JP2002148370A - Oscillator with clock information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillator with clock information including a long-wave receiver for receiving a long-wave standard radio wave with high hour accuracy and time accuracy by obtaining clock data demodulated from a long-wave standard radio wave received by the long-wave receiver, and an oscillating signal phase-synchronized with a carrier frequency of the long-wave standard radio wave or a multiplication signal obtained by frequency-multiplying the carrier frequency as a frequency reference signal, thereby solving the problem of the conventional oscillator of the electric apparatus for generating a clock signal, wherein the oscillator does not have enough frequency accuracy, so that a clock difference is caused in the electric apparatus. SOLUTION: This synchronous oscillator with clock information is provided with a long-wave receiver for receiving and amplifying a long-wave standard radio wave, outputting a carrier signal, and demodulating and outputting a clock signal. The oscillator outputs an oscillation signal phase-synchronized with the carrier signal regenerated from the long-wave standard radio wave and the clock signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator having a function of receiving a long-wave standard radio wave.

[0002]

2. Description of the Related Art In general, a clock function has been incorporated in almost all electric devices, from home electric appliances such as personal computers and VCRs to communication devices such as mobile phones. It is well known that a current time can be displayed using a clock function, or a timer operation such as operating an electric device at a predetermined time can be performed. In order to display the current time and perform a clock function such as a timer operation, the electric device incorporates a time reference oscillator therein. This time reference oscillator oscillates at a predetermined frequency and outputs a digital signal or an analog signal whose waveform repeats every moment at a constant time. Therefore, the signal having one cycle of these signal waveforms as a unit time is integrated. Thereby, predetermined time information is generated.

[0003]

By the way, the time reference oscillator incorporated in the electric equipment has a problem that time shift occurs because the frequency accuracy is not sufficiently high. When a time difference occurs in a video deck or the like, it is necessary to adjust the displayed time by operating an operation switch or a remote control each time the time is shifted. Also, if only one VCR is used to set the time, it is troublesome, but the user may be tempted to set the time. Since most electric appliances up to the microwave oven do so, it would be impractical to set the time individually for each electric appliance. Therefore, it seems that the current state is that while the time display of electric appliances in ordinary households is off, the correct time is hardly displayed.

Further, even if the time is set once, if the date and time are repeated, the time will be shifted sometime without notice, and eventually the time will hardly be adjusted. In addition, depending on the electrical device, once the original power outlet is disconnected, all the time information is lost.Therefore, if you unplug the power of unused electrical devices from the power outlet to save power, There is also the hassle of having to reconfigure the settings frequently.

[0005] Also, while the description has been given of a general home appliance as an example, in a mobile device such as a mobile phone, for example,
In a situation where financial and commercial transactions using a mobile phone are in progress, it is useful that the mobile phone individual has accurate time information in spreading these transactions in the future. That is, in a mobile phone or the like, it is possible to generate a more accurate clock signal by synchronizing the frequency of the internal oscillator with the carrier frequency of the received radio wave. However, it is possible to generate accurate time information using only the clock signal. I can't do that.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem of time deviation caused by the frequency accuracy of the time reference oscillator. An object of the present invention is to provide an oscillator that outputs an oscillation signal with high accuracy.

[0007]

In order to solve the above-mentioned object, an oscillator according to the present invention according to claim 1 of the present invention receives and amplifies a long-wave standard radio wave, outputs a carrier signal, and outputs a time signal. An oscillator having a long-wave receiver for demodulating and outputting a time signal and an oscillation signal phase-synchronized with the carrier signal reproduced from the long-wave standard radio wave. The invention according to claim 2 of the oscillator with time information according to the present invention is characterized in that, in claim 2, when the received electric field intensity of the long-wave standard radio wave received by the long-wave receiver falls below a predetermined value, the long-wave receiver is activated. The time signal to be demodulated and output is turned off, and the oscillator interrupts the phase synchronization and outputs an oscillation signal having a predetermined oscillation frequency.

