion of a core. In the support member, a non-magnetic portion supports two magnetic portions independently and both end portions of the core of the antenna are magnetically coupled with the magnetic portions. A radio wave controlled timepiece includes a case in an inner space of which the antenna and the support member are installed as described above. In the inner space, a time counting unit, a time display unit connected to the time counting unit, and a time updating unit configured to update the time displayed on the display unit, based on the time information radio wave received by the antenna, are installed.

Abstract: A time information receiver and radio controlled watch that receives a time code in which different data pulses are disposed one in a unit period. A composite signal waveform of a plurality of detected signals of the time code shifted sequentially by a unit period of 1 second is obtained by sample adders. A start point of each unit period is detected from the composite signal waveform as a seconds synchronization point where the receiver and watch is seconds-synchronized with the time code. An accurate seconds synchronization point is detected from the detected signal even when the same includes a considerable noise.

Abstract: A circuit for canceling noise components is provided for a radio wave receiver which receives a long wave standard radio wave. The circuit includes a multiplier, a divider, a differentiation circuit and an adder, and obtains a signal by shifting the phase of a carrier signal by 90 degrees, wherein the carrier signal has the same frequency and the same phase as those of the carrier of a received signal outputted from a carrier reproduction circuit. Thereby, it is possible to certainly remove the noises in the vicinity of a received frequency.

Abstract: A time information transmission-reception integrated circuit includes: a reception control circuit for detecting a signal obtained by receiving and amplifying an external radio wave, and generating a clock data signal, based on a carrier signal the phase of which is synchronized with the signal; and a transmission control circuit for generating an amplitude modulation signal obtained by modulating the amplitude of the carrier signal by the transmission time code, by a modulator, and transmitting a relaying radio wave from an antenna, the phase of the relaying radio wave synchronized with the phase of the external radio wave, by correcting the phase shift of the amplitude modulation signal by a phase shifter. Thereby, the phase shift between the external radio wave and the relaying radio wave is cancelled.

Abstract: In a receiving circuit 44 for receiving an electromagnetic wave signal, a frequency converter/detector circuit 100 comprises a local oscillator 131 for generating an oscillation signal, plural mixers 133, 134 for mixing the received electromagnetic wave signal with the oscillation signal to generate intermediate frequency signals having different phases, and a signal generating/synthesizing circuit 140 for generating based on the intermediate frequency signals generated by the mixers other intermediate frequency signals which are different in phase from the original intermediate frequency signals, for detecting the intermediate frequency signals and other intermediate frequency signal, and for adding the detected signals together to generate a synthesized signal.

Abstract: An antenna device includes an antenna for receiving a time information radio wave, and an antenna support member. In the antenna, a coil is wound around a center portion of a core. In the support member, a non-magnetic portion supports two magnetic portions independently and both end portions of the core of the antenna are magnetically coupled with the magnetic portions. A radio wave controlled timepiece includes a case in an inner space of which the antenna and the support member are installed as described above. In the inner space, a time counting unit, a time display unit connected to the time counting unit, and a time updating unit configured to update the time displayed on the display unit, based on the time information radio wave received by the antenna, are installed.

Abstract: An electric wave receiving apparatus comprises: an antenna; an amplifier; filter circuits that extract signals in different frequency bands from an output of the amplifier; detector circuits that demodulate time codes from outputs of the filter circuits; automatic gain control circuits that generate gain control signals from the detector circuits; a selector that selects one gain control signal indicating a maximum signal level among the gain control signals; and an arithmetic processing section to be able to analyze the time codes of outputs of the plurality of detector circuits, wherein the one gain control signal is supplied to the amplifier to control an amplification factor of the amplifier so that signal levels output from detector circuits do not become excessive, and the arithmetic processing section selects an output to enable the analysis of the time code among the outputs of detector circuits to perform the analysis of the time code.

Abstract: A time information receiver and radio controlled watch that receives a time code in which different data pulses are disposed one in a unit period. A composite signal waveform of a plurality of detected signals of the time code shifted sequentially by a unit period of 1 second is obtained by sample adders. A start point of each unit period is detected from the composite signal waveform as a seconds synchronization point where the receiver and watch is seconds-synchronized with the time code. An accurate seconds synchronization point is detected from the detected signal even when the same includes a considerable noise (FIG. 4).

Abstract: A standard time and frequency signal receiver receives a time code in which a plurality of data pulses “1”, “0” and “P” which are identified by width are arranged one in a respective one of unit periods of the standard signal. An amplitude of a detected signal of the time code is sampled with respect to a seconds synchronization point in a unit period. Then, correlation values F1, F0 and FP for the data pulses “P”, “1” and “0”, respectively, are calculated based on the sampled values. These correlation values F1, F0 and FP are then compared to determine the data pulse received. Even when the time code contains a considerable noise, which of the “1”, “0” and “P” signals was received is determined accurately, thereby achieving the reception of the time code with a reduced error.

Abstract: When lack of a part data on a time code included in a received standard radio wave is detected, the lack is filled up with a corresponding data part of another time code. The time of a radio-wave timepiece is corrected in accordance with the time code whose lack has been filled up.

Abstract: When lack of a part data on a time code included in a received standard radio wave is detected, the lack is filled up with a corresponding data part of another time code. The time of a radio-wave timepiece is corrected in accordance with the time code whose lack has been filled up.

Abstract: In a radio wave reception device and a radio wave clock capable of receiving multiple frequencies, an intermediate frequency signal whose frequency is fixed can be output while a signal output from a local oscillation circuit (5) is fixed.

Abstract: An SW control circuit turns ON and OFF a switch circuit provided between a reception antenna and an RF amplifier circuit, based on a noise removal control signal which is generated by a timing generation circuit and has a constant pulse width and a constant pulse interval, and thus the antenna is periodically short-circuited. In this way, even when the antenna receives a signal mixed with noise signals, accumulated energy due to the noise signals is periodically released, and thus the noise signals can be removed from the reception signal, and long lasting influence caused by the accumulated energy of the noise signals can be also removed.

Abstract: An antenna includes a rod-like core configured by an amorphous metal formed into a bulk configuration, and a coil wound around the core. An electronic device includes a case encasing the antenna, a sectional area of each longitudinal end portion of the core being larger than that of a central portion of the core. The antenna may be disposed under a radio wave permeable decorative plate in such a manner that a magnetic sheet is attached to each end portion of the core to protrude outwards from the core or that an expanded portion is disposed in each end portion and has such a shape to make a side of a surface of the expanded portion facing the decorative plate receive more radio wave than a side of a surface of the expanded portion opposite to the facing surface in relation to an axial line of the antenna.

Abstract: In an antenna device of a wristwatch, a pair of external magnetic members each attached to a respective one of both ends of a magnetic core effectively collects the magnetic flux of a standard time and frequency signal. The collected magnetic flux passes through the core around which a coil is wound, thereby inducing an electromotive force and hence improving the reception accuracy of the signal. The pair of external magnetic members screens out undesirable external magnetism which would otherwise influence motors that drive a hand shaft and hands, thereby achieving accurate hand driving and improving the high watch accuracy.