According to a third aspect of the present invention, there is provided an oscillator having a long-wave receiver for receiving and amplifying a long-wave standard radio wave, outputting a carrier signal, and demodulating and outputting a time signal. The oscillator selects and switches between an oscillation signal having a predetermined oscillation frequency and a frequency-multiplied signal obtained by frequency-multiplying the carrier signal reproduced from the long-wave standard time signal, and outputs the time signal. An oscillator with time information according to the present invention.
According to the invention described in claim 3, when the received electric field strength of the long-wave standard radio wave received by the long-wave receiver is equal to or less than a predetermined value, the time signal demodulated and output by the long-wave receiver is cut off, The oscillator is configured to select and output an oscillation signal having the predetermined oscillation frequency.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. FIG. 1 is a block diagram showing a first embodiment of an oscillator with time information according to the present invention. The oscillator with time information shown in FIG. 1 receives and amplifies a long-wave standard radio wave, reproduces and outputs a carrier, and demodulates and outputs a time signal. An oscillation signal phase-synchronized with the carrier reproduced and output by the long-wave receiver 1 As a frequency reference signal. The long wave receiver 1 includes an antenna 3 for receiving a long wave standard radio wave, and a receiving unit for amplifying the long wave standard radio wave received by the antenna 3 to output a high frequency amplified signal and detecting the high frequency amplified signal to output a detection voltage. 4, a demodulation unit 5 for demodulating and outputting a time signal from the high-frequency amplified signal, and an amplitude limiter 6 for reproducing and outputting a carrier from the high-frequency amplified signal.

Further, the synchronous oscillator 2 inputs the carrier signal output from the amplitude limiter 6 to a first input terminal and sets the phase difference between the carrier signal and a frequency-divided signal input to a second input terminal described later to 0 °. A phase comparator 7 for outputting a phase control signal, a loop filter 8 for filtering the phase control signal from the phase comparator 7 according to a predetermined cutoff frequency and outputting a phase control voltage, An A / D converter 9 for converting the phase control voltage from
A control unit 10 for storing and storing the digital signal and for turning on and off according to the detection voltage from the receiving unit 4
A D / A converter 11 that converts a digital signal input from the A / D converter 9 via the control unit 10 into an analog signal and outputs a phase control voltage, and a voltage whose oscillation frequency changes according to the phase control voltage A control crystal oscillator 12; and a frequency divider 13 that divides an oscillation signal output from the voltage control crystal oscillator 12 by a predetermined number, outputs the frequency-divided signal, and supplies the frequency-divided signal to a second input terminal of the phase comparator 7. It has. The oscillation signal of the voltage controlled crystal oscillator 12 is output as a frequency reference signal.

The operation of the first embodiment will be described in detail below. First, the modulation waveform of the long-wave standard radio wave will be briefly described. Long wave standard radio wave is 40kHz
The carrier wave of z is AM-modulated (pulse-modulated) according to a digital data sequence of 1 bit / sec. As shown in FIG. 3, digital data strings "0" and "1" of 1 bit / sec.
And "M (marker)", the pulse width of the carrier changes to 0.8 seconds, 0.5 seconds or 0.2 seconds, respectively. The time information is arranged in 60 seconds as one frame. "
Year, month, day, hour,
It is designed to express minute information. The amplitude of the modulated wave is different from normal AM modulation (pulse modulation), and the ratio between the maximum amplitude (V1) and the minimum amplitude (V2) is 10: 1. That is, the carrier wave (40 k
(Hz).

First, it is assumed that the long wave receiver 1 receives the long wave standard radio wave having the above-described characteristics. At this time, the antenna 3 supplies the received long-wave standard radio wave to the receiving unit 4 as a high-frequency signal. The receiving section 4 amplifies the high-frequency signal to a predetermined level and supplies the high-frequency signal to the demodulating section 5 as a high-frequency amplified signal. The demodulation unit 5 demodulates the high frequency amplified signal and outputs a time signal to the control unit 10. The control unit 10 extracts information on time from the time signal, converts the information into a predetermined data format, and outputs it as time data.

On the other hand, the receiving section 4 supplies the high frequency amplified signal to the amplitude limiter 6. The amplitude limiter 6 stabilizes the amplitude of the high frequency amplified signal having the waveform shown in FIG. 3 and outputs a carrier signal. The carrier signal is supplied to a first input terminal of the phase comparator 7 as a reference signal having a constant frequency of 40 kHz. The phase comparator 7 outputs a phase control signal such that the phase difference between a reference signal input to a first input terminal and a frequency-divided signal from a frequency divider 13 described later becomes 0 °, and the phase control signal Is supplied to an A / D converter 9 as a phase control voltage after being filtered by a loop filter 8.

The A / D converter 9 converts the phase control voltage into a digital signal and outputs the digital signal to the control unit 10. The digital signal is supplied to a D / A converter 11 via a control unit 10 and is returned to an analog signal, and a phase control voltage is supplied to a voltage controlled crystal oscillator 12. Voltage controlled crystal oscillator 12
The output frequency of the output signal is controlled according to the phase control voltage. The output signal of the voltage-controlled crystal oscillator 12 is fed back and frequency-divided by the frequency divider 13 before being supplied to the second input terminal of the phase comparator 7 as a frequency-divided signal.

Therefore, the phase difference between the reference signal and the frequency-divided signal input to the phase comparator 7 is 0 °,
The frequency and phase of the output signal of the voltage-controlled crystal oscillator 13 are controlled, whereby a signal of a predetermined frequency having the same frequency accuracy as the carrier signal extracted from the long-wave standard radio wave is output from the voltage-controlled crystal oscillator 13 as a frequency reference signal. can get.

Next, the operation when the long wave receiver 1 cannot receive the long wave standard radio wave will be described. As described above, the receiver 4 amplifies the long-wave standard radio wave received by the antenna 3 and outputs a high-frequency amplified signal. At the same time, the receiver 4 detects the high-frequency amplified signal and outputs a detection voltage proportional to the amplitude thereof.
0. When the detection voltage is equal to or lower than the predetermined value, the control unit 10 determines that the longwave receiver 1 cannot stably receive the longwave standard radio wave, that is, determines that the SN ratio of the received longwave standard radio wave is poor, and the A / D converter 9 To D / A converter 1
The digital signal relayed to 1 is cut off, and a predetermined digital signal is output. According to the predetermined digital signal, the frequency of the output signal of the voltage controlled crystal oscillator 12 is D
The frequency is controlled via the / A converter 11 and is fixed at a constant value. Further, the control unit 10 stops the output time data.

As described above, in a state where the long wave standard radio wave cannot be stably received, the time data is cut off, so that the time information cannot be naturally obtained. However, although the accuracy of the carrier wave frequency of the long wave standard radio wave is inferior, the predetermined accuracy is not obtained. Can be obtained. Here, the set value of the predetermined digital signal supplied from the control unit 10 when the long wave standard radio wave cannot be received is set in advance, but the set value is set during reception of the long wave standard radio wave. Then, the values are sequentially updated to the optimal values according to the procedure described below.

That is, the A / D converter 9 receives the long-wave standard radio wave and the A / D converter 9 in a state where the frequency of the output signal of the voltage controlled crystal oscillator 12 is phase-synchronized with the carrier frequency (40 kHz) of the long-wave standard radio wave. The digital signal to be output is stored and stored in the control unit 10 and is sequentially updated. In this way, even if the oscillation frequency characteristic of the voltage controlled crystal oscillator 12 alone changes due to a temperature change or an aging change, the control unit 10 sends the D / A converter 11 in accordance with the change.
Is sequentially updated to the latest set value, the phase control voltage supplied to the voltage-controlled crystal oscillator 12 is also updated to the optimal value at any time, and the output signal of the voltage-controlled crystal oscillator 12 (frequency The frequency of the reference signal) can maintain a predetermined frequency accuracy even if the state shifts from a state in which a long-wave standard radio wave is received to a state in which it is not received.

Next, a description will be given of a second embodiment of the oscillator with time information according to the present invention. FIG. 2 is a block diagram of the second embodiment. The long wave receiver 1 receives and amplifies a long wave standard radio wave, reproduces and outputs a carrier wave, and demodulates and outputs a time signal. A synchronous oscillator 14 for selectively outputting a frequency-multiplied signal of the output carrier signal and an oscillation signal having a predetermined frequency. Further, the long-wave receiver 1 includes an antenna 3 for receiving the long-wave standard radio wave, amplifies the long-wave standard radio wave received by the antenna 3, outputs a high-frequency signal, and outputs a DC voltage obtained by detecting the high-frequency signal as a detection voltage. Receiving unit 4
A demodulation unit 5 for demodulating and outputting a time signal from the high-frequency signal; and an amplitude limiter 6 for making the amplitude of the high-frequency signal constant and reproducing and outputting a carrier signal.

The synchronous oscillator 14 further includes a frequency multiplier 15 for frequency-multiplying the carrier signal output from the amplitude limiter 6 and outputting a frequency-multiplied signal having a predetermined frequency, and a local oscillator for outputting a local oscillation signal having the same frequency as the frequency-multiplied signal. An oscillator 16, a selection switch 17 for inputting and selecting and outputting the multiplied signal and the local oscillation signal, a time signal from the demodulation section 5 to output time data in a predetermined data format and output a time data from the reception section 4; And a controller 18 for processing the detection voltage and outputting a switching signal to the selection switch 17.

The operation of the second embodiment will be described in detail below. First, when the long wave receiver 1 receives the long wave standard wave, the antenna 3 supplies the received long wave standard wave to the receiver 4 as a high frequency signal. The receiving section 4 amplifies the high-frequency signal to a predetermined level and supplies the high-frequency signal to the demodulating section 5 as a high-frequency amplified signal. The double tone section 5 demodulates the high frequency amplified signal and outputs a time signal to the control section 18.
The control unit 18 extracts information on the time from the time signal, converts the information into a predetermined data format, and outputs it as time data.

On the other hand, the receiving section 4 supplies the high frequency amplified signal to the amplitude limiter 6. The amplitude limiter 6 is an amplifier shown in FIG.
The amplitude of the high-frequency amplified signal having the modulated waveform is made constant to output a carrier signal. The carrier signal has a frequency of 4
It is input to the multiplier 15 as a reference signal fixed at 0 kHz. The multiplier 15 multiplies the frequency of the reference signal and outputs a multiplied signal of a predetermined frequency to a first input terminal of the selection switch 17. A local input signal of the same frequency as the multiplied signal is supplied to a second input terminal of the selection switch 17.
Supplied from

Here, the control unit 18 monitors the detected voltage from the receiving unit 4. If the detected voltage exceeds a predetermined value, the long wave receiver 1 stably receives the long standard wave. That is, it is determined that the SN ratio of the received standard long wave is sufficiently high, and the switching signal is supplied to the selection switch 17. The selection switch 17 selectively outputs the multiplied signal supplied to the first input terminal according to the switching signal. When the detection voltage supplied from the receiving unit 4 becomes equal to or less than a predetermined value, the control unit 18 cannot stably receive the long-wave standard radio wave, that is, if the SN ratio of the received long-wave standard radio wave is low. Is determined, the output time data is turned off, and a switching signal is output to the selection switch 17. The selection switch 17 selectively outputs the local oscillation signal supplied to the second input terminal according to the switching signal.

As described above, depending on whether or not the long wave receiver 1 is receiving the long wave standard radio wave stably, the output of the time data is turned on and off, and the multiplied signal and the local oscillation signal are selected as the frequency reference signal. Since it can be output, when the longwave standard time signal is received stably, a multiplied signal having the same frequency accuracy as the carrier frequency of the longwave standard time signal can be obtained together with the time data as a frequency reference signal,
Even when the long-wave standard radio wave cannot be stably received, a local oscillation signal having a predetermined frequency accuracy can be obtained as a frequency reference signal although time data cannot be obtained.

In the above-described embodiment, it is assumed that the long-wave standard radio wave is transmitted from a base station installed at Otakatoriyama mountain (Otakadoyama: 794 m above sea level) in Fukushima prefecture. A new base station is scheduled to be opened in Kyushu in October, and after the start of operation, it will be possible to receive reception services in almost all of Japan by operating two waves with existing stations.

However, the carrier frequency of the long-wave standard radio wave scheduled to be opened in Kyushu is 60 kHz, which is different from that of the existing station of 40 kHz. In view of the above, the present invention proposes a synchronous oscillator with time information that can be used for both existing stations and scheduled stations.

FIG. 4 is a block diagram showing a third embodiment of the synchronous oscillator with time information according to the present invention.
The third embodiment shown in FIG. 4 has a configuration including a long-wave receiver 1 and a synchronous oscillator 2, similarly to the first embodiment shown in FIG. The long-wave receiver 1 includes an antenna 3 for receiving the long-wave standard radio wave, a band-pass filter 19 and a band-pass filter 20 for selecting the long-wave standard radio wave received by the antenna 3, and the band-pass filter 19 and the band-pass filter 20. , An amplifier 21 and an amplifier 22 for respectively amplifying the selected signal, and a detection comparator for detecting the signals amplified by the amplifiers 21 and 22, respectively, outputting a detection voltage, and generating a switching signal and a frequency division control signal. 23, a switching unit 24 for selectively outputting an amplified signal supplied from each of the amplifiers 21 and 22 according to the switching signal, and a demodulation unit 5 for demodulating the amplified signal supplied from the switching unit 24 and outputting a time signal. And an amplitude limiter 6 for reproducing and outputting a carrier signal (reference signal) of the amplified signal. The synchronous oscillator 2 has a configuration in which a variable frequency divider 25 is added to the first embodiment shown in FIG.

The third embodiment of the synchronous oscillator with time information shown in FIG. 4 operates as follows. That is, the antenna 3 supplies the received long-wave standard radio wave to the band-pass filters 19 and 20. If the received standard radio wave is that of an existing station (Fukushima), the bandpass filter 19 having a center frequency of 40 kHz selects this and supplies it to the amplifier 21. If the received longwave standard time signal is that of the station to be opened (Kyushu), the center frequency 60
The kHz band-pass filter 20 selects this and the amplifier 2
Feed to 2. On the other hand, when both the existing station and the station to be opened receive radio waves, the band-pass filters 19 and 20 both select a signal and supply it to the amplifiers 21 and 22.

Therefore, the description will be continued below assuming that two waves of the existing station and the station to be opened are simultaneously received. The amplifier 21 and the amplifier 22 supply the amplified signal to the detection comparison unit 23 and the switching unit 24, respectively. The detection comparator 23 detects the two amplified signals to generate a detection voltage, compares the two signals, and selects and outputs one of the detection voltages corresponding to the signal having the higher signal strength of the amplified signal. Further, the detection comparing section 23 compares the two generated detection voltages and outputs a switching control signal and a frequency division control signal.

The switching section 24 selects and outputs one of the amplified signals supplied from the amplifiers 21 and 22 having a higher signal strength in accordance with the switching control signal. Then, the demodulation unit 5 and the amplitude limiter 6 process this, and output a time signal and a carrier signal (reference signal), respectively. Then, the time signal is processed by the control unit 2 of the synchronous oscillator 1 and output as time data. Further, the carrier signal (reference signal) and the frequency division control signal are supplied to the variable frequency divider 25. The variable frequency divider 2 divides the frequency of the reference signal by a predetermined number according to the frequency division control signal and supplies it to the phase comparator 25. Here, the variable frequency divider 2
The frequency division ratio of 5 is set so that the frequency division ratio is either 2 or 3 in accordance with the frequency division control signal generated by the detection comparison section 23.

That is, when the amplified signal selected by the switching unit 24 is that of an existing station, the frequency division ratio is set to 2 and the output frequency of the variable frequency divider 25 is set to 40 kHz / 2 = 20 kHz.
And On the other hand, when the amplified signal selected by the switching unit 24 is a station to be opened, the frequency division ratio is set to 3 and the variable frequency divider 25 is set.
Is set to 60 kHz / 3 = 20 kHz. In this case, the variable frequency divider 25 is connected to the phase comparator 2
5 can be constant at 20 kHz,
What is phase-locked to this signal is the voltage-controlled crystal oscillator 12
From the output of Here, the operation of the phase synchronization is the same as that described in the first embodiment shown in FIG.

Note that the variable frequency divider 25 is omitted and the frequency
A reference signal of about 60 kHz to 60 kHz may be supplied directly to the phase comparator 7. In this case, the oscillation output frequency fo of the voltage controlled crystal oscillator 25 obtained as a frequency reference signal
In order to prevent ut from changing with the frequency of the reference signal, the frequency divider 13 is of a variable frequency divider type capable of controlling the frequency division ratio N, and fout = 60 kHz × N1 = 40 k
The frequency division ratio N of the frequency divider 13 may be set to either N1 or N2 so that Hz × N2.

FIG. 5 is a block diagram showing a fourth embodiment of the synchronous oscillator with time information according to the present invention.
The fourth embodiment shown in FIG. 5 has a configuration including a long-wave receiver 1 and a synchronous oscillator 2, similarly to the second embodiment shown in FIG. The long wave receiver 1 is exactly the same as that shown in FIG. 4, and the synchronous oscillator 2 is obtained by replacing the multiplier 15 shown in FIG.

With this configuration, the reference signal output from the long-wave receiver 1 is input to the variable multiplier 26, and the frequency division control signal output from the detection comparator 23 is shared as a multiplication control signal. If the frequency multiplier of the variable multiplier 26 is switched and controlled in accordance with the frequency of the signal, the variable multiplier 26 is kept constant through the output of the selection switch 17 regardless of whether the frequency of the reference signal is 40 kHz or 60 kHz. A frequency reference signal of the frequency can be provided.

For the standard long wave, the existing station 4
Although the configuration assumes two-wave operation of 0 kHz and the scheduled station to be opened to 60 kHz, the present embodiment is not limited to this.
Assuming that operation of three or more waves will be required in the future, an additional space may be provided in the long-wave receiver 1 so that a band-pass filter and an amplifier can be added as needed. . 4 and 5, the longer wave standard radio wave received by the long wave receiver 1 is selected and output from the longer wave standard wave, whichever is stronger. Assuming a case where it is possible, it may be possible to manually set such that only one of them can be selectively received.

By incorporating the above-described oscillator with time information according to the present invention into an electric device, time information can always be supplied to the electric device and a high-precision oscillation signal can be supplied. Will be. Further, even if the power of the electric device is once disconnected from the outlet for power saving, the time information is supplied to the electric device when the power is turned on again, so that the time resetting becomes unnecessary, and its utility value is high.

[0037]

As described above, the present invention relates to an oscillator with time information provided with a long wave receiver, wherein the oscillator has a long wave receiver for receiving a long wave standard wave and demodulating and outputting time information. An oscillation signal or a frequency-multiplied signal obtained by frequency-multiplying the carrier signal output from the receiver can be output together with the time information as a frequency reference signal as a frequency reference signal. It is very effective in providing oscillators.

[0038]

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a modulation waveform of a long-wave standard radio wave.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

FIG. 5 is a block diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Long-wave receiver 2 ... Synchronous oscillator 3 ... Antenna 4 ... Receiving part 5 ... Demodulation part 6 ... Amplitude limiter 7 ... Phase comparator 8 ... Loop filter Reference Signs List 9 A / D converter 10 Control part 11 D / A converter 12 Voltage controlled crystal oscillator 13 Frequency divider 14 Synchronous oscillator 15 Multiplication Unit 16 ... Local oscillator 17 ... Selection switch 18 ... Control unit 19,20 ... Bandpass filter 21,22 ... Amplifier 23 ... Detection comparison unit 24 ... Switching unit 25. ..Variable frequency divider 26 ... Variable frequency multiplier

Claims (4)

[Claims] An oscillator comprising a long-wave receiver for receiving and amplifying a long-wave standard radio wave, outputting a carrier signal, and demodulating and outputting a time signal, wherein the oscillator is configured to phase-shift the carrier signal reproduced from the long-wave standard radio wave. An oscillator with time information, which outputs a synchronized oscillation signal and the time signal. 2. When the received electric field strength of the long-wave standard radio wave received by the long-wave receiver becomes equal to or less than a predetermined value, the time signal demodulated and output by the long-wave receiver is cut off, and the oscillator is controlled by the phase control. 2. The oscillator with time information according to claim 1, wherein the synchronization is interrupted to output an oscillation signal of a predetermined oscillation frequency. 3. An oscillator comprising a long-wave receiver for receiving and amplifying a long-wave standard radio wave, outputting a carrier signal, and demodulating and outputting a time signal, wherein the oscillator includes an oscillation signal having a predetermined oscillation frequency and the long-wave standard radio wave. An oscillator with time information, wherein the time signal is output while selecting and switching a frequency-multiplied signal obtained by frequency-multiplying the carrier signal reproduced from the signal. 4. When the received electric field strength of the long-wave standard radio wave received by the long-wave receiver becomes equal to or less than a predetermined value, the time signal demodulated and output by the long-wave receiver is turned off, and the oscillator is controlled by the predetermined signal. 4. The oscillator with time information according to claim 3, wherein an oscillation signal having an oscillation frequency of (i) is selected and output.